/*
 * GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library 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 library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Nov 13, 2005
 */
package com.nvarghese.beowulf.common.cobra.html.io;

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;

public class WritableLineReader extends LineNumberReader {

	private final Reader delegate;

	public WritableLineReader(Reader reader, int bufferSize) {

		super(reader, bufferSize);
		this.delegate = reader;
	}

	public WritableLineReader(Reader reader) {

		super(reader);
		this.delegate = reader;
	}

	/*
	 * Note: Not implicitly thread safe.
	 */
	public int read() throws IOException {

		StringBuffer sb = this.writeBuffer;
		if (sb != null && sb.length() > 0) {
			char ch = sb.charAt(0);
			sb.deleteCharAt(0);
			if (sb.length() == 0) {
				this.writeBuffer = null;
			}
			return (int) ch;
		}
		return super.read();
	}

	/*
	 * (non-Javadoc) Note: Not implicitly thread safe.
	 * 
	 * @see java.io.Reader#read(byte[], int, int)
	 */
	public int read(char[] b, int off, int len) throws IOException {

		StringBuffer sb = this.writeBuffer;
		if (sb != null && sb.length() > 0) {
			int srcEnd = Math.min(sb.length(), len);
			sb.getChars(0, srcEnd, b, off);
			sb.delete(0, srcEnd);
			if (sb.length() == 0) {
				this.writeBuffer = null;
			}
			return srcEnd;
		}
		return super.read(b, off, len);
	}

	public boolean ready() throws IOException {

		StringBuffer sb = this.writeBuffer;
		if (sb != null && sb.length() > 0) {
			return true;
		}
		return super.ready();
	}

	/*
	 * (non-Javadoc) Note: Not implicitly thread safe.
	 * 
	 * @see java.io.Reader#close()
	 */
	public void close() throws IOException {

		this.writeBuffer = null;
		super.close();
	}

	private StringBuffer writeBuffer = null;

	/**
	 * Note: Not implicitly thread safe.
	 * 
	 * @param text
	 * @throws IOException
	 */
	public void write(String text) throws IOException {

		// Document overrides this to know that new data is coming.
		StringBuffer sb = this.writeBuffer;
		if (sb == null) {
			sb = new StringBuffer();
			this.writeBuffer = sb;
		}
		sb.append(text);
	}
}