1 /* 2 * Copyright (C) 2007 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import com.google.common.annotations.GwtCompatible; 20 import java.io.Serializable; 21 import java.util.Arrays; 22 import java.util.Comparator; 23 import javax.annotation.CheckForNull; 24 import org.checkerframework.checker.nullness.qual.Nullable; 25 26 /** An ordering that tries several comparators in order. */ 27 @GwtCompatible(serializable = true) 28 @ElementTypesAreNonnullByDefault 29 final class CompoundOrdering<T extends @Nullable Object> extends Ordering<T> 30 implements Serializable { 31 final Comparator<? super T>[] comparators; 32 CompoundOrdering(Comparator<? super T> primary, Comparator<? super T> secondary)33 CompoundOrdering(Comparator<? super T> primary, Comparator<? super T> secondary) { 34 this.comparators = (Comparator<? super T>[]) new Comparator[] {primary, secondary}; 35 } 36 CompoundOrdering(Iterable<? extends Comparator<? super T>> comparators)37 CompoundOrdering(Iterable<? extends Comparator<? super T>> comparators) { 38 this.comparators = Iterables.toArray(comparators, new Comparator[0]); 39 } 40 41 @Override compare(@arametricNullness T left, @ParametricNullness T right)42 public int compare(@ParametricNullness T left, @ParametricNullness T right) { 43 for (int i = 0; i < comparators.length; i++) { 44 int result = comparators[i].compare(left, right); 45 if (result != 0) { 46 return result; 47 } 48 } 49 return 0; 50 } 51 52 @Override equals(@heckForNull Object object)53 public boolean equals(@CheckForNull Object object) { 54 if (object == this) { 55 return true; 56 } 57 if (object instanceof CompoundOrdering) { 58 CompoundOrdering<?> that = (CompoundOrdering<?>) object; 59 return Arrays.equals(this.comparators, that.comparators); 60 } 61 return false; 62 } 63 64 @Override hashCode()65 public int hashCode() { 66 return Arrays.hashCode(comparators); 67 } 68 69 @Override toString()70 public String toString() { 71 return "Ordering.compound(" + Arrays.toString(comparators) + ")"; 72 } 73 74 private static final long serialVersionUID = 0; 75 } 76