DomainObject.java

/*
 * Copyright 2011 SURFnet bv, The Netherlands
 *
 * 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 nl.surfnet.coin.shared.domain;

import java.io.Serializable;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.MappedSuperclass;

/**
 * Base domain object
 */

@SuppressWarnings("serial")
@MappedSuperclass
public abstract class DomainObject implements Serializable {

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

  /**
   * The id.
   */
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#equals(java.lang.Object)
   */
  @Override
  public boolean equals(Object other) {
    if (this == other) {
      return true;
    }
    if (other == null || !getClass().equals(other.getClass())
        || !(other instanceof DomainObject)) {
      return false;
    }
    DomainObject domainObject = (DomainObject) other;
    if (id == null && domainObject.id == null) {
      return super.equals(domainObject);
    }
    if ((id != null && domainObject.id == null)
        || (id == null && domainObject.id != null)) {
      return false;
    }
    return id.equals(domainObject.id);
  }

  /**
   * @return the id
   */
  public Long getId() {
    return id;
  }

  /**
   * @param id
   *          the id to set
   */
  public void setId(Long id) {
    this.id = id;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return getClass() + "(id='" + id + "')";
  }

}