/*
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 org.lobobrowser.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(final Reader reader, final int bufferSize) {
super(reader, bufferSize);
this.delegate = reader;
}
public WritableLineReader(final Reader reader) {
super(reader);
this.delegate = reader;
}
/*
* Note: Not implicitly thread safe.
*/
@Override
public int read() throws IOException {
final StringBuffer sb = this.writeBuffer;
if ((sb != null) && (sb.length() > 0)) {
final char ch = sb.charAt(0);
sb.deleteCharAt(0);
if (sb.length() == 0) {
this.writeBuffer = null;
}
return ch;
}
return super.read();
}
/*
* (non-Javadoc) Note: Not implicitly thread safe.
*
* @see java.io.Reader#read(byte[], int, int)
*/
@Override
public int read(final char[] b, final int off, final int len) throws IOException {
final StringBuffer sb = this.writeBuffer;
if ((sb != null) && (sb.length() > 0)) {
final 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);
}
@Override
public boolean ready() throws IOException {
final 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()
*/
@Override
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(final 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);
}
}