| /* |
| * 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 com.google.common.annotations.GwtCompatible; |
| import java.io.Serializable; |
| import java.util.Iterator; |
| import org.checkerframework.checker.nullness.compatqual.NullableDecl; |
| |
| @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(@NullableDecl 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; |
| } |