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.hadoop.file;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.apache.avro.AvroRuntimeException;
  import org.apache.avro.file.CodecFactory;
  
  /**
   * Encapsulates the ability to specify and configure an avro compression codec
   * from a given hadoop codec defined with the configuration parameter:
   * mapred.output.compression.codec
   *
   * Currently there are three codecs registered by default:
   * <ul>
   * <li>{@code org.apache.hadoop.io.compress.DeflateCodec} will map to
   * {@code deflate}</li>
   * <li>{@code org.apache.hadoop.io.compress.SnappyCodec} will map to
   * {@code snappy}</li>
   * <li>{@code org.apache.hadoop.io.compress.BZip2Codec} will map to
   * {@code bzip2}</li>
   * <li>{@code org.apache.hadoop.io.compress.GZipCodec} will map to
   * {@code deflate}</li>
   * <li>{@code org.apache.hadoop.io.compress.ZStandardCodec} will map to
   * {@code zstandard}</li>
   * </ul>
   */
  public class HadoopCodecFactory {
  
    private static final Map<String, String> HADOOP_AVRO_NAME_MAP = new HashMap<>();
  
    static {
      HADOOP_AVRO_NAME_MAP.put("org.apache.hadoop.io.compress.DeflateCodec", "deflate");
      HADOOP_AVRO_NAME_MAP.put("org.apache.hadoop.io.compress.SnappyCodec", "snappy");
      HADOOP_AVRO_NAME_MAP.put("org.apache.hadoop.io.compress.BZip2Codec", "bzip2");
      HADOOP_AVRO_NAME_MAP.put("org.apache.hadoop.io.compress.GZipCodec", "deflate");
      HADOOP_AVRO_NAME_MAP.put("org.apache.hadoop.io.compress.ZStandardCodec", "zstandard");
    }
  
    /**
     * Maps a hadoop codec name into a CodecFactory.
     *
     * Currently there are four hadoop codecs registered:
     * <ul>
     * <li>{@code org.apache.hadoop.io.compress.DeflateCodec} will map to
     * {@code deflate}</li>
     * <li>{@code org.apache.hadoop.io.compress.SnappyCodec} will map to
     * {@code snappy}</li>
     * <li>{@code org.apache.hadoop.io.compress.BZip2Codec} will map to
     * {@code bzip2}</li>
     * <li>{@code org.apache.hadoop.io.compress.GZipCodec} will map to
     * {@code deflate}</li>
     * <li>{@code org.apache.hadoop.io.compress.ZStandardCodec} will map to
     * {@code zstandard}</li>
     * </ul>
     */
    public static CodecFactory fromHadoopString(String hadoopCodecClass) {
  
      CodecFactory o = null;
      try {
        String avroCodec = HADOOP_AVRO_NAME_MAP.get(hadoopCodecClass);
        if (avroCodec != null) {
          o = CodecFactory.fromString(avroCodec);
        }
      } catch (Exception e) {
        throw new AvroRuntimeException("Unrecognized hadoop codec: " + hadoopCodecClass, e);
      }
      return o;
    }
  
    public static String getAvroCodecName(String hadoopCodecClass) {
      return HADOOP_AVRO_NAME_MAP.get(hadoopCodecClass);
    }
  }
  