cz.cuni.amis.utils.maps

Class HashMapSet<KEY,ITEM>

java.lang.Object

java.util.AbstractMap<K,V>

java.util.HashMap<KEY,Set<ITEM>>

cz.cuni.amis.utils.maps.HashMapSet<KEY,ITEM>

Type Parameters:

KEY -

ITEM -

All Implemented Interfaces:

Serializable, Cloneable, Map<KEY,Set<ITEM>>

public class HashMapSet<KEY,ITEM>
extends HashMap<KEY,Set<ITEM>>

Map containing sets. Whenever a set under some key is requested and does not exists, the HashMapSet automatically creates new one.

The implementation is unsynchronized, created sets are synchronized (just iteration over the set must be synchronized by the user as described in Java(tm) documentation).

Author:

Jimmy

See Also:

Serialized Form

Nested Class Summary

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

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

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
HashMapSet()

Method Summary

Modifier and Type	Method and Description
void	add(KEY key, ITEM item) Adds the item into the set under the key.
boolean	contains(KEY key, ITEM item) Tests whether an 'item' is inside the set under 'key'.
Set<ITEM>	get(Object primaryKey) The get method ensures that the requested set under primaryKey always exists!
Set<ITEM>	remove(Object key) Remove returns the removed item, if item was non-existent, it returns empty set.
boolean	removeItem(Object key, Object item) Removes the item from the set under the key.

Methods inherited from class java.util.HashMap

clear, clone, compute, computeIfAbsent, computeIfPresent, containsKey, containsValue, entrySet, forEach, getOrDefault, isEmpty, keySet, merge, put, putAll, putIfAbsent, 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 Detail

HashMapSet

public HashMapSet()

Method Detail

get

public Set<ITEM> get(Object primaryKey)

The get method ensures that the requested set under primaryKey always exists!

Specified by:

get in interface Map<KEY,Set<ITEM>>

Overrides:

get in class HashMap<KEY,Set<ITEM>>

Parameters:

primaryKey - must be instance of PRIMARY_KEY

add

public void add(KEY key,
                ITEM item)

Adds the item into the set under the key.

Parameters:

key -

item -

remove

public Set<ITEM> remove(Object key)

Remove returns the removed item, if item was non-existent, it returns empty set.

Specified by:

remove in interface Map<KEY,Set<ITEM>>

Overrides:

remove in class HashMap<KEY,Set<ITEM>>

Parameters:

primaryKey -

Returns:

removeItem

public boolean removeItem(Object key,
                          Object item)

Removes the item from the set under the key.

Parameters:

key -

item -

contains

public boolean contains(KEY key,
                        ITEM item)

Tests whether an 'item' is inside the set under 'key'.

Parameters:

key -

item -

Returns: