org.supercsv.util

Class ThreeDHashMap<K1,K2,K3,V>

java.lang.Object

org.supercsv.util.ThreeDHashMap<K1,K2,K3,V>

Type Parameters:

K1 - the first key type

K2 - the second key type

K3 - the third key type

V - the value type

public class ThreeDHashMap<K1,K2,K3,V>
extends Object

A 3-dimensional HashMap is a HashMap that enables you to refer to values via three keys rather than one. The underlying implementation is simply a HashMap containing HashMap containing a HashMap, each of which maps to values.

Since:

2.0.0 (migrated from Spiffy 0.5)

Author:

Kasper B. Graversen

Constructor Summary

Constructors

Constructor and Description
ThreeDHashMap()

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(K1 firstKey, K2 secondKey) Existence check of a value (or null) mapped to the keys.
boolean	containsKey(K1 firstKey, K2 secondKey, K3 thirdKey) Existence check of a value (or null) mapped to the keys.
HashMap<K2,HashMap<K3,V>>	get(K1 firstKey) Fetch the outermost Hashmap.
HashMap<K3,V>	get(K1 firstKey, K2 secondKey) Fetch the innermost Hashmap.
V	get(K1 firstKey, K2 secondKey, K3 thirdKey) Fetch a value from the Hashmap.
TwoDHashMap<K2,K3,V>	getAs2d(K1 firstKey) Fetch the outermost Hashmap as a TwoDHashMap.
Set<K1>	keySet() Returns a set of the keys of the outermost map.
Object	set(K1 firstKey, K2 secondKey, K3 thirdKey, V value) Insert a value
int	size() Returns the number of key-value mappings in this map for the first key.
int	size(K1 firstKey) Returns the number of key-value mappings in this map for the second key.
int	size(K1 firstKey, K2 secondKey) Returns the number of key-value mappings in this map for the third key.

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreeDHashMap

public ThreeDHashMap()

Method Detail

containsKey

public boolean containsKey(K1 firstKey,
                           K2 secondKey)

Existence check of a value (or null) mapped to the keys.

Parameters:

firstKey - first key

secondKey - second key

Returns:

true when an element (or null) has been stored with the keys

containsKey

public boolean containsKey(K1 firstKey,
                           K2 secondKey,
                           K3 thirdKey)

Existence check of a value (or null) mapped to the keys.

Parameters:

firstKey - first key

secondKey - second key

thirdKey - third key

Returns:

true when an element (or null) has been stored with the keys

get

public HashMap<K2,HashMap<K3,V>> get(K1 firstKey)

Fetch the outermost Hashmap.

Parameters:

firstKey - first key

Returns:

the the innermost hashmap

getAs2d

public TwoDHashMap<K2,K3,V> getAs2d(K1 firstKey)

Fetch the outermost Hashmap as a TwoDHashMap.

Parameters:

firstKey - first key

Returns:

the the innermost hashmap

get

public HashMap<K3,V> get(K1 firstKey,
                         K2 secondKey)

Fetch the innermost Hashmap.

Parameters:

firstKey - first key

secondKey - second key

Returns:

the the innermost hashmap

get

public V get(K1 firstKey,
             K2 secondKey,
             K3 thirdKey)

Fetch a value from the Hashmap.

Parameters:

firstKey - first key

secondKey - second key

thirdKey - third key

Returns:

the element or null.

set

public Object set(K1 firstKey,
                  K2 secondKey,
                  K3 thirdKey,
                  V value)

Insert a value

Parameters:

firstKey - first key

secondKey - second key

thirdKey - third key

value - the value to be inserted. null may be inserted as well.

Returns:

null or the value the insert is replacing.

size

public int size()

Returns the number of key-value mappings in this map for the first key.

Returns:

Returns the number of key-value mappings in this map for the first key.

size

public int size(K1 firstKey)

Returns the number of key-value mappings in this map for the second key.

Parameters:

firstKey - the first key

Returns:

Returns the number of key-value mappings in this map for the second key.

size

public int size(K1 firstKey,
                K2 secondKey)

Returns the number of key-value mappings in this map for the third key.

Parameters:

firstKey - the first key

secondKey - the second key

Returns:

Returns the number of key-value mappings in this map for the third key.

keySet

public Set<K1> keySet()

Returns a set of the keys of the outermost map.

Returns:

the key set for the outermost map