package org.codehaus.plexus.archiver.gzip;
   
   import javax.annotation.Nonnull;
   import javax.inject.Named;
   
   import java.io.File;
   import java.io.IOException;
   import java.io.InputStream;
   import java.util.HashMap;
  import java.util.zip.GZIPInputStream;
  
  import org.codehaus.plexus.components.io.attributes.FileAttributes;
  import org.codehaus.plexus.components.io.attributes.PlexusIoResourceAttributes;
  import org.codehaus.plexus.components.io.resources.PlexusIoCompressedFileResourceCollection;
  
  import static org.codehaus.plexus.archiver.util.Streams.bufferedInputStream;
  import static org.codehaus.plexus.archiver.util.Streams.fileInputStream;
  
  /**
   * Abstract base class for compressed files, aka singleton
   * resource collections.
   */
  @Named("gzip")
  public class PlexusIoGzipResourceCollection extends PlexusIoCompressedFileResourceCollection {
  
      @Override
      protected String getDefaultExtension() {
          return ".gz";
      }
  
      @Nonnull
      @Override
      protected InputStream getInputStream(File file) throws IOException {
          return bufferedInputStream(new GZIPInputStream(fileInputStream(file)));
      }
  
      @Override
      protected PlexusIoResourceAttributes getAttributes(File file) throws IOException {
          return new FileAttributes(file, new HashMap<Integer, String>(), new HashMap<Integer, String>());
      }
  }