Class ImmutableMultimap.Builder<K,V>

java.lang.Object

com.google.common.collect.ImmutableMultimap.Builder<K,V>

Direct Known Subclasses:

ImmutableListMultimap.Builder, ImmutableSetMultimap.Builder

Enclosing class:

ImmutableMultimap<K,V>

@DoNotMock
public static class ImmutableMultimap.Builder<K,V>
extends Object

A builder for creating immutable multimap instances, especially public static final multimaps ("constant multimaps"). Example:

 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();
 

Builder instances can be reused; it is safe to call build() multiple times to build multiple multimaps in series. Each multimap contains the key-value mappings in the previously created multimaps.

Since:

2.0

Author:

Jared Levy

Constructor Summary

Constructors

Constructor	Description
Builder()	Creates a new builder.

Method Summary

Modifier and Type	Method	Description
ImmutableMultimap<K,V>	build()	Returns a newly-created immutable multimap.
ImmutableMultimap.Builder<K,V>	expectedValuesPerKey(int expectedValuesPerKey)	Provides a hint for how many values will be associated with each key newly added to the builder after this call.
ImmutableMultimap.Builder<K,V>	orderKeysBy(Comparator<? super K> keyComparator)	Specifies the ordering of the generated multimap's keys.
ImmutableMultimap.Builder<K,V>	orderValuesBy(Comparator<? super V> valueComparator)	Specifies the ordering of the generated multimap's values for each key.
ImmutableMultimap.Builder<K,V>	put(Map.Entry<? extends K,? extends V> entry)	Adds an entry to the built multimap.
ImmutableMultimap.Builder<K,V>	put(K key, V value)	Adds a key-value mapping to the built multimap.
ImmutableMultimap.Builder<K,V>	putAll(Multimap<? extends K,? extends V> multimap)	Stores another multimap's entries in the built multimap.
ImmutableMultimap.Builder<K,V>	putAll(Iterable<? extends Map.Entry<? extends K,? extends V>> entries)	Adds entries to the built multimap.
ImmutableMultimap.Builder<K,V>	putAll(K key, Iterable<? extends V> values)	Stores a collection of values with the same key in the built multimap.
ImmutableMultimap.Builder<K,V>	putAll(K key, V... values)	Stores an array of values with the same key in the built multimap.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Builder

public Builder()

Creates a new builder. The returned builder is equivalent to the builder generated by ImmutableMultimap.builder().

Method Details

expectedValuesPerKey

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> expectedValuesPerKey(int expectedValuesPerKey)

Provides a hint for how many values will be associated with each key newly added to the builder after this call. This does not change semantics, but may improve performance if expectedValuesPerKey is a good estimate.

This may be called more than once; each newly added key will use the most recent call to expectedValuesPerKey as its hint.

Throws:

IllegalArgumentException - if expectedValuesPerKey is negative

Since:

33.3.0

put

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> put(K key,
 V value)

Adds a key-value mapping to the built multimap.

put

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> put(Map.Entry<? extends K,? extends V> entry)

Adds an entry to the built multimap.

Since:

11.0

putAll

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> putAll(Iterable<? extends Map.Entry<? extends K,? extends V>> entries)

Adds entries to the built multimap.

Since:

19.0

putAll

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> putAll(K key,
 Iterable<? extends V> values)

Stores a collection of values with the same key in the built multimap.

Throws:

NullPointerException - if key, values, or any element in values is null. The builder is left in an invalid state.

putAll

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> putAll(K key,
 V... values)

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.

putAll

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> putAll(Multimap<? extends K,? extends V> multimap)

Stores another multimap's entries in the built multimap. The generated multimap's key and value orderings correspond to the iteration ordering of the multimap.asMap() view, with new keys and values following any existing keys and values.

Throws:

NullPointerException - if any key or value in multimap is null. The builder is left in an invalid state.

orderKeysBy

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> orderKeysBy(Comparator<? super K> keyComparator)

Specifies the ordering of the generated multimap's keys.

Since:

8.0

orderValuesBy

@CanIgnoreReturnValue
public ImmutableMultimap.Builder<K,V> orderValuesBy(Comparator<? super V> valueComparator)

Specifies the ordering of the generated multimap's values for each key.

Since:

8.0

build

public ImmutableMultimap<K,V> build()

Returns a newly-created immutable multimap.