[SPR-6184] Introduced ResourceTypeAwareContextLoader interface and removed dependency on AnnotationConfigContextLoader in TestContext.

org.springframework.test/src/main/java/org/springframework/test/context/ContextLoader.java

@@ -19,8 +19,7 @@ package org.springframework.test.context;
 import org.springframework.context.ApplicationContext;
 
 /**
- * Strategy interface for loading an
- * {@link ApplicationContext application context}.
+ * Strategy interface for loading an {@link ApplicationContext application context}.
  *
  * <p>Clients of a ContextLoader should call
  * {@link #processLocations(Class,String...) processLocations()} prior to
@@ -34,6 +33,7 @@ import org.springframework.context.ApplicationContext;
  *
  * <p>Spring provides the following out-of-the-box implementations:
  * <ul>
+ * <li>{@link org.springframework.test.context.support.AnnotationConfigContextLoader AnnotationConfigContextLoader}</li>
  * <li>{@link org.springframework.test.context.support.GenericXmlContextLoader GenericXmlContextLoader}</li>
  * <li>{@link org.springframework.test.context.support.GenericPropertiesContextLoader GenericPropertiesContextLoader}</li>
  * </ul>

org.springframework.test/src/main/java/org/springframework/test/context/ResourceTypeAwareContextLoader.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2002-2011 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.test.context;
+
+/**
+ * TODO Document ResourceTypeAwareContextLoader.
+ *
+ * @author Sam Brannen
+ * @since 3.1
+ */
+public interface ResourceTypeAwareContextLoader extends ContextLoader {
+
+	/**
+	 * @return <code>true</code> if this <code>ContextLoader</code> supports
+	 * String-based resource locations
+	 * @see ContextConfiguration#locations()
+	 * @see ContextConfiguration#value()
+	 */
+	boolean supportsStringResources();
+
+	/**
+	 * @return <code>true</code> if this <code>ContextLoader</code> supports
+	 * Class-based resource locations
+	 * @see ContextConfiguration#classes()
+	 */
+	boolean supportsClassResources();
+
+}

org.springframework.test/src/main/java/org/springframework/test/context/TestContext.java

@@ -29,7 +29,6 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.core.AttributeAccessorSupport;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.core.style.ToStringCreator;
-import org.springframework.test.context.support.AnnotationConfigContextLoader;
 import org.springframework.util.Assert;
 import org.springframework.util.ObjectUtils;
 import org.springframework.util.StringUtils;
@@ -231,9 +230,9 @@ public class TestContext extends AttributeAccessorSupport {
 
 		// TODO [SPR-6184] Implement recursive search for configuration classes.
 		// This needs to integrate seamlessly (i.e., analogous yet mutually
-		// exclusive) with the existing locations search. Furthermore, the
-		// solution must not depend on an explicit ACCL check.
-		if (contextLoader instanceof AnnotationConfigContextLoader) {
+		// exclusive) with the existing locations search.
+		if ((contextLoader instanceof ResourceTypeAwareContextLoader)
+				&& ((ResourceTypeAwareContextLoader) contextLoader).supportsClassResources()) {
 
 			ContextConfiguration cc = declaringClass.getAnnotation(annotationType);
 			if (logger.isTraceEnabled()) {
@@ -317,11 +316,12 @@ public class TestContext extends AttributeAccessorSupport {
 	 */
 	public ApplicationContext getApplicationContext() {
 		synchronized (this.contextCache) {
-			ApplicationContext context = this.contextCache.get(contextKeyString(this.locations));
+			String contextKeyString = contextKeyString(this.locations);
+			ApplicationContext context = this.contextCache.get(contextKeyString);
 			if (context == null) {
 				try {
 					context = loadApplicationContext();
-					this.contextCache.put(contextKeyString(this.locations), context);
+					this.contextCache.put(contextKeyString, context);
 				}
 				catch (Exception ex) {
 					throw new IllegalStateException("Failed to load ApplicationContext", ex);

org.springframework.test/src/main/java/org/springframework/test/context/support/AbstractContextLoader.java

@@ -19,6 +19,7 @@ package org.springframework.test.context.support;
 import org.springframework.context.ApplicationContext;
 import org.springframework.core.io.support.ResourcePatternUtils;
 import org.springframework.test.context.ContextLoader;
+import org.springframework.test.context.ResourceTypeAwareContextLoader;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.ObjectUtils;
@@ -37,7 +38,7 @@ import org.springframework.util.StringUtils;
  * @see #generateDefaultLocations
  * @see #modifyLocations
  */
-public abstract class AbstractContextLoader implements ContextLoader {
+public abstract class AbstractContextLoader implements ResourceTypeAwareContextLoader {
 
 	/**
 	 * If the supplied <code>locations</code> are <code>null</code> or
@@ -58,8 +59,8 @@ public abstract class AbstractContextLoader implements ContextLoader {
 	 * @see org.springframework.test.context.ContextLoader#processLocations
 	 */
 	public final String[] processLocations(Class<?> clazz, String... locations) {
-		return (ObjectUtils.isEmpty(locations) && isGenerateDefaultLocations()) ?
-				generateDefaultLocations(clazz) : modifyLocations(clazz, locations);
+		return (ObjectUtils.isEmpty(locations) && isGenerateDefaultLocations()) ? generateDefaultLocations(clazz)
+				: modifyLocations(clazz, locations);
 	}
 
 	/**
@@ -80,8 +81,8 @@ public abstract class AbstractContextLoader implements ContextLoader {
 		Assert.notNull(clazz, "Class must not be null");
 		String suffix = getResourceSuffix();
 		Assert.hasText(suffix, "Resource suffix must not be empty");
-		return new String[] { ResourceUtils.CLASSPATH_URL_PREFIX + "/" +
-				ClassUtils.convertClassNameToResourcePath(clazz.getName()) + suffix };
+		return new String[] { ResourceUtils.CLASSPATH_URL_PREFIX + "/"
+				+ ClassUtils.convertClassNameToResourcePath(clazz.getName()) + suffix };
 	}
 
 	/**
@@ -119,7 +120,6 @@ public abstract class AbstractContextLoader implements ContextLoader {
 		return modifiedLocations;
 	}
 
-
 	/**
 	 * Determine whether or not <em>default</em> resource locations should be
 	 * generated if the <code>locations</code> provided to
@@ -141,4 +141,22 @@ public abstract class AbstractContextLoader implements ContextLoader {
 	 */
 	protected abstract String getResourceSuffix();
 
+	/**
+	 * TODO Document supportsStringResources() implementation.
+	 * 
+	 * @return <code>true</code>
+	 */
+	public boolean supportsStringResources() {
+		return true;
+	}
+
+	/**
+	 * TODO Document supportsClassResources() implementations.
+	 * 
+	 * @return <code>false</code>
+	 */
+	public boolean supportsClassResources() {
+		return false;
+	}
+
 }

org.springframework.test/src/main/java/org/springframework/test/context/support/AnnotationConfigContextLoader.java

@@ -127,4 +127,20 @@ public class AnnotationConfigContextLoader extends AbstractGenericContextLoader
 		return "Config";
 	}
 
+	/**
+	 * @return <code>true</code>
+	 */
+	@Override
+	public boolean supportsClassResources() {
+		return true;
+	}
+
+	/**
+	 * @return <code>false</code>
+	 */
+	@Override
+	public boolean supportsStringResources() {
+		return false;
+	}
+
 }

org.springframework.test/src/test/java/org/springframework/test/context/junit4/annotation/AnnotationConfigSpringJUnit4ClassRunnerAppCtxTests.java

@@ -26,7 +26,7 @@ import org.springframework.test.context.support.AnnotationConfigContextLoader;
  * @author Sam Brannen
  * @since 3.1
  */
-@ContextConfiguration(loader = AnnotationConfigContextLoader.class, classes = AnnotationConfigSpringJUnit4ClassRunnerAppCtxTestsConfig.class, inheritLocations = false)
+@ContextConfiguration(loader = AnnotationConfigContextLoader.class, classes = PojoAndStringConfig.class)
 public class AnnotationConfigSpringJUnit4ClassRunnerAppCtxTests extends SpringJUnit4ClassRunnerAppCtxTests {
 	/* all tests are in the parent class. */
 }

org.springframework.test/src/test/java/org/springframework/test/context/junit4/annotation/PojoAndStringConfig.java

@@ -28,7 +28,7 @@ import org.springframework.context.annotation.Configuration;
  * @since 3.1
  */
 @Configuration
-public class AnnotationConfigSpringJUnit4ClassRunnerAppCtxTestsConfig {
+public class PojoAndStringConfig {
 
 	@Bean
 	public Employee employee() {