org.soulwing.credo.service.archive.TarGzipArchiveBuilder.java Source code

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Here is the source code for org.soulwing.credo.service.archive.TarGzipArchiveBuilder.java

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/*
 * File created on Mar 9, 2014 
 *
 * Copyright (c) 2014 Virginia Polytechnic Institute and State University
 *
 * 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.
 *
 */
package org.soulwing.credo.service.archive;

import java.io.IOException;
import java.io.OutputStream;

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

/**
 * An {@link ArchiveBuilder} that builds TAR.GZ archives.
 *
 * @author Carl Harris
 */
public class TarGzipArchiveBuilder extends AbstractArchiveBuilder {

    private static final int USER_ID = 0;
    private static final int GROUP_ID = 0;
    private static final String USER_NAME = "root";
    private static final String GROUP_NAME = "daemon";
    private static final int MODE = TarArchiveEntry.DEFAULT_FILE_MODE & 0777400;

    private final ArchiveOutputStream tos;

    private TarArchiveEntry entry;

    public TarGzipArchiveBuilder() {
        try {
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
        try {
            tos = new TarArchiveOutputStream(new GzipCompressorOutputStream(buffer));
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
    }

    @Override
    protected void onBeginEntry(String name, String charset) throws IOException {
        entry = new TarArchiveEntry(name);
        entry.setIds(USER_ID, GROUP_ID);
        entry.setNames(USER_NAME, GROUP_NAME);
        entry.setMode(MODE);
    }

    @Override
    protected void beforeWriteEntry(byte[] content) throws IOException {
        entry.setSize(content.length);
        tos.putArchiveEntry(entry);
    }

    @Override
    protected void onEndEntry() throws IOException {
        tos.closeArchiveEntry();
    }

    @Override
    protected void onBuild() throws IOException {
        tos.close();
    }

    @Override
    protected OutputStream getOutputStream() {
        return tos;
    }

}