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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.io;
import java.io.IOException;
import java.io.PushbackReader;
import java.io.Reader;
import java.nio.CharBuffer;
/**
* Special {@link PushbackReader} implementation which provides the current cursor offset.
* Created: 19.03.2013 21:13:02
* @since 0.5.23
* @author Volker Bergmann
*/
public class OffsetPushbackReader extends PushbackReader {
int offset;
public OffsetPushbackReader(Reader in) {
this(in, 1);
}
public OffsetPushbackReader(Reader in, int pushBackBufferSize) {
super(in, pushBackBufferSize);
this.offset = 0;
}
@Override
public int read() throws IOException {
offset++;
return super.read();
}
@Override
public int read(char[] charBuffer) throws IOException {
int count = super.read(charBuffer);
offset += count;
return count;
}
@Override
public int read(CharBuffer charVuffer) throws IOException {
int count = super.read(charVuffer);
offset += count;
return count;
}
@Override
public void unread(int c) throws IOException {
offset--;
super.unread(c);
}
@Override
public void unread(char[] charBuffer) throws IOException {
offset -= charBuffer.length;
super.unread(charBuffer);
}
@Override
public void unread(char[] charBuffer, int off, int len) throws IOException {
offset -= len;
super.unread(charBuffer, off, len);
}
public int getOffset() {
return offset;
}
}