Package gnu.trove.impl.hash
Class TCharHash
- java.lang.Object
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- gnu.trove.impl.hash.THash
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- gnu.trove.impl.hash.TPrimitiveHash
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- gnu.trove.impl.hash.TCharHash
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- All Implemented Interfaces:
java.io.Externalizable
,java.io.Serializable
- Direct Known Subclasses:
TCharHashSet
,TCharObjectHashMap
public abstract class TCharHash extends TPrimitiveHash
An open addressed hashing implementation for char primitives. Created: Sun Nov 4 08:56:06 2001- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description char[]
_set
the set of charsprotected boolean
consumeFreeSlot
protected char
no_entry_value
value that represents null NOTE: should not be modified after the Hash is created, but is not final because of Externalization-
Fields inherited from class gnu.trove.impl.hash.TPrimitiveHash
_states, FREE, FULL, REMOVED
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Fields inherited from class gnu.trove.impl.hash.THash
_autoCompactionFactor, _autoCompactRemovesRemaining, _autoCompactTemporaryDisable, _free, _loadFactor, _maxSize, _size, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR
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Constructor Summary
Constructors Constructor Description TCharHash()
Creates a newTCharHash
instance with the default capacity and load factor.TCharHash(int initialCapacity)
Creates a newTCharHash
instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.TCharHash(int initialCapacity, float loadFactor)
Creates a newTCharHash
instance with a prime value at or near the specified capacity and load factor.TCharHash(int initialCapacity, float loadFactor, char no_entry_value)
Creates a newTCharHash
instance with a prime value at or near the specified capacity and load factor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
contains(char val)
Searches the set for valboolean
forEach(TCharProcedure procedure)
Executes procedure for each element in the set.char
getNoEntryValue()
Returns the value that is used to represent null.protected int
index(char val)
Locates the index of val.protected int
insertKey(char val)
Locates the index at which val can be inserted.protected void
removeAt(int index)
Releases the element currently stored at index.protected int
setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.-
Methods inherited from class gnu.trove.impl.hash.TPrimitiveHash
capacity
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Methods inherited from class gnu.trove.impl.hash.THash
calculateGrownCapacity, clear, compact, computeMaxSize, computeNextAutoCompactionAmount, ensureCapacity, fastCeil, getAutoCompactionFactor, isEmpty, postInsertHook, readExternal, reenableAutoCompaction, rehash, saturatedCast, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize, writeExternal
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Constructor Detail
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TCharHash
public TCharHash()
Creates a newTCharHash
instance with the default capacity and load factor.
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TCharHash
public TCharHash(int initialCapacity)
Creates a newTCharHash
instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.- Parameters:
initialCapacity
- anint
value
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TCharHash
public TCharHash(int initialCapacity, float loadFactor)
Creates a newTCharHash
instance with a prime value at or near the specified capacity and load factor.- Parameters:
initialCapacity
- used to find a prime capacity for the table.loadFactor
- used to calculate the threshold over which rehashing takes place.
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TCharHash
public TCharHash(int initialCapacity, float loadFactor, char no_entry_value)
Creates a newTCharHash
instance with a prime value at or near the specified capacity and load factor.- Parameters:
initialCapacity
- used to find a prime capacity for the table.loadFactor
- used to calculate the threshold over which rehashing takes place.no_entry_value
- value that represents null
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Method Detail
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getNoEntryValue
public char getNoEntryValue()
Returns the value that is used to represent null. The default value is generally zero, but can be changed during construction of the collection.- Returns:
- the value that represents null
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setUp
protected int setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.- Overrides:
setUp
in classTPrimitiveHash
- Parameters:
initialCapacity
- anint
value- Returns:
- the actual capacity chosen
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contains
public boolean contains(char val)
Searches the set for val- Parameters:
val
- anchar
value- Returns:
- a
boolean
value
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forEach
public boolean forEach(TCharProcedure procedure)
Executes procedure for each element in the set.- Parameters:
procedure
- aTObjectProcedure
value- Returns:
- false if the loop over the set terminated because the procedure returned false for some value.
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removeAt
protected void removeAt(int index)
Releases the element currently stored at index.- Overrides:
removeAt
in classTPrimitiveHash
- Parameters:
index
- anint
value
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index
protected int index(char val)
Locates the index of val.- Parameters:
val
- anchar
value- Returns:
- the index of val or -1 if it isn't in the set.
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insertKey
protected int insertKey(char val)
Locates the index at which val can be inserted. if there is already a value equal()ing val in the set, returns that value as a negative integer.- Parameters:
val
- anchar
value- Returns:
- an
int
value
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