io.wcm.maven.plugins.nodejs.installation.TarUnArchiver.java Source code

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Here is the source code for io.wcm.maven.plugins.nodejs.installation.TarUnArchiver.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.io
 * %%
 * 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.
 * #L%
 */
package io.wcm.maven.plugins.nodejs.installation;

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

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.maven.plugin.MojoExecutionException;

/**
 * Wrapper around the commons comress library to decompress the zipped tar archives
 */
public class TarUnArchiver {

    private File archive;

    /**
     * Public constructor
     * @param archive
     */
    public TarUnArchiver(File archive) {
        this.archive = archive;
    }

    /**
     * Unarchives the arvive into the pBaseDir
     * @param baseDir
     * @throws MojoExecutionException
     */
    public void unarchive(String baseDir) throws MojoExecutionException {
        try {
            FileInputStream fis = new FileInputStream(archive);

            // TarArchiveInputStream can be constructed with a normal FileInputStream if
            // we ever need to extract regular '.tar' files.
            final TarArchiveInputStream tarIn = new TarArchiveInputStream(new GzipCompressorInputStream(fis));

            TarArchiveEntry tarEntry = tarIn.getNextTarEntry();
            while (tarEntry != null) {
                // Create a file for this tarEntry
                final File destPath = new File(baseDir + File.separator + tarEntry.getName());
                if (tarEntry.isDirectory()) {
                    destPath.mkdirs();
                } else {
                    destPath.createNewFile();
                    destPath.setExecutable(true);
                    //byte [] btoRead = new byte[(int)tarEntry.getSize()];
                    byte[] btoRead = new byte[8024];
                    final BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(destPath));
                    int len = 0;

                    while ((len = tarIn.read(btoRead)) != -1) {
                        bout.write(btoRead, 0, len);
                    }

                    bout.close();
                }
                tarEntry = tarIn.getNextTarEntry();
            }
            tarIn.close();
        } catch (IOException e) {
            throw new MojoExecutionException("Could not extract archive: '" + archive.getAbsolutePath() + "'", e);
        }

    }
}