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/*
* Copyright (c) 2004 - 2012 Eike Stepper (Berlin, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.net4j.util.io;
import java.io.IOException;
import java.io.Reader;
/**
* @author Eike Stepper
* @since 3.1
*/
public class LimitedReader extends Reader
{
private Reader in;
private long remaining;
private long remainingAtMark = 0;
public LimitedReader(Reader in, long length)
{
this.in = in;
remaining = length;
}
@Override
public int read() throws IOException
{
if ((remaining -= 1) < 0)
{
return -1;
}
return in.read();
}
@Override
public int read(char[] cbuf, int off, int len) throws IOException
{
if (remaining <= 0)
{
return -1;
}
if (len > remaining)
{
len = (int)remaining;
}
len = in.read(cbuf, off, len);
if (len > 0)
{
remaining -= len;
}
else
{
remaining -= remaining;
}
return len;
}
@Override
public long skip(long n) throws IOException
{
if (n > remaining)
{
n = remaining;
}
remaining -= n = in.skip(n);
return n;
}
@Override
public boolean markSupported()
{
return in.markSupported();
}
@Override
public void mark(int readlimit) throws IOException
{
if (markSupported())
{
in.mark(readlimit);
remainingAtMark = remaining;
}
}
@Override
public void reset() throws IOException
{
in.reset();
remaining = remainingAtMark;
}
@Override
public void close() throws IOException
{
remaining = 0;
in.close();
}
}
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