package com.trendmicro.grid.acl.ds.jpa.entities;
   
   import javax.persistence.Column;
   import javax.persistence.Embeddable;
   import javax.persistence.JoinColumn;
   import javax.persistence.ManyToOne;
   import java.io.Serializable;
   
   import static net.sf.tinyjee.util.Assert.assertNotNull;
  
  /**
   * Defines the ID of a history entry.
   */
  @Embeddable
  public class JpaPackageHistoryId implements Serializable {
  
  	private static final long serialVersionUID = -8535664911794270325L;
  
  	@ManyToOne(optional = false)
  	@JoinColumn(name = "PACKAGE_ID", nullable = false, updatable = false)
  	private JpaPackageDetails parent;
  
  	@Column(name = "REVISION", nullable = false, updatable = false)
  	private int revision;
  
  	public JpaPackageHistoryId() {
  	}
  
  	public JpaPackageHistoryId(JpaPackageDetails parent) {
  		assertNotNull("JpaPackageDetails", parent);
  		this.parent = parent;
  		this.revision = parent.getRevision();
  
  		parent.setRevision(parent.getRevision() + 1);
  	}
  
  	public JpaPackageDetails getParent() {
  		return parent;
  	}
  
  	public int getRevision() {
  		return revision;
  	}
  
  	@Override
  	public boolean equals(Object o) {
  		if (this == o) return true;
  		if (!(o instanceof JpaPackageHistoryId)) return false;
  		JpaPackageHistoryId id = (JpaPackageHistoryId) o;
  		return revision == id.revision && parent.equals(id.parent);
  	}
  
  	@Override
  	public int hashCode() {
  		int result = parent.hashCode();
  		result = 31 * result + revision;
  		return result;
  	}
  
  	@Override
  	public String toString() {
  		return "JpaPackageHistoryId{" +
  				"packageDetails=" + parent +
  				", revision=" + revision +
  				'}';
  	}
  }