80 lines
2.2 KiB
Java
80 lines
2.2 KiB
Java
|
/*
|
||
|
|
* Copyright (C) 2011 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.base;
|
||
|
|
|
||
|
|
import java.io.Serializable;
|
||
|
|
import java.util.Iterator;
|
||
|
|
|
||
|
|
import javax.annotation.Nullable;
|
||
|
|
|
||
|
|
import com.google.common.annotations.GwtCompatible;
|
||
|
|
|
||
|
|
@GwtCompatible(serializable = true)
|
||
|
|
final class PairwiseEquivalence<T> extends Equivalence<Iterable<T>> implements Serializable {
|
||
|
|
|
||
|
|
final Equivalence<? super T> elementEquivalence;
|
||
|
|
|
||
|
|
PairwiseEquivalence(Equivalence<? super T> elementEquivalence) {
|
||
|
|
this.elementEquivalence = Preconditions.checkNotNull(elementEquivalence);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
protected boolean doEquivalent(Iterable<T> iterableA, Iterable<T> iterableB) {
|
||
|
|
Iterator<T> iteratorA = iterableA.iterator();
|
||
|
|
Iterator<T> iteratorB = iterableB.iterator();
|
||
|
|
|
||
|
|
while (iteratorA.hasNext() && iteratorB.hasNext()) {
|
||
|
|
if (!elementEquivalence.equivalent(iteratorA.next(), iteratorB.next())) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return !iteratorA.hasNext() && !iteratorB.hasNext();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
protected int doHash(Iterable<T> iterable) {
|
||
|
|
int hash = 78721;
|
||
|
|
for (T element : iterable) {
|
||
|
|
hash = hash * 24943 + elementEquivalence.hash(element);
|
||
|
|
}
|
||
|
|
return hash;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean equals(@Nullable Object object) {
|
||
|
|
if (object instanceof PairwiseEquivalence) {
|
||
|
|
PairwiseEquivalence<?> that = (PairwiseEquivalence<?>) object;
|
||
|
|
return this.elementEquivalence.equals(that.elementEquivalence);
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int hashCode() {
|
||
|
|
return elementEquivalence.hashCode() ^ 0x46a3eb07;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
return elementEquivalence + ".pairwise()";
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final long serialVersionUID = 1;
|
||
|
|
}
|