org.overlord.commons.dev.server.util.ArchiveUtils.java Source code

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Here is the source code for org.overlord.commons.dev.server.util.ArchiveUtils.java

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/*
 * Copyright 2012 JBoss Inc
 *
 * 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.overlord.commons.dev.server.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;

import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.apache.commons.io.IOUtils;

/**
 * Some general porpoise utils for working with archives.
 *
 * @author eric.wittmann@redhat.com
 */
public class ArchiveUtils {

    /**
     * Unpacks the given archive file into the output directory.
     * @param archiveFile an archive file
     * @param toDir where to unpack the archive to
     * @throws IOException
     */
    public static void unpackToWorkDir(File archiveFile, File toDir) throws IOException {
        ZipFile zipFile = null;
        try {
            zipFile = new ZipFile(archiveFile);
            Enumeration<ZipArchiveEntry> zipEntries = zipFile.getEntries();
            while (zipEntries.hasMoreElements()) {
                ZipArchiveEntry entry = zipEntries.nextElement();
                String entryName = entry.getName();
                File outFile = new File(toDir, entryName);
                if (!outFile.getParentFile().exists()) {
                    if (!outFile.getParentFile().mkdirs()) {
                        throw new IOException(
                                "Failed to create parent directory: " + outFile.getParentFile().getCanonicalPath()); //$NON-NLS-1$
                    }
                }

                if (entry.isDirectory()) {
                    if (!outFile.exists() && !outFile.mkdir()) {
                        throw new IOException("Failed to create directory: " + outFile.getCanonicalPath()); //$NON-NLS-1$
                    } else if (outFile.exists() && !outFile.isDirectory()) {
                        throw new IOException("Failed to create directory (already exists but is a file): " //$NON-NLS-1$
                                + outFile.getCanonicalPath());
                    }
                } else {
                    InputStream zipStream = null;
                    OutputStream outFileStream = null;

                    zipStream = zipFile.getInputStream(entry);
                    outFileStream = new FileOutputStream(outFile);
                    try {
                        IOUtils.copy(zipStream, outFileStream);
                    } finally {
                        IOUtils.closeQuietly(zipStream);
                        IOUtils.closeQuietly(outFileStream);
                    }
                }
            }
        } finally {
            ZipFile.closeQuietly(zipFile);
        }
    }

}