Package org.apache.wayang.core.util

Class MultiMap<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<K,Set<V>>

org.apache.wayang.core.util.MultiMap<K,V>

All Implemented Interfaces:

Serializable, Cloneable, Map<K,Set<V>>

public class MultiMap<K,V>
extends HashMap<K,Set<V>>

Maps keys to multiple values. Each key value pair is unique.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K extends Object,V extends Object>, AbstractMap.SimpleImmutableEntry<K extends Object,V extends Object>

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

Map.Entry<K extends Object,V extends Object>

Constructor Summary

Constructors

Constructor	Description
MultiMap()

Method Summary

Modifier and Type	Method	Description
boolean	putSingle(K key, V value)	Associate a key with a new value.
boolean	removeSingle(K key, V value)	Disassociate a key with a value.

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, get, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, remove, remove, replace, replace, replaceAll, size, values

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Details

MultiMap

public MultiMap()

Method Details

putSingle

public boolean putSingle(K key,
 V value)

Associate a key with a new value.

Parameters:

key - to associate with

value - will be associated

Returns:

whether the value was not yet associated with the key

removeSingle

public boolean removeSingle(K key,
 V value)

Disassociate a key with a value.

Parameters:

key - to disassociate from

value - will be disassociated

Returns:

whether the value was associated with the key