/**
    *
    * Copyright 2004 The Apache Software Foundation
    *
    * Licensed 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.
   */
  package org.codehaus.plexus.archiver.snappy;
  
  import javax.annotation.Nonnull;
  import javax.inject.Named;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.compress.compressors.snappy.FramedSnappyCompressorInputStream;
  import org.codehaus.plexus.archiver.AbstractUnArchiver;
  import org.codehaus.plexus.archiver.ArchiverException;
  
  import static org.codehaus.plexus.archiver.util.Streams.bufferedInputStream;
  import static org.codehaus.plexus.archiver.util.Streams.bufferedOutputStream;
  import static org.codehaus.plexus.archiver.util.Streams.copyFully;
  import static org.codehaus.plexus.archiver.util.Streams.fileInputStream;
  import static org.codehaus.plexus.archiver.util.Streams.fileOutputStream;
  
  /**
   * Unarchiver for snappy-compressed files.
   */
  @Named("snappy")
  public class SnappyUnArchiver extends AbstractUnArchiver {
  
      private static final String OPERATION_SNAPPY = "snappy";
  
      public SnappyUnArchiver() {}
  
      public SnappyUnArchiver(File sourceFile) {
          super(sourceFile);
      }
  
      @Override
      protected void execute() throws ArchiverException {
          if (getSourceFile().lastModified() > getDestFile().lastModified()) {
              getLogger()
                      .info("Expanding " + getSourceFile().getAbsolutePath() + " to "
                              + getDestFile().getAbsolutePath());
  
              copyFully(
                      getSnappyInputStream(bufferedInputStream(fileInputStream(getSourceFile(), OPERATION_SNAPPY))),
                      bufferedOutputStream(fileOutputStream(getDestFile(), OPERATION_SNAPPY)),
                      OPERATION_SNAPPY);
          }
      }
  
      public static @Nonnull FramedSnappyCompressorInputStream getSnappyInputStream(InputStream bis)
              throws ArchiverException {
          try {
              return new FramedSnappyCompressorInputStream(bis);
          } catch (IOException e) {
              throw new ArchiverException("Trouble creating Snappy compressor, invalid file ?", e);
          }
      }
  
      @Override
      protected void execute(String path, File outputDirectory) {
          throw new UnsupportedOperationException("Targeted extraction not supported in Snappy format.");
      }
  }