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Support for archiving a Git tree in formats such as zip and tar. This is a separate bundle from org.eclipse.jgit to avoid a dependency by the latter on commons-compress.

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/*
 * Copyright (C) 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.archive;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
import org.eclipse.jgit.api.ArchiveCommand;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectLoader;

/**
 * gzip-compressed tarball (tar.gz) format.
 */
public final class TgzFormat implements ArchiveCommand.Format {
	private static final List SUFFIXES = Collections
			.unmodifiableList(Arrays.asList(".tar.gz", ".tgz")); //$NON-NLS-1$ //$NON-NLS-2$

	private final ArchiveCommand.Format tarFormat = new TarFormat();

	public ArchiveOutputStream createArchiveOutputStream(OutputStream s)
			throws IOException {
		GzipCompressorOutputStream out = new GzipCompressorOutputStream(s);
		return tarFormat.createArchiveOutputStream(out);
	}

	public void putEntry(ArchiveOutputStream out,
			String path, FileMode mode, ObjectLoader loader)
			throws IOException {
		tarFormat.putEntry(out, path, mode, loader);
	}

	public Iterable suffixes() {
		return SUFFIXES;
	}

	@Override
	public boolean equals(Object other) {
		return (other instanceof TgzFormat);
	}

	@Override
	public int hashCode() {
		return getClass().hashCode();
	}
}