binding system refactoring - work in progress

org.springframework.context/src/main/java/org/springframework/ui/binding/Binder.java

@@ -21,7 +21,7 @@ import java.util.Map;
  * Binds user-entered values to properties of a model object.
  * @author Keith Donald
  * @since 3.0
- * @see #addBinding(String)
+ * @see #bind(String)
  * @see #getBinding(String)
  * @see #bind(Map)
  */
@@ -32,26 +32,6 @@ public interface Binder {
 	 */
 	Object getModel();
 
-	/**
-	 * Add a binding to a model property.
-	 * The property may be a path to a member property like "name", or a nested property like "address.city" or "addresses.city".
-	 * If the property path is nested and traverses a collection or Map, do not use indexes.
-	 * The property path should express the model-class property structure like addresses.city, not an object structure like addresses[0].city.
-	 * Examples:
-	 * <pre>
-	 * name - bind to property 'name'
-	 * addresses - bind to property 'addresses', presumably a List&lt;Address&gt; e.g. allowing property expressions like addresses={ 12345 Macy Lane, 1977 Bel Aire Estates } and addresses[0]=12345 Macy Lane
-	 * addresses.city - bind to property 'addresses.city', for all indexed addresses in the collection e.g. allowing property expressions like addresses[0].city=Melbourne
-	 * address.city - bind to property 'address.city'
-	 * favoriteFoodByFoodGroup - bind to property 'favoriteFoodByFoodGroup', presumably a Map<FoodGroup, Food>; e.g. allowing favoriteFoodByFoodGroup={ DAIRY=Milk, MEAT=Steak } and favoriteFoodByFoodGroup['DAIRY']=Milk
-	 * favoriteFoodByFoodGroup.name - bind to property 'favoriteFoodByFoodGroup.name', for all keyed Foods in the map; e.g. allowing favoriteFoodByFoodGroup['DAIRY'].name=Milk
-	 * </pre>
-	 * @param propertyPath the model property path
-	 * @return a BindingConfiguration object, allowing additional configuration of the newly added binding
-	 * @throws IllegalArgumentException if no such property path exists on the model
-	 */
-	public BindingConfiguration addBinding(String propertyPath);
-	
 	/**
 	 * Get a binding to a model property..
 	 * @param property the property path

org.springframework.context/src/main/java/org/springframework/ui/binding/Binding.java

@@ -15,59 +15,128 @@
  */
 package org.springframework.ui.binding;
 
+import org.springframework.ui.alert.Alert;
+
 /**
- * A binding between a user interface element and a model property.
+ * A binding between a source element and a model property.
  * @author Keith Donald
  * @since 3.0
  */
 public interface Binding {
 
 	/**
-	 * The name of the bound model property.
+	 * The bound value to display in the UI.
+	 * Is the formatted model value if not dirty.
+	 * Is the buffered value if dirty.
 	 */
-	String getProperty();
+	Object getValue();
 
 	/**
-	 * The type of the underlying property associated with this binding.
+	 * If this Binding is read-only.
+	 * A read-only Binding cannot have source values applied and cannot be committed.
 	 */
-	Class<?> getType();
-
-	/**
-	 * The formatted property value to display in the user interface.
-	 */
-	String getValue();
-
-	/**
-	 * Set the property to the value provided.
-	 * The value may be a formatted String, a formatted String[] if a collection binding, or an Object of a type that can be coersed to the underlying property type.
-	 * @param value the new value to bind
-	 * @return a summary of the result of the binding
-	 * @throws BindException if an unrecoverable exception occurs 
-	 */
-	BindingResult setValue(Object value);
+	boolean isReadOnly();
 	
 	/**
-	 * Formats a candidate model property value for display in the user interface.
-	 * @param potentialValue a possible value
-	 * @return the formatted value to display in the user interface
+	 * Apply the source value to this binding.
+	 * The source value is parsed, validated, and stored in the binding's value buffer.
+	 * Sets 'dirty' status to true.
+	 * Sets 'valid' status to false if the source value is not valid.
+	 * @param sourceValue
+	 * @throws IllegalStateException if read only
 	 */
-	String format(Object potentialValue);
+	void applySourceValue(Object sourceValue);
+	
+	/**
+	 * True if there is an uncommitted value in the binding buffer.
+	 * Set to true after applying a source value.
+	 * Set to false after a commit.
+	 */
+	boolean isDirty();
+	
+	/**
+	 * False if dirty and the buffered value is invalid.
+	 * False if dirty and the buffered value appears valid but could not be committed.
+	 * True otherwise.
+	 */
+	boolean isValid();
+	
+	/**
+	 * Commit the buffered value to the model.
+	 * @throws IllegalStateException if not dirty, not valid, or read-only
+	 */
+	void commit();
 
 	/**
-	 * Is this a collection binding?
-	 * If so, a client may call {@link #getCollectionValues()} to get the collection element values for display in the user interface.
-	 * In this case, the client typically allocates one indexed field to each value.
-	 * A client may then call {@link #setValues(String[])} to update model property values from those fields.
-	 * Alternatively, a client may call {@link #getValue()} to render the collection as a single value for display in a single field, such as a large text area.
-	 * The client would then call {@link #setValue(Object)} to update that single value from the field.
+	 * An Alert that communicates the current status of this Binding.
 	 */
-	boolean isCollection();
+	Alert getStatusAlert();
+	
+	/**
+	 * Access raw model values.
+	 */
+	Model getModel();
+	
+	/**
+	 * Get a Binding to a nested property value.
+	 * @param nestedProperty the nested property name, such as "foo"; should not be a property path like "foo.bar"
+	 * @return the binding to the nested property
+	 */
+	Binding getBinding(String nestedProperty);
 
 	/**
-	 * When a collection binding, the formatted values to display in the user interface.
-	 * If not a collection binding, throws an IllegalStateException.
-	 * @throws IllegalStateException
+	 * If bound to an indexable Collection, either a {@link java.util.List} or an array.
 	 */
-	String[] getCollectionValues();
+	boolean isIndexable();
 
+	/**
+	 * If a List, get a Binding to a element in the List.
+	 * @param index the element index
+	 * @return the indexed binding
+	 */
+	Binding getIndexedBinding(int index);
+
+	/**
+	 * If bound to a {@link java.util.Map}.
+	 */
+	boolean isMap();
+
+	/**
+	 * If a Map, get a Binding to a value in the Map.
+	 * @param key the map key
+	 * @return the keyed binding
+	 */
+	Binding getKeyedBinding(Object key);
+
+	/**
+	 * Format a potential model value for display.
+	 * If an indexable binding, expects the model value to be a potential collection element & uses the configured element formatter.
+	 * If a map binding, expects the model value to be a potential map value & uses the configured map value formatter.
+	 * @param potentialValue the potential value
+	 * @return the formatted string
+	 */
+	String formatValue(Object potentialModelValue);
+	
+	/**
+	 * For accessing the raw bound model object.
+	 * @author Keith Donald
+	 */
+	public interface Model {
+		
+		/**
+		 * Read the raw model value.
+		 */
+		Object getValue();
+		
+		/**
+		 * The model value type.
+		 */
+		Class<?> getValueType();		
+
+		/**
+		 * Set the model value.
+		 * @throws IllegalStateException if this binding is read-only
+		 */
+		void setValue(Object value);
+	}
 }

org.springframework.context/src/main/java/org/springframework/ui/binding/config/BindingRule.java

@@ -0,0 +1,19 @@
+package org.springframework.ui.binding.config;
+
+import org.springframework.ui.format.Formatter;
+
+public interface BindingRule {
+	
+	String getPropertyPath();
+	
+	Formatter<?> getFormatter();
+	
+	boolean isRequired();
+	
+	boolean isCollectionBinding();
+
+	Formatter<?> getKeyFormatter();
+
+	Formatter<?> getValueFormatter();
+	
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/config/BindingRuleConfiguration.java

@@ -13,25 +13,29 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.ui.binding;
+package org.springframework.ui.binding.config;
 
-import org.springframework.ui.binding.support.GenericBinder;
 import org.springframework.ui.format.Formatter;
 
 /**
  * A fluent interface for configuring a newly added binding.
  * @author Keith Donald
- * @see GenericBinder#addBinding(String)
  */
-public interface BindingConfiguration {
+public interface BindingRuleConfiguration {
 	
 	/**
 	 * Set the Formatter to use to format bound property values.
-	 * If a collection property, the formatter is used to format collection element values.
+	 * If a collection property, this formatter is used to format the Collection as a String.
 	 * Default is null.
 	 */
-	BindingConfiguration formatWith(Formatter<?> formatter);
+	BindingRuleConfiguration formatWith(Formatter<?> formatter);
 
+	/**
+	 * If a collection property, set the Formatter to use to format indexed collection elements.
+	 * Default is null.
+	 */
+	BindingRuleConfiguration formatElementsWith(Formatter<?> formatter);
+	
 	/**
 	 * Mark the binding as required.
 	 * A required binding will generate an exception if no sourceValue is provided to a bind invocation.
@@ -44,5 +48,6 @@ public interface BindingConfiguration {
 	 * addresses.city=required - will generate an exception if 'addresses[n].city' is not present in the source values map, for every address[n].
 	 * </pre>
 	 */
-	BindingConfiguration required();
+	BindingRuleConfiguration required();
+
 }

org.springframework.context/src/main/java/org/springframework/ui/binding/config/BindingRules.java

@@ -0,0 +1,9 @@
+package org.springframework.ui.binding.config;
+
+import java.util.List;
+
+public interface BindingRules extends List<BindingRule> {
+
+	Class<?> getModelType();
+
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/config/BindingRulesBuilder.java

@@ -0,0 +1,120 @@
+package org.springframework.ui.binding.config;
+
+import java.beans.BeanInfo;
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+
+import org.springframework.core.GenericCollectionTypeResolver;
+import org.springframework.util.Assert;
+
+/**
+ * Builder for constructing the rules for binding to a model.
+ * @author Keith Donald
+ * @param <M> the model type
+ */
+public class BindingRulesBuilder {
+
+	private BindingRules bindingRules;
+	
+	/**
+	 * Creates a new BindingRuleBuilder.
+	 * @param modelType the type of model to build binding rules against
+	 */
+	public BindingRulesBuilder(Class<?> modelType) {
+		Assert.notNull(modelType, "The model type is required");
+		bindingRules = new ArrayListBindingRules(modelType);
+	}
+
+	/**
+	 * Creates a rule for binding to the model property.
+	 * @param propertyPath the model property path
+	 * @return allows additional binding configuration options to be specified fluently
+	 * @throws IllegalArgumentException if the property path is invalid given the modelType
+	 */
+	public BindingRuleConfiguration bind(String propertyPath) {
+		boolean collectionBinding = validate(propertyPath);
+		ConfigurableBindingRule rule = new ConfigurableBindingRule(propertyPath);
+		if (collectionBinding) {
+			rule.markCollectionBinding();
+		}
+		bindingRules.add(rule);
+		return rule;
+	}
+	
+	/**
+	 * The built list of binding rules.
+	 * Call after recording {@link #bind(String)} instructions.
+	 */
+	public BindingRules getBindingRules() {
+		return bindingRules;
+	}
+	
+	private boolean validate(String propertyPath) {
+		boolean collectionBinding = false;
+		String[] props = propertyPath.split("\\.");
+		if (props.length == 0) {
+			props = new String[] { propertyPath };
+		}
+		Class<?> modelType = bindingRules.getModelType();
+		for (int i = 0; i < props.length; i ++) {
+			String prop = props[i];
+			PropertyDescriptor[] propDescs = getBeanInfo(modelType).getPropertyDescriptors();
+			boolean found = false;
+			for (PropertyDescriptor propDesc : propDescs) {
+				if (prop.equals(propDesc.getName())) {
+					found = true;
+					Class<?> propertyType = propDesc.getPropertyType();
+					if (Collection.class.isAssignableFrom(propertyType)) {
+						modelType = GenericCollectionTypeResolver.getCollectionReturnType(propDesc.getReadMethod());
+						if (i == (props.length - 1)) {
+							collectionBinding = true;
+						}
+					} else if (Map.class.isAssignableFrom(propertyType)) {
+						modelType = GenericCollectionTypeResolver.getMapValueReturnType(propDesc.getReadMethod());
+						if (i == (props.length - 1)) {
+							collectionBinding = true;
+						}
+					} else {
+						modelType = propertyType;
+					}
+					break;
+				}
+			}
+			if (!found) {
+				if (props.length > 1) {
+					throw new IllegalArgumentException("No property named '" + prop + "' found on model class [" + modelType.getName() + "] as part of property path '" + propertyPath + "'");
+				} else {
+					throw new IllegalArgumentException("No property named '" + prop + "' found on model class [" + modelType.getName() + "]");					
+				}
+			}
+		}
+		return collectionBinding;
+	}
+	
+	private BeanInfo getBeanInfo(Class<?> clazz) {
+		try {
+			return Introspector.getBeanInfo(clazz);
+		} catch (IntrospectionException e) {
+			throw new IllegalStateException("Unable to introspect model type " + clazz);
+		}
+	}
+	
+	@SuppressWarnings("serial")
+	static class ArrayListBindingRules extends ArrayList<BindingRule> implements BindingRules {
+
+		private Class<?> modelType;
+		
+		public ArrayListBindingRules(Class<?> modelType) {
+			this.modelType = modelType;
+		}
+
+		public Class<?> getModelType() {
+			return modelType;
+		}
+		
+	}
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/config/ConfigurableBindingRule.java

@@ -0,0 +1,68 @@
+package org.springframework.ui.binding.config;
+
+import org.springframework.ui.format.Formatter;
+
+public class ConfigurableBindingRule implements BindingRuleConfiguration, BindingRule {
+	
+	private String propertyPath;
+	
+	private Formatter<?> formatter;
+	
+	private boolean required;
+
+	private boolean collectionBinding;
+	
+	private Formatter<?> elementFormatter;
+	
+	public ConfigurableBindingRule(String propertyPath) {
+		this.propertyPath = propertyPath;
+	}
+
+	// implementing BindingRuleConfiguration
+	
+	public BindingRuleConfiguration formatWith(Formatter<?> formatter) {
+		this.formatter = formatter;
+		return this;
+	}
+
+	public BindingRuleConfiguration required() {
+		this.required = true;
+		return this;
+	}
+	
+	public BindingRuleConfiguration formatElementsWith(Formatter<?> formatter) {
+		this.elementFormatter = formatter;
+		return this;
+	}
+
+	// implementing BindingRule
+	
+	public String getPropertyPath() {
+		return propertyPath;
+	}
+
+	public Formatter<?> getFormatter() {
+		return formatter;
+	}
+
+	public boolean isRequired() {
+		return required;
+	}	
+	
+	public boolean isCollectionBinding() {
+		return collectionBinding;
+	}
+	
+	public void markCollectionBinding() {
+		this.collectionBinding = true;
+	}
+
+	public Formatter<?> getValueFormatter() {
+		return elementFormatter;
+	}
+
+	public Formatter<?> getKeyFormatter() {
+		return null;
+	}	
+
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/ArrayListBindingResults.java

@@ -0,0 +1,76 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.springframework.ui.binding.BindingResult;
+import org.springframework.ui.binding.BindingResults;
+
+class ArrayListBindingResults implements BindingResults {
+
+	private List<BindingResult> results;
+
+	public ArrayListBindingResults() {
+		results = new ArrayList<BindingResult>();
+	}
+
+	public ArrayListBindingResults(int size) {
+		results = new ArrayList<BindingResult>(size);
+	}
+
+	public void add(BindingResult result) {
+		results.add(result);
+	}
+
+	// implementing Iterable
+
+	public Iterator<BindingResult> iterator() {
+		return results.iterator();
+	}
+
+	// implementing BindingResults
+
+	public BindingResults successes() {
+		ArrayListBindingResults results = new ArrayListBindingResults();
+		for (BindingResult result : this) {
+			if (!result.isFailure()) {
+				results.add(result);
+			}
+		}
+		return results;
+	}
+
+	public BindingResults failures() {
+		ArrayListBindingResults results = new ArrayListBindingResults();
+		for (BindingResult result : this) {
+			if (result.isFailure()) {
+				results.add(result);
+			}
+		}
+		return results;
+	}
+
+	public BindingResult get(int index) {
+		return results.get(index);
+	}
+
+	public List<String> properties() {
+		List<String> properties = new ArrayList<String>(results.size());
+		for (BindingResult result : this) {
+			properties.add(result.getProperty());
+		}
+		return properties;
+	}
+
+	public int size() {
+		return results.size();
+	}
+
+	public String toString() {
+		return "[BindingResults = " + results.toString() + "]";
+	}
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/BindingStatusResult.java

@@ -0,0 +1,40 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import org.springframework.ui.alert.Alert;
+import org.springframework.ui.alert.Severity;
+import org.springframework.ui.binding.BindingResult;
+
+class BindingStatusResult implements BindingResult {
+
+	private String property;
+	
+	private Object sourceValue;
+
+	private Alert bindingStatusAlert;
+	
+	public BindingStatusResult(String property, Object sourceValue, Alert alert) {
+		this.property = property;
+		this.sourceValue = sourceValue;
+		this.bindingStatusAlert = alert;
+	}
+
+	public String getProperty() {
+		return property;
+	}
+
+	public Object getSourceValue() {
+		return sourceValue;
+	}
+
+	public boolean isFailure() {
+		return bindingStatusAlert.getSeverity().compareTo(Severity.INFO) > 1;
+	}
+	
+	public Alert getAlert() {
+		return bindingStatusAlert;
+	}
+	
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/CollectionTypeDescriptor.java

@@ -0,0 +1,50 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import org.springframework.util.ObjectUtils;
+
+public class CollectionTypeDescriptor {
+
+	private Class<?> collectionType;
+
+	private Class<?> elementType;
+
+	/**
+	 * Creates a new generic collection property type
+	 * @param collectionType the collection type
+	 * @param elementType the element type
+	 */
+	public CollectionTypeDescriptor(Class<?> collectionType, Class<?> elementType) {
+		this.collectionType = collectionType;
+		this.elementType = elementType;
+	}
+
+	/**
+	 * The collection type.
+	 */
+	public Class<?> getCollectionType() {
+		return collectionType;
+	}
+
+	/**
+	 * The element type.
+	 */
+	public Class<?> getElementType() {
+		return elementType;
+	}
+
+	public boolean equals(Object o) {
+		if (!(o instanceof CollectionTypeDescriptor)) {
+			return false;
+		}
+		CollectionTypeDescriptor type = (CollectionTypeDescriptor) o;
+		return collectionType.equals(type.collectionType)
+				&& ObjectUtils.nullSafeEquals(elementType, type.elementType);
+	}
+
+	public int hashCode() {
+		return collectionType.hashCode() + elementType.hashCode();
+	}
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/DefaultBindingConfiguration.java

@@ -1,62 +0,0 @@
-/*
- * Copyright 2004-2009 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.ui.binding.support;
-
-import org.springframework.ui.binding.BindingConfiguration;
-import org.springframework.ui.format.Formatter;
-
-final class DefaultBindingConfiguration implements BindingConfiguration {
-	
-	private String propertyPath;
-	
-	private Formatter<?> formatter;
-	
-	private boolean required;
-	
-	/**
-	 * Creates a new Binding configuration.
-	 * @param property the property to bind to
-	 * @param formatter the formatter to use to format property values
-	 */
-	public DefaultBindingConfiguration(String propertyPath) {
-		this.propertyPath = propertyPath;
-	}
-
-	// implementing BindingConfiguration
-	
-	public BindingConfiguration formatWith(Formatter<?> formatter) {
-		this.formatter = formatter;
-		return this;
-	}
-
-	public BindingConfiguration required() {
-		this.required = true;
-		return this;
-	}
-
-	public String getPropertyPath() {
-		return propertyPath;
-	}
-
-	public Formatter<?> getFormatter() {
-		return formatter;
-	}
-
-	public boolean isRequired() {
-		return required;
-	}	
-	
-}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/DefaultFormatter.java

@@ -0,0 +1,30 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import java.text.ParseException;
+import java.util.Locale;
+
+import org.springframework.ui.format.Formatter;
+
+class DefaultFormatter implements Formatter<Object> {
+
+	public static final Formatter<Object> INSTANCE = new DefaultFormatter();
+
+	public String format(Object object, Locale locale) {
+		if (object == null) {
+			return "";
+		} else {
+			return object.toString();
+		}
+	}
+
+	public Object parse(String formatted, Locale locale) throws ParseException {
+		if (formatted == "") {
+			return null;
+		} else {
+			return formatted;
+		}
+	}
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/GenericBinder.java

@@ -15,86 +15,34 @@
  */
 package org.springframework.ui.binding.support;
 
-import java.lang.reflect.Array;
-import java.lang.reflect.ParameterizedType;
-import java.lang.reflect.Type;
-import java.lang.reflect.TypeVariable;
-import java.text.ParseException;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Iterator;
-import java.util.LinkedHashSet;
-import java.util.List;
-import java.util.Locale;
+import java.util.HashMap;
 import java.util.Map;
-import java.util.Set;
 
-import org.springframework.context.ApplicationListener;
 import org.springframework.context.MessageSource;
-import org.springframework.context.expression.MapAccessor;
-import org.springframework.context.i18n.LocaleContextHolder;
-import org.springframework.core.GenericTypeResolver;
-import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.convert.TypeConverter;
-import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.support.DefaultTypeConverter;
-import org.springframework.core.style.StylerUtils;
-import org.springframework.expression.AccessException;
-import org.springframework.expression.EvaluationContext;
-import org.springframework.expression.EvaluationException;
-import org.springframework.expression.Expression;
-import org.springframework.expression.ExpressionException;
-import org.springframework.expression.ExpressionParser;
-import org.springframework.expression.spel.SpelEvaluationException;
-import org.springframework.expression.spel.SpelMessage;
-import org.springframework.expression.spel.standard.SpelExpressionParser;
-import org.springframework.expression.spel.standard.SpelExpressionParserConfiguration;
-import org.springframework.expression.spel.support.StandardEvaluationContext;
-import org.springframework.expression.spel.support.StandardTypeConverter;
-import org.springframework.ui.alert.Alert;
-import org.springframework.ui.alert.Severity;
 import org.springframework.ui.binding.Binder;
 import org.springframework.ui.binding.Binding;
-import org.springframework.ui.binding.BindingConfiguration;
 import org.springframework.ui.binding.BindingResult;
 import org.springframework.ui.binding.BindingResults;
-import org.springframework.ui.binding.MissingSourceValuesException;
-import org.springframework.ui.binding.NoSuchBindingException;
-import org.springframework.ui.format.AnnotationFormatterFactory;
-import org.springframework.ui.format.Formatter;
-import org.springframework.ui.message.MessageBuilder;
-import org.springframework.ui.message.ResolvableArgument;
 import org.springframework.util.Assert;
 
 /**
  * A generic {@link Binder binder} suitable for use in most environments.
  * @author Keith Donald
  * @since 3.0
- * @see #addBinding(String)
- * @see #registerFormatter(Class, Formatter)
- * @see #registerFormatterFactory(AnnotationFormatterFactory)
- * @see #setFormatterRegistry(FormatterRegistry)
  * @see #setMessageSource(MessageSource)
  * @see #setTypeConverter(TypeConverter)
  * @see #bind(Map)
  */
-@SuppressWarnings("unchecked")
 public class GenericBinder implements Binder {
 
-	private static final String[] EMPTY_STRING_ARRAY = new String[0];
-
 	private Object model;
 
-	public Set<BindingFactory> bindingFactories;
-
-	private FormatterRegistry formatterRegistry = new GenericFormatterRegistry();
-
-	private ExpressionParser expressionParser;
+	private Map<String, Binding> bindings;
 
 	private TypeConverter typeConverter;
 
-	private static Formatter defaultFormatter = new DefaultFormatter();
-
 	private MessageSource messageSource;
 
 	/**
@@ -104,78 +52,10 @@ public class GenericBinder implements Binder {
 	public GenericBinder(Object model) {
 		Assert.notNull(model, "The model to bind to is required");
 		this.model = model;
-		bindingFactories = new LinkedHashSet<BindingFactory>();
-		int parserConfig = SpelExpressionParserConfiguration.CreateObjectIfAttemptToReferenceNull
-				| SpelExpressionParserConfiguration.GrowListsOnIndexBeyondSize;
-		expressionParser = new SpelExpressionParser(parserConfig);
+		bindings = new HashMap<String, Binding>();
 		typeConverter = new DefaultTypeConverter();
 	}
 
-	/**
-	 * Add a binding to a model property.
-	 * The property may be a path to a member property like "name", or a nested property like "address.city" or "addresses.city".
-	 * If the property path is nested and traverses a collection or Map, do not use indexes.
-	 * The property path should express the model-class property structure like addresses.city, not an object structure like addresses[0].city.
-	 * Examples:
-	 * <pre>
-	 * name - bind to property 'name'
-	 * addresses - bind to property 'addresses', presumably a List&lt;Address&gt; e.g. allowing property expressions like addresses={ 12345 Macy Lane, 1977 Bel Aire Estates } and addresses[0]=12345 Macy Lane
-	 * addresses.city - bind to property 'addresses.city', for all indexed addresses in the collection e.g. allowing property expressions like addresses[0].city=Melbourne
-	 * address.city - bind to property 'address.city'
-	 * favoriteFoodByFoodGroup - bind to property 'favoriteFoodByFoodGroup', presumably a Map<FoodGroup, Food>; e.g. allowing favoriteFoodByFoodGroup={ DAIRY=Milk, MEAT=Steak } and favoriteFoodByFoodGroup['DAIRY']=Milk
-	 * favoriteFoodByFoodGroup.name - bind to property 'favoriteFoodByFoodGroup.name', for all keyed Foods in the map; e.g. allowing favoriteFoodByFoodGroup['DAIRY'].name=Milk
-	 * </pre>
-	 * @param propertyPath the model property path
-	 * @return a BindingConfiguration object, allowing additional configuration of the newly added binding
-	 * @throws IllegalArgumentException if no such property path exists on the model
-	 */
-	public BindingConfiguration addBinding(String propertyPath) {
-		DefaultBindingConfiguration configuration = new DefaultBindingConfiguration(propertyPath);
-		bindingFactories.add(new BindingFactory(configuration));
-		return configuration;
-	}
-	
-	/**
-	 * Register a Formatter to format the model properties of a specific property type.
-	 * Convenience method that calls {@link FormatterRegistry#add(Class, Formatter)} internally.
-	 * The type may be a marker annotation type; if so, the Formatter will be used on properties having that marker annotation.
-	 * @param propertyType the model property type
-	 * @param formatter the formatter
-	 */
-	public void registerFormatter(Class<?> propertyType, Formatter<?> formatter) {
-		formatterRegistry.add(propertyType, formatter);
-	}
-	
-	/**
-	 * Register a Formatter to format the model properties of a specific property type.
-	 * Convenience method that calls {@link FormatterRegistry#add(GenericCollectionPropertyType, Formatter)} internally.
-	 * @param propertyType the model property type
-	 * @param formatter the formatter
-	 */
-	public void registerFormatter(GenericCollectionPropertyType propertyType, Formatter<?> formatter) {
-		formatterRegistry.add(propertyType, formatter);
-	}
-
-
-	/**
-	 * Register a FormatterFactory that creates Formatter instances as required to format model properties annotated with a specific annotation.
-	 * Convenience method that calls {@link FormatterRegistry#add(AnnotationFormatterFactory)} internally.
-	 * @param factory the formatter factory
-	 */
-	public void registerFormatterFactory(AnnotationFormatterFactory<?, ?> factory) {
-		formatterRegistry.add(factory);
-	}
-
-	/**
-	 * Configures the registry of Formatters to query when no explicit Formatter has been registered for a Binding.
-	 * Allows Formatters to be applied by property type and by property annotation.
-	 * @param registry the formatter registry
-	 */
-	public void setFormatterRegistry(FormatterRegistry formatterRegistry) {
-		Assert.notNull(formatterRegistry, "The FormatterRegistry is required");
-		this.formatterRegistry = formatterRegistry;
-	}
-
 	/**
 	 * Configure the MessageSource that resolves localized {@link BindingResult} alert messages.
 	 * @param messageSource the message source
@@ -190,44 +70,53 @@ public class GenericBinder implements Binder {
 	 * For a setValue attempt, the TypeConverter will be asked to perform a conversion if the value parsed by the Binding's Formatter is not assignable to the target property type.
 	 * For a getValue attempt, the TypeConverter will be asked to perform a conversion if the property type does not match the type T required by the Binding's Formatter.
 	 * @param typeConverter the type converter used by the binding system, which is based on Spring EL
-	 * @see EvaluationContext#getTypeConverter()
 	 */
 	public void setTypeConverter(TypeConverter typeConverter) {
-		Assert.notNull(messageSource, "The TypeConverter is required");
+		Assert.notNull(typeConverter, "The TypeConverter is required");
 		this.typeConverter = typeConverter;
 	}
 
-	// implementing BindingFactory
+	// implementing Binder
 
 	public Object getModel() {
 		return model;
 	}
 
 	public Binding getBinding(String property) {
-		for (BindingFactory factory: bindingFactories) {
-			if (factory.hasBindingFor(property)) {
-				return factory.getBinding(property);
+		PropertyPath path = new PropertyPath(property);
+		Binding binding = bindings.get(path.getFirstElement().getValue());
+		if (binding == null) {
+			binding = new PropertyBinding(path.getFirstElement().getValue(), model, typeConverter);
+			bindings.put(path.getFirstElement().getValue(), binding);
+		}
+		for (PropertyPathElement element : path.getNestedElements()) {
+			if (element.isIndex()) {
+				if (binding.isMap()) {
+					binding = binding.getKeyedBinding(element.getValue());
+				} else if (binding.isIndexable()) {
+					binding = binding.getIndexedBinding(element.getIntValue());
+				} else {
+					throw new IllegalArgumentException("Attempted to index a property that is not a Collection or Map");
+				}
+			} else {
+				binding = binding.getBinding(element.getValue());
 			}
 		}
-		throw new NoSuchBindingException(property);
+		return binding;
 	}
 
-	// implementing Binder
-	
 	public BindingResults bind(Map<String, ? extends Object> sourceValues) {
 		sourceValues = filter(sourceValues);
-		checkRequired(sourceValues);
 		ArrayListBindingResults results = new ArrayListBindingResults(sourceValues.size());
 		for (Map.Entry<String, ? extends Object> sourceValue : sourceValues.entrySet()) {
-			String property = sourceValue.getKey();
-			Object value = sourceValue.getValue();
-			results.add(getBinding(property).setValue(value));
+			Binding binding = getBinding(sourceValue.getKey());
+			results.add(bind(sourceValue, binding));
 		}
 		return results;
 	}
 
 	// subclassing hooks
-
+	
 	/**
 	 * Hook subclasses may use to filter the source values to bind.
 	 * This hook allows the binder to pre-process the source values before binding occurs.
@@ -241,549 +130,19 @@ public class GenericBinder implements Binder {
 	}
 
 	// internal helpers
-
-	private void checkRequired(Map<String, ? extends Object> sourceValues) {
-		List<String> missingRequired = new ArrayList<String>();
-		for (BindingFactory factory : bindingFactories) {
-			if (factory.configuration.isRequired()) {
-				boolean found = false;
-				for (String property : sourceValues.keySet()) {
-					if (factory.hasBindingFor(property)) {
-						found = true;
-					}
-				}
-				if (!found) {
-					missingRequired.add(factory.getPropertyPath());
-				}
+	
+	private BindingResult bind(Map.Entry<String, ? extends Object> sourceValue, Binding binding) {
+		String property = sourceValue.getKey();
+		Object value = sourceValue.getValue();
+		if (binding.isReadOnly()) {
+			return new PropertyNotWriteableResult(property, value, messageSource);
+		} else {
+			binding.applySourceValue(value);
+			if (binding.isValid()) {
+				binding.commit();
 			}
-		}
-		if (!missingRequired.isEmpty()) {
-			throw new MissingSourceValuesException(missingRequired, sourceValues);
+			return new BindingStatusResult(property, value, binding.getStatusAlert());
 		}
 	}
 	
-	private EvaluationContext createEvaluationContext() {
-		StandardEvaluationContext context = new StandardEvaluationContext();
-		context.setRootObject(model);
-		context.addPropertyAccessor(new MapAccessor());
-		context.setTypeConverter(new StandardTypeConverter(typeConverter));
-		return context;
-	}
-
-	public class BindingFactory {
-
-		private DefaultBindingConfiguration configuration;
-		
-		public BindingFactory(DefaultBindingConfiguration configuration) {
-			this.configuration = configuration;
-		}
-
-		public String getPropertyPath() {
-			return configuration.getPropertyPath();
-		}
-
-		public boolean hasBindingFor(String property) {
-			String propertyPath = propertyPath(property);
-			return configuration.getPropertyPath().equals(propertyPath);
-		}
-
-		public Binding getBinding(String property) {
-			Expression propertyExpression;
-			try {
-				propertyExpression = expressionParser.parseExpression(property);
-			} catch (org.springframework.expression.ParseException e) {
-				throw new IllegalArgumentException(
-						"Unable to get model binding; cannot parse property expression from property string ["
-								+ property + "]", e);
-			}
-			return new BindingImpl(propertyExpression, configuration.getFormatter());
-		}
-
-		private String propertyPath(String property) {
-			StringBuilder sb = new StringBuilder(property);
-			int searchIndex = 0;
-			while (searchIndex != -1) {
-				int keyStart = sb.indexOf("[", searchIndex);
-				searchIndex = -1;
-				if (keyStart != -1) {
-					int keyEnd = sb.indexOf("]", keyStart + 1);
-					if (keyEnd != -1) {
-						sb.delete(keyStart, keyEnd + 1);
-						searchIndex = keyEnd + 1;
-					}
-				}
-			}
-			return sb.toString();
-		}
-
-	}
-
-	class BindingImpl implements Binding {
-
-		private Expression property;
-
-		private Formatter formatter;
-
-		public BindingImpl(Expression property, Formatter formatter) {
-			this.property = property;
-			this.formatter = formatter;
-		}
-
-		// implementing Binding
-
-		public String getProperty() {
-			return property.getExpressionString();
-		}
-
-		public String getValue() {
-			Object value;
-			try {
-				value = property.getValue(createEvaluationContext());
-			} catch (ExpressionException e) {
-				throw new IllegalStateException("Failed to get property expression value - this should not happen", e);
-			}
-			// TODO if collection we want to format as a single string, need collection formatter
-			return format(value);
-		}
-
-		public BindingResult setValue(Object value) {
-			if (value instanceof String) {
-				return setStringValue((String) value);
-			} else if (value instanceof String[]) {
-				return setStringValues((String[]) value);
-			} else {
-				return setObjectValue(value);
-			}
-		}
-
-		public String format(Object selectableValue) {
-			Formatter formatter = getFormatter();
-			Class<?> formattedType = getFormattedObjectType(formatter.getClass());
-			selectableValue = typeConverter.convert(selectableValue, formattedType);
-			return formatter.format(selectableValue, LocaleContextHolder.getLocale());
-		}
-
-		public boolean isCollection() {
-			Class type = getType();
-			TypeDescriptor<?> typeDesc = TypeDescriptor.valueOf(type);
-			return typeDesc.isCollection() || typeDesc.isArray();
-		}
-
-		public String[] getCollectionValues() {
-			Object multiValue;
-			try {
-				multiValue = property.getValue(createEvaluationContext());
-			} catch (EvaluationException e) {
-				throw new IllegalStateException("Failed to get property expression value - this should not happen", e);
-			}
-			if (multiValue == null) {
-				return EMPTY_STRING_ARRAY;
-			}
-			TypeDescriptor<?> type = TypeDescriptor.valueOf(multiValue.getClass());
-			String[] formattedValues;
-			if (type.isCollection()) {
-				Collection<?> values = ((Collection<?>) multiValue);
-				formattedValues = (String[]) Array.newInstance(String.class, values.size());
-				copy(values, formattedValues);
-			} else if (type.isArray()) {
-				formattedValues = (String[]) Array.newInstance(String.class, Array.getLength(multiValue));
-				copy((Iterable<?>) multiValue, formattedValues);
-			} else {
-				throw new IllegalStateException();
-			}
-			return formattedValues;
-		}
-
-		// public impl only
-
-		public Class<?> getType() {
-			Class<?> type;
-			try {
-				type = property.getValueType(createEvaluationContext());
-			} catch (EvaluationException e) {
-				throw new IllegalArgumentException(
-						"Failed to get property expression value type - this should not happen", e);
-			}
-			return type;
-		}
-
-		// internal helpers
-
-		private BindingResult setStringValue(String formatted) {
-			Object parsed;
-			try {
-				// if binding to a collection we may want collection formatter to convert String to Collection
-				// alternatively, we could map value to a single element e.g. String -> Address via AddressFormatter, which would bind to addresses[0]
-				// probably want to give preference to collection formatter if one is registered
-				Formatter formatter = getFormatter();
-				parsed = formatter.parse(formatted, LocaleContextHolder.getLocale());
-			} catch (ParseException e) {
-				return new InvalidFormat(property.getExpressionString(), formatted, e);
-			}
-			return setValue(parsed, formatted);
-		}
-
-		private BindingResult setStringValues(String[] formatted) {
-			Formatter formatter = getFormatter();
-			Class parsedType = getFormattedObjectType(formatter.getClass());
-			if (parsedType == null) {
-				parsedType = String.class;
-			}
-			Object parsed = Array.newInstance(parsedType, formatted.length);
-			for (int i = 0; i < formatted.length; i++) {
-				Object parsedValue;
-				try {
-					parsedValue = formatter.parse(formatted[i], LocaleContextHolder.getLocale());
-				} catch (ParseException e) {
-					return new InvalidFormat(property.getExpressionString(), formatted, e);
-				}
-				Array.set(parsed, i, parsedValue);
-			}
-			return setValue(parsed, formatted);
-		}
-
-		private BindingResult setObjectValue(Object value) {
-			return setValue(value, value);
-		}
-
-		private Formatter getFormatter() {
-			if (formatter != null) {
-				return formatter;
-			} else {
-				TypeDescriptor type;
-				try {
-					type = property.getValueTypeDescriptor(createEvaluationContext());
-				} catch (EvaluationException e) {
-					throw new IllegalArgumentException(
-							"Failed to get property expression value type descriptor - this should not happen", e);
-				}
-				Formatter formatter = formatterRegistry.getFormatter(type);
-				return formatter != null ? formatter : defaultFormatter;
-			}
-		}
-
-		private void copy(Iterable<?> values, String[] formattedValues) {
-			int i = 0;
-			for (Object value : values) {
-				formattedValues[i] = format(value);
-				i++;
-			}
-		}
-
-		private BindingResult setValue(Object parsedValue, Object userValue) {
-			try {
-				property.setValue(createEvaluationContext(), parsedValue);
-				return new Success(property.getExpressionString(), userValue);
-			} catch (EvaluationException e) {
-				return new EvaluationError(property.getExpressionString(), userValue, e);
-			}
-		}
-		
-		private Class getFormattedObjectType(Class formatterClass) {
-			// TODO consider caching this info
-			Class classToIntrospect = formatterClass;
-			while (classToIntrospect != null) {
-				Type[] ifcs = classToIntrospect.getGenericInterfaces();
-				for (Type ifc : ifcs) {
-					if (ifc instanceof ParameterizedType) {
-						ParameterizedType paramIfc = (ParameterizedType) ifc;
-						Type rawType = paramIfc.getRawType();
-						if (Formatter.class.equals(rawType)) {
-							Type arg = paramIfc.getActualTypeArguments()[0];
-							if (arg instanceof TypeVariable) {
-								arg = GenericTypeResolver.resolveTypeVariable((TypeVariable) arg, formatterClass);
-							}
-							if (arg instanceof Class) {
-								return (Class) arg;
-							}
-						}
-						else if (ApplicationListener.class.isAssignableFrom((Class) rawType)) {
-							return getFormattedObjectType((Class) rawType);
-						}
-					}
-					else if (ApplicationListener.class.isAssignableFrom((Class) ifc)) {
-						return getFormattedObjectType((Class) ifc);
-					}
-				}
-				classToIntrospect = classToIntrospect.getSuperclass();
-			}
-			return null;
-		}
-
-	}
-
-	static class DefaultFormatter implements Formatter {
-		public String format(Object object, Locale locale) {
-			if (object == null) {
-				return "";
-			} else {
-				return object.toString();
-			}
-		}
-
-		public Object parse(String formatted, Locale locale) throws ParseException {
-			if (formatted == "") {
-				return null;
-			} else {
-				return formatted;
-			}
-		}
-	}
-
-	static class ArrayListBindingResults implements BindingResults {
-
-		private List<BindingResult> results;
-
-		public ArrayListBindingResults() {
-			results = new ArrayList<BindingResult>();
-		}
-
-		public ArrayListBindingResults(int size) {
-			results = new ArrayList<BindingResult>(size);
-		}
-
-		public void add(BindingResult result) {
-			results.add(result);
-		}
-
-		// implementing Iterable
-
-		public Iterator<BindingResult> iterator() {
-			return results.iterator();
-		}
-
-		// implementing BindingResults
-
-		public BindingResults successes() {
-			ArrayListBindingResults results = new ArrayListBindingResults();
-			for (BindingResult result : this) {
-				if (!result.isFailure()) {
-					results.add(result);
-				}
-			}
-			return results;
-		}
-
-		public BindingResults failures() {
-			ArrayListBindingResults results = new ArrayListBindingResults();
-			for (BindingResult result : this) {
-				if (result.isFailure()) {
-					results.add(result);
-				}
-			}
-			return results;
-		}
-
-		public BindingResult get(int index) {
-			return results.get(index);
-		}
-
-		public List<String> properties() {
-			List<String> properties = new ArrayList<String>(results.size());
-			for (BindingResult result : this) {
-				properties.add(result.getProperty());
-			}
-			return properties;
-		}
-
-		public int size() {
-			return results.size();
-		}
-
-		public String toString() {
-			return "[BindingResults = " + results.toString() + "]";
-		}
-	}
-
-	class InvalidFormat implements BindingResult {
-
-		private String property;
-
-		private Object sourceValue;
-
-		private ParseException cause;
-
-		public InvalidFormat(String property, Object sourceValue, ParseException cause) {
-			this.property = property;
-			this.sourceValue = sourceValue;
-			this.cause = cause;
-		}
-
-		public String getProperty() {
-			return property;
-		}
-
-		public Object getSourceValue() {
-			return sourceValue;
-		}
-
-		public boolean isFailure() {
-			return true;
-		}
-
-		public Alert getAlert() {
-			return new AbstractAlert() {
-				public String getCode() {
-					return "invalidFormat";
-				}
-
-				public Severity getSeverity() {
-					return Severity.ERROR;
-				}
-
-				public String getMessage() {
-					MessageBuilder builder = new MessageBuilder(messageSource);
-					builder.code(getCode());
-					builder.arg("label", new ResolvableArgument(property));
-					builder.arg("value", sourceValue);
-					builder.arg("errorOffset", cause.getErrorOffset());
-					builder.defaultMessage("Failed to bind to property '" + property + "'; the user value "
-							+ StylerUtils.style(sourceValue) + " has an invalid format and could no be parsed");
-					return builder.build();
-				}
-			};
-		}
-
-		public String toString() {
-			return getAlert().toString();
-		}
-
-	}
-
-	class Success implements BindingResult {
-
-		private String property;
-
-		private Object sourceValue;
-
-		public Success(String property, Object sourceValue) {
-			this.property = property;
-			this.sourceValue = sourceValue;
-		}
-
-		public String getProperty() {
-			return property;
-		}
-
-		public Object getSourceValue() {
-			return sourceValue;
-		}
-
-		public boolean isFailure() {
-			return false;
-		}
-
-		public Alert getAlert() {
-			return new AbstractAlert() {
-				public String getCode() {
-					return "bindSuccess";
-				}
-
-				public Severity getSeverity() {
-					return Severity.INFO;
-				}
-
-				public String getMessage() {
-					MessageBuilder builder = new MessageBuilder(messageSource);
-					builder.code("bindSuccess");
-					builder.arg("label", new ResolvableArgument(property));
-					builder.arg("value", sourceValue);
-					builder.defaultMessage("Successfully bound user value " + StylerUtils.style(sourceValue)
-							+ " to property '" + property + "'");
-					return builder.build();
-				}
-			};
-		}
-		
-		public String toString() {
-			return getAlert().toString();
-		}
-
-	}
-
-	class EvaluationError implements BindingResult {
-
-		private String property;
-
-		private Object sourceValue;
-
-		private EvaluationException cause;
-
-		public EvaluationError(String property, Object sourceValue, EvaluationException cause) {
-			this.property = property;
-			this.sourceValue = sourceValue;
-			this.cause = cause;
-		}
-
-		public String getProperty() {
-			return property;
-		}
-
-		public Object getSourceValue() {
-			return sourceValue;
-		}
-
-		public boolean isFailure() {
-			return true;
-		}
-
-		public Alert getAlert() {
-			return new AbstractAlert() {
-				public String getCode() {
-					SpelMessage spelCode = ((SpelEvaluationException) cause).getMessageCode();
-					if (spelCode == SpelMessage.EXCEPTION_DURING_PROPERTY_WRITE) {
-						return "conversionFailed";
-					} else {
-						return "couldNotSetValue";
-					}
-				}
-
-				public Severity getSeverity() {
-					return Severity.FATAL;
-				}
-
-				public String getMessage() {
-					SpelMessage spelCode = ((SpelEvaluationException) cause).getMessageCode();
-					if (spelCode == SpelMessage.EXCEPTION_DURING_PROPERTY_WRITE) {
-						AccessException accessException = (AccessException) cause.getCause();
-						if (accessException.getCause() != null) {
-							Throwable cause = accessException.getCause();
-							if (cause instanceof SpelEvaluationException
-									&& ((SpelEvaluationException) cause).getMessageCode() == SpelMessage.TYPE_CONVERSION_ERROR) {
-								// TODO this could be a ConverterExecutorNotFoundException if no suitable converter was found
-								cause.getCause().printStackTrace();
-								ConversionFailedException failure = (ConversionFailedException) cause.getCause();
-								MessageBuilder builder = new MessageBuilder(messageSource);
-								builder.code("conversionFailed");
-								builder.arg("label", new ResolvableArgument(property));
-								builder.arg("value", sourceValue);
-								builder.defaultMessage("Failed to bind to property '" + property + "'; user value "
-										+ StylerUtils.style(sourceValue) + " could not be converted to property type ["
-										+ failure.getTargetType().getName() + "]");
-								return builder.build();
-							}
-						}
-					}
-					MessageBuilder builder = new MessageBuilder(messageSource);
-					builder.code("couldNotSetValue");
-					builder.arg("label", new ResolvableArgument(property));
-					builder.arg("value", sourceValue);
-					builder.defaultMessage("Failed to bind to property '" + property + "'; reason = "
-							+ cause.getLocalizedMessage());
-					return builder.build();
-				}
-
-			};
-		}
-		
-		public String toString() {
-			return getAlert().toString();
-		}
-
-	}
-	static abstract class AbstractAlert implements Alert {
-		public String toString() {
-			return getCode() + " - " + getMessage();
-		}
-	}
 }

org.springframework.context/src/main/java/org/springframework/ui/binding/support/PropertyBinding.java

@@ -0,0 +1,307 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import java.beans.BeanInfo;
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.Array;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.text.ParseException;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import org.springframework.context.i18n.LocaleContextHolder;
+import org.springframework.core.GenericCollectionTypeResolver;
+import org.springframework.core.GenericTypeResolver;
+import org.springframework.core.MethodParameter;
+import org.springframework.core.convert.TypeConverter;
+import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.ui.alert.Alert;
+import org.springframework.ui.binding.Binding;
+import org.springframework.ui.format.Formatter;
+import org.springframework.util.ReflectionUtils;
+
+@SuppressWarnings("unchecked")
+public class PropertyBinding implements Binding {
+
+	private String property;
+
+	private Object model;
+
+	private Formatter valueFormatter = DefaultFormatter.INSTANCE;
+
+	private Formatter mapKeyFormatter = DefaultFormatter.INSTANCE;
+
+	private Formatter indexedValueFormatter = DefaultFormatter.INSTANCE;
+
+	private PropertyDescriptor propertyDescriptor;
+
+	private TypeConverter typeConverter;
+
+	private Object sourceValue;
+	
+	// TODO make a ValueBuffer
+	private Object bufferedValue;
+	
+	public PropertyBinding(String property, Object model, TypeConverter typeConverter) {
+		this.propertyDescriptor = findPropertyDescriptor(property, model);
+		this.property = property;
+		this.model = model;
+		this.typeConverter = typeConverter;
+	}
+
+	public Object getValue() {
+		if (isDirty()) {
+			// TODO null check isn't good enough
+			if (bufferedValue != null) {
+				return formatValue(bufferedValue);
+			} else {
+				return sourceValue;
+			}
+		} else {
+			return formatValue(getModel().getValue());
+		}
+	}
+
+	public void applySourceValue(Object sourceValue) {
+		if (isReadOnly()) {
+			throw new IllegalStateException("Property is read-only");
+		}
+		this.sourceValue = sourceValue;
+		if (sourceValue instanceof String) {
+			try { 
+				this.bufferedValue = valueFormatter.parse((String) sourceValue, getLocale());
+			} catch (ParseException e) {
+				
+			}
+		} else if (sourceValue instanceof String[]) {
+			String[] sourceValues = (String[]) sourceValue;
+			Class<?> parsedType = getFormattedObjectType(indexedValueFormatter.getClass());
+			if (parsedType == null) {
+				parsedType = String.class;
+			}
+			Object parsed = Array.newInstance(parsedType, sourceValues.length);
+			boolean parseError = false;
+			for (int i = 0; i < sourceValues.length; i++) {
+				Object parsedValue;
+				try {
+					parsedValue = indexedValueFormatter.parse(sourceValues[i], LocaleContextHolder.getLocale());
+					Array.set(parsed, i, parsedValue);
+				} catch (ParseException e) {
+					parseError = true;
+				}
+			}
+			if (!parseError) {
+				bufferedValue = parsed;
+			}
+		}
+	}
+
+	public boolean isDirty() {
+		return sourceValue != null || bufferedValue != null;
+	}
+
+	public boolean isValid() {
+		if (!isDirty()) {
+			return true;
+		} else {
+			if (bufferedValue == null) {
+				return false;
+			} else {
+				return true;
+			}
+		}
+	}
+
+	public void commit() {
+		if (!isDirty()) {
+			throw new IllegalStateException("Binding not dirty; nothing to commit");
+		}
+		if (!isValid()) {
+			throw new IllegalStateException("Binding is invalid; only commit valid bindings");
+		}
+		try {
+			getModel().setValue(bufferedValue);
+			this.bufferedValue = null;
+		} catch (Exception e) {
+			
+		}
+	}
+
+	public Model getModel() {
+		return new Model() {		
+			public Object getValue() {
+				return ReflectionUtils.invokeMethod(propertyDescriptor.getReadMethod(), model);
+			}
+
+			public Class<?> getValueType() {
+				return propertyDescriptor.getPropertyType();
+			}
+			
+			public void setValue(Object value) {
+				if (isReadOnly()) {
+					throw new IllegalStateException("Property is read-only");
+				}						
+				TypeDescriptor targetType = new TypeDescriptor(new MethodParameter(propertyDescriptor.getWriteMethod(), 0));
+				if (value != null && typeConverter.canConvert(value.getClass(), targetType)) {
+					value = typeConverter.convert(value, targetType);					
+				}
+				ReflectionUtils.invokeMethod(propertyDescriptor.getWriteMethod(), model, value);
+			}
+		};
+	}
+
+	public Alert getStatusAlert() {
+		return null;
+	}
+
+	public Binding getBinding(String nestedProperty) {
+		assertScalarProperty();
+		if (getValue() == null) {
+			createValue();
+		}
+		return new PropertyBinding(nestedProperty, getValue(), typeConverter);
+	}
+
+	public boolean isIndexable() {
+		return getModel().getValueType().isArray() || List.class.isAssignableFrom(getModel().getValueType());
+	}
+
+	public Binding getIndexedBinding(int index) {
+		assertListProperty();
+		//return new IndexedBinding(index, (List) getValue(), getCollectionTypeDescriptor(), typeConverter);
+		return null;
+	}
+
+	public boolean isMap() {
+		return Map.class.isAssignableFrom(getModel().getValueType());
+	}
+
+	public Binding getKeyedBinding(Object key) {
+		assertMapProperty();
+		if (key instanceof String) {
+			try {
+				key = mapKeyFormatter.parse((String) key, getLocale());
+			} catch (ParseException e) {
+				throw new IllegalArgumentException("Invald key", e);
+			}
+		}
+		//TODO return new KeyedPropertyBinding(key, (Map) getValue(), getMapTypeDescriptor());
+		return null;
+	}
+
+	public boolean isReadOnly() {
+		return propertyDescriptor.getWriteMethod() != null && !markedNotEditable();
+	}
+
+	public String formatValue(Object value) {
+		Class<?> formattedType = getFormattedObjectType(valueFormatter.getClass());
+		value = typeConverter.convert(value, formattedType);
+		return valueFormatter.format(value, getLocale());
+	}
+
+	// internal helpers
+
+	private PropertyDescriptor findPropertyDescriptor(String property, Object model) {
+		PropertyDescriptor[] propDescs = getBeanInfo(model.getClass()).getPropertyDescriptors();
+		for (PropertyDescriptor propDesc : propDescs) {
+			if (propDesc.getName().equals(property)) {
+				return propDesc;
+			}
+		}
+		throw new IllegalArgumentException("No property '" + property + "' found on model ["
+				+ model.getClass().getName() + "]");
+	}
+
+	private BeanInfo getBeanInfo(Class<?> clazz) {
+		try {
+			return Introspector.getBeanInfo(clazz);
+		} catch (IntrospectionException e) {
+			throw new IllegalStateException("Unable to introspect model type " + clazz);
+		}
+	}
+
+	private Locale getLocale() {
+		return LocaleContextHolder.getLocale();
+	}
+
+	private void createValue() {
+		try {
+			Object value = getModel().getValueType().newInstance();
+			getModel().setValue(value);
+		} catch (InstantiationException e) {
+			throw new IllegalStateException("Could not lazily instantiate model of type [" + getModel().getValueType().getName()
+					+ "] to access property" + property, e);
+		} catch (IllegalAccessException e) {
+			throw new IllegalStateException("Could not lazily instantiate model of type [" + getModel().getValueType().getName()
+					+ "] to access property" + property, e);
+		}
+	}
+
+	private Class getFormattedObjectType(Class formatterClass) {
+		Class classToIntrospect = formatterClass;
+		while (classToIntrospect != null) {
+			Type[] ifcs = classToIntrospect.getGenericInterfaces();
+			for (Type ifc : ifcs) {
+				if (ifc instanceof ParameterizedType) {
+					ParameterizedType paramIfc = (ParameterizedType) ifc;
+					Type rawType = paramIfc.getRawType();
+					if (Formatter.class.equals(rawType)) {
+						Type arg = paramIfc.getActualTypeArguments()[0];
+						if (arg instanceof TypeVariable) {
+							arg = GenericTypeResolver.resolveTypeVariable((TypeVariable) arg, formatterClass);
+						}
+						if (arg instanceof Class) {
+							return (Class) arg;
+						}
+					} else if (Formatter.class.isAssignableFrom((Class) rawType)) {
+						return getFormattedObjectType((Class) rawType);
+					}
+				} else if (Formatter.class.isAssignableFrom((Class) ifc)) {
+					return getFormattedObjectType((Class) ifc);
+				}
+			}
+			classToIntrospect = classToIntrospect.getSuperclass();
+		}
+		return null;
+	}
+
+	@SuppressWarnings("unused")
+	private CollectionTypeDescriptor getCollectionTypeDescriptor() {
+		Class<?> elementType = GenericCollectionTypeResolver.getCollectionReturnType(propertyDescriptor
+				.getReadMethod());
+		return new CollectionTypeDescriptor(getModel().getValueType(), elementType);
+	}
+
+	private void assertScalarProperty() {
+		if (isIndexable()) {
+			throw new IllegalArgumentException("Is a Collection but should be a scalar");
+		}
+		if (isMap()) {
+			throw new IllegalArgumentException("Is a Map but should be a scalar");
+		}
+	}
+
+	private void assertListProperty() {
+		if (!isIndexable()) {
+			throw new IllegalStateException("Not a List property binding");
+		}
+	}
+
+	private void assertMapProperty() {
+		if (!isIndexable()) {
+			throw new IllegalStateException("Not a Map property binding");
+		}
+	}
+
+	private boolean markedNotEditable() {
+		return false;
+	}
+
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/PropertyNotWriteableResult.java

@@ -0,0 +1,67 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import org.springframework.context.MessageSource;
+import org.springframework.core.style.StylerUtils;
+import org.springframework.ui.alert.Alert;
+import org.springframework.ui.alert.Severity;
+import org.springframework.ui.binding.BindingResult;
+import org.springframework.ui.message.MessageBuilder;
+import org.springframework.ui.message.ResolvableArgument;
+
+class PropertyNotWriteableResult implements BindingResult {
+
+	private String property;
+
+	private Object sourceValue;
+
+	private MessageSource messageSource;
+	
+	public PropertyNotWriteableResult(String property, Object sourceValue, MessageSource messageSource) {
+		this.property = property;
+		this.sourceValue = sourceValue;
+		this.messageSource = messageSource;
+	}
+
+	public String getProperty() {
+		return property;
+	}
+
+	public Object getSourceValue() {
+		return sourceValue;
+	}
+
+	public boolean isFailure() {
+		return true;
+	}
+
+	public Alert getAlert() {
+		return new Alert() {
+			public String getCode() {
+				return "propertyNotWriteable";
+			}
+
+			public Severity getSeverity() {
+				return Severity.WARNING;
+			}
+
+			public String getMessage() {
+				MessageBuilder builder = new MessageBuilder(messageSource);
+				builder.code("bindSuccess");
+				builder.arg("label", new ResolvableArgument(property));
+				builder.arg("value", sourceValue);
+				// TODO lazily create default message
+				builder.defaultMessage("Successfully bound user value " + StylerUtils.style(sourceValue)
+						+ " to property '" + property + "'");
+				return builder.build();
+			}
+		};
+	}
+
+	public String toString() {
+		return getAlert().toString();
+	}
+
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/PropertyPath.java

@@ -0,0 +1,44 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+
+public class PropertyPath {
+
+	private List<PropertyPathElement> elements = new ArrayList<PropertyPathElement>();
+
+	public PropertyPath(String propertyPath) {
+		// a.b.c[i].d[key].e
+		String[] props = propertyPath.split("\\.");
+		if (props.length == 0) {
+			props = new String[] { propertyPath };
+		}
+		for (String prop : props) {
+			if (prop.startsWith("[")) {
+				int end = prop.indexOf(']');
+				String index = prop.substring(0, end);
+				elements.add(new PropertyPathElement(index, true));
+			} else {
+				elements.add(new PropertyPathElement(prop, false));
+			}
+		}
+	}
+
+	public PropertyPathElement getFirstElement() {
+		return elements.get(0);
+	}
+
+	public List<PropertyPathElement> getNestedElements() {
+		if (elements.size() > 1) {
+			return elements.subList(1, elements.size() - 1);
+		} else {
+			return Collections.emptyList();
+		}
+	}
+
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/PropertyPathElement.java

@@ -0,0 +1,28 @@
+/**
+ * 
+ */
+package org.springframework.ui.binding.support;
+
+public class PropertyPathElement {
+
+	private String value;
+
+	private boolean index;
+
+	public PropertyPathElement(String value, boolean index) {
+		this.value = value;
+		this.index = index;
+	}
+
+	public boolean isIndex() {
+		return index;
+	}
+
+	public String getValue() {
+		return value;
+	}
+
+	public int getIntValue() {
+		return Integer.parseInt(value);
+	}
+}

org.springframework.context/src/main/java/org/springframework/ui/binding/support/WebBinder.java

@@ -72,7 +72,7 @@ public class WebBinder extends GenericBinder {
 			} else if (field.startsWith(presentPrefix)) {
 				field = field.substring(presentPrefix.length());
 				if (!sourceValues.containsKey(field) && !sourceValues.containsKey(defaultPrefix + field)) {
-					value = getEmptyValue((BindingImpl) getBinding(field));
+					value = getEmptyValue((PropertyBinding) getBinding(field));
 					filteredValues.put(field, value);
 				}
 			} else {
@@ -82,8 +82,8 @@ public class WebBinder extends GenericBinder {
 		return filteredValues;
 	}
 
-	protected Object getEmptyValue(BindingImpl binding) {
-		Class<?> type = binding.getType();
+	protected Object getEmptyValue(PropertyBinding binding) {
+		Class<?> type = binding.getModel().getValueType();
 		if (boolean.class.equals(type) || Boolean.class.equals(type)) {
 			return Boolean.FALSE;
 		} else {

org.springframework.context/src/main/java/org/springframework/ui/lifecycle/BindAndValidateLifecycle.java

@@ -1,88 +1,7 @@
-/*
- * Copyright 2002-2009 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
 package org.springframework.ui.lifecycle;
 
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
+public interface BindAndValidateLifecycle {
 
-import org.springframework.ui.alert.AlertContext;
-import org.springframework.ui.binding.Binder;
-import org.springframework.ui.binding.BindingResult;
-import org.springframework.ui.binding.BindingResults;
-import org.springframework.ui.validation.ValidationFailure;
-import org.springframework.ui.validation.Validator;
-
-/**
- * Implementation of the model bind and validate lifecycle.
- * @author Keith Donald
- * @since 3.0
- */
-public final class BindAndValidateLifecycle {
-
-	private Binder binder;
-
-	private Validator validator;
-
-	private ValidationDecider validationDecider = ValidationDecider.ALWAYS_VALIDATE;
-
-	private final AlertContext alertContext;
-
-	/**
-	 * Create a new bind and validate lifecycle.
-	 * @param binder the binder to use for model binding
-	 * @param validator the validator to use for model validation
-	 * @param alertContext a context for adding binding and validation-related alerts
-	 */
-	public BindAndValidateLifecycle(Binder binder, Validator validator, AlertContext alertContext) {
-		this.binder = binder;
-		this.validator = validator;
-		this.alertContext = alertContext;
-	}
+	public void execute();
 	
-	/**
-	 * Configures the strategy that determines if validation should execute after binding.
-	 * @param validationDecider the validation decider
-	 */
-	public void setValidationDecider(ValidationDecider validationDecider) {
-		this.validationDecider = validationDecider;
-	}
-
-	/**
-	 * Execute the bind and validate lifecycle.
-	 * Any bind or validation errors are recorded as alerts against the {@link AlertContext}.
-	 * @param sourceValues the source values to bind and validate
-	 */
-	public void execute(Map<String, ? extends Object> sourceValues) {
-		BindingResults bindingResults = binder.bind(sourceValues);
-		List<ValidationFailure> validationFailures = validate(bindingResults);
-		for (BindingResult result : bindingResults.failures()) {
-			alertContext.add(result.getProperty(), result.getAlert());
-		}
-		for (ValidationFailure failure : validationFailures) {
-			alertContext.add(failure.getProperty(), failure.getAlert());
-		}		
-	}
-	
-	private List<ValidationFailure> validate(BindingResults bindingResults) {
-		if (validator != null && validationDecider.shouldValidateAfter(bindingResults)) {
-			return validator.validate(binder.getModel(), bindingResults.successes().properties());
-		} else {
-			return Collections.emptyList();
-		}
-	}
-
 }

org.springframework.context/src/main/java/org/springframework/ui/lifecycle/BindAndValidateLifecycleFactory.java

@@ -0,0 +1,5 @@
+package org.springframework.ui.lifecycle;
+
+public interface BindAndValidateLifecycleFactory {
+	BindAndValidateLifecycle getLifecycle(Object model);
+}

org.springframework.context/src/main/java/org/springframework/ui/lifecycle/BindAndValidateLifecycleImpl.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2002-2009 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.ui.lifecycle;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.springframework.ui.alert.AlertContext;
+import org.springframework.ui.binding.Binder;
+import org.springframework.ui.binding.BindingResult;
+import org.springframework.ui.binding.BindingResults;
+import org.springframework.ui.validation.ValidationFailure;
+import org.springframework.ui.validation.Validator;
+
+/**
+ * Implementation of the model bind and validate lifecycle.
+ * @author Keith Donald
+ * @since 3.0
+ */
+public final class BindAndValidateLifecycleImpl {
+
+	private Binder binder;
+
+	private Validator validator;
+
+	private ValidationDecider validationDecider = ValidationDecider.ALWAYS_VALIDATE;
+
+	private final AlertContext alertContext;
+
+	/**
+	 * Create a new bind and validate lifecycle.
+	 * @param binder the binder to use for model binding
+	 * @param validator the validator to use for model validation
+	 * @param alertContext a context for adding binding and validation-related alerts
+	 */
+	public BindAndValidateLifecycleImpl(Binder binder, Validator validator, AlertContext alertContext) {
+		this.binder = binder;
+		this.validator = validator;
+		this.alertContext = alertContext;
+	}
+	
+	/**
+	 * Configures the strategy that determines if validation should execute after binding.
+	 * @param validationDecider the validation decider
+	 */
+	public void setValidationDecider(ValidationDecider validationDecider) {
+		this.validationDecider = validationDecider;
+	}
+
+	/**
+	 * Execute the bind and validate lifecycle.
+	 * Any bind or validation errors are recorded as alerts against the {@link AlertContext}.
+	 * @param sourceValues the source values to bind and validate
+	 */
+	public void execute(Map<String, ? extends Object> sourceValues) {
+		BindingResults bindingResults = binder.bind(sourceValues);
+		List<ValidationFailure> validationFailures = validate(bindingResults);
+		for (BindingResult result : bindingResults.failures()) {
+			alertContext.add(result.getProperty(), result.getAlert());
+		}
+		for (ValidationFailure failure : validationFailures) {
+			alertContext.add(failure.getProperty(), failure.getAlert());
+		}		
+	}
+	
+	private List<ValidationFailure> validate(BindingResults bindingResults) {
+		if (validator != null && validationDecider.shouldValidateAfter(bindingResults)) {
+			return validator.validate(binder.getModel(), bindingResults.successes().properties());
+		} else {
+			return Collections.emptyList();
+		}
+	}
+
+}

org.springframework.context/src/main/java/org/springframework/ui/lifecycle/ValidationDecider.java

@@ -21,7 +21,7 @@ import org.springframework.ui.binding.BindingResults;
  * Decides if validation should run for an execution of the bind and validate lifecycle.
  * @author Keith Donald
  * @since 3.0
- * @see BindAndValidateLifecycle#execute(java.util.Map)
+ * @see BindAndValidateLifecycleImpl#execute(java.util.Map)
  */
 interface ValidationDecider {