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  /*
   * Copyright (C) 2007 The Guava Authors
   *
   * 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.
  */
 
 package com.google.common.collect;
 
 
 import java.util.Map;
 
An object representing the differences between two maps.

Author(s):
Kevin Bourrillion
Since:
2.0 (imported from Google Collections Library)
 
 public interface MapDifference<K, V> {
  
Returns true if there are no differences between the two maps; that is, if the maps are equal.
 
   boolean areEqual();

  
Returns an unmodifiable map containing the entries from the left map whose keys are not present in the right map.
 
   Map<K, V> entriesOnlyOnLeft();

  
Returns an unmodifiable map containing the entries from the right map whose keys are not present in the left map.
 
   Map<K, V> entriesOnlyOnRight();

  
Returns an unmodifiable map containing the entries that appear in both maps; that is, the intersection of the two maps.
 
   Map<K, V> entriesInCommon();

  
Returns an unmodifiable map describing keys that appear in both maps, but with different values.
 
   Map<K, ValueDifference<V>> entriesDiffering();

  
Compares the specified object with this instance for equality. Returns true if the given object is also a MapDifference and the values returned by the entriesOnlyOnLeft(), entriesOnlyOnRight(), entriesInCommon() and entriesDiffering() of the two instances are equal.
 
   @Override
   boolean equals(@Nullable Object object);

  
Returns the hash code for this instance. This is defined as the hash code of
   Arrays.asList(entriesOnlyOnLeft(), entriesOnlyOnRight(),
       entriesInCommon(), entriesDiffering())
 
   @Override
   int hashCode();

  
A difference between the mappings from two maps with the same key. The leftValue() and rightValue() are not equal, and one but not both of them may be null.

Since:
2.0 (imported from Google Collections Library)
 
   interface ValueDifference<V> {
    
Returns the value from the left map (possibly null).
 
     V leftValue();

    
Returns the value from the right map (possibly null).
 
     V rightValue();

    
Two instances are considered equal if their leftValue() values are equal and their rightValue() values are also equal.
    @Override boolean equals(@Nullable Object other);

    
The hash code equals the value Arrays.asList(leftValue(), rightValue()).hashCode().
    @Override int hashCode();
  }
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