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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 com.google.common.annotations.GwtCompatible;
import java.util.Map;
import javax.annotation.Nullable;
/**
* Implementation of {@link ImmutableMultiset} with one or more elements.
*
* @author Jared Levy
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true)
@SuppressWarnings("serial")
// uses writeReplace(), not default serialization
class RegularImmutableMultiset<E> extends ImmutableMultiset<E> {
private final transient ImmutableMap<E, Integer> map;
private final transient int size;
RegularImmutableMultiset(ImmutableMap<E, Integer> map, int size) {
this.map = map;
this.size = size;
}
@Override
boolean isPartialView() {
return map.isPartialView();
}
@Override
public int count(@Nullable Object element) {
Integer value = map.get(element);
return (value == null) ? 0 : value;
}
@Override
public int size() {
return size;
}
@Override
public boolean contains(@Nullable Object element) {
return map.containsKey(element);
}
@Override
public ImmutableSet<E> elementSet() {
return map.keySet();
}
private static <E> Entry<E> entryFromMapEntry(Map.Entry<E, Integer> entry) {
return Multisets.immutableEntry(entry.getKey(), entry.getValue());
}
@Override
ImmutableSet<Entry<E>> createEntrySet() {
return new EntrySet();
}
private class EntrySet extends ImmutableMultiset<E>.EntrySet {
@Override
public int size() {
return map.size();
}
@Override
public UnmodifiableIterator<Entry<E>> iterator() {
return asList().iterator();
}
@Override
ImmutableList<Entry<E>> createAsList() {
final ImmutableList<Map.Entry<E, Integer>> entryList = map.entrySet().asList();
return new ImmutableAsList<Entry<E>>() {
@Override
public Entry<E> get(int index) {
return entryFromMapEntry(entryList.get(index));
}
@Override
ImmutableCollection<Entry<E>> delegateCollection() {
return EntrySet.this;
}
};
}
}
@Override
public int hashCode() {
return map.hashCode();
}
}
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