lang/java/avro/src/main/java/org/apache/avro/file/Codec.java

/**
 * 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.
 */
package org.apache.avro.file;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * Interface for Avro-supported compression codecs for data files.
 */
public abstract class Codec {
  /** Name of the codec; written to the file's metadata. */
  public abstract String getName();
  /** Compresses the input data */
  public abstract ByteBuffer compress(ByteBuffer uncompressedData) throws IOException;
  /** Decompress the data  */
  public abstract ByteBuffer decompress(ByteBuffer compressedData) throws IOException;
  /**
   * 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 retult of A and B decompressing content compressed by B is the same
   **/
  @Override
  public abstract boolean equals(Object other);
  /**
   * Codecs must implement a hashCode() method that is consistent with equals().*/
  @Override
  public abstract int hashCode();
  @Override
  public String toString() {
    return getName();
  }
}