fr.gael.ccsds.sip.archive.TarArchiveManager.java Source code

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Here is the source code for fr.gael.ccsds.sip.archive.TarArchiveManager.java

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/**
 * SIP Builder
 * Copyright (C) 2012, 2013 GAEL Systems
 * Copyright (C) 2012, 2013 European Space Agency (ESA)
 * GNU Lesser General Public License (LGPL)
 * 
 * This file is part of SIP Builder software.
 * 
 * SIP Builder is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * SIP Builder is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package fr.gael.ccsds.sip.archive;

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

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.utils.IOUtils;

public class TarArchiveManager implements ArchiveManager {

    /**
     * Produces TAR archive
     */
    @Override
    public File copy(final File src, final File tar_file, final String dst) throws Exception {
        final ArchiveStreamFactory asf = new ArchiveStreamFactory();

        // Case of tar already exist: all the entries must be copied..
        if (tar_file.exists()) {
            final FileInputStream fis = new FileInputStream(tar_file);
            final ArchiveInputStream ais = asf.createArchiveInputStream(ArchiveStreamFactory.TAR, fis);

            final File tempFile = File.createTempFile("updateTar", "tar");
            final FileOutputStream fos = new FileOutputStream(tempFile);
            final ArchiveOutputStream aos = asf.createArchiveOutputStream(ArchiveStreamFactory.TAR, fos);

            // copy the existing entries
            ArchiveEntry nextEntry;
            while ((nextEntry = ais.getNextEntry()) != null) {
                aos.putArchiveEntry(nextEntry);
                IOUtils.copy(ais, aos);
                aos.closeArchiveEntry();
            }

            // create the new entry
            final TarArchiveEntry entry = new TarArchiveEntry(src, dst);
            entry.setSize(src.length());
            aos.putArchiveEntry(entry);
            final FileInputStream sfis = new FileInputStream(src);
            IOUtils.copy(sfis, aos);
            sfis.close();
            aos.closeArchiveEntry();

            aos.finish();
            ais.close();
            aos.close();
            fis.close();

            // copies the new file over the old
            tar_file.delete();
            tempFile.renameTo(tar_file);
            return tar_file;
        } else {
            final FileOutputStream fos = new FileOutputStream(tar_file);
            final ArchiveOutputStream aos = asf.createArchiveOutputStream(ArchiveStreamFactory.TAR, fos);

            // create the new entry
            final TarArchiveEntry entry = new TarArchiveEntry(src, dst);
            entry.setSize(src.length());
            aos.putArchiveEntry(entry);
            final FileInputStream sfis = new FileInputStream(src);
            IOUtils.copy(sfis, aos);
            sfis.close();
            aos.closeArchiveEntry();

            aos.finish();
            aos.close();
            fos.close();
        }
        return tar_file;
    }

    @Override
    public String getFileExtension() {
        return ".tar";
    }

}