/*

 * Copyright 2003-2006 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.sql.rowset.serial;

import java.sql.*;

import java.io.*;

import java.util.Map;

import java.lang.reflect.*;

import javax.sql.rowset.RowSetWarning;

/**

 * A serializable mapping in the Java programming language of an SQL

 * <code>JAVA_OBJECT</code> value. Assuming the Java object

 * implements the <code>Serializable</code> interface, this class simply wraps the

 * serialization process.

 * <P>

 * If however, the serialization is not possible because

 * the Java object is not immediately serializable, this class will

 * attempt to serialize all non-static members to permit the object

 * state to be serialized.

 * Static or transient fields cannot be serialized; an attempt to serialize

 * them will result in a <code>SerialException</code> object being thrown.

 *

 * @author Jonathan Bruce

 */

public class SerialJavaObject implements Serializable, Cloneable {

    /**

     * Placeholder for object to be serialized.

     */

    private Object obj;

   /**

    * Placeholder for all fields in the <code>JavaObject</code> being serialized.

    */

    private transient Field[] fields;

    /**

     * Constructor for <code>SerialJavaObject</code> helper class.

     * <p>

     *

     * @param obj the Java <code>Object</code> to be serialized

     * @throws SerialException if the object is found

     * to be unserializable

     */

    public SerialJavaObject(Object obj) throws SerialException {

        // if any static fields are found, an exception

        // should be thrown

        // get Class. Object instance should always be available

        Class c = obj.getClass();

        // determine if object implements Serializable i/f

        boolean serializableImpl = false;

        Class[] theIf = c.getInterfaces();

        for (int i = 0; i < theIf.length; i++) {

            String ifName = theIf[i].getName();

            if (ifName == "java.io.Serializable") {

                serializableImpl = true;

            }

        }

        // can only determine public fields (obviously). If

        // any of these are static, this should invalidate

        // the action of attempting to persist these fields

        // in a serialized form

        boolean anyStaticFields = false;

        fields = c.getFields();

        //fields = new Object[field.length];

        for (int i = 0; i < fields.length; i++ ) {

            if ( fields[i].getModifiers() == Modifier.STATIC ) {

                anyStaticFields = true;

            }

            //fields[i] = field[i].get(obj);

        }

        try {

            if (!(serializableImpl)) {

               throw new RowSetWarning("Test");

            }

        } catch (RowSetWarning w) {

            setWarning(w);

        }

        if (anyStaticFields) {

            throw new SerialException("Located static fields in " +

                "object instance. Cannot serialize");

        }

        this.obj = obj;

    }

    /**

     * Returns an <code>Object</code> that is a copy of this <code>SerialJavaObject</code>

     * object.

     *

     * @return a copy of this <code>SerialJavaObject</code> object as an

     *         <code>Object</code> in the Java programming language

     * @throws SerialException if the instance is corrupt

     */

    public Object getObject() throws SerialException {

        return this.obj;

    }

    /**

     * Returns an array of <code>Field</code> objects that contains each

     * field of the object that this helper class is serializing.

     *

     * @return an array of <code>Field</code> objects

     * @throws SerialException if an error is encountered accessing

     * the serialized object

     */

    public Field[] getFields() throws SerialException {

        if (fields != null) {

            Class c = this.obj.getClass();

            //the following has to be commented before mustang integration

            //return c.getFields();

            //the following has to be uncommented before mustang integration

            return sun.reflect.misc.FieldUtil.getFields(c);

        } else {

            throw new SerialException("SerialJavaObject does not contain" +

                " a serialized object instance");

        }

    }

    /**

         * The identifier that assists in the serialization of this

     * <code>SerialJavaObject</code> object.

     */

    static final long serialVersionUID = -1465795139032831023L;

    /**

     * A container for the warnings issued on this <code>SerialJavaObject</code>

     * object. When there are multiple warnings, each warning is chained to the

     * previous warning.

     */

    java.util.Vector chain;

    /**

     * Registers the given warning.

     */

    private void setWarning(RowSetWarning e) {

        if (chain == null) {

            chain = new java.util.Vector();

        }

        chain.add(e);

    }

}