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
   *
   *     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.distributedlog.io;
  
  /**
   * Utils for compression related operations.
   */
  public class CompressionUtils {
  
      public static final String LZ4 = "lz4";
      public static final String NONE = "none";
  
      /**
       * Get a cached compression codec instance for the specified type.
       * @param type compression codec type
       * @return compression codec instance
       */
      public static CompressionCodec getCompressionCodec(CompressionCodec.Type type) {
          if (type == CompressionCodec.Type.LZ4) {
              return LZ4CompressionCodec.of();
          }
          // No Compression
          return IdentityCompressionCodec.of();
      }
  
      /**
       * Compression type value from string.
       * @param compressionString compression codec presentation in string
       * @return compression codec type
       */
      public static CompressionCodec.Type stringToType(String compressionString) {
          if (compressionString.equals(LZ4)) {
              return CompressionCodec.Type.LZ4;
          } else if (compressionString.equals(NONE)) {
              return CompressionCodec.Type.NONE;
          } else {
              return CompressionCodec.Type.UNKNOWN;
          }
      }
  }
  