gnu.trove

Class TByteObjectHashMap<V>

Implemented Interfaces:
Externalizable

public class TByteObjectHashMap<V>
extends TByteHash
implements Externalizable

An open addressed Map implementation for byte keys and Object values. Created: Sun Nov 4 08:52:45 2001
Author:
Eric D. Friedman

Field Summary

protected V[]
_values
the values of the map

Constructor Summary

TByteObjectHashMap()
Creates a new TByteObjectHashMap instance with the default capacity and load factor.
TByteObjectHashMap(TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap instance with the default capacity and load factor.
TByteObjectHashMap(int initialCapacity)
Creates a new TByteObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
TByteObjectHashMap(int initialCapacity, TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
TByteObjectHashMap(int initialCapacity, float loadFactor)
Creates a new TByteObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the specified load factor.
TByteObjectHashMap(int initialCapacity, float loadFactor, TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap instance with a prime value at or near the specified capacity and load factor.

Method Summary

T[] getValues(T[] a)
Return the values of the map; the runtime type of the returned array is that of the specified array.
void
clear()
Empties the map.
TByteObjectHashMap
clone()
boolean
containsKey(byte key)
checks for the present of key in the keys of the map.
boolean
containsValue(V val)
checks for the presence of val in the values of the map.
boolean
equals(Object other)
Compares this map with another map for equality of their stored entries.
boolean
forEachEntry(TByteObjectProcedure 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 procedure)
Executes procedure for each value in the map.
V
get(byte key)
retrieves the value for key
Object[]
getValues()
Returns the values of the map.
int
hashCode()
TByteObjectIterator
iterator()
byte[]
keys()
returns the keys of the map.
V
put(byte key, V value)
Inserts a key/value pair into the map.
void
readExternal(ObjectInput in)
protected void
rehash(int newCapacity)
rehashes the map to the new capacity.
V
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(TByteObjectProcedure 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.
void
transformValues(TObjectFunction function)
Transform the values in this map using function.
void
writeExternal(ObjectOutput out)

Field Details

_values

protected V[] _values
the values of the map

Constructor Details

TByteObjectHashMap

public TByteObjectHashMap()
Creates a new TByteObjectHashMap instance with the default capacity and load factor.

TByteObjectHashMap

public TByteObjectHashMap(TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap instance with the default capacity and load factor.
Parameters:
strategy - used to compute hash codes and to compare keys.

TByteObjectHashMap

public TByteObjectHashMap(int initialCapacity)
Creates a new TByteObjectHashMap instance with a prime capacity equal to or greater than initialCapacity and with the default load factor.
Parameters:
initialCapacity - an int value

TByteObjectHashMap

public TByteObjectHashMap(int initialCapacity,
                          TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap instance whose capacity is the next highest prime above initialCapacity + 1 unless that value is already prime.
Parameters:
initialCapacity - an int value
strategy - used to compute hash codes and to compare keys.

TByteObjectHashMap

public TByteObjectHashMap(int initialCapacity,
                          float loadFactor)
Creates a new TByteObjectHashMap 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

TByteObjectHashMap

public TByteObjectHashMap(int initialCapacity,
                          float loadFactor,
                          TByteHashingStrategy strategy)
Creates a new TByteObjectHashMap 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.

Method Details

T[] getValues

public  T[] getValues(T[] a)
Return the values of the map; the runtime type of the returned array is that of the specified array.
Parameters:
a - the array into which the elements of this collection are to be stored, if it is big enough; otherwise, a new array of the same runtime type is allocated for this purpose.
Returns:
an array containing the elements of this collection

clear

public void clear()
Empties the map.

clone

public TByteObjectHashMap clone()
Returns:
a deep clone of this collection

containsKey

public boolean containsKey(byte key)
checks for the present of key in the keys of the map.
Parameters:
key - an byte value
Returns:
a boolean value

containsValue

public boolean containsValue(V val)
checks for the presence of val in the values of the map.
Parameters:
val - an Object value
Returns:
a boolean value

equals

public boolean equals(Object other)
Compares this map with another map for equality of their stored entries.
Parameters:
other - an Object value
Returns:
a boolean value

forEachEntry

public boolean forEachEntry(TByteObjectProcedure procedure)
Executes procedure for each key/value entry in the map.
Parameters:
procedure - a TOByteObjectProcedure value
Returns:
false if the loop over the entries terminated because the procedure returned false for some entry.

forEachKey

public boolean forEachKey(TByteProcedure procedure)
Executes procedure for each key in the map.
Parameters:
procedure - a TByteProcedure value
Returns:
false if the loop over the keys terminated because the procedure returned false for some key.

forEachValue

public boolean forEachValue(TObjectProcedure procedure)
Executes procedure for each value in the map.
Parameters:
procedure - a TObjectProcedure value
Returns:
false if the loop over the values terminated because the procedure returned false for some value.

get

public V get(byte key)
retrieves the value for key
Parameters:
key - an byte value
Returns:
the value of key or (byte)0 if no such mapping exists.

getValues

public Object[] getValues()
Returns the values of the map.
Returns:
a Collection value
See Also:
getValues(Object[])

hashCode

public int hashCode()

iterator

public TByteObjectIterator iterator()
Returns:
a TByteObjectIterator with access to this map's keys and values

keys

public byte[] keys()
returns the keys of the map.
Returns:
a Set value

put

public V put(byte key,
             V value)
Inserts a key/value pair into the map.
Parameters:
key - an byte value
value - an Object value
Returns:
the previous value associated with key, or (byte)0 if none was found.

readExternal

public void readExternal(ObjectInput in)
            throws IOException,
                   ClassNotFoundException

rehash

protected void rehash(int newCapacity)
rehashes the map to the new capacity.
Parameters:
newCapacity - an int value

remove

public V remove(byte key)
Deletes a key/value pair from the map.
Parameters:
key - an byte value
Returns:
an Object value or (byte)0 if no such mapping exists.

removeAt

protected void removeAt(int index)
removes the mapping at index from the map.
Parameters:
index - an int value

retainEntries

public boolean retainEntries(TByteObjectProcedure procedure)
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.

setUp

protected int setUp(int initialCapacity)
initializes the hashtable to a prime capacity which is at least initialCapacity + 1.
Parameters:
initialCapacity - an int value
Returns:
the actual capacity chosen

transformValues

public void transformValues(TObjectFunction function)
Transform the values in this map using function.
Parameters:
function - a TObjectFunction value

writeExternal

public void writeExternal(ObjectOutput out)
            throws IOException

GNU Trove is copyright B) 2001-2008 Eric D. Friedman. All Rights Reserved.