com.diffplug.common.collect

Class ImmutableMultimap.Builder<K,V>

java.lang.Object

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

Direct Known Subclasses:

ImmutableListMultimap.Builder, ImmutableSetMultimap.Builder

Enclosing class:

ImmutableMultimap<K,V>

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

Constructor Summary

Constructors

Constructor and Description
Builder() Creates a new builder.

Method Summary

Modifier and Type	Method and Description
ImmutableMultimap<K,V>	build() Returns a newly-created immutable multimap.
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(K key, V value) Adds a key-value mapping to the built multimap.
ImmutableMultimap.Builder<K,V>	put(Map.Entry<? extends K,? extends V> entry) Adds an entry to 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.
ImmutableMultimap.Builder<K,V>	putAll(Multimap<? extends K,? extends V> multimap) Stores another multimap’s entries in the built multimap.

Methods inherited from class java.lang.Object

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

Constructor Detail

Builder

public Builder()

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

Method Detail

put

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

Adds a key-value mapping to the built multimap.

put

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

Adds an entry to the built multimap.

Since:

11.0

putAll

@Beta
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

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

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

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

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

Specifies the ordering of the generated multimap’s keys.

Since:

8.0

orderValuesBy

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.