edu.nju.cs.inform.jgit.porcelain.CreateCustomFormatArchive.java Source code

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Here is the source code for edu.nju.cs.inform.jgit.porcelain.CreateCustomFormatArchive.java

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package edu.nju.cs.inform.jgit.porcelain;

/*
 * Copyright 2013, 2014 Dominik Stadler
 *
 * 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.
 */

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import edu.nju.cs.inform.jgit.helper.CookbookHelper;
import org.eclipse.jgit.api.ArchiveCommand;
import org.eclipse.jgit.api.ArchiveCommand.Format;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.FileMode;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.Repository;

/**
 * Simple snippet which shows how to package the contents of a branch into an archive file
 * using a custom compression format.
 *
 * @author dominik.stadler at gmx.at
 */
public class CreateCustomFormatArchive {

    /**
     * A custom format for Zip-files, unfortunately JGit does not come with any pre-defined ones
     */
    private static final class ZipArchiveFormat implements Format<ZipOutputStream> {

        @Override
        public ZipOutputStream createArchiveOutputStream(OutputStream s) throws IOException {
            return new ZipOutputStream(s);
        }

        @Override
        public void putEntry(ZipOutputStream out, String path, FileMode mode, ObjectLoader loader)
                throws IOException {
            // loader is null for directories...
            if (loader != null) {
                ZipEntry entry = new ZipEntry(path);
                out.putNextEntry(entry);
                out.write(loader.getBytes());
                out.closeEntry();
            }
        }

        @Override
        public Iterable<String> suffixes() {
            return Collections.singleton(".mzip");
        }

        @Override
        public ZipOutputStream createArchiveOutputStream(OutputStream s, Map<String, Object> o) throws IOException {
            return new ZipOutputStream(s);
        }
    }

    public static void main(String[] args) throws IOException, GitAPIException {
        try (Repository repository = CookbookHelper.openJGitCookbookRepository()) {
            File file = File.createTempFile("test", ".mzip");
            // make the archive format known
            ArchiveCommand.registerFormat("myzip", new ZipArchiveFormat());
            try {
                // this is the file that we write the archive to
                try (OutputStream out = new FileOutputStream(file)) {
                    // finally call the ArchiveCommand to write out using the given format
                    try (Git git = new Git(repository)) {
                        git.archive().setTree(repository.resolve("master")).setFormat("myzip").setOutputStream(out)
                                .call();
                    }
                }
            } finally {
                ArchiveCommand.unregisterFormat("myzip");
            }

            System.out.println("Wrote " + file.length() + " bytes to " + file);
        }
    }
}