Improve support for @Conditional on @Configuration

Introduce new ConfigurationCondition interface allowing more
fine-grained control for @Conditional when used with @Configuration
beans.

Primarily added so that the evaluation of conditions that inspect bean
definitions can be deferred until all @Configuration classes have been
parsed.

Issue: SPR-10534

spring-context/src/main/java/org/springframework/context/annotation/AnnotatedBeanDefinitionReader.java

@@ -45,12 +45,12 @@ public class AnnotatedBeanDefinitionReader {
 
 	private final BeanDefinitionRegistry registry;
 
-	private Environment environment;
-
 	private BeanNameGenerator beanNameGenerator = new AnnotationBeanNameGenerator();
 
 	private ScopeMetadataResolver scopeMetadataResolver = new AnnotationScopeMetadataResolver();
 
+	private ConditionEvaluator conditionEvaluator;
+
 
 	/**
 	 * Create a new {@code AnnotatedBeanDefinitionReader} for the given registry.
@@ -79,7 +79,8 @@ public class AnnotatedBeanDefinitionReader {
 		Assert.notNull(registry, "BeanDefinitionRegistry must not be null");
 		Assert.notNull(environment, "Environment must not be null");
 		this.registry = registry;
-		this.environment = environment;
+		this.conditionEvaluator = new ConditionEvaluator(registry, environment,
+				null, null, null);
 		AnnotationConfigUtils.registerAnnotationConfigProcessors(this.registry);
 	}
 
@@ -97,7 +98,8 @@ public class AnnotatedBeanDefinitionReader {
 	 * @see #registerBean(Class, String, Class...)
 	 */
 	public void setEnvironment(Environment environment) {
-		this.environment = environment;
+		this.conditionEvaluator = new ConditionEvaluator(this.registry, environment,
+				null, null, null);
 	}
 
 	/**
@@ -133,7 +135,7 @@ public class AnnotatedBeanDefinitionReader {
 
 	public void registerBean(Class<?> annotatedClass, String name, Class<? extends Annotation>... qualifiers) {
 		AnnotatedGenericBeanDefinition abd = new AnnotatedGenericBeanDefinition(annotatedClass);
-		if (ConditionEvaluator.get(abd.getMetadata(), true).shouldSkip(this.registry, this.environment)) {
+		if (conditionEvaluator.shouldSkip(abd.getMetadata())) {
 			return;
 		}
 		ScopeMetadata scopeMetadata = this.scopeMetadataResolver.resolveScopeMetadata(abd);

spring-context/src/main/java/org/springframework/context/annotation/ClassPathBeanDefinitionScanner.java

@@ -262,12 +262,6 @@ public class ClassPathBeanDefinitionScanner extends ClassPathScanningCandidateCo
 		return beanDefinitions;
 	}
 
-	@Override
-	protected boolean isConditionMatch(MetadataReader metadataReader) {
-		return !ConditionEvaluator.get(metadataReader.getAnnotationMetadata(), true).shouldSkip(
-				getRegistry(), getEnvironment());
-	}
-
 	/**
 	 * Apply further settings to the given bean definition,
 	 * beyond the contents retrieved from scanning the component class.

spring-context/src/main/java/org/springframework/context/annotation/ClassPathScanningCandidateComponentProvider.java

@@ -28,6 +28,7 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.BeanDefinitionStoreException;
 import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.context.ResourceLoaderAware;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.EnvironmentCapable;
@@ -85,6 +86,8 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 
 	private final List<TypeFilter> excludeFilters = new LinkedList<TypeFilter>();
 
+	private ConditionEvaluator conditionEvaluator;
+
 
 	/**
 	 * Create a ClassPathScanningCandidateComponentProvider with a {@link StandardEnvironment}.
@@ -162,6 +165,7 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 	 */
 	public void setEnvironment(Environment environment) {
 		this.environment = environment;
+		this.conditionEvaluator = null;
 	}
 
 	@Override
@@ -169,6 +173,13 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 		return this.environment;
 	}
 
+	/**
+	 * Returns the {@link BeanDefinitionRegistry} used by this scanner or {@code null}.
+	 */
+	protected BeanDefinitionRegistry getRegistry() {
+		return null;
+	}
+
 	/**
 	 * Set the resource pattern to use when scanning the classpath.
 	 * This value will be appended to each base package name.
@@ -342,9 +353,12 @@ public class ClassPathScanningCandidateComponentProvider implements EnvironmentC
 	 * @param metadataReader the ASM ClassReader for the class
 	 * @return whether the class qualifies as a candidate component
 	 */
-	protected boolean isConditionMatch(MetadataReader metadataReader) {
-		return !ConditionEvaluator.get(metadataReader.getAnnotationMetadata(), true).shouldSkip(
-				null, getEnvironment());
+	private boolean isConditionMatch(MetadataReader metadataReader) {
+		if (this.conditionEvaluator == null) {
+			this.conditionEvaluator = new ConditionEvaluator(getRegistry(),
+					getEnvironment(), null, null, getResourceLoader());
+		}
+		return !conditionEvaluator.shouldSkip(metadataReader.getAnnotationMetadata());
 	}
 
 	/**

spring-context/src/main/java/org/springframework/context/annotation/Condition.java

@@ -25,15 +25,18 @@ import org.springframework.core.type.AnnotationMetadata;
  * A single {@code condition} that must be {@linkplain #matches matched} in order
  * for a component to be registered.
  *
- * <p>Conditions are checked immediately before a component bean-definition is due to be
- * registered and are free to veto registration based on any criteria that can be
- * determined at that point.
+ * <p>Conditions are checked immediately before the bean-definition is due to be
+ * registered and are free to veto registration based on any criteria that can
+ * be determined at that point.
  *
  * <p>Conditions must follow the same restrictions as {@link BeanFactoryPostProcessor}
- * and take care to never interact with bean instances.
+ * and take care to never interact with bean instances. For more fine-grained control
+ * of conditions that interact with {@code @Configuration} beans consider the
+ * {@link ConfigurationCondition} interface.
  *
  * @author Phillip Webb
  * @since 4.0
+ * @see ConfigurationCondition
  * @see Conditional
  * @see ConditionContext
  */

spring-context/src/main/java/org/springframework/context/annotation/ConditionContext.java

@@ -18,6 +18,7 @@ package org.springframework.context.annotation;
 
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.ApplicationContext;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.ResourceLoader;
 
@@ -65,4 +66,6 @@ public interface ConditionContext {
 	 */
 	ClassLoader getClassLoader();
 
+	ApplicationContext getApplicationContext();
+
 }

spring-context/src/main/java/org/springframework/context/annotation/ConditionEvaluator.java

@@ -22,7 +22,9 @@ import java.util.List;
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.ConfigurationCondition.ConfigurationPhase;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.EnvironmentCapable;
 import org.springframework.core.io.ResourceLoader;
@@ -33,106 +35,93 @@ import org.springframework.util.ClassUtils;
 import org.springframework.util.MultiValueMap;
 
 /**
- * Utility class used to evaluate {@link Conditional} annotations.
+ * Internal class used to evaluate {@link Conditional} annotations.
  *
  * @author Phillip Webb
  * @since 4.0
  */
-abstract class ConditionEvaluator {
+class ConditionEvaluator {
 
 	private static final String CONDITIONAL_ANNOTATION = Conditional.class.getName();
 
-	private static final ConditionEvaluator NONE = new ConditionEvaluator() {
 
-		@Override
-		public boolean shouldSkip(BeanDefinitionRegistry registry, Environment environment) {
-			return false;
-		}
-
-	};
+	private final ConditionContextImpl context;
 
 
 	/**
-	 * Evaluate if any condition does not match and hence registration should be skipped.
-	 * @param registry the registry or {@code null}
-	 * @param environment the environment or {@code null}
-	 * @return if the registration should be skipped
+	 * Create a new {@link ConditionEvaluator} instance.
 	 */
-	public abstract boolean shouldSkip(BeanDefinitionRegistry registry,
-			Environment environment);
-
-
-	/**
-	 * Returns a {@link ConditionEvaluator} instance of the specified metadata.
-	 * @param metadata the metadata to test
-	 * @param deferIfConfigurationCandidate if the evaluator should be deferred when the
-	 *        metadata is from a {@code @Configuration} candidate.
-	 * @return the evaluator instance
-	 */
-	public static ConditionEvaluator get(AnnotatedTypeMetadata metadata,
-			boolean deferIfConfigurationCandidate) {
-		if (metadata == null || !metadata.isAnnotated(CONDITIONAL_ANNOTATION)) {
-			// Shortcut to save always creating a ConditionEvaluator
-			return NONE;
-		}
-
-		// Defer @Conditional @Configuration classes until later when the
-		// ConfigurationClassPostProcessor will evaluate them. Allows @Conditional
-		// implementations that inspect beans created by @Configuration to work
-		if (deferIfConfigurationCandidate && metadata instanceof AnnotationMetadata
-				&& ConfigurationClassUtils.isConfigurationCandidate((AnnotationMetadata) metadata)) {
-			return NONE;
-		}
-
-		return new ConditionEvaluatorImpl(metadata);
+	public ConditionEvaluator(BeanDefinitionRegistry registry, Environment environment,
+			ApplicationContext applicationContext, ClassLoader classLoader,
+			ResourceLoader resourceLoader) {
+		this.context = new ConditionContextImpl(registry, environment,
+				applicationContext, classLoader, resourceLoader);
 	}
 
 
 	/**
-	 * Implementation of {@link ConditionEvaluator}.
+	 * Determine if an item should be skipped based on {@code @Conditional} annotations.
+	 * The {@link ConfigurationPhase} will be deduced from the type of item (i.e. a
+	 * {@code @Configuration} class will be {@link ConfigurationPhase#PARSE_CONFIGURATION})
+	 * @param metadata the meta data
+	 * @return if the item should be skipped
 	 */
-	private static class ConditionEvaluatorImpl extends ConditionEvaluator {
+	public boolean shouldSkip(AnnotatedTypeMetadata metadata) {
+		return shouldSkip(metadata, null);
+	}
 
-		private AnnotatedTypeMetadata metadata;
-
-
-		public ConditionEvaluatorImpl(AnnotatedTypeMetadata metadata) {
-			this.metadata = metadata;
+	/**
+	 * Determine if an item should be skipped based on {@code @Conditional} annotations.
+	 * @param metadata the meta data
+	 * @param phase the phase of the call
+	 * @return if the item should be skipped
+	 */
+	public boolean shouldSkip(AnnotatedTypeMetadata metadata, ConfigurationPhase phase) {
+		if (metadata == null || !metadata.isAnnotated(CONDITIONAL_ANNOTATION)) {
+			return false;
 		}
 
+		if (phase == null) {
+			if (metadata instanceof AnnotationMetadata &&
+					ConfigurationClassUtils.isConfigurationCandidate((AnnotationMetadata) metadata)) {
+				return shouldSkip(metadata, ConfigurationPhase.PARSE_CONFIGURATION);
+			}
+			return shouldSkip(metadata, ConfigurationPhase.REGISTER_BEAN);
+		}
 
-		@Override
-		public boolean shouldSkip(BeanDefinitionRegistry registry, Environment environment) {
-			ConditionContext context = new ConditionContextImpl(registry, environment);
-			if (this.metadata != null) {
-				for (String[] conditionClasses : getConditionClasses(metadata)) {
-					for (String conditionClass : conditionClasses) {
-						if (!getCondition(conditionClass, context.getClassLoader()).matches(
-								context, metadata)) {
-							return true;
-						}
+		for (String[] conditionClasses : getConditionClasses(metadata)) {
+			for (String conditionClass : conditionClasses) {
+				Condition condition = getCondition(conditionClass, context.getClassLoader());
+				ConfigurationPhase requiredPhase = null;
+				if (condition instanceof ConfigurationCondition) {
+					requiredPhase = ((ConfigurationCondition) condition).getConfigurationPhase();
+				}
+				if (requiredPhase == null || requiredPhase == phase) {
+					if (!condition.matches(context, metadata)) {
+						return true;
 					}
 				}
 			}
-			return false;
-		}
-
-		@SuppressWarnings("unchecked")
-		private static List<String[]> getConditionClasses(AnnotatedTypeMetadata metadata) {
-			MultiValueMap<String, Object> attributes = metadata.getAllAnnotationAttributes(
-					CONDITIONAL_ANNOTATION, true);
-			Object values = attributes == null ? null : attributes.get("value");
-			return (List<String[]>) (values == null ? Collections.emptyList() : values);
-		}
-
-		private static Condition getCondition(String conditionClassName,
-				ClassLoader classloader) {
-			Class<?> conditionClass = ClassUtils.resolveClassName(conditionClassName,
-					classloader);
-			return (Condition) BeanUtils.instantiateClass(conditionClass);
 		}
+		return false;
 	}
 
+	@SuppressWarnings("unchecked")
+	private List<String[]> getConditionClasses(AnnotatedTypeMetadata metadata) {
+		MultiValueMap<String, Object> attributes = metadata.getAllAnnotationAttributes(
+				CONDITIONAL_ANNOTATION, true);
+		Object values = attributes == null ? null : attributes.get("value");
+		return (List<String[]>) (values == null ? Collections.emptyList() : values);
+	}
+
+	private Condition getCondition(String conditionClassName,
+			ClassLoader classloader) {
+		Class<?> conditionClass = ClassUtils.resolveClassName(conditionClassName,
+				classloader);
+		return (Condition) BeanUtils.instantiateClass(conditionClass);
+	}
+
+
 	/**
 	 * Implementation of a {@link ConditionContext}.
 	 */
@@ -144,18 +133,24 @@ abstract class ConditionEvaluator {
 
 		private Environment environment;
 
+		private ApplicationContext applicationContext;
+
+		private ClassLoader classLoader;
+
+		private ResourceLoader resourceLoader;
+
 
 		public ConditionContextImpl(BeanDefinitionRegistry registry,
-				Environment environment) {
+				Environment environment, ApplicationContext applicationContext,
+				ClassLoader classLoader, ResourceLoader resourceLoader) {
 			this.registry = registry;
 			this.beanFactory = deduceBeanFactory(registry);
 			this.environment = environment;
-			if (this.environment == null) {
-				this.environment = deduceEnvironment(registry);
-			}
+			this.applicationContext = applicationContext;
+			this.classLoader = classLoader;
+			this.resourceLoader = resourceLoader;
 		}
 
-
 		private ConfigurableListableBeanFactory deduceBeanFactory(Object source) {
 			if (source == null) {
 				return null;
@@ -169,24 +164,26 @@ abstract class ConditionEvaluator {
 			return null;
 		}
 
-		private Environment deduceEnvironment(BeanDefinitionRegistry registry) {
-			if (registry == null) {
-				return null;
+		@Override
+		public BeanDefinitionRegistry getRegistry() {
+			if (this.registry != null) {
+				return this.registry;
 			}
-			if (registry instanceof EnvironmentCapable) {
-				return ((EnvironmentCapable) registry).getEnvironment();
+			 if(getBeanFactory() != null && getBeanFactory() instanceof BeanDefinitionRegistry) {
+				return (BeanDefinitionRegistry) getBeanFactory();
 			}
 			return null;
 		}
 
-		@Override
-		public BeanDefinitionRegistry getRegistry() {
-			return this.registry;
-		}
-
 		@Override
 		public Environment getEnvironment() {
-			return this.environment;
+			if (this.environment != null) {
+				return this.environment;
+			}
+			if (getRegistry() != null && getRegistry() instanceof EnvironmentCapable) {
+				return ((EnvironmentCapable) getRegistry()).getEnvironment();
+			}
+			return null;
 		}
 
 		@Override
@@ -197,6 +194,9 @@ abstract class ConditionEvaluator {
 
 		@Override
 		public ResourceLoader getResourceLoader() {
+			if (this.resourceLoader != null) {
+				return this.resourceLoader;
+			}
 			if (registry instanceof ResourceLoader) {
 				return (ResourceLoader) registry;
 			}
@@ -205,8 +205,24 @@ abstract class ConditionEvaluator {
 
 		@Override
 		public ClassLoader getClassLoader() {
-			ResourceLoader resourceLoader = getResourceLoader();
-			return (resourceLoader == null ? null : resourceLoader.getClassLoader());
+			if (this.classLoader != null) {
+				return this.classLoader;
+			}
+			if (getResourceLoader() != null) {
+				return getResourceLoader().getClassLoader();
+			}
+			return null;
+		}
+
+		@Override
+		public ApplicationContext getApplicationContext() {
+			if (this.applicationContext != null) {
+				return this.applicationContext;
+			}
+			if (getRegistry() != null && getRegistry() instanceof ApplicationContext) {
+				return (ApplicationContext) getRegistry();
+			}
+			return null;
 		}
 	}
 

spring-context/src/main/java/org/springframework/context/annotation/Conditional.java

@@ -26,7 +26,7 @@ import java.lang.annotation.Target;
  * {@linkplain #value() specified conditions} match.
  *
  * <p>A <em>condition</em> is any state that can be determined programmatically
- * immediately before the bean is due to be created (see {@link Condition} for details).
+ * before the bean definition is due to be registered (see {@link Condition} for details).
  *
  * <p>The {@code @Conditional} annotation may be used in any of the following ways:
  * <ul>

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClass.java

@@ -219,7 +219,6 @@ final class ConfigurationClass {
 		}
 	}
 
-
 	@Override
 	public boolean equals(Object other) {
 		return (this == other || (other instanceof ConfigurationClass &&

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassBeanDefinitionReader.java

@@ -42,6 +42,8 @@ import org.springframework.beans.factory.support.BeanDefinitionReader;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanNameGenerator;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.ConfigurationCondition.ConfigurationPhase;
 import org.springframework.core.annotation.AnnotationAttributes;
 import org.springframework.core.env.Environment;
 import org.springframework.core.io.Resource;
@@ -85,14 +87,17 @@ class ConfigurationClassBeanDefinitionReader {
 
 	private final BeanNameGenerator importBeanNameGenerator;
 
+	private final ConditionEvaluator conditionEvaluator;
+
 	/**
 	 * Create a new {@link ConfigurationClassBeanDefinitionReader} instance that will be used
 	 * to populate the given {@link BeanDefinitionRegistry}.
 	 */
 	public ConfigurationClassBeanDefinitionReader(
-			BeanDefinitionRegistry registry, SourceExtractor sourceExtractor,
-			ProblemReporter problemReporter, MetadataReaderFactory metadataReaderFactory,
-			ResourceLoader resourceLoader, Environment environment, BeanNameGenerator importBeanNameGenerator) {
+			BeanDefinitionRegistry registry, ApplicationContext applicationContext,
+			SourceExtractor sourceExtractor, ProblemReporter problemReporter,
+			MetadataReaderFactory metadataReaderFactory, ResourceLoader resourceLoader,
+			Environment environment, BeanNameGenerator importBeanNameGenerator) {
 
 		this.registry = registry;
 		this.sourceExtractor = sourceExtractor;
@@ -101,6 +106,8 @@ class ConfigurationClassBeanDefinitionReader {
 		this.resourceLoader = resourceLoader;
 		this.environment = environment;
 		this.importBeanNameGenerator = importBeanNameGenerator;
+		this.conditionEvaluator = new ConditionEvaluator(registry, environment,
+				applicationContext, null, resourceLoader);
 	}
 
 
@@ -109,9 +116,9 @@ class ConfigurationClassBeanDefinitionReader {
 	 * based on its contents.
 	 */
 	public void loadBeanDefinitions(Set<ConfigurationClass> configurationModel) {
-		TrackedConditionEvaluator conditionEvaluator = new TrackedConditionEvaluator();
+		TrackedConditionEvaluator trackedConditionEvaluator = new TrackedConditionEvaluator();
 		for (ConfigurationClass configClass : configurationModel) {
-			loadBeanDefinitionsForConfigurationClass(configClass, conditionEvaluator);
+			loadBeanDefinitionsForConfigurationClass(configClass, trackedConditionEvaluator);
 		}
 	}
 
@@ -120,9 +127,8 @@ class ConfigurationClassBeanDefinitionReader {
 	 * class itself, all its {@link Bean} methods
 	 */
 	private void loadBeanDefinitionsForConfigurationClass(ConfigurationClass configClass,
-			TrackedConditionEvaluator conditionEvaluator) {
-
-		if(conditionEvaluator.shouldSkip(configClass)) {
+			TrackedConditionEvaluator trackedConditionEvaluator) {
+		if (trackedConditionEvaluator.shouldSkip(configClass)) {
 			removeBeanDefinition(configClass);
 			return;
 		}
@@ -172,8 +178,8 @@ class ConfigurationClassBeanDefinitionReader {
 	 * with the BeanDefinitionRegistry based on its contents.
 	 */
 	private void loadBeanDefinitionsForBeanMethod(BeanMethod beanMethod) {
-		if (ConditionEvaluator.get(beanMethod.getMetadata(), false).shouldSkip(
-				this.registry, this.environment)) {
+		if (conditionEvaluator.shouldSkip(beanMethod.getMetadata(),
+				ConfigurationPhase.REGISTER_BEAN)) {
 			return;
 		}
 		ConfigurationClass configClass = beanMethod.getConfigurationClass();
@@ -384,6 +390,7 @@ class ConfigurationClassBeanDefinitionReader {
 		}
 	}
 
+
 	/**
 	 * Evaluate {@Code @Conditional} annotations, tracking results and taking into
 	 * account 'imported by'.
@@ -402,14 +409,13 @@ class ConfigurationClassBeanDefinitionReader {
 					}
 				}
 				if (skip == null) {
-					skip = ConditionEvaluator.get(configClass.getMetadata(), false).shouldSkip(
-							registry, environment);
+					skip = conditionEvaluator.shouldSkip(configClass.getMetadata(),
+							ConfigurationPhase.REGISTER_BEAN);
 				}
 				this.skipped.put(configClass, skip);
 			}
 			return skip;
 		}
-
 	}
 
 }

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -46,8 +46,10 @@ import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionReader;
 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanNameGenerator;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.EnvironmentAware;
 import org.springframework.context.ResourceLoaderAware;
+import org.springframework.context.annotation.ConfigurationCondition.ConfigurationPhase;
 import org.springframework.core.NestedIOException;
 import org.springframework.core.annotation.AnnotationAttributes;
 import org.springframework.core.annotation.AnnotationAwareOrderComparator;
@@ -119,6 +121,8 @@ class ConfigurationClassParser {
 
 	private final List<DeferredImportSelectorHolder> deferredImportSelectors = new LinkedList<DeferredImportSelectorHolder>();
 
+	private final ConditionEvaluator conditionEvaluator;
+
 
 	/**
 	 * Create a new {@link ConfigurationClassParser} instance that will be used
@@ -126,7 +130,8 @@ class ConfigurationClassParser {
 	 */
 	public ConfigurationClassParser(MetadataReaderFactory metadataReaderFactory,
 			ProblemReporter problemReporter, Environment environment, ResourceLoader resourceLoader,
-			BeanNameGenerator componentScanBeanNameGenerator, BeanDefinitionRegistry registry) {
+			BeanNameGenerator componentScanBeanNameGenerator, BeanDefinitionRegistry registry,
+			ApplicationContext applicationContext) {
 
 		this.metadataReaderFactory = metadataReaderFactory;
 		this.problemReporter = problemReporter;
@@ -135,6 +140,8 @@ class ConfigurationClassParser {
 		this.registry = registry;
 		this.componentScanParser = new ComponentScanAnnotationParser(
 				resourceLoader, environment, componentScanBeanNameGenerator, registry);
+		this.conditionEvaluator = new ConditionEvaluator(registry, environment,
+				applicationContext, null, resourceLoader);
 	}
 
 
@@ -162,7 +169,7 @@ class ConfigurationClassParser {
 	 * @param beanName may be null, but if populated represents the bean id
 	 * (assumes that this configuration class was configured via XML)
 	 */
-	public void parse(String className, String beanName) throws IOException {
+	protected final void parse(String className, String beanName) throws IOException {
 		MetadataReader reader = this.metadataReaderFactory.getMetadataReader(className);
 		processConfigurationClass(new ConfigurationClass(reader, beanName));
 	}
@@ -172,13 +179,17 @@ class ConfigurationClassParser {
 	 * @param clazz the Class to parse
 	 * @param beanName must not be null (as of Spring 3.1.1)
 	 */
-	public void parse(Class<?> clazz, String beanName) throws IOException {
+	protected final void parse(Class<?> clazz, String beanName) throws IOException {
 		processConfigurationClass(new ConfigurationClass(clazz, beanName));
 	}
 
 
 	protected void processConfigurationClass(ConfigurationClass configClass) throws IOException {
 
+		if (conditionEvaluator.shouldSkip(configClass.getMetadata(), ConfigurationPhase.PARSE_CONFIGURATION)) {
+			return;
+		}
+
 		if (this.configurationClasses.contains(configClass) && configClass.getBeanName() != null) {
 			// Explicit bean definition found, probably replacing an import.
 			// Let's remove the old one and go with the new one.
@@ -224,15 +235,14 @@ class ConfigurationClassParser {
 		AnnotationAttributes componentScan = attributesFor(sourceClass.getMetadata(), ComponentScan.class);
 		if (componentScan != null) {
 			// the config class is annotated with @ComponentScan -> perform the scan immediately
-			if (!ConditionEvaluator.get(configClass.getMetadata(), false).shouldSkip(
-					this.registry, this.environment)) {
+			if (!conditionEvaluator.shouldSkip(sourceClass.getMetadata(), ConfigurationPhase.REGISTER_BEAN)) {
 				Set<BeanDefinitionHolder> scannedBeanDefinitions =
 						this.componentScanParser.parse(componentScan, sourceClass.getMetadata().getClassName());
 
 				// check the set of scanned definitions for any further config classes and parse recursively if necessary
 				for (BeanDefinitionHolder holder : scannedBeanDefinitions) {
 					if (ConfigurationClassUtils.checkConfigurationClassCandidate(holder.getBeanDefinition(), this.metadataReaderFactory)) {
-						this.parse(holder.getBeanDefinition().getBeanClassName(), holder.getBeanName());
+						parse(holder.getBeanDefinition().getBeanClassName(), holder.getBeanName());
 					}
 				}
 			}

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassPostProcessor.java

@@ -46,6 +46,8 @@ import org.springframework.beans.factory.support.BeanDefinitionRegistry;
 import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
 import org.springframework.beans.factory.support.BeanNameGenerator;
 import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
 import org.springframework.context.EnvironmentAware;
 import org.springframework.context.ResourceLoaderAware;
 import org.springframework.context.annotation.ConfigurationClassParser.ImportRegistry;
@@ -85,7 +87,7 @@ import static org.springframework.context.annotation.AnnotationConfigUtils.*;
  * @since 3.0
  */
 public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPostProcessor,
-		ResourceLoaderAware, BeanClassLoaderAware, EnvironmentAware {
+		ResourceLoaderAware, BeanClassLoaderAware, EnvironmentAware, ApplicationContextAware {
 
 	private static final String IMPORT_AWARE_PROCESSOR_BEAN_NAME =
 			ConfigurationClassPostProcessor.class.getName() + ".importAwareProcessor";
@@ -102,6 +104,8 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 
 	private Environment environment;
 
+	private ApplicationContext applicationContext;
+
 	private ResourceLoader resourceLoader = new DefaultResourceLoader();
 
 	private ClassLoader beanClassLoader = ClassUtils.getDefaultClassLoader();
@@ -130,6 +134,7 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 	};
 
 
+
 	/**
 	 * Set the {@link SourceExtractor} to use for generated bean definitions
 	 * that correspond to {@link Bean} factory methods.
@@ -189,6 +194,12 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 		this.environment = environment;
 	}
 
+	@Override
+	public void setApplicationContext(ApplicationContext applicationContext)
+			throws BeansException {
+		this.applicationContext = applicationContext;
+	}
+
 	@Override
 	public void setResourceLoader(ResourceLoader resourceLoader) {
 		Assert.notNull(resourceLoader, "ResourceLoader must not be null");
@@ -279,7 +290,8 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 		// Parse each @Configuration class
 		ConfigurationClassParser parser = new ConfigurationClassParser(
 				this.metadataReaderFactory, this.problemReporter, this.environment,
-				this.resourceLoader, this.componentScanBeanNameGenerator, registry);
+				this.resourceLoader, this.componentScanBeanNameGenerator, registry,
+				this.applicationContext);
 		parser.parse(configCandidates);
 		parser.validate();
 
@@ -301,7 +313,8 @@ public class ConfigurationClassPostProcessor implements BeanDefinitionRegistryPo
 		// Read the model and create bean definitions based on its content
 		if (this.reader == null) {
 			this.reader = new ConfigurationClassBeanDefinitionReader(
-					registry, this.sourceExtractor, this.problemReporter, this.metadataReaderFactory,
+					registry, this.applicationContext, this.sourceExtractor,
+					this.problemReporter, this.metadataReaderFactory,
 					this.resourceLoader, this.environment, this.importBeanNameGenerator);
 		}
 

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationCondition.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2002-2013 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.context.annotation;
+
+/**
+ * A {@link Condition} that offers more fine-grained control when used with
+ * {@code @Configuration}. Allows certain {@link Condition}s to adapt when they match
+ * based on the configuration phase. For example, a condition that checks if a bean has
+ * already been registered might choose to only be evaluated on the
+ * {@link ConfigurationPhase#REGISTER_BEAN REGISTER_BEAN} {@link ConfigurationPhase}.
+ *
+ * @author Phillip Webb
+ */
+public interface ConfigurationCondition extends Condition {
+
+	/**
+	 * Returns the {@link ConfigurationPhase} in which the condition should be evaluated.
+	 */
+	ConfigurationPhase getConfigurationPhase();
+
+	/**
+	 * The various configuration phases where the condition could be evaluated.
+	 */
+	public static enum ConfigurationPhase {
+
+		/**
+		 * The {@link Condition} should be evaluated as a {@code @Configuration} class is
+		 * being parsed.
+		 *
+		 * <p>If the condition does not match at this point the {@code @Configuration}
+		 * class will not be added.
+		 */
+		PARSE_CONFIGURATION,
+
+		/**
+		 * The {@link Condition} should be evaluated when adding a regular (non
+		 * {@code @Configuration}) bean. The condition will not prevent
+		 * {@code @Configuration} classes from being added.
+		 *
+		 * <p>At the time that the condition is evaluated all {@code @Configuration}s
+		 * will have been parsed.
+		 */
+		REGISTER_BEAN
+	}
+
+}