/*
 * Copyright (c) 2003, Rafael Steil
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above 
 * copyright notice, this list of conditions and the 
 * following  disclaimer.
 * 2)  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.
 * 3) Neither the name of "Rafael Steil" 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 
 * THE COPYRIGHT OWNER 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
 * 
 * Created on Jan 26, 2005 4:42:44 PM
 * The JForum Project
 * http://www.jforum.net
 */
package net.jforum.drivers.oracle;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import net.jforum.JForum;

/**
 * @author Rafael Steil
 * @version $Id: OracleUtils.java,v 1.1 2005/01/26 20:15:09 rafaelsteil Exp $
 */
public class OracleUtils
{
	public static String readBlobUTF16BinaryStream(ResultSet rs, String fieldName) throws IOException, SQLException
	{
		Blob clob = rs.getBlob(fieldName);

		InputStream is = clob.getBinaryStream();
		StringBuffer sb = new StringBuffer();
		int readedBytes = 0;
		int bufferSize = 4096;

		do {
			byte[] bytes = new byte[bufferSize];
			readedBytes = is.read(bytes);
			if (readedBytes > 0) {
				String readed = new String(bytes, 0, readedBytes, "UTF-16");
				sb.append(readed);
			}
		} while (readedBytes == bufferSize);

		is.close();

		return sb.toString();
	}

	/**
	 * The query should look like:
	 * 
	 * SELECT blob_field from any_table WHERE id = ? FOR UPDATE
	 * 
	 * BUT KEEP IN MIND:
	 * 
	 * When you insert record in previous step, it should go with empty_blob() like:
	 * 
	 * INSERT INTO jforum_posts_text ( post_text ) VALUES (EMPTY_BLOB())
	 * 
	 * @param query
	 * @param idForQuery
	 * @param value
	 * @throws IOException
	 * @throws SQLException
	 */
	public static void writeBlobUTF16BinaryStream(String query, int idForQuery, String value) throws IOException,
			SQLException
	{
		PreparedStatement p = JForum.getConnection().prepareStatement(query);
		p.setInt(1, idForQuery);

		ResultSet rs = p.executeQuery();
		rs.next();
		Blob postText = rs.getBlob(1);

		OutputStream blobWriter = ((oracle.sql.BLOB) postText).getBinaryOutputStream();
		blobWriter.write(value.getBytes("UTF-16"));

		blobWriter.close();
		rs.close();
		p.close();
	}
}