66 lines
1.7 KiB
Java
66 lines
1.7 KiB
Java
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/*
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* Copyright (C) 2007 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.collect;
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import static com.google.common.base.Preconditions.checkNotNull;
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import java.io.Serializable;
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import java.util.Comparator;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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/** An ordering for a pre-existing comparator. */
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@GwtCompatible(serializable = true)
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final class ComparatorOrdering<T> extends Ordering<T> implements Serializable {
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final Comparator<T> comparator;
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ComparatorOrdering(Comparator<T> comparator) {
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this.comparator = checkNotNull(comparator);
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}
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@Override
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public int compare(T a, T b) {
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return comparator.compare(a, b);
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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 == this) {
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return true;
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}
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if (object instanceof ComparatorOrdering) {
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ComparatorOrdering<?> that = (ComparatorOrdering<?>) object;
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return this.comparator.equals(that.comparator);
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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 comparator.hashCode();
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}
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@Override
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public String toString() {
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return comparator.toString();
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}
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private static final long serialVersionUID = 0;
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}
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