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.codec;
  
  import static java.nio.charset.StandardCharsets.UTF_8;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import org.apache.avro.file.Codec;
  
  /**
   * Simple Custom Codec to validate making Codec Public Compress and Decompress
   * operations are just bitwise-NOT of data
   */
  public class CustomCodec extends Codec {
  
    private static final String CODECNAME = "CUSTOMCODEC";
  
    @Override
    public String getName() {
      return CODECNAME;
    }
  
    @Override
    public ByteBuffer compress(ByteBuffer in) throws IOException {
      ByteBuffer out = ByteBuffer.allocate(in.remaining());
      while (in.position() < in.capacity())
        out.put((byte) ~in.get());
      return out;
    }
  
    @Override
    public ByteBuffer decompress(ByteBuffer in) throws IOException {
      ByteBuffer out = ByteBuffer.allocate(in.remaining());
      while (in.position() < in.capacity())
        out.put((byte) ~in.get());
      return out;
    }
  
    @Override
    public boolean equals(Object other) {
      if (this == other)
        return true;
      if (other instanceof Codec) {
        ByteBuffer original = ByteBuffer.allocate(getName().getBytes(UTF_8).length);
        original.put(getName().getBytes(UTF_8));
        original.rewind();
        try {
          return compareDecompress((Codec) other, original);
        } catch (IOException e) {
          return false;
        }
      } else
        return false;
    }
  
    /**
     * Codecs must implement an equals() method. Two codecs, A and B are equal if:
     * the result of A and B decompressing content compressed by A is the same AND
     * the result of A and B decompressing content compressed by B is the same
     */
    private boolean compareDecompress(Codec other, ByteBuffer original) throws IOException {
      ByteBuffer compressedA = this.compress(original);
      original.rewind();
      ByteBuffer compressedB = other.compress(original);
  
      return this.decompress(compressedA).equals(other.decompress((ByteBuffer) compressedA.rewind()))
          && this.decompress(compressedB).equals(other.decompress((ByteBuffer) compressedB.rewind()));
    }
  
    @Override
    public int hashCode() {
      return getName().hashCode();
    }
  }
  