org.apache.whirr.util.Tarball.java Source code

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Here is the source code for org.apache.whirr.util.Tarball.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.whirr.util;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;
import org.apache.commons.io.IOUtils;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Tarball utility.
 */
public class Tarball {

    /**
     * Creates a tarball from the source directory and writes it into the target directory.
     *
     * @param sourceDirectory directory whose files will be added to the tarball
     * @param targetName      directory where tarball will be written to
     * @throws IOException when an exception occurs on creating the tarball
     */
    public static void createFromDirectory(String sourceDirectory, String targetName) throws IOException {
        FileOutputStream fileOutputStream = null;
        BufferedOutputStream bufferedOutputStream = null;
        GzipCompressorOutputStream gzipOutputStream = null;
        TarArchiveOutputStream tarArchiveOutputStream = null;

        try {
            fileOutputStream = new FileOutputStream(new File(targetName));
            bufferedOutputStream = new BufferedOutputStream(fileOutputStream);
            gzipOutputStream = new GzipCompressorOutputStream(bufferedOutputStream);
            tarArchiveOutputStream = new TarArchiveOutputStream(gzipOutputStream);

            addFilesInDirectory(tarArchiveOutputStream, sourceDirectory);
        } finally {
            if (tarArchiveOutputStream != null) {
                tarArchiveOutputStream.finish();
            }
            if (tarArchiveOutputStream != null) {
                tarArchiveOutputStream.close();
            }
            if (gzipOutputStream != null) {
                gzipOutputStream.close();
            }
            if (bufferedOutputStream != null) {
                bufferedOutputStream.close();
            }
            if (fileOutputStream != null) {
                fileOutputStream.close();
            }
        }
    }

    private static void addFilesInDirectory(TarArchiveOutputStream tarOutputStream, String path)
            throws IOException {
        File file = new File(path);
        File[] children = file.listFiles();

        if (children != null) {
            for (File child : children) {
                addFile(tarOutputStream, child.getAbsolutePath(), "/");
            }
        }
    }

    private static void addFile(TarArchiveOutputStream tarOutputStream, String path, String base)
            throws IOException {
        File file = new File(path);
        String entryName = base + file.getName();
        TarArchiveEntry tarEntry = new TarArchiveEntry(file, entryName);

        tarOutputStream.setLongFileMode(TarArchiveOutputStream.LONGFILE_GNU);
        tarOutputStream.putArchiveEntry(tarEntry);

        if (file.isFile()) {
            IOUtils.copy(new FileInputStream(file), tarOutputStream);
            tarOutputStream.closeArchiveEntry();
        } else {
            tarOutputStream.closeArchiveEntry();
            File[] children = file.listFiles();
            if (children != null) {
                for (File child : children) {
                    addFile(tarOutputStream, child.getAbsolutePath(), entryName + "/");
                }
            }
        }
    }
}