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/*
* 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.util.Collection;
import java.util.Comparator;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import javax.annotation.Nullable;
/**
* Implementation of {@code Multimap} whose keys and values are ordered by
* their natural ordering or by supplied comparators. In all cases, this
* implementation uses {@link Comparable#compareTo} or {@link
* Comparator#compare} instead of {@link Object#equals} to determine
* equivalence of instances.
*
* <p><b>Warning:</b> The comparators or comparables used must be <i>consistent
* with equals</i> as explained by the {@link Comparable} class specification.
* Otherwise, the resulting multiset will violate the general contract of {@link
* SetMultimap}, which it is specified in terms of {@link Object#equals}.
*
* <p>The collections returned by {@code keySet} and {@code asMap} iterate
* through the keys according to the key comparator ordering or the natural
* ordering of the keys. Similarly, {@code get}, {@code removeAll}, and {@code
* replaceValues} return collections that iterate through the values according
* to the value comparator ordering or the natural ordering of the values. The
* collections generated by {@code entries}, {@code keys}, and {@code values}
* iterate across the keys according to the above key ordering, and for each
* key they iterate across the values according to the value ordering.
*
* <p>The multimap does not store duplicate key-value pairs. Adding a new
* key-value pair equal to an existing key-value pair has no effect.
*
* <p>Null keys and values are permitted (provided, of course, that the
* respective comparators support them). All optional multimap methods are
* supported, and all returned views are modifiable.
*
* <p>This class is not threadsafe when any concurrent operations update the
* multimap. Concurrent read operations will work correctly. To allow concurrent
* update operations, wrap your multimap with a call to {@link
* Multimaps#synchronizedSortedSetMultimap}.
*
* <p>See the Guava User Guide article on <a href=
* "http://code.google.com/p/guava-libraries/wiki/NewCollectionTypesExplained#Multimap">
* {@code Multimap}</a>.
*
* @author Jared Levy
* @author Louis Wasserman
* @since 2.0 (imported from Google Collections Library)
*/
@GwtCompatible(serializable = true, emulated = true)
public class TreeMultimap<K, V> extends AbstractSortedKeySortedSetMultimap<K, V> {
private transient Comparator<? super K> keyComparator;
private transient Comparator<? super V> valueComparator;
/**
* Creates an empty {@code TreeMultimap} ordered by the natural ordering of
* its keys and values.
*/
public static <K extends Comparable, V extends Comparable>
TreeMultimap<K, V> create() {
return new TreeMultimap<K, V>(Ordering.natural(), Ordering.natural());
}
/**
* Creates an empty {@code TreeMultimap} instance using explicit comparators.
* Neither comparator may be null; use {@link Ordering#natural()} to specify
* natural order.
*
* @param keyComparator the comparator that determines the key ordering
* @param valueComparator the comparator that determines the value ordering
*/
public static <K, V> TreeMultimap<K, V> create(
Comparator<? super K> keyComparator,
Comparator<? super V> valueComparator) {
return new TreeMultimap<K, V>(checkNotNull(keyComparator),
checkNotNull(valueComparator));
}
/**
* Constructs a {@code TreeMultimap}, ordered by the natural ordering of its
* keys and values, with the same mappings as the specified multimap.
*
* @param multimap the multimap whose contents are copied to this multimap
*/
public static <K extends Comparable, V extends Comparable>
TreeMultimap<K, V> create(Multimap<? extends K, ? extends V> multimap) {
return new TreeMultimap<K, V>(Ordering.natural(), Ordering.natural(),
multimap);
}
TreeMultimap(Comparator<? super K> keyComparator,
Comparator<? super V> valueComparator) {
super(new TreeMap<K, Collection<V>>(keyComparator));
this.keyComparator = keyComparator;
this.valueComparator = valueComparator;
}
private TreeMultimap(Comparator<? super K> keyComparator,
Comparator<? super V> valueComparator,
Multimap<? extends K, ? extends V> multimap) {
this(keyComparator, valueComparator);
putAll(multimap);
}
/**
* {@inheritDoc}
*
* <p>Creates an empty {@code TreeSet} for a collection of values for one key.
*
* @return a new {@code TreeSet} containing a collection of values for one
* key
*/
@Override SortedSet<V> createCollection() {
return new TreeSet<V>(valueComparator);
}
@Override
Collection<V> createCollection(@Nullable K key) {
if (key == null) {
keyComparator().compare(key, key);
}
return super.createCollection(key);
}
/**
* Returns the comparator that orders the multimap keys.
*/
public Comparator<? super K> keyComparator() {
return keyComparator;
}
@Override
public Comparator<? super V> valueComparator() {
return valueComparator;
}
/*
* The following @GwtIncompatible methods override the methods in
* AbstractSortedKeySortedSetMultimap, so GWT will fall back to the ASKSSM implementations,
* which return SortedSets and SortedMaps.
*/
}
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