bundles/fmi/tools/org.eclipse.papyrus.moka.fmi/src/org/eclipse/papyrus/moka/fmi/util/UnzipUtility.java

/*****************************************************************************
 * 
 * Copyright (c) 2016 CEA LIST.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  CEA LIST Initial API and implementation
 * 
 *****************************************************************************/
package org.eclipse.papyrus.moka.fmi.util;
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 UnzipUtility {
    /**
     * Size of the buffer to read/write data
     */
    private static final int BUFFER_SIZE = 4096;
    /**
     * Extracts a zip file specified by the zipFilePath to a directory specified by
     * destDirectory (will be created if does not exists)
     * @param zipFilePath
     * @param destDirectory
     * @throws IOException
     */
    public static void unzip(String zipFilePath, String destDirectory) throws IOException {
        File destDir = new File(destDirectory);
        if (!destDir.exists()) {
            destDir.mkdir();
        }
       try(ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath));){
    	   unzip(zipIn, destDirectory);
       }
    }
    
    
    public static void unzip(ZipInputStream zipIn, String destDirectory) throws IOException {
    	
    	ZipEntry entry =  zipIn.getNextEntry();
         // iterates over entries in the zip file
         while (entry != null) {
             String filePath = destDirectory + File.separator + entry.getName();
             boolean isDirectory = entry.isDirectory();
             
             String replacement = File.separator.equals("\\")? "\\\\":"/";
             filePath= filePath.replaceAll("/", replacement);
             filePath= filePath.replaceAll("\\\\", replacement);
             if (!isDirectory) {
                 // if the entry is a file, extracts it
                 extractFile(zipIn, filePath);
             } else {
                 // if the entry is a directory, make the directory
                 File dir = new File(filePath);
                 dir.mkdirs();
                 
             }
             zipIn.closeEntry();
             entry = zipIn.getNextEntry();
         }
         zipIn.close();
	}
	/**
     * Extracts a zip entry (file entry)
     * @param zipIn
     * @param filePath
     * @throws IOException
     */
    private static void extractFile(ZipInputStream zipIn,  String filePath) throws IOException {
    	File outputFile = new File(filePath);
    	File parent = new File(outputFile.getParent());
    	if (!parent.exists()){
    		parent.mkdirs();
    	}
    	BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath));
        byte[] bytesIn = new byte[BUFFER_SIZE];
        int read = 0;
        while ((read = zipIn.read(bytesIn)) != -1) {
            bos.write(bytesIn, 0, read);
        }
        bos.close();
       	outputFile.setExecutable(true);
       
        
    }
}