74 lines
2.0 KiB
Java
74 lines
2.0 KiB
Java
/*
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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 java.io.Serializable;
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import java.util.Comparator;
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import com.google.common.annotations.GwtCompatible;
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/** An ordering that tries several comparators in order. */
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@GwtCompatible(serializable = true)
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final class CompoundOrdering<T> extends Ordering<T> implements Serializable {
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final ImmutableList<Comparator<? super T>> comparators;
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CompoundOrdering(Comparator<? super T> primary, Comparator<? super T> secondary) {
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this.comparators = ImmutableList.<Comparator<? super T>>of(primary, secondary);
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}
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CompoundOrdering(Iterable<? extends Comparator<? super T>> comparators) {
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this.comparators = ImmutableList.copyOf(comparators);
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}
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@Override
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public int compare(T left, T right) {
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// Avoid using the Iterator to avoid generating garbage (issue 979).
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int size = comparators.size();
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for (int i = 0; i < size; i++) {
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int result = comparators.get(i).compare(left, right);
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if (result != 0) {
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return result;
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}
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}
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return 0;
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}
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@Override
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public boolean equals(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 CompoundOrdering) {
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CompoundOrdering<?> that = (CompoundOrdering<?>) object;
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return this.comparators.equals(that.comparators);
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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 comparators.hashCode();
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}
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@Override
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public String toString() {
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return "Ordering.compound(" + comparators + ")";
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}
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private static final long serialVersionUID = 0;
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}
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