com.google.common.collect.ReverseOrdering Maven / Gradle / Ivy
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Builds the guava lib. Requires the jsr305 be built first.
/*
* 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 static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.annotations.GwtCompatible;
import java.io.Serializable;
import java.util.Iterator;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/** An ordering that uses the reverse of a given order. */
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class ReverseOrdering extends Ordering
implements Serializable {
final Ordering forwardOrder;
ReverseOrdering(Ordering forwardOrder) {
this.forwardOrder = checkNotNull(forwardOrder);
}
@Override
public int compare(@ParametricNullness T a, @ParametricNullness T b) {
return forwardOrder.compare(b, a);
}
@SuppressWarnings("unchecked") // how to explain?
@Override
public Ordering reverse() {
return (Ordering) forwardOrder;
}
// Override the min/max methods to "hoist" delegation outside loops
@Override
public E min(@ParametricNullness E a, @ParametricNullness E b) {
return forwardOrder.max(a, b);
}
@Override
public E min(
@ParametricNullness E a, @ParametricNullness E b, @ParametricNullness E c, E... rest) {
return forwardOrder.max(a, b, c, rest);
}
@Override
public E min(Iterator iterator) {
return forwardOrder.max(iterator);
}
@Override
public E min(Iterable iterable) {
return forwardOrder.max(iterable);
}
@Override
public E max(@ParametricNullness E a, @ParametricNullness E b) {
return forwardOrder.min(a, b);
}
@Override
public E max(
@ParametricNullness E a, @ParametricNullness E b, @ParametricNullness E c, E... rest) {
return forwardOrder.min(a, b, c, rest);
}
@Override
public E max(Iterator iterator) {
return forwardOrder.min(iterator);
}
@Override
public E max(Iterable iterable) {
return forwardOrder.min(iterable);
}
@Override
public int hashCode() {
return -forwardOrder.hashCode();
}
@Override
public boolean equals(@CheckForNull Object object) {
if (object == this) {
return true;
}
if (object instanceof ReverseOrdering) {
ReverseOrdering that = (ReverseOrdering) object;
return this.forwardOrder.equals(that.forwardOrder);
}
return false;
}
@Override
public String toString() {
return forwardOrder + ".reverse()";
}
private static final long serialVersionUID = 0;
}