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.asterix.dataflow.data.nontagged.keynormalizers;
  
  import org.apache.hyracks.api.dataflow.value.INormalizedKeyComputer;
  import org.apache.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
  import org.apache.hyracks.api.dataflow.value.INormalizedKeyProperties;
  
  /**
   * This class uses a decorator pattern to wrap an ASC ordered INomralizedKeyComputerFactory implementation
   * to obtain the DESC order.
   */
  public class AWrappedDescNormalizedKeyComputerFactory implements INormalizedKeyComputerFactory {
  
      private static final long serialVersionUID = 1L;
      private final INormalizedKeyComputerFactory nkcf;
      private final int normalizedKeyLength;
  
      public AWrappedDescNormalizedKeyComputerFactory(INormalizedKeyComputerFactory nkcf) {
          this.nkcf = nkcf;
          this.normalizedKeyLength = nkcf.getNormalizedKeyProperties().getNormalizedKeyLength();
      }
  
      @Override
      public INormalizedKeyComputer createNormalizedKeyComputer() {
          final INormalizedKeyComputer nkc = nkcf.createNormalizedKeyComputer();
          return new INormalizedKeyComputer() {
  
              @Override
              public void normalize(byte[] bytes, int start, int length, int[] normalizedKeys, int keyStart) {
                  nkc.normalize(bytes, start + 1, length - 1, normalizedKeys, keyStart);
                  for (int i = 0; i < normalizedKeyLength; i++) {
                      int key = normalizedKeys[keyStart + i];
                      normalizedKeys[keyStart + i] = ~key;
                  }
              }
  
              @Override
              public INormalizedKeyProperties getNormalizedKeyProperties() {
                  return nkc.getNormalizedKeyProperties();
              }
          };
      }
  
      @Override
      public INormalizedKeyProperties getNormalizedKeyProperties() {
          return nkcf.getNormalizedKeyProperties();
      }
  
  }
  