com.google.common.collect

Class ImmutableMap<K,V>

java.lang.Object

com.google.common.collect.ImmutableMap<K,V>

All Implemented Interfaces:

Serializable, Map<K,V>

Direct Known Subclasses:

ImmutableBiMap, ImmutableSortedMap

@GwtCompatible(serializable=true,
               emulated=true)
public abstract class ImmutableMap<K,V>
extends Object
implements Map<K,V>, Serializable

A Map whose contents will never change, with many other important properties detailed at ImmutableCollection.

See the Guava User Guide article on immutable collections.

Since:

2.0

Author:

Jesse Wilson, Kevin Bourrillion

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ImmutableMap.Builder<K,V> A builder for creating immutable map instances, especially public static final maps ("constant maps").

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

Modifier and Type	Method and Description
ImmutableSetMultimap<K,V>	asMultimap() Returns a multimap view of the map.
static <K,V> ImmutableMap.Builder<K,V>	builder() Returns a new builder.
void	clear() Deprecated. Unsupported operation.
V	compute(K key, BiFunction<? super K,? super V,? extends V> remappingFunction) Deprecated. Unsupported operation.
V	computeIfAbsent(K key, Function<? super K,? extends V> mappingFunction) Deprecated. Unsupported operation.
V	computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction) Deprecated. Unsupported operation.
boolean	containsKey(Object key)
boolean	containsValue(Object value)
static <K,V> ImmutableMap<K,V>	copyOf(Iterable<? extends Map.Entry<? extends K,? extends V>> entries) Returns an immutable map containing the specified entries.
static <K,V> ImmutableMap<K,V>	copyOf(Map<? extends K,? extends V> map) Returns an immutable map containing the same entries as map.
ImmutableSet<Map.Entry<K,V>>	entrySet() Returns an immutable set of the mappings in this map.
boolean	equals(Object object)
abstract V	get(Object key)
V	getOrDefault(Object key, V defaultValue)
int	hashCode()
boolean	isEmpty()
ImmutableSet<K>	keySet() Returns an immutable set of the keys in this map.
V	merge(K key, V value, BiFunction<? super V,? super V,? extends V> remappingFunction) Deprecated. Unsupported operation.
static <K,V> ImmutableMap<K,V>	of() Returns the empty map.
static <K,V> ImmutableMap<K,V>	of(K k1, V v1) Returns an immutable map containing a single entry.
static <K,V> ImmutableMap<K,V>	of(K k1, V v1, K k2, V v2) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4) Returns an immutable map containing the given entries, in order.
static <K,V> ImmutableMap<K,V>	of(K k1, V v1, K k2, V v2, K k3, V v3, K k4, V v4, K k5, V v5) Returns an immutable map containing the given entries, in order.
V	put(K k, V v) Deprecated. Unsupported operation.
void	putAll(Map<? extends K,? extends V> map) Deprecated. Unsupported operation.
V	putIfAbsent(K key, V value) Deprecated. Unsupported operation.
V	remove(Object o) Deprecated. Unsupported operation.
boolean	remove(Object key, Object value) Deprecated. Unsupported operation.
V	replace(K key, V value) Deprecated. Unsupported operation.
boolean	replace(K key, V oldValue, V newValue) Deprecated. Unsupported operation.
void	replaceAll(BiFunction<? super K,? super V,? extends V> function) Deprecated. Unsupported operation.
static <T,K,V> Collector<T,?,ImmutableMap<K,V>>	toImmutableMap(Function<? super T,? extends K> keyFunction, Function<? super T,? extends V> valueFunction) Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements.
static <T,K,V> Collector<T,?,ImmutableMap<K,V>>	toImmutableMap(Function<? super T,? extends K> keyFunction, Function<? super T,? extends V> valueFunction, BinaryOperator<V> mergeFunction) Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements.
String	toString()
ImmutableCollection<V>	values() Returns an immutable collection of the values in this map.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

forEach, size

Method Detail

toImmutableMap

@Beta
public static <T,K,V> Collector<T,?,ImmutableMap<K,V>> toImmutableMap(Function<? super T,? extends K> keyFunction,
                                                                            Function<? super T,? extends V> valueFunction)

Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements. Entries appear in the result ImmutableMap in encounter order.

If the mapped keys contain duplicates (according to Object.equals(Object), an IllegalArgumentException is thrown when the collection operation is performed. (This differs from the Collector returned by Collectors.toMap(Function, Function), which throws an IllegalStateException.)

Since:

21.0

toImmutableMap

@Beta
public static <T,K,V> Collector<T,?,ImmutableMap<K,V>> toImmutableMap(Function<? super T,? extends K> keyFunction,
                                                                            Function<? super T,? extends V> valueFunction,
                                                                            BinaryOperator<V> mergeFunction)

Returns a Collector that accumulates elements into an ImmutableMap whose keys and values are the result of applying the provided mapping functions to the input elements.

If the mapped keys contain duplicates (according to Object.equals(Object)), the values are merged using the specified merging function. Entries will appear in the encounter order of the first occurrence of the key.

Since:

21.0

of

public static <K,V> ImmutableMap<K,V> of()

Returns the empty map. This map behaves and performs comparably to Collections.emptyMap(), and is preferable mainly for consistency and maintainability of your code.

of

public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1)

Returns an immutable map containing a single entry. This map behaves and performs comparably to Collections.singletonMap(K, V) but will not accept a null key or value. It is preferable mainly for consistency and maintainability of your code.

of

public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2)

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys are provided

of

public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3)

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys are provided

of

public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3,
                                         K k4,
                                         V v4)

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys are provided

of

public static <K,V> ImmutableMap<K,V> of(K k1,
                                         V v1,
                                         K k2,
                                         V v2,
                                         K k3,
                                         V v3,
                                         K k4,
                                         V v4,
                                         K k5,
                                         V v5)

Returns an immutable map containing the given entries, in order.

Throws:

IllegalArgumentException - if duplicate keys are provided

builder

public static <K,V> ImmutableMap.Builder<K,V> builder()

Returns a new builder. The generated builder is equivalent to the builder created by the ImmutableMap.Builder constructor.

copyOf

public static <K,V> ImmutableMap<K,V> copyOf(Map<? extends K,? extends V> map)

Returns an immutable map containing the same entries as map. If map somehow contains entries with duplicate keys (for example, if it is a SortedMap whose comparator is not consistent with equals), the results of this method are undefined.

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 map is null

copyOf

@Beta
public static <K,V> ImmutableMap<K,V> copyOf(Iterable<? extends Map.Entry<? extends K,? extends V>> entries)

Returns an immutable map containing the specified entries. The returned map iterates over entries in the same order as the original iterable.

Throws:

NullPointerException - if any key, value, or entry is null

IllegalArgumentException - if two entries have the same key

Since:

19.0

put

@Deprecated
public final V put(K k,
                               V v)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

put in interface Map<K,V>

Throws:

UnsupportedOperationException - always

putIfAbsent

@Deprecated
public final V putIfAbsent(K key,
                                       V value)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

putIfAbsent in interface Map<K,V>

Throws:

UnsupportedOperationException - always

replace

@Deprecated
public final boolean replace(K key,
                                         V oldValue,
                                         V newValue)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

replace in interface Map<K,V>

Throws:

UnsupportedOperationException - always

replace

@Deprecated
public final V replace(K key,
                                   V value)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

replace in interface Map<K,V>

Throws:

UnsupportedOperationException - always

computeIfAbsent

@Deprecated
public final V computeIfAbsent(K key,
                                           Function<? super K,? extends V> mappingFunction)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

computeIfAbsent in interface Map<K,V>

Throws:

UnsupportedOperationException - always

computeIfPresent

@Deprecated
public final V computeIfPresent(K key,
                                            BiFunction<? super K,? super V,? extends V> remappingFunction)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

computeIfPresent in interface Map<K,V>

Throws:

UnsupportedOperationException - always

compute

@Deprecated
public final V compute(K key,
                                   BiFunction<? super K,? super V,? extends V> remappingFunction)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

compute in interface Map<K,V>

Throws:

UnsupportedOperationException - always

merge

@Deprecated
public final V merge(K key,
                                 V value,
                                 BiFunction<? super V,? super V,? extends V> remappingFunction)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

merge in interface Map<K,V>

Throws:

UnsupportedOperationException - always

putAll

@Deprecated
public final void putAll(Map<? extends K,? extends V> map)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

putAll in interface Map<K,V>

Throws:

UnsupportedOperationException - always

replaceAll

@Deprecated
public final void replaceAll(BiFunction<? super K,? super V,? extends V> function)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

replaceAll in interface Map<K,V>

Throws:

UnsupportedOperationException - always

remove

@Deprecated
public final V remove(Object o)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

remove in interface Map<K,V>

Throws:

UnsupportedOperationException - always

remove

@Deprecated
public final boolean remove(Object key,
                                        Object value)

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

remove in interface Map<K,V>

Throws:

UnsupportedOperationException - always

clear

@Deprecated
public final void clear()

Deprecated. Unsupported operation.

Guaranteed to throw an exception and leave the map unmodified.

Specified by:

clear in interface Map<K,V>

Throws:

UnsupportedOperationException - always

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

containsKey

public boolean containsKey(@Nullable
                           Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(@Nullable
                             Object value)

Specified by:

containsValue in interface Map<K,V>

get

public abstract V get(@Nullable
                      Object key)

Specified by:

get in interface Map<K,V>

getOrDefault

public final V getOrDefault(@Nullable
                            Object key,
                            @Nullable
                            V defaultValue)

Specified by:

getOrDefault in interface Map<K,V>

entrySet

public ImmutableSet<Map.Entry<K,V>> entrySet()

Returns an immutable set of the mappings in this map. The entries are in the same order as the parameters used to build this map.

Specified by:

entrySet in interface Map<K,V>

keySet

public ImmutableSet<K> keySet()

Returns an immutable set of the keys in this map. These keys are in the same order as the parameters used to build this map.

Specified by:

keySet in interface Map<K,V>

values

public ImmutableCollection<V> values()

Returns an immutable collection of the values in this map. The values are in the same order as the parameters used to build this map.

Specified by:

values in interface Map<K,V>

asMultimap

public ImmutableSetMultimap<K,V> asMultimap()

Returns a multimap view of the map.

Since:

14.0

equals

public boolean equals(@Nullable
                      Object object)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Object

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object