cern.colt.map
Class AbstractMap

java.lang.Object
  cern.colt.PersistentObject
      cern.colt.map.AbstractMap

All Implemented Interfaces:

Serializable, Cloneable

Direct Known Subclasses:

AbstractDoubleIntMap, AbstractDoubleLongMap, AbstractFloatIntMap, AbstractFloatLongMap, AbstractIntDoubleMap, AbstractIntFloatMap, AbstractIntIntMap, AbstractIntLongMap, AbstractIntObjectMap, AbstractLongDoubleMap, AbstractLongFloatMap, AbstractLongIntMap, AbstractLongLongMap, AbstractLongObjectMap

public abstract class AbstractMap
extends PersistentObject

Abstract base class for hash maps holding objects or primitive data types such as int, float, etc. as keys and/or values. First see the package summary and javadoc tree view to get the broad picture.

Note that implementations are not synchronized.

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

See Also:

HashMap, Serialized Form

Method Summary

abstract void	clear() Removes all (key,value) associations from the receiver.
void	ensureCapacity(int minCapacity) Ensures that the receiver can hold at least the specified number of elements without needing to allocate new internal memory.
boolean	isEmpty() Returns true if the receiver contains no (key,value) associations.
int	size() Returns the number of (key,value) associations currently contained.
void	trimToSize() Trims the capacity of the receiver to be the receiver's current size.

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

clear

public abstract void clear()

Removes all (key,value) associations from the receiver.

ensureCapacity

public void ensureCapacity(int minCapacity)

Ensures that the receiver can hold at least the specified number of elements without needing to allocate new internal memory. If necessary, allocates new internal memory and increases the capacity of the receiver.

This method never need be called; it is for performance tuning only. Calling this method before put()ing a large number of associations boosts performance, because the receiver will grow only once instead of potentially many times.

This default implementation does nothing. Override this method if necessary.

Parameters:

minCapacity - the desired minimum capacity.

isEmpty

public boolean isEmpty()

Returns true if the receiver contains no (key,value) associations.

Returns:

true if the receiver contains no (key,value) associations.

size

public int size()

Returns the number of (key,value) associations currently contained.

Returns:

the number of (key,value) associations currently contained.

trimToSize

public void trimToSize()

Trims the capacity of the receiver to be the receiver's current size. Releases any superfluous internal memory. An application can use this operation to minimize the storage of the receiver.

This default implementation does nothing. Override this method if necessary.