677 lines
19 KiB
Java
677 lines
19 KiB
Java
/*
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* Copyright (C) 2008 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import static com.google.common.base.Preconditions.checkNotNull;
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import static com.google.common.collect.CollectPreconditions.checkEntryNotNull;
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import java.io.Serializable;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import javax.annotation.Nullable;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.annotations.GwtIncompatible;
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/**
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* An immutable {@link Multimap}. Does not permit null keys or values.
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*
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* <p>
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* Unlike {@link Multimaps#unmodifiableMultimap(Multimap)}, which is a
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* <i>view</i> of a separate multimap which can still change, an instance of
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* {@code ImmutableMultimap} contains its own data and will <i>never</i> change.
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* {@code ImmutableMultimap} is convenient for {@code public static final}
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* multimaps ("constant multimaps") and also lets you easily make a "defensive
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* copy" of a multimap provided to your class by a caller.
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*
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* <p>
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* <b>Note:</b> Although this class is not final, it cannot be subclassed as it
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* has no public or protected constructors. Thus, instances of this class are
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* guaranteed to be immutable.
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*
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* <p>
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* In addition to methods defined by {@link Multimap}, an {@link #inverse}
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* method is also supported.
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*
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* <p>
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* See the Guava User Guide article on <a href=
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* "http://code.google.com/p/guava-libraries/wiki/ImmutableCollectionsExplained">
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* immutable collections</a>.
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*
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* @author Jared Levy
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* @since 2.0 (imported from Google Collections Library)
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*/
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@GwtCompatible(emulated = true)
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public abstract class ImmutableMultimap<K, V> extends AbstractMultimap<K, V> implements Serializable {
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/** Returns an empty multimap. */
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public static <K, V> ImmutableMultimap<K, V> of() {
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return ImmutableListMultimap.of();
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}
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/**
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* Returns an immutable multimap containing a single entry.
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*/
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public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1) {
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return ImmutableListMultimap.of(k1, v1);
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}
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/**
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* Returns an immutable multimap containing the given entries, in order.
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*/
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public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2) {
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return ImmutableListMultimap.of(k1, v1, k2, v2);
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}
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/**
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* Returns an immutable multimap containing the given entries, in order.
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*/
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public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {
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return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3);
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}
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/**
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* Returns an immutable multimap containing the given entries, in order.
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*/
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public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {
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return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3, k4, v4);
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}
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/**
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* Returns an immutable multimap containing the given entries, in order.
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*/
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public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) {
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return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5);
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}
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// looking for of() with > 5 entries? Use the builder instead.
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/**
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* Returns a new builder. The generated builder is equivalent to the builder
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* created by the {@link Builder} constructor.
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*/
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public static <K, V> Builder<K, V> builder() {
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return new Builder<K, V>();
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}
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/**
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* Multimap for {@link ImmutableMultimap.Builder} that maintains key and value
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* orderings, allows duplicate values, and performs better than
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* {@link LinkedListMultimap}.
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*/
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private static class BuilderMultimap<K, V> extends AbstractMapBasedMultimap<K, V> {
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BuilderMultimap() {
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super(new LinkedHashMap<K, Collection<V>>());
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}
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@Override
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Collection<V> createCollection() {
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return Lists.newArrayList();
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}
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private static final long serialVersionUID = 0;
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}
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/**
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* A builder for creating immutable multimap instances, especially
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* {@code public static final} multimaps ("constant multimaps"). Example:
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*
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* <pre>
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* {
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* @code
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*
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* static final Multimap<String, Integer> STRING_TO_INTEGER_MULTIMAP = new ImmutableMultimap.Builder<String, Integer>()
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* .put("one", 1).putAll("several", 1, 2, 3).putAll("many", 1, 2, 3, 4, 5).build();
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* }
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* </pre>
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*
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* <p>
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* Builder instances can be reused; it is safe to call {@link #build} multiple
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* times to build multiple multimaps in series. Each multimap contains the
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* key-value mappings in the previously created multimaps.
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*
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* @since 2.0 (imported from Google Collections Library)
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*/
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public static class Builder<K, V> {
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Multimap<K, V> builderMultimap = new BuilderMultimap<K, V>();
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Comparator<? super K> keyComparator;
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Comparator<? super V> valueComparator;
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/**
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* Creates a new builder. The returned builder is equivalent to the builder
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* generated by {@link ImmutableMultimap#builder}.
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*/
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public Builder() {
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}
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/**
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* Adds a key-value mapping to the built multimap.
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*/
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public Builder<K, V> put(K key, V value) {
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checkEntryNotNull(key, value);
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builderMultimap.put(key, value);
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return this;
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}
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/**
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* Adds an entry to the built multimap.
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*
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* @since 11.0
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*/
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public Builder<K, V> put(Entry<? extends K, ? extends V> entry) {
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return put(entry.getKey(), entry.getValue());
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}
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/**
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* Stores a collection of values with the same key in the built multimap.
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*
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* @throws NullPointerException if {@code key}, {@code values}, or any element
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* in {@code values} is null. The builder is left
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* in an invalid state.
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*/
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public Builder<K, V> putAll(K key, Iterable<? extends V> values) {
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if (key == null) {
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throw new NullPointerException("null key in entry: null=" + Iterables.toString(values));
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}
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Collection<V> valueList = builderMultimap.get(key);
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for (V value : values) {
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checkEntryNotNull(key, value);
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valueList.add(value);
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}
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return this;
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}
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/**
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* Stores an array of values with the same key in the built multimap.
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*
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* @throws NullPointerException if the key or any value is null. The builder is
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* left in an invalid state.
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*/
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public Builder<K, V> putAll(K key, V... values) {
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return putAll(key, Arrays.asList(values));
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}
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/**
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* Stores another multimap's entries in the built multimap. The generated
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* multimap's key and value orderings correspond to the iteration ordering of
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* the {@code multimap.asMap()} view, with new keys and values following any
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* existing keys and values.
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*
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* @throws NullPointerException if any key or value in {@code multimap} is null.
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* The builder is left in an invalid state.
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*/
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public Builder<K, V> putAll(Multimap<? extends K, ? extends V> multimap) {
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for (Entry<? extends K, ? extends Collection<? extends V>> entry : multimap.asMap().entrySet()) {
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putAll(entry.getKey(), entry.getValue());
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}
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return this;
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}
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/**
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* Specifies the ordering of the generated multimap's keys.
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*
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* @since 8.0
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*/
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public Builder<K, V> orderKeysBy(Comparator<? super K> keyComparator) {
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this.keyComparator = checkNotNull(keyComparator);
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return this;
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}
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/**
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* Specifies the ordering of the generated multimap's values for each key.
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*
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* @since 8.0
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*/
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public Builder<K, V> orderValuesBy(Comparator<? super V> valueComparator) {
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this.valueComparator = checkNotNull(valueComparator);
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return this;
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}
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/**
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* Returns a newly-created immutable multimap.
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*/
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public ImmutableMultimap<K, V> build() {
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if (valueComparator != null) {
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for (Collection<V> values : builderMultimap.asMap().values()) {
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List<V> list = (List<V>) values;
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Collections.sort(list, valueComparator);
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}
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}
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if (keyComparator != null) {
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Multimap<K, V> sortedCopy = new BuilderMultimap<K, V>();
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List<Map.Entry<K, Collection<V>>> entries = Lists.newArrayList(builderMultimap.asMap().entrySet());
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Collections.sort(entries, Ordering.from(keyComparator).<K>onKeys());
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for (Map.Entry<K, Collection<V>> entry : entries) {
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sortedCopy.putAll(entry.getKey(), entry.getValue());
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}
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builderMultimap = sortedCopy;
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}
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return copyOf(builderMultimap);
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}
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}
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/**
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* Returns an immutable multimap containing the same mappings as {@code
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* multimap}. The generated multimap's key and value orderings correspond to the
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* iteration ordering of the {@code multimap.asMap()} view.
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*
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* <p>
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* Despite the method name, this method attempts to avoid actually copying the
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* data when it is safe to do so. The exact circumstances under which a copy
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* will or will not be performed are undocumented and subject to change.
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*
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* @throws NullPointerException if any key or value in {@code multimap} is null
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*/
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public static <K, V> ImmutableMultimap<K, V> copyOf(Multimap<? extends K, ? extends V> multimap) {
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if (multimap instanceof ImmutableMultimap) {
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@SuppressWarnings("unchecked") // safe since multimap is not writable
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ImmutableMultimap<K, V> kvMultimap = (ImmutableMultimap<K, V>) multimap;
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if (!kvMultimap.isPartialView()) {
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return kvMultimap;
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}
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}
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return ImmutableListMultimap.copyOf(multimap);
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}
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final transient ImmutableMap<K, ? extends ImmutableCollection<V>> map;
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final transient int size;
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// These constants allow the deserialization code to set final fields. This
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// holder class makes sure they are not initialized unless an instance is
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// deserialized.
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@GwtIncompatible("java serialization is not supported")
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static class FieldSettersHolder {
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static final Serialization.FieldSetter<ImmutableMultimap> MAP_FIELD_SETTER = Serialization
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.getFieldSetter(ImmutableMultimap.class, "map");
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static final Serialization.FieldSetter<ImmutableMultimap> SIZE_FIELD_SETTER = Serialization
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.getFieldSetter(ImmutableMultimap.class, "size");
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static final Serialization.FieldSetter<ImmutableSetMultimap> EMPTY_SET_FIELD_SETTER = Serialization
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.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
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}
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ImmutableMultimap(ImmutableMap<K, ? extends ImmutableCollection<V>> map, int size) {
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this.map = map;
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this.size = size;
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}
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// mutators (not supported)
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public ImmutableCollection<V> removeAll(Object key) {
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throw new UnsupportedOperationException();
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}
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public ImmutableCollection<V> replaceValues(K key, Iterable<? extends V> values) {
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throw new UnsupportedOperationException();
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}
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public void clear() {
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throw new UnsupportedOperationException();
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}
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/**
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* Returns an immutable collection of the values for the given key. If no
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* mappings in the multimap have the provided key, an empty immutable collection
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* is returned. The values are in the same order as the parameters used to build
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* this multimap.
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*/
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@Override
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public abstract ImmutableCollection<V> get(K key);
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/**
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* Returns an immutable multimap which is the inverse of this one. For every
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* key-value mapping in the original, the result will have a mapping with key
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* and value reversed.
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*
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* @since 11.0
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*/
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public abstract ImmutableMultimap<V, K> inverse();
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public boolean put(K key, V value) {
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throw new UnsupportedOperationException();
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}
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public boolean putAll(K key, Iterable<? extends V> values) {
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throw new UnsupportedOperationException();
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}
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
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throw new UnsupportedOperationException();
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}
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/**
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* Guaranteed to throw an exception and leave the multimap unmodified.
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*
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* @throws UnsupportedOperationException always
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* @deprecated Unsupported operation.
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*/
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@Deprecated
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@Override
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public boolean remove(Object key, Object value) {
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throw new UnsupportedOperationException();
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}
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/**
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* Returns {@code true} if this immutable multimap's implementation contains
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* references to user-created objects that aren't accessible via this multimap's
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* methods. This is generally used to determine whether {@code copyOf}
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* implementations should make an explicit copy to avoid memory leaks.
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*/
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boolean isPartialView() {
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return map.isPartialView();
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}
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// accessors
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@Override
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public boolean containsKey(@Nullable Object key) {
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return map.containsKey(key);
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}
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@Override
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public boolean containsValue(@Nullable Object value) {
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return value != null && super.containsValue(value);
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}
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@Override
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public int size() {
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return size;
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}
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// views
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/**
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* Returns an immutable set of the distinct keys in this multimap. These keys
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* are ordered according to when they first appeared during the construction of
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* this multimap.
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*/
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@Override
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public ImmutableSet<K> keySet() {
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return map.keySet();
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}
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/**
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* Returns an immutable map that associates each key with its corresponding
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* values in the multimap.
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*/
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@Override
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@SuppressWarnings("unchecked") // a widening cast
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public ImmutableMap<K, Collection<V>> asMap() {
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return (ImmutableMap) map;
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}
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@Override
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Map<K, Collection<V>> createAsMap() {
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throw new AssertionError("should never be called");
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}
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/**
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* Returns an immutable collection of all key-value pairs in the multimap. Its
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* iterator traverses the values for the first key, the values for the second
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* key, and so on.
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*/
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@Override
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public ImmutableCollection<Entry<K, V>> entries() {
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return (ImmutableCollection<Entry<K, V>>) super.entries();
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}
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@Override
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ImmutableCollection<Entry<K, V>> createEntries() {
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return new EntryCollection<K, V>(this);
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}
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private static class EntryCollection<K, V> extends ImmutableCollection<Entry<K, V>> {
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final ImmutableMultimap<K, V> multimap;
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EntryCollection(ImmutableMultimap<K, V> multimap) {
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this.multimap = multimap;
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}
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@Override
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public UnmodifiableIterator<Entry<K, V>> iterator() {
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return multimap.entryIterator();
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}
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@Override
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boolean isPartialView() {
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return multimap.isPartialView();
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}
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@Override
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public int size() {
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return multimap.size();
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}
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@Override
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public boolean contains(Object object) {
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if (object instanceof Entry) {
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Entry<?, ?> entry = (Entry<?, ?>) object;
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return multimap.containsEntry(entry.getKey(), entry.getValue());
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}
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return false;
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}
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private static final long serialVersionUID = 0;
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}
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private abstract class Itr<T> extends UnmodifiableIterator<T> {
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final Iterator<Entry<K, Collection<V>>> mapIterator = asMap().entrySet().iterator();
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K key = null;
|
|
Iterator<V> valueIterator = Iterators.emptyIterator();
|
|
|
|
abstract T output(K key, V value);
|
|
|
|
@Override
|
|
public boolean hasNext() {
|
|
return mapIterator.hasNext() || valueIterator.hasNext();
|
|
}
|
|
|
|
@Override
|
|
public T next() {
|
|
if (!valueIterator.hasNext()) {
|
|
Entry<K, Collection<V>> mapEntry = mapIterator.next();
|
|
key = mapEntry.getKey();
|
|
valueIterator = mapEntry.getValue().iterator();
|
|
}
|
|
return output(key, valueIterator.next());
|
|
}
|
|
}
|
|
|
|
@Override
|
|
UnmodifiableIterator<Entry<K, V>> entryIterator() {
|
|
return new Itr<Entry<K, V>>() {
|
|
@Override
|
|
Entry<K, V> output(K key, V value) {
|
|
return Maps.immutableEntry(key, value);
|
|
}
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Returns a collection, which may contain duplicates, of all keys. The number
|
|
* of times a key appears in the returned multiset equals the number of mappings
|
|
* the key has in the multimap. Duplicate keys appear consecutively in the
|
|
* multiset's iteration order.
|
|
*/
|
|
@Override
|
|
public ImmutableMultiset<K> keys() {
|
|
return (ImmutableMultiset<K>) super.keys();
|
|
}
|
|
|
|
@Override
|
|
ImmutableMultiset<K> createKeys() {
|
|
return new Keys();
|
|
}
|
|
|
|
@SuppressWarnings("serial") // Uses writeReplace, not default serialization
|
|
class Keys extends ImmutableMultiset<K> {
|
|
@Override
|
|
public boolean contains(@Nullable Object object) {
|
|
return containsKey(object);
|
|
}
|
|
|
|
@Override
|
|
public int count(@Nullable Object element) {
|
|
Collection<V> values = map.get(element);
|
|
return (values == null) ? 0 : values.size();
|
|
}
|
|
|
|
@Override
|
|
public Set<K> elementSet() {
|
|
return keySet();
|
|
}
|
|
|
|
@Override
|
|
public int size() {
|
|
return ImmutableMultimap.this.size();
|
|
}
|
|
|
|
@Override
|
|
Multiset.Entry<K> getEntry(int index) {
|
|
Map.Entry<K, ? extends Collection<V>> entry = map.entrySet().asList().get(index);
|
|
return Multisets.immutableEntry(entry.getKey(), entry.getValue().size());
|
|
}
|
|
|
|
@Override
|
|
boolean isPartialView() {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns an immutable collection of the values in this multimap. Its iterator
|
|
* traverses the values for the first key, the values for the second key, and so
|
|
* on.
|
|
*/
|
|
@Override
|
|
public ImmutableCollection<V> values() {
|
|
return (ImmutableCollection<V>) super.values();
|
|
}
|
|
|
|
@Override
|
|
ImmutableCollection<V> createValues() {
|
|
return new Values<K, V>(this);
|
|
}
|
|
|
|
@Override
|
|
UnmodifiableIterator<V> valueIterator() {
|
|
return new Itr<V>() {
|
|
@Override
|
|
V output(K key, V value) {
|
|
return value;
|
|
}
|
|
};
|
|
}
|
|
|
|
private static final class Values<K, V> extends ImmutableCollection<V> {
|
|
private transient final ImmutableMultimap<K, V> multimap;
|
|
|
|
Values(ImmutableMultimap<K, V> multimap) {
|
|
this.multimap = multimap;
|
|
}
|
|
|
|
@Override
|
|
public boolean contains(@Nullable Object object) {
|
|
return multimap.containsValue(object);
|
|
}
|
|
|
|
@Override
|
|
public UnmodifiableIterator<V> iterator() {
|
|
return multimap.valueIterator();
|
|
}
|
|
|
|
@GwtIncompatible("not present in emulated superclass")
|
|
@Override
|
|
int copyIntoArray(Object[] dst, int offset) {
|
|
for (ImmutableCollection<V> valueCollection : multimap.map.values()) {
|
|
offset = valueCollection.copyIntoArray(dst, offset);
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
@Override
|
|
public int size() {
|
|
return multimap.size();
|
|
}
|
|
|
|
@Override
|
|
boolean isPartialView() {
|
|
return true;
|
|
}
|
|
|
|
private static final long serialVersionUID = 0;
|
|
}
|
|
|
|
private static final long serialVersionUID = 0;
|
|
}
|