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Hibernate example source code file (SerializableToBlobType.java)

This example Hibernate source code file (SerializableToBlobType.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

class, class_name, hibernateexception, hibernateexception, io, jdbc, mapping, mappingexception, object, object, override, serializabletype, sessionfactoryimplementor, sessionfactoryimplementor, sql, string, string, util

The Hibernate SerializableToBlobType.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.type;

import java.io.ByteArrayInputStream;
import java.io.Serializable;
import java.sql.Blob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Map;
import java.util.Properties;

import org.dom4j.Node;

import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.engine.spi.Mapping;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.util.ReflectHelper;
import org.hibernate.internal.util.SerializationHelper;
import org.hibernate.usertype.ParameterizedType;

/**
 * @author Emmanuel Bernard
 */
public class SerializableToBlobType extends AbstractLobType implements ParameterizedType {
	/**
	 * class name of the serialisable class
	 */
	public static final String CLASS_NAME = "classname";
	private Class serializableClass;
	private SerializableType type;

	public int[] sqlTypes(Mapping mapping) throws MappingException {
		return new int[]{Types.BLOB};
	}

	public Class getReturnedClass() {
		return serializableClass;
	}

	@Override
	public boolean isEqual(Object x, Object y, SessionFactoryImplementor factory) {
		return type.isEqual( x, y );
	}


	@Override
	public int getHashCode(Object x, SessionFactoryImplementor session) {
		return type.getHashCode( x );
	}

	public Object get(ResultSet rs, String name) throws SQLException {
		Blob blob = rs.getBlob( name );
		if ( rs.wasNull() ) return null;
		int length = (int) blob.length();
		byte[] primaryResult = blob.getBytes( 1, length );
		return fromBytes( primaryResult );
	}

	private static byte[] toBytes(Object object) throws SerializationException {
		return SerializationHelper.serialize( (Serializable) object );
	}

	private Object fromBytes(byte[] bytes) throws SerializationException {
		return SerializationHelper.deserialize( bytes, getReturnedClass().getClassLoader() );
	}

	public void set(PreparedStatement st, Object value, int index, SessionImplementor session) throws SQLException {
		if ( value != null ) {
			byte[] toSet;
			toSet = toBytes( value );
			if ( session.getFactory().getDialect().useInputStreamToInsertBlob() ) {
				st.setBinaryStream( index, new ByteArrayInputStream( toSet ), toSet.length );
			}
			else {
				st.setBlob( index, Hibernate.getLobCreator( session ).createBlob( toSet ) );
			}
		}
		else {
			st.setNull( index, sqlTypes( null )[0] );
		}
	}

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

	public String toLoggableString(Object value, SessionFactoryImplementor factory) throws HibernateException {
		return type.toLoggableString( value, factory );
	}

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

	public Object deepCopy(Object value, SessionFactoryImplementor factory)
			throws HibernateException {
		return type.deepCopy( value, null );
	}

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

	public Object replace(Object original, Object target, SessionImplementor session, Object owner, Map copyCache)
			throws HibernateException {
		return type.replace( original, target, session, owner, copyCache );
	}

	public boolean[] toColumnNullness(Object value, Mapping mapping) {
		return type.toColumnNullness( value, mapping );
	}

	public void setParameterValues(Properties parameters) {
		if ( parameters != null ) {
			String className = parameters.getProperty( CLASS_NAME );
			if ( className == null ) {
				throw new MappingException(
						"No class name defined for type: " + SerializableToBlobType.class.getName()
				);
			}
			try {
				serializableClass = ReflectHelper.classForName( className );
			}
			catch (ClassNotFoundException e) {
				throw new MappingException( "Unable to load class from " + CLASS_NAME + " parameter", e );
			}
		}
		type = new SerializableType( serializableClass );
	}
}

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