adding binding model

spring-webflow/src/main/java/org/springframework/webflow/engine/model/BindingModel.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2004-2008 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.webflow.engine.model;
+
+import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
+
+/**
+ * Model support for binding elements.
+ * @author Scott Andrews
+ */
+public class BindingModel extends AbstractModel {
+
+	private String property;
+
+	private String converter;
+
+	/**
+	 * Create a binding model
+	 * @param property the name of the bound property
+	 * @param converter the converter
+	 */
+	public BindingModel(String property, String converter) {
+		setProperty(property);
+		setConverter(converter);
+	}
+
+	public boolean isMergeableWith(Model model) {
+		if (!(model instanceof BindingModel)) {
+			return false;
+		}
+		BindingModel binding = (BindingModel) model;
+		return ObjectUtils.nullSafeEquals(getProperty(), binding.getProperty());
+	}
+
+	public void merge(Model model) {
+		BindingModel binding = (BindingModel) model;
+		setConverter(merge(getConverter(), binding.getConverter()));
+	}
+
+	/**
+	 * @return the property
+	 */
+	public String getProperty() {
+		return property;
+	}
+
+	/**
+	 * @param property the property to set
+	 */
+	public void setProperty(String property) {
+		if (StringUtils.hasText(property)) {
+			this.property = property;
+		} else {
+			this.property = null;
+		}
+	}
+
+	/**
+	 * @return the class property
+	 */
+	public String getConverter() {
+		return converter;
+	}
+
+	/**
+	 * @param converter the class property to set
+	 */
+	public void setConverter(String converter) {
+		if (StringUtils.hasText(converter)) {
+			this.converter = converter;
+		} else {
+			this.converter = null;
+		}
+	}
+
+}