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/*
* Copyright (C) 2010, Google Inc.
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.util.io;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.eclipse.jgit.util.TemporaryBuffer;
/**
* Input stream that copies data read to another output stream.
*
* This stream is primarily useful with a {@link TemporaryBuffer}, where any
* data read or skipped by the caller is also duplicated into the temporary
* buffer. Later the temporary buffer can then be used instead of the original
* source stream.
*
* During close this stream copies any remaining data from the source stream
* into the destination stream.
*/
public class TeeInputStream extends InputStream {
private byte[] skipBuffer;
private InputStream src;
private OutputStream dst;
/**
* Initialize a tee input stream.
*
* @param src
* source stream to consume.
* @param dst
* destination to copy the source to as it is consumed. Typically
* this is a {@link TemporaryBuffer}.
*/
public TeeInputStream(InputStream src, OutputStream dst) {
this.src = src;
this.dst = dst;
}
@Override
public int read() throws IOException {
byte[] b = skipBuffer();
int n = read(b, 0, 1);
return n == 1 ? b[0] & 0xff : -1;
}
@Override
public long skip(long cnt) throws IOException {
long skipped = 0;
byte[] b = skipBuffer();
while (0 < cnt) {
int n = src.read(b, 0, (int) Math.min(b.length, cnt));
if (n <= 0)
break;
dst.write(b, 0, n);
skipped += n;
cnt -= n;
}
return skipped;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (len == 0)
return 0;
int n = src.read(b, off, len);
if (0 < n)
dst.write(b, off, len);
return n;
}
public void close() throws IOException {
byte[] b = skipBuffer();
for (;;) {
int n = src.read(b);
if (n <= 0)
break;
dst.write(b, 0, n);
}
dst.close();
src.close();
}
private byte[] skipBuffer() {
if (skipBuffer == null)
skipBuffer = new byte[2048];
return skipBuffer;
}
}
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