Added MappingContextAware interface and BeanPostProcessor for same

spring-data-commons-core/src/main/java/org/springframework/data/mapping/context/MappingContextAware.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2011 by the original author(s).
+ *
+ * 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.data.mapping.context;
+
+import org.springframework.data.mapping.model.MappingContext;
+
+/**
+ * An interface to make beans aware of the active MappingContext in the current ApplicationContext.
+ *
+ * @author Jon Brisbin <jbrisbin@vmware.com>
+ */
+public interface MappingContextAware {
+
+  /**
+   * The active MappingContext for the environment.
+   *
+   * @param mappingContext
+   */
+  void setMappingContext(MappingContext mappingContext);
+
+}

spring-data-commons-core/src/main/java/org/springframework/data/mapping/context/MappingContextAwareBeanPostProcessor.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2011 by the original author(s).
+ *
+ * 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.data.mapping.context;
+
+import java.util.Map;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.config.BeanPostProcessor;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.data.mapping.model.MappingContext;
+
+/**
+ * BeanPostProcessor to make Spring beans aware of the current MappingContext. If a MappingContext exists with the
+ * default bean name ("mappingContext"), then that bean is used. If there is no MappingContext registered under the
+ * default bean name, then the first MappingContext it finds is the one it chooses.
+ *
+ * @author Jon Brisbin <jbrisbin@vmware.com>
+ */
+public class MappingContextAwareBeanPostProcessor implements BeanPostProcessor, ApplicationContextAware {
+
+	private ApplicationContext applicationContext;
+	private String mappingContextBeanName = "mappingContext";
+	private MappingContext mappingContext;
+
+	public MappingContextAwareBeanPostProcessor() {
+	}
+
+	public MappingContextAwareBeanPostProcessor(MappingContext mappingContext) {
+		this.mappingContext = mappingContext;
+	}
+
+	public String getMappingContextBeanName() {
+		return mappingContextBeanName;
+	}
+
+	public void setMappingContextBeanName(String mappingContextBeanName) {
+		this.mappingContextBeanName = mappingContextBeanName;
+	}
+
+	@Override
+	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+		this.applicationContext = applicationContext;
+	}
+
+	@Override
+	public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
+		return bean;
+	}
+
+	@Override
+	public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
+		if (bean instanceof MappingContextAware) {
+			if (null == mappingContext) {
+				Map<String, MappingContext> mappingContexts = applicationContext.getBeansOfType(MappingContext.class);
+				if (mappingContexts.containsKey(mappingContextBeanName)) {
+					this.mappingContext = mappingContexts.get(mappingContextBeanName);
+				} else {
+					String firstBean = mappingContexts.keySet().iterator().next();
+					this.mappingContext = applicationContext.getBean(firstBean, MappingContext.class);
+				}
+			}
+			((MappingContextAware) bean).setMappingContext(mappingContext);
+		}
+		return bean;
+	}
+}