| /* |
| * Copyright (C) 2012 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 com.google.common.annotations.GwtCompatible; |
| import java.io.Serializable; |
| import java.util.List; |
| import org.checkerframework.checker.nullness.compatqual.NullableDecl; |
| |
| /** |
| * An ordering that treats all references as equals, even nulls. |
| * |
| * @author Emily Soldal |
| */ |
| @GwtCompatible(serializable = true) |
| final class AllEqualOrdering extends Ordering<Object> implements Serializable { |
| static final AllEqualOrdering INSTANCE = new AllEqualOrdering(); |
| |
| @Override |
| public int compare(@NullableDecl Object left, @NullableDecl Object right) { |
| return 0; |
| } |
| |
| @Override |
| public <E> List<E> sortedCopy(Iterable<E> iterable) { |
| return Lists.newArrayList(iterable); |
| } |
| |
| @Override |
| public <E> ImmutableList<E> immutableSortedCopy(Iterable<E> iterable) { |
| return ImmutableList.copyOf(iterable); |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public <S> Ordering<S> reverse() { |
| return (Ordering<S>) this; |
| } |
| |
| private Object readResolve() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public String toString() { |
| return "Ordering.allEqual()"; |
| } |
| |
| private static final long serialVersionUID = 0; |
| } |