org.jscience.computing.ai.expertsystem.conflict
Class AbstractConflictSet

java.lang.Object
  org.jscience.computing.ai.expertsystem.conflict.AbstractConflictSet

All Implemented Interfaces:

ConflictSet

Direct Known Subclasses:

DefaultConflictSet, LRUConflictSet, MRUConflictSet, OneShotConflictSet, PriorityConflictSet

public abstract class AbstractConflictSet
extends java.lang.Object
implements ConflictSet

This class provides a skeletal implementation of the ConflictSet interface to minimize the effort required to implement this interface. It helps mainly in dealing with the registered listeners for conflict set events. Its subclasses must invoke the methods elementAdded and elementRemoved wheneved applicable to make full use of the notification mechanism this skeleton provides.

Field Summary

protected boolean	debug Flag indicating whether there is some registered listener.
protected java.util.Vector	listeners The event listeners.

Constructor Summary

AbstractConflictSet()
Class constructor.

Method Summary

void	addInternalConflictSetListener(InternalConflictSetListener l) Adds the specified listener to receive events from this conflict set.
protected void	elementAdded(ConflictSetElement e) Callback method, used to indicate that an element has been added to this conflict set.
protected void	elementRemoved(ConflictSetElement e) Callback method, used to indicate that an element has been removed from this conflict set.
protected void	removeElementsWith_1D(java.util.Vector fireableRules, java.lang.Object obj) Auxiliar method, used to remove the elements that use a given object in its instantiations.
protected int	removeElementsWith_2D(java.util.Vector fireableRules, java.lang.Object obj) Auxiliar method, used to remove the elements that use a given object in its instantiations.
void	removeInternalConflictSetListener(InternalConflictSetListener l) Removes the specified listener so that it no longer receives events from this conflict set.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.jscience.computing.ai.expertsystem.conflict.ConflictSet

flush, insertElement, isEmpty, nextElement, removeElementsWith

Field Detail

listeners

protected java.util.Vector listeners

The event listeners.

debug

protected boolean debug

Flag indicating whether there is some registered listener.

Constructor Detail

AbstractConflictSet

public AbstractConflictSet()

Class constructor.

Method Detail

addInternalConflictSetListener

public void addInternalConflictSetListener(InternalConflictSetListener l)

Adds the specified listener to receive events from this conflict set.

Specified by:

addInternalConflictSetListener in interface ConflictSet

Parameters:

l - the conflict set listener

elementAdded

protected void elementAdded(ConflictSetElement e)

Callback method, used to indicate that an element has been added to this conflict set.

Parameters:

e - the element that has been added to this conflict set.

elementRemoved

protected void elementRemoved(ConflictSetElement e)

Callback method, used to indicate that an element has been removed from this conflict set. Elements that are returned by the nextElement are not considered as been removed.

Parameters:

e - the element that has been removed from this conflict set.

removeElementsWith_1D

protected void removeElementsWith_1D(java.util.Vector fireableRules,
                                     java.lang.Object obj)

Auxiliar method, used to remove the elements that use a given object in its instantiations. This method should be used when the fireable rules are stored in a linear (unidimensional) Vector.

Parameters:

fireableRules - the Vector that stores the fireable rules.

obj - the given object.

removeElementsWith_2D

protected int removeElementsWith_2D(java.util.Vector fireableRules,
                                    java.lang.Object obj)

Auxiliar method, used to remove the elements that use a given object in its instantiations. This method should be used when the fireable rules are stored in a matricial (bidimensional) Vector.

Parameters:

fireableRules - the Vector that stores the fireable rules.

obj - the given object.

Returns:

the number of elements that have been removed.

removeInternalConflictSetListener

public void removeInternalConflictSetListener(InternalConflictSetListener l)

Removes the specified listener so that it no longer receives events from this conflict set.

Specified by:

removeInternalConflictSetListener in interface ConflictSet

Parameters:

l - the conflict set listener