multiplicitytype.java

介绍了hibernate的入门有一些基本常用的事例

//$Id: MultiplicityType.java,v 1.2 2005/04/03 03:56:22 oneovthafew Exp $
package org.hibernate.test.legacy;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.engine.ForeignKeys;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.type.Type;
import org.hibernate.usertype.CompositeUserType;

public class MultiplicityType implements CompositeUserType {

	private static final String[] PROP_NAMES = new String[] {
		"count", "glarch"
	};
	private static final int[] SQL_TYPES = new int[] {
		Hibernate.INTEGER.sqlType(), Hibernate.STRING.sqlType()
	};
	private static final Type[] TYPES = new Type[] {
		Hibernate.INTEGER, Hibernate.entity(Glarch.class)
	};

	public String[] getPropertyNames() {
		return PROP_NAMES;
	}

	public Type[] getPropertyTypes() {
		return TYPES;
	}

	public int hashCode(Object x) throws HibernateException {
		Multiplicity o = (Multiplicity) x;
		return o.count + o.glarch.hashCode();
	}

	public Object getPropertyValue(Object component, int property) {
		Multiplicity o = (Multiplicity) component;
		return property==0 ?
			(Object) new Integer(o.count) :
			(Object) o.glarch;
	}

	public void setPropertyValue(
		Object component,
		int property,
		Object value) {

		Multiplicity o = (Multiplicity) component;
		if (property==0) {
			o.count = ( (Integer) value ).intValue();
		}
		else {
			o.glarch = (Glarch) value;
		}
	}

	public int[] sqlTypes() {
		return SQL_TYPES;
	}

	public Class returnedClass() {
		return Multiplicity.class;
	}

	public boolean equals(Object x, Object y) {
		Multiplicity mx = (Multiplicity) x;
		Multiplicity my = (Multiplicity) y;
		if (mx==my) return true;
		if (mx==null || my==null) return false;
		return mx.count==my.count && mx.glarch==my.glarch;
	}

	public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner)
		throws HibernateException, SQLException {

		Integer c = (Integer) Hibernate.INTEGER.nullSafeGet( rs, names[0] );
		GlarchProxy g = (GlarchProxy) Hibernate.entity(Glarch.class).nullSafeGet(rs, names[1], session, owner);
		Multiplicity m = new Multiplicity();
		m.count = c==null ? 0 : c.intValue();
		m.glarch = g;
		return m;
	}

	public void nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session)
		throws HibernateException, SQLException {

		Multiplicity o = (Multiplicity) value;
		GlarchProxy g;
		Integer c;
		if (o==null) {
			g=null;
			c=new Integer(0);
		}
		else {
			g = o.glarch;
			c = new Integer(o.count);
		}
		Hibernate.INTEGER.nullSafeSet(st, c, index, session);
		Hibernate.entity(Glarch.class).nullSafeSet(st, g, index+1, session);

	}

	public Object deepCopy(Object value) {
		if (value==null) return null;
		Multiplicity v = (Multiplicity) value;
		Multiplicity m = new Multiplicity();
		m.count = v.count;
		m.glarch = v.glarch;
		return m;
	}

	public boolean isMutable() {
		return true;
	}

	public Object assemble(
		Serializable cached,
		SessionImplementor session,
		Object owner) throws HibernateException {
		if (cached==null) return null;
		Serializable[] o = (Serializable[]) cached;
		Multiplicity m = new Multiplicity();
		m.count = ( (Integer) o[0] ).intValue();
		m.glarch = o[1]==null ? null : (GlarchProxy) session.internalLoad( Glarch.class.getName(), o[1], false );
		return m;
	}

	public Serializable disassemble(Object value, SessionImplementor session)
	throws HibernateException {
		if (value==null) return null;
		Multiplicity m = (Multiplicity) value;
		return new Serializable[] { 
				new Integer(m.count), 
				ForeignKeys.getEntityIdentifierIfNotUnsaved( Glarch.class.getName(), m.glarch, session ) 
		};
	}

	public Object replace(Object original, Object target, SessionImplementor session, Object owner) 
	throws HibernateException {
		return assemble( disassemble(original, session), session, owner);
	}
	
}