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/* Copyright (c) 2001-2004, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, 
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb;

import java.io.Serializable;

/**
 * Represents of an instance of an OTHER field value. 

* * Prior to 1.7.0 there were problems storing Objects of normal column types * in columns of the type OTHER. In 1.7.0 changes were made to allow this, * but as all the conversion took place inside the engine, it introduced a * requirement for all classes for objects stored in OTHER columns to be * available on the runtime class path of the engine.

* * In 1.7.2, the introduction of real preprared statement support allows us * revert to the pre 1.7.0 behaviour without the artificial limitations.

* * The classes for stored objects need not be available to open and operate * the database in general. The classes need to be available only if a * conversion from one of these objects to another type is performed inside * the engine while operating the database. * * The current limitation is that in SQL statements, values of type String * (CHARACTER and related SQL types) cannot be stored in columns of type * OTHER. This limitation does not exist for String values assigned to * PreparedStatement variables. * * @author fredt@users * @version 1.7.2 * @since 1.7.2 */ public class JavaObject { private byte[] data; /** * Constructor used inside the engine when an already serialized * Object is read from a file (.log, .script, .data or text table source). */ public JavaObject(byte[] data) { this.data = data; } /** * Constructor used inside the engine to convert an Object into an * object of type OTHER. * Used also with JDBC setParameter(). * If parameter serialize is true, the Object is serialized for storage. */ public JavaObject(Serializable o) throws HsqlException { data = Column.serialize(o); } public byte[] getBytes() throws HsqlException { return data; } public int getBytesLength() throws HsqlException { return data.length; } /** * This method is called from classes implementing the JDBC * interfaces. Inside the engine it is used for conversion from a value of * type OTHER to another type. It will throw if the OTHER is an instance * of a classe that is not available. */ public Serializable getObject() throws HsqlException { return Column.deserialize(data); } /** * Returns String repsentation of this object. * * @return a String represntation of this object. */ public String toString() { return super.toString(); } }

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