key.java

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//$Id: Key.java,v 1.7.2.2 2003/08/09 11:24:49 turin42 Exp $
package net.sf.hibernate.engine;

import java.io.Serializable;

import net.sf.hibernate.AssertionFailure;
import net.sf.hibernate.persister.ClassPersister;

/**
 * A globally unique identifier of an instance.
 *
 * Consisting of the user-visible identifier and the identifier space (eg. tablename).
 *
 * @author Gavin King
 */
public final class Key implements Serializable {
	private final Serializable id;
	private final Serializable identifierSpace;
	private final Class clazz;
	
	private Key(Serializable id, Serializable identifierSpace, Class clazz) {
		if (id==null) throw new AssertionFailure("null identifier");
		this.id=id;
		this.identifierSpace = identifierSpace;
		this.clazz = clazz;
	}
	
	/**
	 * Construct a unique identifier for an entity class instance
	 */
	public Key(Serializable id, ClassPersister p) {
		this( id, p.getIdentifierSpace(), p.getMappedClass() );
	}
	
	/**
	 * Get the user-visible identifier
	 */
	public Serializable getIdentifier() {
		return id;
	}
	
	public Class getMappedClass() {
		return clazz;
	}
	
	public boolean equals(Object other) {
		Key otherKey = (Key) other;
		return otherKey.identifierSpace.equals(this.identifierSpace) && otherKey.id.equals(this.id);
	}
	
	public int hashCode() { return id.hashCode(); }
	
	public String toString() {
		return id.toString();
	}
}