Package gnu.trove
Class TByteByteHashMap
java.lang.Object
gnu.trove.THash
gnu.trove.TPrimitiveHash
gnu.trove.TByteHash
gnu.trove.TByteByteHashMap
- All Implemented Interfaces:
TByteHashingStrategy
,Externalizable
,Serializable
,Cloneable
An open addressed Map implementation for byte keys and byte values.
Created: Sun Nov 4 08:52:45 2001
- Author:
- Eric D. Friedman
- See Also:
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Field Summary
FieldsFields inherited from class gnu.trove.TByteHash
_hashingStrategy, _set
Fields inherited from class gnu.trove.TPrimitiveHash
_states, FREE, FULL, REMOVED
Fields inherited from class gnu.trove.THash
_autoCompactionFactor, _autoCompactRemovesRemaining, _free, _loadFactor, _maxSize, _size, DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR
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Constructor Summary
ConstructorsConstructorDescriptionCreates a newTByteByteHashMap
instance with the default capacity and load factor.TByteByteHashMap
(int initialCapacity) Creates a newTByteByteHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.TByteByteHashMap
(int initialCapacity, float loadFactor) Creates a newTByteByteHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.TByteByteHashMap
(int initialCapacity, float loadFactor, TByteHashingStrategy strategy) Creates a newTByteByteHashMap
instance with a prime value at or near the specified capacity and load factor.TByteByteHashMap
(int initialCapacity, TByteHashingStrategy strategy) Creates a newTByteByteHashMap
instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.TByteByteHashMap
(TByteHashingStrategy strategy) Creates a newTByteByteHashMap
instance with the default capacity and load factor. -
Method Summary
Modifier and TypeMethodDescriptionbyte
adjustOrPutValue
(byte key, byte adjust_amount, byte put_amount) Adjusts the primitive value mapped to the key if the key is present in the map.boolean
adjustValue
(byte key, byte amount) Adjusts the primitive value mapped to key.void
clear()
Empties the map.clone()
boolean
containsKey
(byte key) checks for the present of key in the keys of the map.boolean
containsValue
(byte val) checks for the presence of val in the values of the map.boolean
Compares this map with another map for equality of their stored entries.boolean
forEachEntry
(TByteByteProcedure procedure) Executes procedure for each key/value entry in the map.boolean
forEachKey
(TByteProcedure procedure) Executes procedure for each key in the map.boolean
forEachValue
(TByteProcedure procedure) Executes procedure for each value in the map.byte
get
(byte key) retrieves the value for keybyte[]
Returns the values of the map.int
hashCode()
boolean
increment
(byte key) Increments the primitive value mapped to key by 1iterator()
byte[]
keys()
returns the keys of the map.byte[]
keys
(byte[] a) returns the keys of the map.byte
put
(byte key, byte value) Inserts a key/value pair into the map.void
putAll
(TByteByteHashMap map) Put all the entries from the given map into this map.byte
putIfAbsent
(byte key, byte value) Inserts a key/value pair into the map if the specified key is not already associated with a value.void
protected void
rehash
(int newCapacity) rehashes the map to the new capacity.byte
remove
(byte key) Deletes a key/value pair from the map.protected void
removeAt
(int index) removes the mapping at index from the map.boolean
retainEntries
(TByteByteProcedure procedure) Retains only those entries in the map for which the procedure returns a true value.protected int
setUp
(int initialCapacity) initializes the hashtable to a prime capacity which is at least initialCapacity + 1.toString()
void
transformValues
(TByteFunction function) Transform the values in this map using function.void
Methods inherited from class gnu.trove.TByteHash
computeHashCode, contains, forEach, index, insertionIndex
Methods inherited from class gnu.trove.TPrimitiveHash
capacity
Methods inherited from class gnu.trove.THash
calculateGrownCapacity, compact, ensureCapacity, getAutoCompactionFactor, isEmpty, postInsertHook, reenableAutoCompaction, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize
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Field Details
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_values
protected transient byte[] _valuesthe values of the map
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Constructor Details
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TByteByteHashMap
public TByteByteHashMap()Creates a newTByteByteHashMap
instance with the default capacity and load factor. -
TByteByteHashMap
public TByteByteHashMap(int initialCapacity) Creates a newTByteByteHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.- Parameters:
initialCapacity
- anint
value
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TByteByteHashMap
public TByteByteHashMap(int initialCapacity, float loadFactor) Creates a newTByteByteHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.- Parameters:
initialCapacity
- anint
valueloadFactor
- afloat
value
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TByteByteHashMap
Creates a newTByteByteHashMap
instance with the default capacity and load factor.- Parameters:
strategy
- used to compute hash codes and to compare keys.
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TByteByteHashMap
Creates a newTByteByteHashMap
instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.- Parameters:
initialCapacity
- anint
valuestrategy
- used to compute hash codes and to compare keys.
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TByteByteHashMap
Creates a newTByteByteHashMap
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.strategy
- used to compute hash codes and to compare keys.
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Method Details
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clone
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iterator
- Returns:
- a TByteByteIterator with access to this map's keys and values
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setUp
protected int setUp(int initialCapacity) initializes the hashtable to a prime capacity which is at least initialCapacity + 1. -
put
public byte put(byte key, byte value) Inserts a key/value pair into the map.- Parameters:
key
- anbyte
valuevalue
- anbyte
value- Returns:
- the previous value associated with key, or (byte)0 if none was found.
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putIfAbsent
public byte putIfAbsent(byte key, byte value) Inserts a key/value pair into the map if the specified key is not already associated with a value.- Parameters:
key
- anbyte
valuevalue
- anbyte
value- Returns:
- the previous value associated with key, or (byte)0 if none was found.
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putAll
Put all the entries from the given map into this map.- Parameters:
map
- The map from which entries will be obtained to put into this map.
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rehash
protected void rehash(int newCapacity) rehashes the map to the new capacity. -
get
public byte get(byte key) retrieves the value for key- Parameters:
key
- anbyte
value- Returns:
- the value of key or (byte)0 if no such mapping exists.
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clear
public void clear()Empties the map. -
remove
public byte remove(byte key) Deletes a key/value pair from the map.- Parameters:
key
- anbyte
value- Returns:
- an
byte
value, or (byte)0 if no mapping for key exists
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equals
Compares this map with another map for equality of their stored entries. -
hashCode
public int hashCode() -
removeAt
protected void removeAt(int index) removes the mapping at index from the map. -
getValues
public byte[] getValues()Returns the values of the map.- Returns:
- a
Collection
value
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keys
public byte[] keys()returns the keys of the map.- Returns:
- a
Set
value
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keys
public byte[] keys(byte[] a) returns the keys of the map.- Parameters:
a
- the array into which the elements of the list are to be stored, if it is big enough; otherwise, a new array of the same type is allocated for this purpose.- Returns:
- a
Set
value
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containsValue
public boolean containsValue(byte val) checks for the presence of val in the values of the map.- Parameters:
val
- anbyte
value- Returns:
- a
boolean
value
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containsKey
public boolean containsKey(byte key) checks for the present of key in the keys of the map.- Parameters:
key
- anbyte
value- Returns:
- a
boolean
value
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forEachKey
Executes procedure for each key in the map.- Parameters:
procedure
- aTByteProcedure
value- Returns:
- false if the loop over the keys terminated because the procedure returned false for some key.
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forEachValue
Executes procedure for each value in the map.- Parameters:
procedure
- aTByteProcedure
value- Returns:
- false if the loop over the values terminated because the procedure returned false for some value.
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forEachEntry
Executes procedure for each key/value entry in the map.- Parameters:
procedure
- aTOByteByteProcedure
value- Returns:
- false if the loop over the entries terminated because the procedure returned false for some entry.
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retainEntries
Retains only those entries in the map for which the procedure returns a true value.- Parameters:
procedure
- determines which entries to keep- Returns:
- true if the map was modified.
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transformValues
Transform the values in this map using function.- Parameters:
function
- aTByteFunction
value
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increment
public boolean increment(byte key) Increments the primitive value mapped to key by 1- Parameters:
key
- the key of the value to increment- Returns:
- true if a mapping was found and modified.
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adjustValue
public boolean adjustValue(byte key, byte amount) Adjusts the primitive value mapped to key.- Parameters:
key
- the key of the value to incrementamount
- the amount to adjust the value by.- Returns:
- true if a mapping was found and modified.
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adjustOrPutValue
public byte adjustOrPutValue(byte key, byte adjust_amount, byte put_amount) Adjusts the primitive value mapped to the key if the key is present in the map. Otherwise, the initial_value is put in the map.- Parameters:
key
- the key of the value to incrementadjust_amount
- the amount to adjust the value byput_amount
- the value put into the map if the key is not initial present- Returns:
- the value present in the map after the adjustment or put operation
- Since:
- 2.0b1
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writeExternal
- Specified by:
writeExternal
in interfaceExternalizable
- Overrides:
writeExternal
in classTHash
- Throws:
IOException
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readExternal
- Specified by:
readExternal
in interfaceExternalizable
- Overrides:
readExternal
in classTHash
- Throws:
IOException
ClassNotFoundException
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toString
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