net.sf.mmm.util.collection.base
Class HashMapFactory

java.lang.Object
  net.sf.mmm.util.collection.base.AbstractMapFactory
      net.sf.mmm.util.collection.base.HashMapFactory

All Implemented Interfaces:

MapFactory<Map>

public class HashMapFactory
extends AbstractMapFactory

This is an implementation of the MapFactory interface that creates instances of HashMap.

Since:

1.0.1

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Field Summary

static MapFactory<Map>

INSTANCE The singleton instance.

Constructor Summary

HashMapFactory()

Method Summary

<K,V> Map<K,V>	create() This method creates a new Map instance.
<K,V> Map<K,V>	create(int capacity) This method creates a new Map instance with the given capacity.
Class<HashMap>	getMapImplementation() This method gets the implementation of the map-interface used by this factory.

Methods inherited from class net.sf.mmm.util.collection.base.AbstractMapFactory

createGeneric, createGeneric, getMapInterface

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final MapFactory<Map> INSTANCE

The singleton instance.

Constructor Detail

HashMapFactory

public HashMapFactory()

Method Detail

getMapImplementation

public Class<HashMap> getMapImplementation()

This method gets the implementation of the map-interface used by this factory.

Returns:

the Map implementation.

create

public <K,V> Map<K,V> create()

This method creates a new Map instance.
It is explicitly typed and respects the generic key and value type of the map. Therefore the type of the Map can NOT be bound to the generic type <MAP> because of limitations in Java's generic type system. You need to work on the actual sub-interface (e.g. SortedMapFactory) to get a more specific result type.

Type Parameters:

K - the type of keys maintained by the map.

V - the type of mapped values.

Returns:

the new map instance.

create

public <K,V> Map<K,V> create(int capacity)

This method creates a new Map instance with the given capacity. For a regular map this will be the initial capacity while a cache may never grow beyond this capacity limit and if reached force out entries last recently of frequently used.

Type Parameters:

K - the type of keys maintained by the map.

V - the type of mapped values.

Parameters:

capacity - is the capacity of the map to create.

Returns:

the new map instance.