/*******************************************************************************
* Copyright (c) 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.wst.sse.core.internal.encoding.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
/**
* This is a pretty limited implementation, sort of specific
* to the way its used by tokenizers (JFlex). To really
* be general purpose, would need more work.
*
*/
public class BufferedLimitedReader extends BufferedReader {
private int limitedCount;
private int nRead;
public BufferedLimitedReader(Reader reader, int size) {
super(reader, size);
if (reader.markSupported()) {
try {
mark(size);
}
catch (IOException e) {
// impossible
e.printStackTrace();
}
}
limitedCount = size;
}
public int read() throws IOException {
int result = 0;
nRead++;
if (nRead > limitedCount) {
result = -1;
}
else {
result = super.read();
}
return result;
}
public int read(char cbuf[], int off, int len) throws IOException {
int result = 0;
if (nRead + len > limitedCount) {
result = -1;
}
else {
result = super.read(cbuf, off, len);
nRead = nRead + result;
}
return result;
}
}