EaglerForge/sources/main/java/com/google/common/collect/ImmutableMultimap.java

677 lines
19 KiB
Java

/*
* Copyright (C) 2008 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 static com.google.common.collect.CollectPreconditions.checkEntryNotNull;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.Nullable;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
/**
* An immutable {@link Multimap}. Does not permit null keys or values.
*
* <p>
* Unlike {@link Multimaps#unmodifiableMultimap(Multimap)}, which is a
* <i>view</i> of a separate multimap which can still change, an instance of
* {@code ImmutableMultimap} contains its own data and will <i>never</i> change.
* {@code ImmutableMultimap} is convenient for {@code public static final}
* multimaps ("constant multimaps") and also lets you easily make a "defensive
* copy" of a multimap provided to your class by a caller.
*
* <p>
* <b>Note:</b> Although this class is not final, it cannot be subclassed as it
* has no public or protected constructors. Thus, instances of this class are
* guaranteed to be immutable.
*
* <p>
* In addition to methods defined by {@link Multimap}, an {@link #inverse}
* method is also supported.
*
* <p>
* See the Guava User Guide article on <a href=
* "http://code.google.com/p/guava-libraries/wiki/ImmutableCollectionsExplained">
* immutable collections</a>.
*
* @author Jared Levy
* @since 2.0 (imported from Google Collections Library)
*/
@GwtCompatible(emulated = true)
public abstract class ImmutableMultimap<K, V> extends AbstractMultimap<K, V> implements Serializable {
/** Returns an empty multimap. */
public static <K, V> ImmutableMultimap<K, V> of() {
return ImmutableListMultimap.of();
}
/**
* Returns an immutable multimap containing a single entry.
*/
public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1) {
return ImmutableListMultimap.of(k1, v1);
}
/**
* Returns an immutable multimap containing the given entries, in order.
*/
public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2) {
return ImmutableListMultimap.of(k1, v1, k2, v2);
}
/**
* Returns an immutable multimap containing the given entries, in order.
*/
public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3) {
return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3);
}
/**
* Returns an immutable multimap containing the given entries, in order.
*/
public static <K, V> ImmutableMultimap<K, V> of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) {
return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3, k4, v4);
}
/**
* Returns an immutable multimap containing the given entries, in order.
*/
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) {
return ImmutableListMultimap.of(k1, v1, k2, v2, k3, v3, k4, v4, k5, v5);
}
// looking for of() with > 5 entries? Use the builder instead.
/**
* Returns a new builder. The generated builder is equivalent to the builder
* created by the {@link Builder} constructor.
*/
public static <K, V> Builder<K, V> builder() {
return new Builder<K, V>();
}
/**
* Multimap for {@link ImmutableMultimap.Builder} that maintains key and value
* orderings, allows duplicate values, and performs better than
* {@link LinkedListMultimap}.
*/
private static class BuilderMultimap<K, V> extends AbstractMapBasedMultimap<K, V> {
BuilderMultimap() {
super(new LinkedHashMap<K, Collection<V>>());
}
@Override
Collection<V> createCollection() {
return Lists.newArrayList();
}
private static final long serialVersionUID = 0;
}
/**
* A builder for creating immutable multimap instances, especially
* {@code public static final} multimaps ("constant multimaps"). Example:
*
* <pre>
* {
* &#64;code
*
* static final Multimap<String, Integer> STRING_TO_INTEGER_MULTIMAP = new ImmutableMultimap.Builder<String, Integer>()
* .put("one", 1).putAll("several", 1, 2, 3).putAll("many", 1, 2, 3, 4, 5).build();
* }
* </pre>
*
* <p>
* Builder instances can be reused; it is safe to call {@link #build} multiple
* times to build multiple multimaps in series. Each multimap contains the
* key-value mappings in the previously created multimaps.
*
* @since 2.0 (imported from Google Collections Library)
*/
public static class Builder<K, V> {
Multimap<K, V> builderMultimap = new BuilderMultimap<K, V>();
Comparator<? super K> keyComparator;
Comparator<? super V> valueComparator;
/**
* Creates a new builder. The returned builder is equivalent to the builder
* generated by {@link ImmutableMultimap#builder}.
*/
public Builder() {
}
/**
* Adds a key-value mapping to the built multimap.
*/
public Builder<K, V> put(K key, V value) {
checkEntryNotNull(key, value);
builderMultimap.put(key, value);
return this;
}
/**
* Adds an entry to the built multimap.
*
* @since 11.0
*/
public Builder<K, V> put(Entry<? extends K, ? extends V> entry) {
return put(entry.getKey(), entry.getValue());
}
/**
* Stores a collection of values with the same key in the built multimap.
*
* @throws NullPointerException if {@code key}, {@code values}, or any element
* in {@code values} is null. The builder is left
* in an invalid state.
*/
public Builder<K, V> putAll(K key, Iterable<? extends V> values) {
if (key == null) {
throw new NullPointerException("null key in entry: null=" + Iterables.toString(values));
}
Collection<V> valueList = builderMultimap.get(key);
for (V value : values) {
checkEntryNotNull(key, value);
valueList.add(value);
}
return this;
}
/**
* Stores an array of values with the same key in the built multimap.
*
* @throws NullPointerException if the key or any value is null. The builder is
* left in an invalid state.
*/
public Builder<K, V> putAll(K key, V... values) {
return putAll(key, Arrays.asList(values));
}
/**
* Stores another multimap's entries in the built multimap. The generated
* multimap's key and value orderings correspond to the iteration ordering of
* the {@code multimap.asMap()} view, with new keys and values following any
* existing keys and values.
*
* @throws NullPointerException if any key or value in {@code multimap} is null.
* The builder is left in an invalid state.
*/
public Builder<K, V> putAll(Multimap<? extends K, ? extends V> multimap) {
for (Entry<? extends K, ? extends Collection<? extends V>> entry : multimap.asMap().entrySet()) {
putAll(entry.getKey(), entry.getValue());
}
return this;
}
/**
* Specifies the ordering of the generated multimap's keys.
*
* @since 8.0
*/
public Builder<K, V> orderKeysBy(Comparator<? super K> keyComparator) {
this.keyComparator = checkNotNull(keyComparator);
return this;
}
/**
* Specifies the ordering of the generated multimap's values for each key.
*
* @since 8.0
*/
public Builder<K, V> orderValuesBy(Comparator<? super V> valueComparator) {
this.valueComparator = checkNotNull(valueComparator);
return this;
}
/**
* Returns a newly-created immutable multimap.
*/
public ImmutableMultimap<K, V> build() {
if (valueComparator != null) {
for (Collection<V> values : builderMultimap.asMap().values()) {
List<V> list = (List<V>) values;
Collections.sort(list, valueComparator);
}
}
if (keyComparator != null) {
Multimap<K, V> sortedCopy = new BuilderMultimap<K, V>();
List<Map.Entry<K, Collection<V>>> entries = Lists.newArrayList(builderMultimap.asMap().entrySet());
Collections.sort(entries, Ordering.from(keyComparator).<K>onKeys());
for (Map.Entry<K, Collection<V>> entry : entries) {
sortedCopy.putAll(entry.getKey(), entry.getValue());
}
builderMultimap = sortedCopy;
}
return copyOf(builderMultimap);
}
}
/**
* Returns an immutable multimap containing the same mappings as {@code
* multimap}. The generated multimap's key and value orderings correspond to the
* iteration ordering of the {@code multimap.asMap()} view.
*
* <p>
* Despite the method name, this method attempts to avoid actually copying the
* data when it is safe to do so. The exact circumstances under which a copy
* will or will not be performed are undocumented and subject to change.
*
* @throws NullPointerException if any key or value in {@code multimap} is null
*/
public static <K, V> ImmutableMultimap<K, V> copyOf(Multimap<? extends K, ? extends V> multimap) {
if (multimap instanceof ImmutableMultimap) {
@SuppressWarnings("unchecked") // safe since multimap is not writable
ImmutableMultimap<K, V> kvMultimap = (ImmutableMultimap<K, V>) multimap;
if (!kvMultimap.isPartialView()) {
return kvMultimap;
}
}
return ImmutableListMultimap.copyOf(multimap);
}
final transient ImmutableMap<K, ? extends ImmutableCollection<V>> map;
final transient int size;
// These constants allow the deserialization code to set final fields. This
// holder class makes sure they are not initialized unless an instance is
// deserialized.
@GwtIncompatible("java serialization is not supported")
static class FieldSettersHolder {
static final Serialization.FieldSetter<ImmutableMultimap> MAP_FIELD_SETTER = Serialization
.getFieldSetter(ImmutableMultimap.class, "map");
static final Serialization.FieldSetter<ImmutableMultimap> SIZE_FIELD_SETTER = Serialization
.getFieldSetter(ImmutableMultimap.class, "size");
static final Serialization.FieldSetter<ImmutableSetMultimap> EMPTY_SET_FIELD_SETTER = Serialization
.getFieldSetter(ImmutableSetMultimap.class, "emptySet");
}
ImmutableMultimap(ImmutableMap<K, ? extends ImmutableCollection<V>> map, int size) {
this.map = map;
this.size = size;
}
// mutators (not supported)
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public ImmutableCollection<V> removeAll(Object key) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public ImmutableCollection<V> replaceValues(K key, Iterable<? extends V> values) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public void clear() {
throw new UnsupportedOperationException();
}
/**
* Returns an immutable collection of the values for the given key. If no
* mappings in the multimap have the provided key, an empty immutable collection
* is returned. The values are in the same order as the parameters used to build
* this multimap.
*/
@Override
public abstract ImmutableCollection<V> get(K key);
/**
* Returns an immutable multimap which is the inverse of this one. For every
* key-value mapping in the original, the result will have a mapping with key
* and value reversed.
*
* @since 11.0
*/
public abstract ImmutableMultimap<V, K> inverse();
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public boolean put(K key, V value) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public boolean putAll(K key, Iterable<? extends V> values) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public boolean putAll(Multimap<? extends K, ? extends V> multimap) {
throw new UnsupportedOperationException();
}
/**
* Guaranteed to throw an exception and leave the multimap unmodified.
*
* @throws UnsupportedOperationException always
* @deprecated Unsupported operation.
*/
@Deprecated
@Override
public boolean remove(Object key, Object value) {
throw new UnsupportedOperationException();
}
/**
* Returns {@code true} if this immutable multimap's implementation contains
* references to user-created objects that aren't accessible via this multimap's
* methods. This is generally used to determine whether {@code copyOf}
* implementations should make an explicit copy to avoid memory leaks.
*/
boolean isPartialView() {
return map.isPartialView();
}
// accessors
@Override
public boolean containsKey(@Nullable Object key) {
return map.containsKey(key);
}
@Override
public boolean containsValue(@Nullable Object value) {
return value != null && super.containsValue(value);
}
@Override
public int size() {
return size;
}
// views
/**
* Returns an immutable set of the distinct keys in this multimap. These keys
* are ordered according to when they first appeared during the construction of
* this multimap.
*/
@Override
public ImmutableSet<K> keySet() {
return map.keySet();
}
/**
* Returns an immutable map that associates each key with its corresponding
* values in the multimap.
*/
@Override
@SuppressWarnings("unchecked") // a widening cast
public ImmutableMap<K, Collection<V>> asMap() {
return (ImmutableMap) map;
}
@Override
Map<K, Collection<V>> createAsMap() {
throw new AssertionError("should never be called");
}
/**
* Returns an immutable collection of all key-value pairs in the multimap. Its
* iterator traverses the values for the first key, the values for the second
* key, and so on.
*/
@Override
public ImmutableCollection<Entry<K, V>> entries() {
return (ImmutableCollection<Entry<K, V>>) super.entries();
}
@Override
ImmutableCollection<Entry<K, V>> createEntries() {
return new EntryCollection<K, V>(this);
}
private static class EntryCollection<K, V> extends ImmutableCollection<Entry<K, V>> {
final ImmutableMultimap<K, V> multimap;
EntryCollection(ImmutableMultimap<K, V> multimap) {
this.multimap = multimap;
}
@Override
public UnmodifiableIterator<Entry<K, V>> iterator() {
return multimap.entryIterator();
}
@Override
boolean isPartialView() {
return multimap.isPartialView();
}
@Override
public int size() {
return multimap.size();
}
@Override
public boolean contains(Object object) {
if (object instanceof Entry) {
Entry<?, ?> entry = (Entry<?, ?>) object;
return multimap.containsEntry(entry.getKey(), entry.getValue());
}
return false;
}
private static final long serialVersionUID = 0;
}
private abstract class Itr<T> extends UnmodifiableIterator<T> {
final Iterator<Entry<K, Collection<V>>> mapIterator = asMap().entrySet().iterator();
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;
}