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 com.aliyun.odps.mapred.bridge.type;
  
  import java.util.Comparator;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.OdpsType;
  
  /**
   * {@link com.aliyun.odps.data.Record}内容的自然序比较器
   */
  public class NaturalRecordComparator implements Comparator<Object[]> {
  
    @SuppressWarnings("rawtypes")
    protected Comparator[] comparators;
  
    public NaturalRecordComparator(Column[] schema) {
      super();
      comparators = new Comparator[schema.length];
      for (int i = 0; i < schema.length; i++) {
        OdpsType type = schema[i].getType();
        comparators[i] = ComparatorFactory.getComparator(type);
      }
    }
  
    @Override
    public int compare(Object[] l, Object[] r) {
      int result = 0;
      for (int i = 0; i < l.length; i++) {
        if (r.length < i) {
          return -1;
        }
        result = compare(l[i], r[i], comparators[i]);
        if (result != 0) {
          return result;
        }
      }
      if (r.length > l.length) {
        return 1;
      }
      return 0;
    }
  
    @SuppressWarnings({"unchecked", "rawtypes"})
    protected int compare(Object l, Object r, Comparator comparator) {
      return comparator.compare(l, r);
    }
  
  }
  