Support *Aware ImportBeanDefinitionRegistars

Implementations of Spring's ImportBeanDefinitionRegistrar interface may
now implement any of the following *Aware interfaces and have their
respective methods called prior to #registerBeanDefinitions:

 - BeanFactoryAware
 - BeanClassLoaderAware
 - ResourceLoaderAware

Issue: SPR-9568

spring-context/src/test/java/org/springframework/context/annotation/ImportBeanDefinitionRegistrarTests.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2002-2012 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;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.*;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.Test;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.BeanClassLoaderAware;
+import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.context.MessageSource;
+import org.springframework.context.ResourceLoaderAware;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.core.type.AnnotationMetadata;
+
+/**
+ * Integration tests for {@link ImportBeanDefinitionRegistrar}.
+ *
+ * @author Oliver Gierke
+ * @author Chris Beams
+ */
+public class ImportBeanDefinitionRegistrarTests {
+
+	@Test
+	public void shouldInvokeAwareMethodsInImportBeanDefinitionRegistrar() {
+
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
+		context.getBean(MessageSource.class);
+
+		assertThat(SampleRegistrar.beanFactory, is((BeanFactory) context.getBeanFactory()));
+		assertThat(SampleRegistrar.classLoader, is(context.getBeanFactory().getBeanClassLoader()));
+		assertThat(SampleRegistrar.resourceLoader, is(notNullValue()));
+	}
+
+	@Sample
+	@Configuration
+	static class Config {
+
+	}
+
+	@Target(ElementType.TYPE)
+	@Retention(RetentionPolicy.RUNTIME)
+	@Import(SampleRegistrar.class)
+	public static @interface Sample {
+
+	}
+
+	static class SampleRegistrar implements ImportBeanDefinitionRegistrar, BeanClassLoaderAware, ResourceLoaderAware,
+			BeanFactoryAware {
+
+		static ClassLoader classLoader;
+		static ResourceLoader resourceLoader;
+		static BeanFactory beanFactory;
+
+		public void setBeanClassLoader(ClassLoader classLoader) {
+			SampleRegistrar.classLoader = classLoader;
+		}
+
+		public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+			SampleRegistrar.beanFactory = beanFactory;
+		}
+
+		public void setResourceLoader(ResourceLoader resourceLoader) {
+			SampleRegistrar.resourceLoader = resourceLoader;
+		}
+
+		public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
+		}
+	}
+}