74 lines
2.0 KiB
Java
74 lines
2.0 KiB
Java
|
/*
|
||
|
|
* Copyright (C) 2007 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.collect;
|
||
|
|
|
||
|
|
import java.io.Serializable;
|
||
|
|
import java.util.Comparator;
|
||
|
|
|
||
|
|
import com.google.common.annotations.GwtCompatible;
|
||
|
|
|
||
|
|
/** An ordering that tries several comparators in order. */
|
||
|
|
@GwtCompatible(serializable = true)
|
||
|
|
final class CompoundOrdering<T> extends Ordering<T> implements Serializable {
|
||
|
|
final ImmutableList<Comparator<? super T>> comparators;
|
||
|
|
|
||
|
|
CompoundOrdering(Comparator<? super T> primary, Comparator<? super T> secondary) {
|
||
|
|
this.comparators = ImmutableList.<Comparator<? super T>>of(primary, secondary);
|
||
|
|
}
|
||
|
|
|
||
|
|
CompoundOrdering(Iterable<? extends Comparator<? super T>> comparators) {
|
||
|
|
this.comparators = ImmutableList.copyOf(comparators);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int compare(T left, T right) {
|
||
|
|
// Avoid using the Iterator to avoid generating garbage (issue 979).
|
||
|
|
int size = comparators.size();
|
||
|
|
for (int i = 0; i < size; i++) {
|
||
|
|
int result = comparators.get(i).compare(left, right);
|
||
|
|
if (result != 0) {
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public boolean equals(Object object) {
|
||
|
|
if (object == this) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
if (object instanceof CompoundOrdering) {
|
||
|
|
CompoundOrdering<?> that = (CompoundOrdering<?>) object;
|
||
|
|
return this.comparators.equals(that.comparators);
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public int hashCode() {
|
||
|
|
return comparators.hashCode();
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public String toString() {
|
||
|
|
return "Ordering.compound(" + comparators + ")";
|
||
|
|
}
|
||
|
|
|
||
|
|
private static final long serialVersionUID = 0;
|
||
|
|
}
|