120 lines
3.2 KiB
Java
120 lines
3.2 KiB
Java
/*
|
|
* 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;
|
|
|
|
import javax.annotation.Nullable;
|
|
|
|
import com.google.common.annotations.GwtCompatible;
|
|
|
|
/**
|
|
* An object representing the differences between two maps.
|
|
*
|
|
* @author Kevin Bourrillion
|
|
* @since 2.0 (imported from Google Collections Library)
|
|
*/
|
|
@GwtCompatible
|
|
public interface MapDifference<K, V> {
|
|
/**
|
|
* Returns {@code 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
|
|
* {@code true} if the given object is also a {@code MapDifference} and the
|
|
* values returned by the {@link #entriesOnlyOnLeft()},
|
|
* {@link #entriesOnlyOnRight()}, {@link #entriesInCommon()} and
|
|
* {@link #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
|
|
*
|
|
* <pre>
|
|
* {@code
|
|
*
|
|
* Arrays.asList(entriesOnlyOnLeft(), entriesOnlyOnRight(),
|
|
* entriesInCommon(), entriesDiffering())}
|
|
* </pre>
|
|
*/
|
|
@Override
|
|
int hashCode();
|
|
|
|
/**
|
|
* A difference between the mappings from two maps with the same key. The
|
|
* {@link #leftValue} and {@link #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 {@link #leftValue()} values are
|
|
* equal and their {@link #rightValue()} values are also equal.
|
|
*/
|
|
@Override
|
|
boolean equals(@Nullable Object other);
|
|
|
|
/**
|
|
* The hash code equals the value
|
|
* {@code Arrays.asList(leftValue(), rightValue()).hashCode()}.
|
|
*/
|
|
@Override
|
|
int hashCode();
|
|
}
|
|
|
|
}
|