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/*
 * Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
 *
 * Licensed 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. See accompanying
 * LICENSE file.
 */

package com.gemstone.gemfire.cache.query.internal.types;

import java.util.*;

import com.gemstone.gemfire.cache.query.internal.NullToken;
import com.gemstone.gemfire.cache.query.internal.Undefined;

/**
 * A general comparator that will let us compare different numeric types for equality
 * 
 * @author jhuynh
 */

public class ExtendedNumericComparator extends NumericComparator implements Comparator {
  
  @Override
  public boolean equals(Object obj) {
    return obj instanceof ExtendedNumericComparator;
  }

  public int compare(Object obj1, Object obj2) {
    if (obj1.getClass() != obj2.getClass()
        && (obj1 instanceof Number && obj2 instanceof Number)) {
      return super.compare(obj1, obj2);
    } else if(obj2 instanceof Undefined && !(obj1 instanceof Undefined)){
      // Everthing should be greater than Undefined
      return 1;
    }else if(obj2 instanceof NullToken && !(obj1 instanceof NullToken)){
      // Everthing should be greater than Null
      return 1;
    }

    return ((Comparable) obj1).compareTo(obj2);
  }
}