Class TByteObjectHashMap<V>
- All Implemented Interfaces:
TByteObjectMap<V>
,Externalizable
,Serializable
- See Also:
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected class
a view onto the values of the map. -
Field Summary
FieldsModifier and TypeFieldDescriptionprotected V[]
the values of the mapprotected byte
the value that represents null in the key set.Fields inherited from class gnu.trove.impl.hash.TByteHash
_set, consumeFreeSlot, no_entry_value
Fields inherited from class gnu.trove.impl.hash.TPrimitiveHash
_states, FREE, FULL, REMOVED
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
ConstructorsConstructorDescriptionCreates a newTByteObjectHashMap
instance with the default capacity and load factor.TByteObjectHashMap
(int initialCapacity) Creates a newTByteObjectHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.TByteObjectHashMap
(int initialCapacity, float loadFactor) Creates a newTByteObjectHashMap
instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.TByteObjectHashMap
(int initialCapacity, float loadFactor, byte noEntryKey) Creates a newTByteObjectHashMap
instance with a prime value at or near the specified capacity and load factor.TByteObjectHashMap
(TByteObjectMap<? extends V> map) Creates a newTByteObjectHashMap
that contains the entries in the map passed to it. -
Method Summary
Modifier and TypeMethodDescriptionvoid
clear()
Empties the collection.boolean
containsKey
(byte key) Returns true if this map contains a mapping for the specified key.boolean
containsValue
(Object val) Returns true if this map maps one or more keys to the specified value.boolean
Compares the specified object with this map for equality.boolean
forEachEntry
(TByteObjectProcedure<? super V> 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
(TObjectProcedure<? super V> procedure) Executes procedure for each value in the map.get
(byte key) Returns the value to which the specified key is mapped, ornull
if this map contains no mapping for the key.byte
Returns the value that represents null in theTByteObjectMap.keySet()
.int
hashCode()
Returns the hash code value for this map.iterator()
Returns a TByteObjectIterator with access to this map's keys and values.byte[]
keys()
Returns a copy of the keys of the map as an array.byte[]
keys
(byte[] dest) Returns a copy of the keys of the map as an array.keySet()
Returns aTByteSet
view of the keys contained in this map.Associates the specified value with the specified key in this map (optional operation).void
putAll
(TByteObjectMap<? extends V> map) Put all the entries from the given map into this map.void
Copies all of the mappings from the specified map to this map (optional operation).putIfAbsent
(byte key, V 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 set.remove
(byte key) Removes the mapping for a key from this map if it is present (optional operation).protected void
removeAt
(int index) Releases the element currently stored at index.boolean
retainEntries
(TByteObjectProcedure<? super V> 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
(TObjectFunction<V, V> function) Transform the values in this map using function.Returns aCollection
view of the values contained in this map.Object[]
values()
Returns the values of the map as an Object array.V[]
Returns the values of the map using an existing array.void
Methods inherited from class gnu.trove.impl.hash.TByteHash
contains, forEach, getNoEntryValue, index, insertKey
Methods inherited from class gnu.trove.impl.hash.TPrimitiveHash
capacity
Methods inherited from class gnu.trove.impl.hash.THash
calculateGrownCapacity, compact, computeMaxSize, computeNextAutoCompactionAmount, ensureCapacity, getAutoCompactionFactor, isEmpty, postInsertHook, reenableAutoCompaction, setAutoCompactionFactor, size, tempDisableAutoCompaction, trimToSize
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
Methods inherited from interface gnu.trove.map.TByteObjectMap
isEmpty, size
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Field Details
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_values
the values of the map -
no_entry_key
protected byte no_entry_keythe value that represents null in the key set.
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Constructor Details
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TByteObjectHashMap
public TByteObjectHashMap()Creates a newTByteObjectHashMap
instance with the default capacity and load factor. -
TByteObjectHashMap
public TByteObjectHashMap(int initialCapacity) Creates a newTByteObjectHashMap
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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TByteObjectHashMap
public TByteObjectHashMap(int initialCapacity, float loadFactor) Creates a newTByteObjectHashMap
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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TByteObjectHashMap
public TByteObjectHashMap(int initialCapacity, float loadFactor, byte noEntryKey) Creates a newTByteObjectHashMap
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.noEntryKey
- the value used to represent null in the key set.
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TByteObjectHashMap
Creates a newTByteObjectHashMap
that contains the entries in the map passed to it.- Parameters:
map
- the TByteObjectMap to be copied.
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Method Details
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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 classgnu.trove.impl.hash.TByteHash
- Parameters:
initialCapacity
- anint
value- Returns:
- the actual capacity chosen
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rehash
protected void rehash(int newCapacity) Rehashes the set.- Specified by:
rehash
in classgnu.trove.impl.hash.THash
- Parameters:
newCapacity
- anint
value
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getNoEntryKey
public byte getNoEntryKey()Returns the value that represents null in theTByteObjectMap.keySet()
. The default value is generally zero, but can be changed during construction of the collection.- Specified by:
getNoEntryKey
in interfaceTByteObjectMap<V>
- Returns:
- the value that represents a null value in this collection.
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containsKey
public boolean containsKey(byte key) Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that key.equals(k). (There can be at most one such mapping.)- Specified by:
containsKey
in interfaceTByteObjectMap<V>
- Parameters:
key
- key whose presence in this map is to be tested- Returns:
- true if this map contains a mapping for the specified key
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containsValue
Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.- Specified by:
containsValue
in interfaceTByteObjectMap<V>
- Parameters:
val
- value whose presence in this map is to be tested- Returns:
- true if this map maps one or more keys to the specified value
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get
Returns the value to which the specified key is mapped, ornull
if this map contains no mapping for the key.More formally, if this map contains a mapping from a key
k
to a valuev
such that(key==null ? k==null : key.equals(k))
, then this method returnsv
; otherwise it returnsnull
. (There can be at most one such mapping.)If this map permits null values, then a return value of
null
does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key tonull
. ThecontainsKey
operation may be used to distinguish these two cases.- Specified by:
get
in interfaceTByteObjectMap<V>
- Parameters:
key
- the key whose associated value is to be returned- Returns:
- the byte value to which the specified key is mapped, or
null
if this map contains no mapping for the key
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put
Associates the specified value with the specified key in this map (optional operation). If the map previously contained a mapping for the key, the old value is replaced by the specified value. (A map m is said to contain a mapping for a key k if and only ifm.containsKey(k)
would return true.)- Specified by:
put
in interfaceTByteObjectMap<V>
- Parameters:
key
- key with which the specified value is to be associatedvalue
- an byte value value to be associated with the specified key- Returns:
- the previous value associated with key, or no_entry_value if there was no mapping for key. (A no_entry_value return can also indicate that the map previously associated null with key, if the implementation supports null values.)
- See Also:
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putIfAbsent
Inserts a key/value pair into the map if the specified key is not already associated with a value.- Specified by:
putIfAbsent
in interfaceTByteObjectMap<V>
- Parameters:
key
- key with which the specified value is to be associatedvalue
- an byte value to be associated with the specified key- Returns:
- the previous value associated with key, or null if none was found.
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remove
Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such thatkey.equals(k)
, that mapping is removed. (The map can contain at most one such mapping.)Returns the value to which this map previously associated the key, or null if the map contained no mapping for the key.
If this map permits null values, then a return value of null does not necessarily indicate that the map contained no mapping for the key; it's also possible that the map explicitly mapped the key to null.
The map will not contain a mapping for the specified key once the call returns.
- Specified by:
remove
in interfaceTByteObjectMap<V>
- Parameters:
key
- key whose mapping is to be removed from the map- Returns:
- the previous byte value associated with key, or null if there was no mapping for key.
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removeAt
protected void removeAt(int index) Releases the element currently stored at index.- Overrides:
removeAt
in classgnu.trove.impl.hash.TByteHash
- Parameters:
index
- anint
value
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putAll
Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of callingput(k, v)
on this map once for each mapping from key k to value v in the specified map. The behavior of this operation is undefined if the specified map is modified while the operation is in progress.- Specified by:
putAll
in interfaceTByteObjectMap<V>
- Parameters:
map
- mappings to be stored in this map
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putAll
Put all the entries from the given map into this map.- Specified by:
putAll
in interfaceTByteObjectMap<V>
- Parameters:
map
- The map from which entries will be obtained to put into this map.
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clear
public void clear()Empties the collection.- Specified by:
clear
in interfaceTByteObjectMap<V>
- Overrides:
clear
in classgnu.trove.impl.hash.THash
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keySet
Returns aTByteSet
view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.- Specified by:
keySet
in interfaceTByteObjectMap<V>
- Returns:
- a set view of the keys contained in this map
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keys
public byte[] keys()Returns a copy of the keys of the map as an array. Changes to the array of keys will not be reflected in the map nor vice-versa.- Specified by:
keys
in interfaceTByteObjectMap<V>
- Returns:
- a copy of the keys of the map as an array.
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keys
public byte[] keys(byte[] dest) Returns a copy of the keys of the map as an array. Changes to the array of keys will not be reflected in the map nor vice-versa.- Specified by:
keys
in interfaceTByteObjectMap<V>
- Parameters:
dest
- 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:
- the keys of the map as an array.
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valueCollection
Returns aCollection
view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.- Specified by:
valueCollection
in interfaceTByteObjectMap<V>
- Returns:
- a collection view of the values contained in this map
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values
Returns the values of the map as an Object array. Note that the array returned is typed as an Object[] and may not be cast to a more specific type. SeeTByteObjectMap.values(V[])
for a version which allows specifically typed arrays. Changes to the array of values will not be reflected in the map nor vice-versa.- Specified by:
values
in interfaceTByteObjectMap<V>
- Returns:
- the values of the map as an array of byte values.
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values
Returns the values of the map using an existing array. Changes to the array of values will not be reflected in the map nor vice-versa.- Specified by:
values
in interfaceTByteObjectMap<V>
- Parameters:
dest
- 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:
- the values of the map as an array of byte values.
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iterator
Returns a TByteObjectIterator with access to this map's keys and values.- Specified by:
iterator
in interfaceTByteObjectMap<V>
- Returns:
- a TByteObjectIterator with access to this map's keys and values.
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forEachKey
Executes procedure for each key in the map.- Specified by:
forEachKey
in interfaceTByteObjectMap<V>
- Parameters:
procedure
- aTObjectProcedure
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.- Specified by:
forEachValue
in interfaceTByteObjectMap<V>
- Parameters:
procedure
- aTObjectProcedure
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.- Specified by:
forEachEntry
in interfaceTByteObjectMap<V>
- Parameters:
procedure
- aTByteObjectProcedure
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.- Specified by:
retainEntries
in interfaceTByteObjectMap<V>
- 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.- Specified by:
transformValues
in interfaceTByteObjectMap<V>
- Parameters:
function
- aTObjectFunction
value
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equals
Compares the specified object with this map for equality. Returns true if the given object is also a map and the two maps represent the same mappings. More formally, two maps m1 and m2 represent the same mappings if m1.entrySet().equals(m2.entrySet()). This ensures that the equals method works properly across different implementations of the Map interface.- Specified by:
equals
in interfaceTByteObjectMap<V>
- Overrides:
equals
in classObject
- Parameters:
other
- object to be compared for equality with this map- Returns:
- true if the specified object is equal to this map
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hashCode
public int hashCode()Returns the hash code value for this map. The hash code of a map is defined to be the sum of the hash codes of each entry in the map's entrySet() view. This ensures that m1.equals(m2) implies that m1.hashCode()==m2.hashCode() for any two maps m1 and m2, as required by the general contract ofObject.hashCode()
.- Specified by:
hashCode
in interfaceTByteObjectMap<V>
- Overrides:
hashCode
in classObject
- Returns:
- the hash code value for this map
- See Also:
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writeExternal
- Specified by:
writeExternal
in interfaceExternalizable
- Overrides:
writeExternal
in classgnu.trove.impl.hash.THash
- Throws:
IOException
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readExternal
- Specified by:
readExternal
in interfaceExternalizable
- Overrides:
readExternal
in classgnu.trove.impl.hash.THash
- Throws:
IOException
ClassNotFoundException
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toString
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