content: /*
   * 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
   *
   *     https://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.apache.avro.file;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  
  import org.apache.avro.util.NonCopyingByteArrayOutputStream;
  import org.apache.commons.compress.compressors.xz.XZCompressorInputStream;
  import org.apache.commons.compress.compressors.xz.XZCompressorOutputStream;
  
  /** * Implements xz compression and decompression. */
  public class XZCodec extends Codec {
    public final static int DEFAULT_COMPRESSION = 6;
    private static final int DEFAULT_BUFFER_SIZE = 8192;
  
    static class Option extends CodecFactory {
      private final int compressionLevel;
  
      Option(int compressionLevel) {
        this.compressionLevel = compressionLevel;
      }
  
      @Override
      protected Codec createInstance() {
        return new XZCodec(compressionLevel);
      }
    }
  
    private final int compressionLevel;
  
    public XZCodec(int compressionLevel) {
      this.compressionLevel = compressionLevel;
    }
  
    @Override
    public String getName() {
      return DataFileConstants.XZ_CODEC;
    }
  
    @Override
    public ByteBuffer compress(ByteBuffer data) throws IOException {
      NonCopyingByteArrayOutputStream baos = new NonCopyingByteArrayOutputStream(DEFAULT_BUFFER_SIZE);
      try (OutputStream outputStream = new XZCompressorOutputStream(baos, compressionLevel)) {
        outputStream.write(data.array(), computeOffset(data), data.remaining());
      }
      return baos.asByteBuffer();
    }
  
    @Override
    public ByteBuffer decompress(ByteBuffer data) throws IOException {
      NonCopyingByteArrayOutputStream baos = new NonCopyingByteArrayOutputStream(DEFAULT_BUFFER_SIZE);
      InputStream bytesIn = new ByteArrayInputStream(data.array(), computeOffset(data), data.remaining());
  
      try (InputStream ios = new XZCompressorInputStream(bytesIn)) {
        ios.transferTo(baos);
      }
      return baos.asByteBuffer();
    }
  
    @Override
    public int hashCode() {
      return compressionLevel;
    }
  
    @Override
    public boolean equals(Object obj) {
      if (this == obj)
        return true;
      if (obj == null || obj.getClass() != getClass())
        return false;
      XZCodec other = (XZCodec) obj;
      return (this.compressionLevel == other.compressionLevel);
    }
  
    @Override
    public String toString() {
      return getName() + "-" + compressionLevel;
    }
  }
  