80 lines
2.2 KiB
Java
80 lines
2.2 KiB
Java
/*
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* Copyright (C) 2011 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.base;
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import java.io.Serializable;
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import java.util.Iterator;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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@GwtCompatible(serializable = true)
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final class PairwiseEquivalence<T> extends Equivalence<Iterable<T>> implements Serializable {
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final Equivalence<? super T> elementEquivalence;
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PairwiseEquivalence(Equivalence<? super T> elementEquivalence) {
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this.elementEquivalence = Preconditions.checkNotNull(elementEquivalence);
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}
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@Override
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protected boolean doEquivalent(Iterable<T> iterableA, Iterable<T> iterableB) {
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Iterator<T> iteratorA = iterableA.iterator();
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Iterator<T> iteratorB = iterableB.iterator();
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while (iteratorA.hasNext() && iteratorB.hasNext()) {
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if (!elementEquivalence.equivalent(iteratorA.next(), iteratorB.next())) {
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return false;
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}
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}
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return !iteratorA.hasNext() && !iteratorB.hasNext();
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}
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@Override
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protected int doHash(Iterable<T> iterable) {
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int hash = 78721;
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for (T element : iterable) {
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hash = hash * 24943 + elementEquivalence.hash(element);
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}
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return hash;
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}
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@Override
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public boolean equals(@Nullable Object object) {
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if (object instanceof PairwiseEquivalence) {
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PairwiseEquivalence<?> that = (PairwiseEquivalence<?>) object;
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return this.elementEquivalence.equals(that.elementEquivalence);
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}
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return false;
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}
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@Override
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public int hashCode() {
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return elementEquivalence.hashCode() ^ 0x46a3eb07;
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}
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@Override
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public String toString() {
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return elementEquivalence + ".pairwise()";
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}
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private static final long serialVersionUID = 1;
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}
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