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 backtype.storm.serialization;
  
  import java.util.Map;
  import java.util.zip.GZIPInputStream;
  
  /**
   * Always writes gzip out, but tests incoming to see if it's gzipped. If it is, deserializes with gzip. If not, uses
   * {@link backtype.storm.serialization.DefaultSerializationDelegate} to deserialize. Any logic needing to be enabled via {@link #prepare(java.util.Map)} is
   * passed through to both delegates.
   */
  @Deprecated
  public class GzipBridgeSerializationDelegate implements SerializationDelegate {
  
      private DefaultSerializationDelegate defaultDelegate = new DefaultSerializationDelegate();
      private GzipSerializationDelegate gzipDelegate = new GzipSerializationDelegate();
  
      @Override
      public void prepare(Map stormConf) {
          defaultDelegate.prepare(stormConf);
          gzipDelegate.prepare(stormConf);
      }
  
      @Override
      public byte[] serialize(Object object) {
          return gzipDelegate.serialize(object);
      }
  
      @Override
      public <T> T deserialize(byte[] bytes, Class<T> clazz) {
          if (isGzipped(bytes)) {
              return gzipDelegate.deserialize(bytes, clazz);
          } else {
              return defaultDelegate.deserialize(bytes, clazz);
          }
      }
  
      // Split up GZIP_MAGIC into readable bytes
      private static final byte GZIP_MAGIC_FIRST_BYTE = (byte) GZIPInputStream.GZIP_MAGIC;
      private static final byte GZIP_MAGIC_SECOND_BYTE = (byte) (GZIPInputStream.GZIP_MAGIC >> 8);
  
      /**
       * Looks ahead to see if the GZIP magic constant is heading {@code bytes}
       */
      private boolean isGzipped(byte[] bytes) {
          return (bytes.length > 1) && (bytes[0] == GZIP_MAGIC_FIRST_BYTE) && (bytes[1] == GZIP_MAGIC_SECOND_BYTE);
      }
  }
  