customtype.java

介绍了hibernate的入门有一些基本常用的事例

//$Id: CustomType.java,v 1.16 2005/03/16 04:45:25 oneovthafew Exp $
package org.hibernate.type;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Comparator;
import java.util.Map;
import java.util.Properties;

import org.dom4j.Node;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.engine.Mapping;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.usertype.EnhancedUserType;
import org.hibernate.usertype.ParameterizedType;
import org.hibernate.usertype.UserType;
import org.hibernate.usertype.UserVersionType;

/**
 * Adapts <tt>UserType</tt> to the generic <tt>Type</tt> interface.
 *
 * @see org.hibernate.usertype.UserType
 * @author Gavin King
 */
public class CustomType extends AbstractType implements IdentifierType, DiscriminatorType, VersionType {

	private final UserType userType;
	private final String name;
	private final int[] types;

	public CustomType(Class userTypeClass, Properties parameters) throws MappingException {

		name = userTypeClass.getName();

		if ( !UserType.class.isAssignableFrom(userTypeClass) ) {
			throw new MappingException( "Custom type does not implement UserType: " + userTypeClass.getName() );
		}
		
		try {
			userType = (UserType) userTypeClass.newInstance();
		}
		catch (InstantiationException ie) {
			throw new MappingException( "Cannot instantiate custom type: " + userTypeClass.getName() );
		}
		catch (IllegalAccessException iae) {
			throw new MappingException( "IllegalAccessException trying to instantiate custom type: " + userTypeClass.getName() );
		}

		types = userType.sqlTypes();

		/*if ( !Serializable.class.isAssignableFrom( userType.returnedClass() ) ) {
			LogFactory.getLog(CustomType.class).warn("custom type does not implement Serializable: " + userTypeClass);
		}*/

		if (userType instanceof ParameterizedType) {
			( (ParameterizedType) userType ).setParameterValues(parameters);
		}
		else if ( parameters!=null && !parameters.isEmpty() ) {
			throw new MappingException( "composite user type is not parameterized: " + userTypeClass.getName() );
		}
	}

	public int[] sqlTypes(Mapping pi) {
		return types;
	}

	public int getColumnSpan(Mapping session) {
		return types.length;
	}

	public Class getReturnedClass() {
		return userType.returnedClass();
	}

	public boolean isEqual(Object x, Object y) throws HibernateException {
		return userType.equals(x, y);
	}

	public boolean isEqual(Object x, Object y, EntityMode entityMode) throws HibernateException {
		return isEqual(x, y);
	}

	public int getHashCode(Object x, EntityMode entityMode) {
		return userType.hashCode(x);
	}
	
	public Object nullSafeGet(
		ResultSet rs,
		String[] names,
		SessionImplementor session,
		Object owner
	) throws HibernateException, SQLException {

		return userType.nullSafeGet(rs, names, owner);
	}

	public Object nullSafeGet(
		ResultSet rs,
		String columnName,
		SessionImplementor session,
		Object owner
	) throws HibernateException, SQLException {
		return nullSafeGet(rs, new String[] { columnName }, session, owner);
	}


	public Object assemble(Serializable cached, SessionImplementor session, Object owner) 
	throws HibernateException {
		return userType.assemble(cached, owner);
	}

	public Serializable disassemble(Object value, SessionImplementor session, Object owner)
	throws HibernateException {
		return userType.disassemble(value);
	}

	public Object replace(
			Object original, 
			Object target,
			SessionImplementor session, 
			Object owner, 
			Map copyCache)
	throws HibernateException {
		return userType.replace(original, target, owner);
	}
	
	public void nullSafeSet(
		PreparedStatement st,
		Object value,
		int index,
		boolean[] settable, 
		SessionImplementor session
	) throws HibernateException, SQLException {

		userType.nullSafeSet(st, value, index);
	}

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

		userType.nullSafeSet(st, value, index);
	}

	public String toXMLString(Object value, SessionFactoryImplementor factory) {
		if (value==null) return null;
		if (userType instanceof EnhancedUserType) {
			return ( (EnhancedUserType) userType ).toXMLString(value);
		}
		else {
			return value.toString();
		}
	}

	public Object fromXMLString(String xml, Mapping factory) {
		return ( (EnhancedUserType) userType ).fromXMLString(xml);
	}

	public String getName() {
		return name;
	}

	public Object deepCopy(Object value, EntityMode entityMode, SessionFactoryImplementor factory) throws HibernateException {
		return userType.deepCopy(value);
	}

	public boolean isMutable() {
		return userType.isMutable();
	}

	public Object stringToObject(String xml) {
		return ( (EnhancedUserType) userType ).toXMLString(xml);
	}

	public String objectToSQLString(Object value) throws Exception {
		return ( (EnhancedUserType) userType ).objectToSQLString(value);
	}

	public Comparator getComparator() {
		return (Comparator) userType;
	}

	public Object next(Object current) {
		return ( (UserVersionType) userType ).next(current);
	}

	public Object seed() {
		return ( (UserVersionType) userType ).seed();
	}

	public Object fromXMLNode(Node xml, Mapping factory) throws HibernateException {
		return fromXMLString( xml.getText(), factory );
	}

	public void setToXMLNode(Node node, Object value, SessionFactoryImplementor factory) throws HibernateException {
		node.setText( toXMLString(value, factory) );
	}

	public String toLoggableString(Object value, SessionFactoryImplementor factory) throws HibernateException {
		return value==null ? "null" : toXMLString(value, factory);
	}
}