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.formats.nontagged;
  
  import org.apache.asterix.dataflow.data.nontagged.comparators.ABinaryComparator;
  import org.apache.hyracks.api.dataflow.value.IBinaryComparator;
  import org.apache.hyracks.api.dataflow.value.IBinaryComparatorFactory;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.api.io.IJsonSerializable;
  import org.apache.hyracks.api.io.IPersistedResourceRegistry;
  
  import com.fasterxml.jackson.databind.JsonNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  
  public class OrderedBinaryComparatorFactory implements IBinaryComparatorFactory {
  
      private static final long serialVersionUID = 1L;
      private final boolean ascending;
      private final IBinaryComparatorFactory factory;
  
      public OrderedBinaryComparatorFactory(IBinaryComparatorFactory factory, boolean ascending) {
          this.factory = factory;
          this.ascending = ascending;
      }
  
      @Override
      public IBinaryComparator createBinaryComparator() {
          final IBinaryComparator bc = factory.createBinaryComparator();
          if (ascending) {
              return new ABinaryComparator() {
  
                  @Override
                  public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) throws HyracksDataException {
                      return bc.compare(b1, s1 + 1, l1 - 1, b2, s2 + 1, l2 - 1);
                  }
              };
          } else {
              return new ABinaryComparator() {
                  @Override
                  public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) throws HyracksDataException {
                      return -bc.compare(b1, s1 + 1, l1 - 1, b2, s2 + 1, l2 - 1);
                  }
              };
          }
      }
  
      @Override
      public JsonNode toJson(IPersistedResourceRegistry registry) throws HyracksDataException {
          ObjectNode json = registry.getClassIdentifier(getClass(), serialVersionUID);
          json.set("factory", factory.toJson(registry));
          json.put("ascending", ascending);
          return json;
      }
  
      public static IJsonSerializable fromJson(IPersistedResourceRegistry registry, JsonNode json)
              throws HyracksDataException {
          final IBinaryComparatorFactory factory = (IBinaryComparatorFactory) registry.deserialize(json.get("factory"));
          return new OrderedBinaryComparatorFactory(factory, json.get("ascending").asBoolean());
      }
  }
  