io.fabric8.forge.devops.springboot.UnzipHelper Maven / Gradle / Ivy

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/**
 * Copyright 2005-2015 Red Hat, Inc.
 * 
 * Red Hat licenses this file to you 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 io.fabric8.forge.devops.springboot;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class UnzipHelper {

    /**
     * Size of the buffer to read/write data
     */
    private static final int BUFFER_SIZE = 8192;

    /**
     * Extracts a zip file specified by the zipFilePath to a directory specified by
     * destDirectory (will be created if does not exists)
     */
    public static void unzip(File file, File destDir) throws IOException {
        if (!destDir.exists()) {
            destDir.mkdir();
        }
        ZipInputStream zipIn = new ZipInputStream(new FileInputStream(file));
        ZipEntry entry = zipIn.getNextEntry();
        // iterates over entries in the zip file
        while (entry != null) {
            File entryFile = new File(destDir, entry.getName());
            if (!entry.isDirectory()) {
                // if the entry is a file, extracts it
                extractFile(zipIn, entryFile);
            } else {
                // if the entry is a directory, make the directory
                entryFile.mkdir();
            }
            zipIn.closeEntry();
            entry = zipIn.getNextEntry();
        }
        zipIn.close();
    }

    private static void extractFile(ZipInputStream zipIn, File file) throws IOException {
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
        byte[] bytesIn = new byte[BUFFER_SIZE];
        int read;
        while ((read = zipIn.read(bytesIn)) != -1) {
            bos.write(bytesIn, 0, read);
        }
        bos.close();
    }

}