| /******************************************************************************* |
| * 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; |
| } |
| |
| } |