gnu.trove.map.hash

Class TObjectShortHashMap<K>

java.lang.Object

gnu.trove.impl.hash.THash

gnu.trove.impl.hash.TObjectHash<K>

gnu.trove.map.hash.TObjectShortHashMap<K>

All Implemented Interfaces:

TObjectShortMap<K>, java.io.Externalizable, java.io.Serializable

public class TObjectShortHashMap<K>
extends TObjectHash<K>
implements TObjectShortMap<K>, java.io.Externalizable

An open addressed Map implementation for Object keys and short values. Created: Sun Nov 4 08:52:45 2001

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	TObjectShortHashMap.KeyView a view onto the keys of the map.

Field Summary

Fields

Modifier and Type	Field and Description
protected short[]	_values the values of the map
protected short	no_entry_value the value that represents null

Fields inherited from class gnu.trove.impl.hash.TObjectHash

_set, consumeFreeSlot, FREE, REMOVED

Fields inherited from class gnu.trove.impl.hash.THash

_autoCompactionFactor, _autoCompactRemovesRemaining, _autoCompactTemporaryDisable, _free, _loadFactor, _maxSize, _size, DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR

Constructor Summary

Constructors

Constructor and Description
TObjectShortHashMap() Creates a new TObjectShortHashMap instance with the default capacity and load factor.
TObjectShortHashMap(int initialCapacity) Creates a new TObjectShortHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
TObjectShortHashMap(int initialCapacity, float loadFactor) Creates a new TObjectShortHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
TObjectShortHashMap(int initialCapacity, float loadFactor, short noEntryValue) Creates a new TObjectShortHashMap instance with a prime value at or near the specified capacity and load factor.
TObjectShortHashMap(TObjectShortMap<? extends K> map) Creates a new TObjectShortHashMap that contains the entries in the map passed to it.

Method Summary

Modifier and Type	Method and Description
short	adjustOrPutValue(K key, short adjust_amount, short put_amount) Adds an amount to the primitive value mapped to the key if the key is present in the map.
boolean	adjustValue(K key, short amount) Adds an amount to the primitive value mapped to key.
void	clear() Empties the collection.
boolean	containsKey(java.lang.Object key) Checks for the present of key in the keys of the map.
boolean	containsValue(short val) Checks for the presence of val in the values of the map.
boolean	equals(java.lang.Object other) Compares this map with another map for equality of their stored entries.
boolean	forEachEntry(TObjectShortProcedure<? super K> procedure) Executes procedure for each key/value entry in the map.
boolean	forEachKey(TObjectProcedure<? super K> procedure) Executes procedure for each key in the map.
boolean	forEachValue(TShortProcedure procedure) Executes procedure for each value in the map.
short	get(java.lang.Object key) Retrieves the value for key.
short	getNoEntryValue() Returns the value that will be returned from TObjectShortMap.get(java.lang.Object) or TObjectShortMap.put(K, short) if no entry exists for a given key.
int	hashCode() Returns the hash code value for this map.
boolean	increment(K key) Increments the primitive value mapped to key by 1
TObjectShortIterator<K>	iterator() Returns a TObjectShortIterator with access to this map's keys and values.
java.lang.Object[]	keys() Returns a copy of the keys of the map as an array.
K[]	keys(K[] a) Returns a copy of the keys of the map as an array.
java.util.Set<K>	keySet() Returns a Set view of the keys contained in this map.
short	put(K key, short value) Inserts a key/value pair into the map.
void	putAll(java.util.Map<? extends K,? extends java.lang.Short> map) Copies all of the mappings from the specified map to this map (optional operation).
void	putAll(TObjectShortMap<? extends K> map) Put all the entries from the given map into this map.
short	putIfAbsent(K key, short value) Inserts a key/value pair into the map if the specified key is not already associated with a value.
void	readExternal(java.io.ObjectInput in)
protected void	rehash(int newCapacity) rehashes the map to the new capacity.
short	remove(java.lang.Object key) Deletes a key/value pair from the map.
protected void	removeAt(int index) Removes the mapping at index from the map.
boolean	retainEntries(TObjectShortProcedure<? super K> procedure) Retains only those entries in the map for which the procedure returns a true value.
int	setUp(int initialCapacity) initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
java.lang.String	toString()
void	transformValues(TShortFunction function) Transform the values in this map using function.
TShortCollection	valueCollection() Returns a TShortCollection view of the values contained in this map.
short[]	values() Returns the values of the map as an array of short values.
short[]	values(short[] array) Returns the values of the map using an existing array.
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class gnu.trove.impl.hash.TObjectHash

buildObjectContractViolation, capacity, contains, dumpExtraInfo, equals, forEach, hash, index, insertionIndex, insertKey, objectInfo, reportPotentialConcurrentMod, throwObjectContractViolation, throwObjectContractViolation

Methods inherited from class gnu.trove.impl.hash.THash

calculateGrownCapacity, compact, computeMaxSize, computeNextAutoCompactionAmount, ensureCapacity, fastCeil, getAutoCompactionFactor, isEmpty, postInsertHook, reenableAutoCompaction, saturatedCast, 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.TObjectShortMap

isEmpty, size

Field Detail

_values

protected transient short[] _values

the values of the map

no_entry_value

protected short no_entry_value

the value that represents null

Constructor Detail

TObjectShortHashMap

public TObjectShortHashMap()

Creates a new TObjectShortHashMap instance with the default capacity and load factor.

TObjectShortHashMap

public TObjectShortHashMap(int initialCapacity)

Creates a new TObjectShortHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.

Parameters:

initialCapacity - an int value

TObjectShortHashMap

public TObjectShortHashMap(int initialCapacity,
                           float loadFactor)

Creates a new TObjectShortHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.

Parameters:

initialCapacity - an int value

loadFactor - a float value

TObjectShortHashMap

public TObjectShortHashMap(int initialCapacity,
                           float loadFactor,
                           short noEntryValue)

Creates a new TObjectShortHashMap 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.

noEntryValue - the value used to represent null.

TObjectShortHashMap

public TObjectShortHashMap(TObjectShortMap<? extends K> map)

Creates a new TObjectShortHashMap that contains the entries in the map passed to it.

Parameters:

map - the TObjectShortMap to be copied.

Method Detail

setUp

public int setUp(int initialCapacity)

initializes the hashtable to a prime capacity which is at least initialCapacity + 1.

Overrides:

setUp in class TObjectHash<K>

Parameters:

initialCapacity - an int value

Returns:

the actual capacity chosen

rehash

protected void rehash(int newCapacity)

rehashes the map to the new capacity.

Specified by:

rehash in class THash

Parameters:

newCapacity - an int value

getNoEntryValue

public short getNoEntryValue()

Returns the value that will be returned from TObjectShortMap.get(java.lang.Object) or TObjectShortMap.put(K, short) if no entry exists for a given key. The default value is generally zero, but can be configured during construction of the collection.

Specified by:

getNoEntryValue in interface TObjectShortMap<K>

Returns:

the value that represents a null value in this collection.

containsKey

public boolean containsKey(java.lang.Object key)

Checks for the present of key in the keys of the map.

Specified by:

containsKey in interface TObjectShortMap<K>

containsValue

public boolean containsValue(short val)

Checks for the presence of val in the values of the map.

Specified by:

containsValue in interface TObjectShortMap<K>

get

public short get(java.lang.Object key)

Retrieves the value for key.

Specified by:

get in interface TObjectShortMap<K>

Returns:

the previous value associated with key, or the "no entry" value if none was found (see TObjectShortMap.getNoEntryValue()).

put

public short put(K key,
                 short value)

Inserts a key/value pair into the map.

Specified by:

put in interface TObjectShortMap<K>

Returns:

the previous value associated with key, or the "no entry" value if none was found (see TObjectShortMap.getNoEntryValue()).

putIfAbsent

public short putIfAbsent(K key,
                         short value)

Inserts a key/value pair into the map if the specified key is not already associated with a value.

Specified by:

putIfAbsent in interface TObjectShortMap<K>

Parameters:

key - key with which the specified value is to be associated

value - an short value to be associated with the specified key

Returns:

the previous value associated with key, or the "no entry" value if none was found (see TObjectShortMap.getNoEntryValue()).

remove

public short remove(java.lang.Object key)

Deletes a key/value pair from the map.

Specified by:

remove in interface TObjectShortMap<K>

Parameters:

key - an #k# value

Returns:

the previous value associated with key, or the "no entry" value if none was found (see TObjectShortMap.getNoEntryValue()).

removeAt

protected void removeAt(int index)

Removes the mapping at index from the map. This method is used internally and public mainly because of packaging reasons. Caveat Programmer.

Overrides:

removeAt in class TObjectHash<K>

Parameters:

index - an int value

putAll

public void putAll(java.util.Map<? extends K,? extends java.lang.Short> map)

Copies all of the mappings from the specified map to this map (optional operation). The effect of this call is equivalent to that of calling put(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 interface TObjectShortMap<K>

Parameters:

map - mappings to be stored in this map

putAll

public void putAll(TObjectShortMap<? extends K> map)

Put all the entries from the given map into this map.

Specified by:

putAll in interface TObjectShortMap<K>

Parameters:

map - The map from which entries will be obtained to put into this map.

clear

public void clear()

Empties the collection.

Specified by:

clear in interface TObjectShortMap<K>

Overrides:

clear in class THash

keySet

public java.util.Set<K> keySet()

Returns a Set 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 interface TObjectShortMap<K>

Returns:

a set view of the keys contained in this map

keys

public java.lang.Object[] 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 interface TObjectShortMap<K>

Returns:

a copy of the keys of the map as an array.

keys

public K[] keys(K[] a)

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 interface TObjectShortMap<K>

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:

the keys of the map as an array.

valueCollection

public TShortCollection valueCollection()

Returns a TShortCollection 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 TShortIterator.remove, TShortCollection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:

valueCollection in interface TObjectShortMap<K>

Returns:

a collection view of the values contained in this map

values

public short[] values()

Returns the values of the map as an array of short values. Changes to the array of values will not be reflected in the map nor vice-versa.

Specified by:

values in interface TObjectShortMap<K>

Returns:

the values of the map as an array of short values.

values

public short[] values(short[] array)

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 interface TObjectShortMap<K>

Parameters:

array - 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 short values.

iterator

public TObjectShortIterator<K> iterator()

Description copied from interface: TObjectShortMap

Returns a TObjectShortIterator with access to this map's keys and values.

Specified by:

iterator in interface TObjectShortMap<K>

Returns:

an iterator over the entries in this map

increment

public boolean increment(K key)

Increments the primitive value mapped to key by 1

Specified by:

increment in interface TObjectShortMap<K>

Parameters:

key - the key of the value to increment

Returns:

true if a mapping was found and modified.

adjustValue

public boolean adjustValue(K key,
                           short amount)

Adds an amount to the primitive value mapped to key. If the key does not exist, the map is not modified (key-value is not inserted).

Specified by:

adjustValue in interface TObjectShortMap<K>

Parameters:

key - the key of the value to increment

amount - the amount to add to the value; may be positive, zero, or negative

Returns:

true if a mapping was found and modified

See Also:

TObjectShortMap.adjustOrPutValue(Object, short, short)

adjustOrPutValue

public short adjustOrPutValue(K key,
                              short adjust_amount,
                              short put_amount)

Adds an amount to the primitive value mapped to the key if the key is present in the map. Otherwise, the put_amount is put in the map.

Specified by:

adjustOrPutValue in interface TObjectShortMap<K>

Parameters:

key - the key of the value to increment

adjust_amount - the amount to add to the value; may be positive, zero, or negative

put_amount - the value put into the map if the key is not present

Returns:

the value present in the map after the adjustment or put operation

forEachKey

public boolean forEachKey(TObjectProcedure<? super K> procedure)

Executes procedure for each key in the map.

Specified by:

forEachKey in interface TObjectShortMap<K>

Parameters:

procedure - a TObjectProcedure value

Returns:

false if the loop over the keys terminated because the procedure returned false for some key.

forEachValue

public boolean forEachValue(TShortProcedure procedure)

Executes procedure for each value in the map.

Specified by:

forEachValue in interface TObjectShortMap<K>

Parameters:

procedure - a TShortProcedure value

Returns:

false if the loop over the values terminated because the procedure returned false for some value.

forEachEntry

public boolean forEachEntry(TObjectShortProcedure<? super K> procedure)

Executes procedure for each key/value entry in the map.

Specified by:

forEachEntry in interface TObjectShortMap<K>

Parameters:

procedure - a TOObjectShortProcedure value

Returns:

false if the loop over the entries terminated because the procedure returned false for some entry.

retainEntries

public boolean retainEntries(TObjectShortProcedure<? super K> procedure)

Retains only those entries in the map for which the procedure returns a true value.

Specified by:

retainEntries in interface TObjectShortMap<K>

Parameters:

procedure - determines which entries to keep

Returns:

true if the map was modified.

transformValues

public void transformValues(TShortFunction function)

Transform the values in this map using function.

Specified by:

transformValues in interface TObjectShortMap<K>

Parameters:

function - a TShortFunction value

equals

public boolean equals(java.lang.Object other)

Compares this map with another map for equality of their stored entries.

Specified by:

equals in interface TObjectShortMap<K>

Overrides:

equals in class java.lang.Object

Parameters:

other - an Object value

Returns:

a boolean value

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 of Object.hashCode().

Specified by:

hashCode in interface TObjectShortMap<K>

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code value for this map

See Also:

Object.equals(Object), TObjectShortMap.equals(Object)

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class TObjectHash<K>

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Overrides:

readExternal in class TObjectHash<K>

Throws:

java.io.IOException

java.lang.ClassNotFoundException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object