Package org.supercsv.util
Class TwoDHashMap<K1,K2,V>
java.lang.Object
org.supercsv.util.TwoDHashMap<K1,K2,V>
- Type Parameters:
K1
- the first key typeK2
- the second key typeV
- the value type
A two-dimensional hashmap, is a HashMap that enables you to refer to values via two keys rather than one. The
underlying implementation is simply a HashMap containing HashMap, each of which maps to values.
- Since:
- 2.0.0 (migrated from Spiffy 0.5)
- See Also:
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Field Summary
Fields -
Constructor Summary
ConstructorsConstructorDescriptionConstructs a new TwoDHashMap.Constructs a new TwoDHashMap using the supplied map. -
Method Summary
Modifier and TypeMethodDescriptionboolean
containsKey
(K1 firstKey, K2 secondKey) Existence check of a value (or null) mapped to the keys.Fetch a value from the Hashmap .keySet()
Returns a set of the keys of the outermost map.Insert a valueint
size()
Returns the number of key-value mappings in this map for the first key.int
Returns the number of key-value mappings in this map for the second key.
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Field Details
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map
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Constructor Details
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TwoDHashMap
public TwoDHashMap()Constructs a new TwoDHashMap. -
TwoDHashMap
Constructs a new TwoDHashMap using the supplied map.- Parameters:
map
- the map- Throws:
NullPointerException
- if map is null
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Method Details
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containsKey
Existence check of a value (or null) mapped to the keys.- Parameters:
firstKey
- first keysecondKey
- second key- Returns:
- true when an element (or null) has been stored with the keys
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get
Fetch a value from the Hashmap .- Parameters:
firstKey
- first keysecondKey
- second key- Returns:
- the element or null.
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set
Insert a value- Parameters:
firstKey
- first keysecondKey
- second keyvalue
- the value to be inserted. null may be inserted as well.- Returns:
- null or the value the insert is replacing.
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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.
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size
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.
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keySet
Returns a set of the keys of the outermost map.- Returns:
- the key set for the outermost map
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