| /* |
| * Copyright (C) 2010, 2013 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; |
| |
| /** |
| * Input stream that copies data read to another output stream. |
| * |
| * This stream is primarily useful with a |
| * {@link org.eclipse.jgit.util.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 org.eclipse.jgit.util.TemporaryBuffer}. |
| */ |
| public TeeInputStream(InputStream src, OutputStream dst) { |
| this.src = src; |
| this.dst = dst; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int read() throws IOException { |
| byte[] b = skipBuffer(); |
| int n = read(b, 0, 1); |
| return n == 1 ? b[0] & 0xff : -1; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public long skip(long count) throws IOException { |
| long skipped = 0; |
| long cnt = count; |
| final byte[] b = skipBuffer(); |
| while (0 < cnt) { |
| final 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; |
| } |
| |
| /** {@inheritDoc} */ |
| @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, n); |
| return n; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| 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; |
| } |
| } |