package com.simpligility.maven.plugins.androidndk.common;

 import org.apache.commons.io.IOUtils;

 import org.codehaus.plexus.util.IOUtil;

 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.jar.JarEntry;

 import java.util.jar.JarFile;

 /**

  * Helper class to deal with jar files.

  *

  * @author Johan Lindquist

  */

 public class JarHelper

 {

     /**

      * Listener for jar extraction.

      */

     public interface UnjarListener

     {

        boolean include( JarEntry jarEntry );

     }

     /**

      * Unjars the specified jar file into the the specified directory

      *

      * @param jarFile

      * @param outputDirectory

      * @param unjarListener

      * @throws IOException

      */

     public static void unjar( JarFile jarFile, File outputDirectory, UnjarListener unjarListener ) throws IOException

     {

         for ( Enumeration en = jarFile.entries(); en.hasMoreElements(); )

         {

             JarEntry entry = ( JarEntry ) en.nextElement();

             File entryFile = new File( outputDirectory, entry.getName() );

             if ( unjarListener.include( entry ) )

             {

                 // Create the output directory if need be

                 if ( ! entryFile.getParentFile().exists() )

                 {

                     if ( ! entryFile.getParentFile().mkdirs() )

                     {

                         throw new IOException( "Error creating output directory: " + entryFile.getParentFile() );

                     }

                 }

                 // If the entry is an actual file, unzip that too

                 if ( ! entry.isDirectory() )

                 {

                     final InputStream in = jarFile.getInputStream( entry );

                     try

                     {

                         final OutputStream out = new FileOutputStream( entryFile );

                         try

                         {

                             IOUtil.copy( in, out );

                         }

                         finally

                         {

                             IOUtils.closeQuietly( out );

                         }

                     }

                     finally

                     {

                         IOUtils.closeQuietly( in );

                     }

                 }

             }

         }

     }

 }