Android Open Source - javocsoft-toolbox Unzipper

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2010-2014 - JavocSoft - Javier Gonzalez Serrano
 * http://javocsoft.es/proyectos/code-libs/android/javocsoft-toolbox-android-library
 * /*  w w w .j  a  v a 2s.  com*/
 * This file is part of JavocSoft Android Toolbox library.
 *
 * JavocSoft Android Toolbox library is free software: you can redistribute it 
 * and/or modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation, either version 3 of the License, 
 * or (at your option) any later version.
 *
 * JavocSoft Android Toolbox library is distributed in the hope that it will be 
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General 
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JavocSoft Android Toolbox library.  If not, see 
 * <http://www.gnu.org/licenses/>.
 * 
 */
package es.javocsoft.android.lib.toolbox.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import android.util.Log;


/**
 * Class to unzip zipped files.
 *
 * Example of usage:
 * 
 *     String zipFile = Environment.getExternalStorageDirectory() + "/files.zip"; 
 *    String unzipLocation = Environment.getExternalStorageDirectory() + "/unzipped/"; 
 *     
 *    Unzipper d = new Unzipper(zipFile, unzipLocation, true);
 *    d.unzip();
 * 
 * @author JavocSoft 2013
 * @version 1.0
 */
public class Unzipper {

  private String zipFile;
  private String location;
  private boolean createFolders;
  private int bufferSize;
  
  private static final int DEFAULT_BUFFER_SIZE = 1024;

  
  public Unzipper(String zipFile, String location, boolean createFolders) {
    this(zipFile, location, createFolders, DEFAULT_BUFFER_SIZE);
  }
  
  public Unzipper(String zipFile, String location, boolean createFolders, int bufferSize) {
    this.zipFile = zipFile;
    this.location = location;
    this.createFolders = createFolders;

        this.bufferSize = bufferSize;

    dirChecker("");
  }

  
  /**
   * Unzips the ZIP file.
   * 
   * @return The list of unzziped files.
   */
  public List<String> unzip() {
    ArrayList<String> res = new ArrayList<String>();
    
    try {
      FileInputStream fin = new FileInputStream(zipFile);
      ZipInputStream zin = new ZipInputStream(fin);
      ZipEntry ze = null;
      while ((ze = zin.getNextEntry()) != null) {
        Log.v("Unzipper", "Unzipping " + ze.getName());

        if (ze.isDirectory()) {
          dirChecker(ze.getName());
        } else {
          byte[] buffer = new byte[bufferSize];
          FileOutputStream fout = new FileOutputStream(location + ze.getName());
          
          int bytesRead = 0;
              while ((bytesRead = zin.read(buffer, 0, buffer.length)) >= 0) {
                fout.write(buffer, 0, bytesRead);
              }

          zin.closeEntry();
          fout.close();
          
          res.add(location + ze.getName());
        }

      }
      zin.close();
    } catch (Exception e) {
      Log.e("Unzipper", "Unzip Error (" + e.getMessage() + ")", e);
    }
    
    return res;
  }
  
  
  //AUXILIAR
  
  private void dirChecker(String dir) {
    File f = new File(location + dir);

    if (!f.isDirectory()) {
      if(createFolders)
        f.mkdirs();
    }
  }
}

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