it.unimi.dsi.fastutil.ints.Int2IntMaps Maven / Gradle / Ivy
Show all versions of fastutil-core Show documentation
/*
* Copyright (C) 2002-2021 Sebastiano Vigna
*
* 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 it.unimi.dsi.fastutil.ints;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import it.unimi.dsi.fastutil.objects.ObjectIterable;
import it.unimi.dsi.fastutil.objects.ObjectSpliterator;
import it.unimi.dsi.fastutil.objects.ObjectSet;
import it.unimi.dsi.fastutil.objects.ObjectSets;
import java.util.Map;
import java.util.function.Consumer;
import it.unimi.dsi.fastutil.ints.Int2IntMap.FastEntrySet;
/**
* A class providing static methods and objects that do useful things with
* type-specific maps.
*
* @see java.util.Collections
*/
public final class Int2IntMaps {
private Int2IntMaps() {
}
/**
* Returns an iterator that will be {@linkplain FastEntrySet fast}, if possible,
* on the {@linkplain Map#entrySet() entry set} of the provided {@code map}.
*
* @param map
* a map from which we will try to extract a (fast) iterator on the
* entry set.
* @return an iterator on the entry set of the given map that will be fast, if
* possible.
* @since 8.0.0
*/
public static ObjectIterator fastIterator(Int2IntMap map) {
final ObjectSet entries = map.int2IntEntrySet();
return entries instanceof Int2IntMap.FastEntrySet
? ((Int2IntMap.FastEntrySet) entries).fastIterator()
: entries.iterator();
}
/**
* Iterates {@linkplain FastEntrySet#fastForEach(Consumer) quickly}, if
* possible, on the {@linkplain Map#entrySet() entry set} of the provided
* {@code map}.
*
* @param map
* a map on which we will try to iterate
* {@linkplain FastEntrySet#fastForEach(Consumer) quickly}.
* @param consumer
* the consumer that will be passed to
* {@link FastEntrySet#fastForEach(Consumer)}, if possible, or to
* {@link Iterable#forEach(Consumer)}.
* @since 8.1.0
*/
public static void fastForEach(Int2IntMap map, final Consumer consumer) {
final ObjectSet entries = map.int2IntEntrySet();
if (entries instanceof Int2IntMap.FastEntrySet)
((Int2IntMap.FastEntrySet) entries).fastForEach(consumer);
else
entries.forEach(consumer);
}
/**
* Returns an iterable yielding an iterator that will be
* {@linkplain FastEntrySet fast}, if possible, on the
* {@linkplain Map#entrySet() entry set} of the provided {@code map}.
*
* @param map
* a map from which we will try to extract an iterable yielding a
* (fast) iterator on the entry set.
* @return an iterable yielding an iterator on the entry set of the given map
* that will be fast, if possible.
* @since 8.0.0
*/
public static ObjectIterable fastIterable(Int2IntMap map) {
final ObjectSet entries = map.int2IntEntrySet();
return entries instanceof Int2IntMap.FastEntrySet ? new ObjectIterable() {
@Override
public ObjectIterator iterator() {
return ((Int2IntMap.FastEntrySet) entries).fastIterator();
}
@Override
public ObjectSpliterator spliterator() {
return entries.spliterator();
}
@Override
public void forEach(final Consumer consumer) {
((Int2IntMap.FastEntrySet) entries).fastForEach(consumer);
}
} : entries;
}
/**
* An immutable class representing an empty type-specific map.
*
*
* This class may be useful to implement your own in case you subclass a
* type-specific map.
*/
public static class EmptyMap extends Int2IntFunctions.EmptyFunction
implements
Int2IntMap,
java.io.Serializable,
Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected EmptyMap() {
}
@Override
public boolean containsValue(final int v) {
return false;
}
@Deprecated
@Override
public Integer getOrDefault(final Object key, final Integer defaultValue) {
return defaultValue;
}
@Override
public int getOrDefault(final int key, final int defaultValue) {
return defaultValue;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean containsValue(final Object ov) {
return false;
}
@Override
public void putAll(final Map m) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("unchecked")
@Override
public ObjectSet int2IntEntrySet() {
return ObjectSets.EMPTY_SET;
}
@Override
public IntSet keySet() {
return IntSets.EMPTY_SET;
}
@Override
public IntCollection values() {
return IntSets.EMPTY_SET;
}
@Override
public void forEach(final java.util.function.BiConsumer consumer) {
}
@Override
public Object clone() {
return EMPTY_MAP;
}
@Override
public boolean isEmpty() {
return true;
}
@Override
public int hashCode() {
return 0;
}
@Override
public boolean equals(final Object o) {
if (!(o instanceof Map))
return false;
return ((Map) o).isEmpty();
}
@Override
public String toString() {
return "{}";
}
}
/**
* An empty type-specific map (immutable). It is serializable and cloneable.
*/
public static final EmptyMap EMPTY_MAP = new EmptyMap();
/**
* An immutable class representing a type-specific singleton map.
*
*
* This class may be useful to implement your own in case you subclass a
* type-specific map.
*/
public static class Singleton extends Int2IntFunctions.Singleton
implements
Int2IntMap,
java.io.Serializable,
Cloneable {
private static final long serialVersionUID = -7046029254386353129L;
protected transient ObjectSet entries;
protected transient IntSet keys;
protected transient IntCollection values;
protected Singleton(final int key, final int value) {
super(key, value);
}
@Override
public boolean containsValue(final int v) {
return ((value) == (v));
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean containsValue(final Object ov) {
return ((((Integer) (ov)).intValue()) == (value));
}
@Override
public void putAll(final Map m) {
throw new UnsupportedOperationException();
}
@Override
public ObjectSet int2IntEntrySet() {
if (entries == null)
entries = ObjectSets.singleton(new AbstractInt2IntMap.BasicEntry(key, value));
return entries;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public ObjectSet> entrySet() {
return (ObjectSet) int2IntEntrySet();
}
@Override
public IntSet keySet() {
if (keys == null)
keys = IntSets.singleton(key);
return keys;
}
@Override
public IntCollection values() {
if (values == null)
values = IntSets.singleton(value);
return values;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public int hashCode() {
return (key) ^ (value);
}
@Override
public boolean equals(final Object o) {
if (o == this)
return true;
if (!(o instanceof Map))
return false;
Map m = (Map) o;
if (m.size() != 1)
return false;
return m.entrySet().iterator().next().equals(entrySet().iterator().next());
}
@Override
public String toString() {
return "{" + key + "=>" + value + "}";
}
}
/**
* Returns a type-specific immutable map containing only the specified pair. The
* returned map is serializable and cloneable.
*
*
* Note that albeit the returned map is immutable, its default return value may
* be changed.
*
* @param key
* the only key of the returned map.
* @param value
* the only value of the returned map.
* @return a type-specific immutable map containing just the pair
* {@code <key,value>}.
*/
public static Int2IntMap singleton(final int key, int value) {
return new Singleton(key, value);
}
/**
* Returns a type-specific immutable map containing only the specified pair. The
* returned map is serializable and cloneable.
*
*
* Note that albeit the returned map is immutable, its default return value may
* be changed.
*
* @param key
* the only key of the returned map.
* @param value
* the only value of the returned map.
* @return a type-specific immutable map containing just the pair
* {@code <key,value>}.
*/
public static Int2IntMap singleton(final Integer key, final Integer value) {
return new Singleton((key).intValue(), (value).intValue());
}
/** A synchronized wrapper class for maps. */
public static class SynchronizedMap extends Int2IntFunctions.SynchronizedFunction
implements
Int2IntMap,
java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Int2IntMap map;
protected transient ObjectSet entries;
protected transient IntSet keys;
protected transient IntCollection values;
protected SynchronizedMap(final Int2IntMap m, final Object sync) {
super(m, sync);
this.map = m;
}
protected SynchronizedMap(final Int2IntMap m) {
super(m);
this.map = m;
}
@Override
public boolean containsValue(final int v) {
synchronized (sync) {
return map.containsValue(v);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean containsValue(final Object ov) {
synchronized (sync) {
return map.containsValue(ov);
}
}
@Override
public void putAll(final Map m) {
synchronized (sync) {
map.putAll(m);
}
}
@Override
public ObjectSet int2IntEntrySet() {
synchronized (sync) {
if (entries == null)
entries = ObjectSets.synchronize(map.int2IntEntrySet(), sync);
return entries;
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
@SuppressWarnings({"unchecked", "rawtypes"})
public ObjectSet> entrySet() {
return (ObjectSet) int2IntEntrySet();
}
@Override
public IntSet keySet() {
synchronized (sync) {
if (keys == null)
keys = IntSets.synchronize(map.keySet(), sync);
return keys;
}
}
@Override
public IntCollection values() {
synchronized (sync) {
if (values == null)
values = IntCollections.synchronize(map.values(), sync);
return values;
}
}
@Override
public boolean isEmpty() {
synchronized (sync) {
return map.isEmpty();
}
}
@Override
public int hashCode() {
synchronized (sync) {
return map.hashCode();
}
}
@Override
public boolean equals(final Object o) {
if (o == this)
return true;
synchronized (sync) {
return map.equals(o);
}
}
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
synchronized (sync) {
s.defaultWriteObject();
}
}
// Defaultable methods
@Override
public int getOrDefault(final int key, final int defaultValue) {
synchronized (sync) {
return map.getOrDefault(key, defaultValue);
}
}
@Override
public void forEach(final java.util.function.BiConsumer action) {
synchronized (sync) {
map.forEach(action);
}
}
@Override
public void replaceAll(
final java.util.function.BiFunction function) {
synchronized (sync) {
map.replaceAll(function);
}
}
@Override
public int putIfAbsent(final int key, final int value) {
synchronized (sync) {
return map.putIfAbsent(key, value);
}
}
@Override
public boolean remove(final int key, final int value) {
synchronized (sync) {
return map.remove(key, value);
}
}
@Override
public int replace(final int key, final int value) {
synchronized (sync) {
return map.replace(key, value);
}
}
@Override
public boolean replace(final int key, final int oldValue, final int newValue) {
synchronized (sync) {
return map.replace(key, oldValue, newValue);
}
}
@Override
public int computeIfAbsent(final int key, final java.util.function.IntUnaryOperator mappingFunction) {
synchronized (sync) {
return map.computeIfAbsent(key, mappingFunction);
}
}
@Override
public int computeIfAbsentNullable(final int key,
final java.util.function.IntFunction mappingFunction) {
synchronized (sync) {
return map.computeIfAbsentNullable(key, mappingFunction);
}
}
@Override
public int computeIfAbsent(final int key, final Int2IntFunction mappingFunction) {
synchronized (sync) {
return map.computeIfAbsent(key, mappingFunction);
}
}
@Override
public int computeIfPresent(final int key,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.computeIfPresent(key, remappingFunction);
}
}
@Override
public int compute(final int key,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.compute(key, remappingFunction);
}
}
@Override
public int merge(final int key, final int value,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.merge(key, value, remappingFunction);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer getOrDefault(final Object key, final Integer defaultValue) {
synchronized (sync) {
return map.getOrDefault(key, defaultValue);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean remove(final Object key, final Object value) {
synchronized (sync) {
return map.remove(key, value);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer replace(final Integer key, final Integer value) {
synchronized (sync) {
return map.replace(key, value);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean replace(final Integer key, final Integer oldValue, final Integer newValue) {
synchronized (sync) {
return map.replace(key, oldValue, newValue);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer putIfAbsent(final Integer key, final Integer value) {
synchronized (sync) {
return map.putIfAbsent(key, value);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer computeIfAbsent(final Integer key,
final java.util.function.Function mappingFunction) {
synchronized (sync) {
return map.computeIfAbsent(key, mappingFunction);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer computeIfPresent(final Integer key,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.computeIfPresent(key, remappingFunction);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer compute(final Integer key,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.compute(key, remappingFunction);
}
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer merge(final Integer key, final Integer value,
final java.util.function.BiFunction remappingFunction) {
synchronized (sync) {
return map.merge(key, value, remappingFunction);
}
}
}
/**
* Returns a synchronized type-specific map backed by the given type-specific
* map.
*
* @param m
* the map to be wrapped in a synchronized map.
* @return a synchronized view of the specified map.
* @see java.util.Collections#synchronizedMap(Map)
*/
public static Int2IntMap synchronize(final Int2IntMap m) {
return new SynchronizedMap(m);
}
/**
* Returns a synchronized type-specific map backed by the given type-specific
* map, using an assigned object to synchronize.
*
* @param m
* the map to be wrapped in a synchronized map.
* @param sync
* an object that will be used to synchronize the access to the map.
* @return a synchronized view of the specified map.
* @see java.util.Collections#synchronizedMap(Map)
*/
public static Int2IntMap synchronize(final Int2IntMap m, final Object sync) {
return new SynchronizedMap(m, sync);
}
/** An unmodifiable wrapper class for maps. */
public static class UnmodifiableMap extends Int2IntFunctions.UnmodifiableFunction
implements
Int2IntMap,
java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
protected final Int2IntMap map;
protected transient ObjectSet entries;
protected transient IntSet keys;
protected transient IntCollection values;
protected UnmodifiableMap(final Int2IntMap m) {
super(m);
this.map = m;
}
@Override
public boolean containsValue(final int v) {
return map.containsValue(v);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean containsValue(final Object ov) {
return map.containsValue(ov);
}
@Override
public void putAll(final Map m) {
throw new UnsupportedOperationException();
}
@SuppressWarnings({"unchecked", "rawtypes"})
@Override
public ObjectSet int2IntEntrySet() {
if (entries == null)
entries = ObjectSets.unmodifiable((ObjectSet) map.int2IntEntrySet());
return entries;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@SuppressWarnings({"unchecked", "rawtypes"})
@Override
public ObjectSet> entrySet() {
return (ObjectSet) int2IntEntrySet();
}
@Override
public IntSet keySet() {
if (keys == null)
keys = IntSets.unmodifiable(map.keySet());
return keys;
}
@Override
public IntCollection values() {
if (values == null)
values = IntCollections.unmodifiable(map.values());
return values;
}
@Override
public boolean isEmpty() {
return map.isEmpty();
}
@Override
public int hashCode() {
return map.hashCode();
}
@Override
public boolean equals(final Object o) {
if (o == this)
return true;
return map.equals(o);
}
// Defaultable methods
@Override
public int getOrDefault(final int key, final int defaultValue) {
return map.getOrDefault(key, defaultValue);
}
@Override
public void forEach(final java.util.function.BiConsumer action) {
map.forEach(action);
}
@Override
public void replaceAll(
final java.util.function.BiFunction function) {
throw new UnsupportedOperationException();
}
@Override
public int putIfAbsent(final int key, final int value) {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(final int key, final int value) {
throw new UnsupportedOperationException();
}
@Override
public int replace(final int key, final int value) {
throw new UnsupportedOperationException();
}
@Override
public boolean replace(final int key, final int oldValue, final int newValue) {
throw new UnsupportedOperationException();
}
@Override
public int computeIfAbsent(final int key, final java.util.function.IntUnaryOperator mappingFunction) {
throw new UnsupportedOperationException();
}
@Override
public int computeIfAbsentNullable(final int key,
final java.util.function.IntFunction mappingFunction) {
throw new UnsupportedOperationException();
}
@Override
public int computeIfAbsent(final int key, final Int2IntFunction mappingFunction) {
throw new UnsupportedOperationException();
}
@Override
public int computeIfPresent(final int key,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
@Override
public int compute(final int key,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
@Override
public int merge(final int key, final int value,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer getOrDefault(final Object key, final Integer defaultValue) {
return map.getOrDefault(key, defaultValue);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean remove(final Object key, final Object value) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer replace(final Integer key, final Integer value) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean replace(final Integer key, final Integer oldValue, final Integer newValue) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer putIfAbsent(final Integer key, final Integer value) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer computeIfAbsent(final Integer key,
final java.util.function.Function mappingFunction) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer computeIfPresent(final Integer key,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer compute(final Integer key,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public Integer merge(final Integer key, final Integer value,
final java.util.function.BiFunction remappingFunction) {
throw new UnsupportedOperationException();
}
}
/**
* Returns an unmodifiable type-specific map backed by the given type-specific
* map.
*
* @param m
* the map to be wrapped in an unmodifiable map.
* @return an unmodifiable view of the specified map.
* @see java.util.Collections#unmodifiableMap(Map)
*/
public static Int2IntMap unmodifiable(final Int2IntMap m) {
return new UnmodifiableMap(m);
}
}