dk.deck.resolver.util.ZipUtils.java Source code

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Here is the source code for dk.deck.resolver.util.ZipUtils.java

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/*
 * Copyright 2012 Jesper Terkelsen.
 * 
 * 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 dk.deck.resolver.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.io.IOUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author Jesper Terkelsen
 */
public class ZipUtils {
    private static Log log = LogFactory.getLog(ZipUtils.class);

    public ZipUtils() {
    }

    public List<String> listArchive(File archive) {
        List<String> paths = new ArrayList<String>();
        try {
            ZipFile zipfile = new ZipFile(archive);
            for (Enumeration e = zipfile.entries(); e.hasMoreElements();) {
                ZipEntry entry = (ZipEntry) e.nextElement();
                paths.add(entry.getName());
            }
            zipfile.close();
        } catch (Exception e) {
            log.error("Error while extracting file " + archive, e);
        }

        return paths;
    }

    public void unzipArchive(File archive, File outputDir) {
        try {
            ZipFile zipfile = new ZipFile(archive);
            for (Enumeration e = zipfile.entries(); e.hasMoreElements();) {
                ZipEntry entry = (ZipEntry) e.nextElement();
                unzipEntry(zipfile, entry, outputDir);
            }
            zipfile.close();
        } catch (Exception e) {
            log.error("Error while extracting file " + archive, e);
        }
    }

    private void unzipEntry(ZipFile zipfile, ZipEntry entry, File outputDir) throws IOException {

        if (entry.isDirectory()) {
            createDir(new File(outputDir, entry.getName()));
            return;
        }

        File outputFile = new File(outputDir, entry.getName());
        if (!outputFile.getParentFile().exists()) {
            createDir(outputFile.getParentFile());
        }

        // log.debug("Extracting: " + entry);
        BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
        BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));

        try {
            IOUtils.copy(inputStream, outputStream);
        } finally {
            outputStream.close();
            inputStream.close();
        }
    }

    private void createDir(File dir) {
        // log.debug("Creating dir "+dir.getName());
        if (!dir.mkdirs())
            throw new RuntimeException("Can not create dir " + dir);
    }
}