/*
 * 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.rest.webmvc.gemfire;

import org.springframework.data.annotation.Id;

/**
 * Base class for persistent classes.
 * 
 * @author Oliver Gierke
 * @author David Turanski
 */
public class AbstractPersistentEntity {

	@Id private final Long id;

	/**
	 * Returns the identifier of the entity.
	 * 
	 * @return the id
	 */
	public Long getId() {
		return id;
	}

	protected AbstractPersistentEntity(Long id) {
		this.id = id;
	}

	protected AbstractPersistentEntity() {
		this.id = null;
	}

	/* 
	 * (non-Javadoc)
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {

		if (this == obj) {
			return true;
		}

		if (this.id == null || obj == null || !(this.getClass().equals(obj.getClass()))) {
			return false;
		}

		AbstractPersistentEntity that = (AbstractPersistentEntity) obj;

		return this.id.equals(that.getId());
	}

	/* 
	 * (non-Javadoc)
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode() {
		return id == null ? 0 : id.hashCode();
	}
}
