gov.va.oia.terminology.converters.sharedUtils.Unzip.java Source code

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Here is the source code for gov.va.oia.terminology.converters.sharedUtils.Unzip.java

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/**
 * Copyright Notice
 *
 * This is a work of the U.S. Government and is not subject to copyright
 * protection in the United States. Foreign copyrights may apply.
 * 
 * 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 gov.va.oia.terminology.converters.sharedUtils;

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 java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.io.IOUtils;

/**
 * 
 * {@link Unzip}
 *
 * Trivial unzip utility using java zip support.
 *
 * @author <a href="mailto:daniel.armbrust.list@gmail.com">Dan Armbrust</a>
 */
public class Unzip {
    public final static void unzip(File zipFile, File rootDir) throws IOException {
        ZipFile zip = new ZipFile(zipFile);
        @SuppressWarnings("unchecked")
        Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) zip.entries();
        while (entries.hasMoreElements()) {
            ZipEntry entry = entries.nextElement();
            java.io.File f = new java.io.File(rootDir, entry.getName());
            if (entry.isDirectory()) {
                f.mkdirs();
                continue;
            } else {
                f.createNewFile();
            }
            InputStream is = null;
            OutputStream os = null;
            try {
                is = zip.getInputStream(entry);
                os = new FileOutputStream(f);
                IOUtils.copy(is, os);
            } finally {
                if (is != null) {
                    try {
                        is.close();
                    } catch (Exception e) {
                        // noop
                    }
                }
                if (os != null) {
                    try {
                        os.close();
                    } catch (Exception e) {
                        // noop
                    }
                }
            }
        }
        zip.close();
    }
}