package org.apache.maven.index.util.zip;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   */
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.Enumeration;
  import java.util.List;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipFile;
  
  public class JavaZipFileHandle
      extends AbstractZipHandle
      implements ZipHandle
  {
      private final ZipFile zipFile;
  
      public JavaZipFileHandle( final File targetFile )
          throws IOException
      {
          super( targetFile );
  
          this.zipFile = new ZipFile( targetFile );
      }
  
      protected ZipFile getZipFile()
      {
          return zipFile;
      }
  
      public boolean hasEntry( String path )
          throws IOException
      {
          return getZipFile().getEntry( path ) != null;
      }
  
      public List<String> getEntries()
      {
          return getEntries( new EntryNameFilter()
          {
              public boolean accepts( String entryName )
              {
                  return true;
              }
          } );
      }
  
      public List<String> getEntries( EntryNameFilter filter )
      {
          ArrayList<String> entries = new ArrayList<String>();
  
          Enumeration<? extends ZipEntry> en = getZipFile().entries();
  
          while ( en.hasMoreElements() )
          {
              final ZipEntry e = en.nextElement();
  
              final String name = e.getName();
  
              if ( filter != null && !filter.accepts( name ) )
              {
                  continue;
              }
  
              entries.add( name );
          }
  
          return entries;
      }
  
      public InputStream getEntryContent( String path )
          throws IOException
      {
          ZipEntry entry = getZipFile().getEntry( path );
  
          if ( entry != null )
          {
              return getZipFile().getInputStream( entry );
          }
          else
         {
             return null;
         }
     }
 
     public void close()
         throws IOException
     {
         getZipFile().close();
     }
 }