/*

 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.rowset;

import java.sql.*;

import javax.sql.*;

import java.io.*;

import java.math.*;

import java.util.*;

import java.text.*;

import org.xml.sax.*;

import javax.sql.rowset.*;

import javax.sql.rowset.spi.*;

import com.sun.rowset.providers.*;

import com.sun.rowset.internal.*;

/**

 * The standard implementation of the <code>WebRowSet</code> interface. See the interface

 * definition for full behavior and implementation requirements.

 *

 * @author Jonathan Bruce, Amit Handa

 */

public class WebRowSetImpl extends CachedRowSetImpl implements WebRowSet {

    /**

     * The <code>WebRowSetXmlReader</code> object that this

     * <code>WebRowSet</code> object will call when the method

     * <code>WebRowSet.readXml</code> is invoked.

     */

    private WebRowSetXmlReader xmlReader;

    /**

     * The <code>WebRowSetXmlWriter</code> object that this

     * <code>WebRowSet</code> object will call when the method

     * <code>WebRowSet.writeXml</code> is invoked.

     */

    private WebRowSetXmlWriter xmlWriter;

    /* This stores the cursor position prior to calling the writeXML.

     * This variable is used after the write to restore the position

     * to the point where the writeXml was called.

     */

    private int curPosBfrWrite;

    private SyncProvider provider;

    /**

     * Constructs a new <code>WebRowSet</code> object initialized with the

     * default values for a <code>CachedRowSet</code> object instance. This

     * provides the <code>RIOptimistic</code> provider to deliver

     * synchronization capabilities to relational datastores and a default

     * <code>WebRowSetXmlReader</code> object and a default

     * <code>WebRowSetXmlWriter</code> object to enable XML output

     * capabilities.

     *

     * @throws SQLException if an error occurs in configuring the default

     * synchronization providers for relational and XML providers.

     */

    public WebRowSetImpl() throws SQLException {

        super();

        // %%%

        // Needs to use to SPI  XmlReader,XmlWriters

        //

        xmlReader = new WebRowSetXmlReader();

        xmlWriter = new WebRowSetXmlWriter();

    }

    /**

     * synchronization SPI provider properties as specified in the <code>Hashtable</code>. If

     * this hashtable is empty or is <code>null</code> the default constructor is invoked.

     *

     * @throws SQLException if an error occurs in configuring the specified

     * synchronization providers for the relational and XML providers; or

     * if the Hashtanle is null

     */

    @SuppressWarnings("rawtypes")

    public WebRowSetImpl(Hashtable env) throws SQLException {

        try {

           resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle();

        } catch(IOException ioe) {

            throw new RuntimeException(ioe);

        }

        if ( env == null) {

            throw new SQLException(resBundle.handleGetObject("webrowsetimpl.nullhash").toString());

        }

        String providerName =

            (String)env.get(javax.sql.rowset.spi.SyncFactory.ROWSET_SYNC_PROVIDER);

        // set the Reader, this maybe overridden latter

        provider = SyncFactory.getInstance(providerName);

        // xmlReader = provider.getRowSetReader();

        // xmlWriter = provider.getRowSetWriter();

    }

   /**

    * Populates this <code>WebRowSet</code> object with the

    * data in the given <code>ResultSet</code> object and writes itself

    * to the given <code>java.io.Writer</code> object in XML format.

    * This includes the rowset's data,  properties, and metadata.

    *

    * @throws SQLException if an error occurs writing out the rowset

    *          contents to XML

    */

    public void writeXml(ResultSet rs, java.io.Writer writer)

        throws SQLException {

            // WebRowSetImpl wrs = new WebRowSetImpl();

            this.populate(rs);

            // Store the cursor position before writing

            curPosBfrWrite = this.getRow();

            this.writeXml(writer);

    }

    /**

     * Writes this <code>WebRowSet</code> object to the given

     * <code>java.io.Writer</code> object in XML format. This

     * includes the rowset's data,  properties, and metadata.

     *

     * @throws SQLException if an error occurs writing out the rowset

     *          contents to XML

     */

    public void writeXml(java.io.Writer writer) throws SQLException {

        // %%%

        // This will change to a XmlReader, which over-rides the default

        // Xml that is used when a WRS is instantiated.

        // WebRowSetXmlWriter xmlWriter = getXmlWriter();

        if (xmlWriter != null) {

            // Store the cursor position before writing

            curPosBfrWrite = this.getRow();

            xmlWriter.writeXML(this, writer);

        } else {

            throw new SQLException(resBundle.handleGetObject("webrowsetimpl.invalidwr").toString());

        }

    }

    /**

     * Reads this <code>WebRowSet</code> object in its XML format.

     *

     * @throws SQLException if a database access error occurs

     */

    public void readXml(java.io.Reader reader) throws SQLException {

        // %%%

        // This will change to a XmlReader, which over-rides the default

        // Xml that is used when a WRS is instantiated.

        //WebRowSetXmlReader xmlReader = getXmlReader();

        try {

             if (reader != null) {

                xmlReader.readXML(this, reader);

                // Position is before the first row

                // The cursor position is to be stored while serializng

                // and deserializing the WebRowSet Object.

                if(curPosBfrWrite == 0) {

                   this.beforeFirst();

                }

                // Return the position back to place prior to callin writeXml

                else {

                   this.absolute(curPosBfrWrite);

                }

            } else {

                throw new SQLException(resBundle.handleGetObject("webrowsetimpl.invalidrd").toString());

            }

        } catch (Exception e) {

            throw new SQLException(e.getMessage());

        }

    }

    // Stream based methods

    /**

     * Reads a stream based XML input to populate this <code>WebRowSet</code>

     * object.

     *

     * @throws SQLException if a data source access error occurs

     * @throws IOException if a IO exception occurs

     */

    public void readXml(java.io.InputStream iStream) throws SQLException, IOException {

        if (iStream != null) {

            xmlReader.readXML(this, iStream);

            // Position is before the first row

                // The cursor position is to be stored while serializng

                // and deserializing the WebRowSet Object.

                if(curPosBfrWrite == 0) {

                   this.beforeFirst();

                }

                // Return the position back to place prior to callin writeXml

                else {

                   this.absolute(curPosBfrWrite);

                }

        } else {

            throw new SQLException(resBundle.handleGetObject("webrowsetimpl.invalidrd").toString());

        }

    }

    /**

     * Writes this <code>WebRowSet</code> object to the given <code> OutputStream</code>

     * object in XML format.

     * <code>WebRowSet</code> for XML proceessing

     *

     * @throws SQLException if a datasource access error occurs

     * @throws IOException if an IO exception occurs

     */

    public void writeXml(java.io.OutputStream oStream) throws SQLException, IOException {

        if (xmlWriter != null) {

            // Store the cursor position before writing

            curPosBfrWrite = this.getRow();

            xmlWriter.writeXML(this, oStream);

        } else {

            throw new SQLException(resBundle.handleGetObject("webrowsetimpl.invalidwr").toString());

        }

    }

    /**

     * Populates this <code>WebRowSet</code> object with the

     * data in the given <code>ResultSet</code> object and writes itself

     * to the given <code>java.io.OutputStream</code> object in XML format.

     * This includes the rowset's data,  properties, and metadata.

     *

     * @throws SQLException if a datasource access error occurs

     * @throws IOException if an IO exception occurs

     */

    public void writeXml(ResultSet rs, java.io.OutputStream oStream) throws SQLException, IOException {

            this.populate(rs);

            // Store the cursor position before writing

            curPosBfrWrite = this.getRow();

            this.writeXml(oStream);

    }

    /**

     * This method re populates the resBundle

     * during the deserialization process

     *

     */

    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {

        // Default state initialization happens here

        ois.defaultReadObject();

        // Initialization of transient Res Bundle happens here .

        try {

           resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle();

        } catch(IOException ioe) {

            throw new RuntimeException(ioe);

        }

    }

    static final long serialVersionUID = -8771775154092422943L;

}