DATACMNS-127 - Added DelegatingEntityInformation.

spring-data-commons-core/src/main/java/org/springframework/data/repository/core/support/DelegatingEntityInformation.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 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.data.repository.core.support;
+
+import java.io.Serializable;
+
+import org.springframework.data.repository.core.EntityInformation;
+import org.springframework.util.Assert;
+
+/**
+ * Useful base class to implement custom {@link EntityInformation}s and delegate execution of standard methods from
+ * {@link EntityInformation} to a special implementation.
+ * 
+ * @author Oliver Gierke
+ */
+public class DelegatingEntityInformation<T, ID extends Serializable> implements EntityInformation<T, ID> {
+
+	private final EntityInformation<T, ID> delegate;
+
+	/**
+	 * Creates a new {@link DelegatingEntityInformation} delegating method invocations to the given
+	 * {@link EntityInformation}.
+	 * 
+	 * @param delegate
+	 */
+	public DelegatingEntityInformation(EntityInformation<T, ID> delegate) {
+
+		Assert.notNull(delegate);
+		this.delegate = delegate;
+	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.core.EntityMetadata#getJavaType()
+	 */
+	public Class<T> getJavaType() {
+		return delegate.getJavaType();
+	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.core.EntityInformation#isNew(java.lang.Object)
+	 */
+	public boolean isNew(T entity) {
+		return delegate.isNew(entity);
+	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.core.EntityInformation#getId(java.lang.Object)
+	 */
+	public ID getId(T entity) {
+		return delegate.getId(entity);
+	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.repository.core.EntityInformation#getIdType()
+	 */
+	public Class<ID> getIdType() {
+		return delegate.getIdType();
+	}
+}