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/*
* Copyright (C) 2011 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 java.util.Collection;
import java.util.Comparator;
import javax.annotation.Nullable;
/**
* An empty immutable sorted multiset.
*
* @author Louis Wasserman
*/
@SuppressWarnings("serial") // Uses writeReplace, not default serialization
final class EmptyImmutableSortedMultiset<E> extends ImmutableSortedMultiset<E> {
private final ImmutableSortedSet<E> elementSet;
EmptyImmutableSortedMultiset(Comparator<? super E> comparator) {
this.elementSet = ImmutableSortedSet.emptySet(comparator);
}
@Override
public Entry<E> firstEntry() {
return null;
}
@Override
public Entry<E> lastEntry() {
return null;
}
@Override
public int count(@Nullable Object element) {
return 0;
}
@Override
public boolean contains(@Nullable Object object) {
return false;
}
@Override
public boolean containsAll(Collection<?> targets) {
return targets.isEmpty();
}
@Override
public int size() {
return 0;
}
@Override
public ImmutableSortedSet<E> elementSet() {
return elementSet;
}
@Override
public ImmutableSet<Entry<E>> entrySet() {
return ImmutableSet.of();
}
@Override
ImmutableSet<Entry<E>> createEntrySet() {
throw new AssertionError("should never be called");
}
@Override
public ImmutableSortedMultiset<E> headMultiset(E upperBound, BoundType boundType) {
checkNotNull(upperBound);
checkNotNull(boundType);
return this;
}
@Override
public ImmutableSortedMultiset<E> tailMultiset(E lowerBound, BoundType boundType) {
checkNotNull(lowerBound);
checkNotNull(boundType);
return this;
}
@Override
public UnmodifiableIterator<E> iterator() {
return Iterators.emptyIterator();
}
@Override
public boolean equals(@Nullable Object object) {
if (object instanceof Multiset) {
Multiset<?> other = (Multiset<?>) object;
return other.isEmpty();
}
return false;
}
@Override
public int hashCode() {
return 0;
}
@Override
public String toString() {
return "[]";
}
@Override
boolean isPartialView() {
return false;
}
@Override
public Object[] toArray() {
return ObjectArrays.EMPTY_ARRAY;
}
@Override
public <T> T[] toArray(T[] other) {
return asList().toArray(other);
}
@Override
public ImmutableList<E> asList() {
return ImmutableList.of();
}
}
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