/
AllEqualOrdering.java
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/
AllEqualOrdering.java
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/*
* 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 javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* An ordering that treats all references as equals, even nulls.
*
* @author Emily Soldal
*/
@GwtCompatible(serializable = true)
@ElementTypesAreNonnullByDefault
final class AllEqualOrdering extends Ordering<@Nullable Object> implements Serializable {
static final AllEqualOrdering INSTANCE = new AllEqualOrdering();
@Override
public int compare(@CheckForNull Object left, @CheckForNull Object right) {
return 0;
}
@Override
public <E extends @Nullable Object> 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 extends @Nullable Object> 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;
}