jeops.rete
Class JoinReteNode

java.lang.Object
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  +--jeops.rete.ReteNode
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        +--jeops.rete.JoinReteNode

public class JoinReteNode

extends ReteNode

A node in the Rete network that has more than one input, so that objects coming from distinct parts of the network are joined together in instances of this class.

Version:

1.0 14 Jul 2000

Author:

Carlos Figueira Filho (csff@cin.ufpe.br)

Field Summary

private java.lang.Object[]	ARRAY Object array, defined as an attribute for efficiency purposes only.
private int	declIndex
private java.util.Iterator[]	its Iterator array, defined as an attribute for efficiency purposes only.
private AbstractRuleBase	ruleBase The rule base used to check the validity of the property of the incoming objects.
private int	ruleIndex The index of the rule that contains the condition to be checked by this node.
private java.util.List[]	waitingObjects The objects that are "waiting" at some inputs of this node for the arrival of objects in other inputs, in order to be propagated at this node.

Fields inherited from class jeops.rete.ReteNode

numberInputs, numberOutputs, successors

Constructor Summary

JoinReteNode(int numberInputs, AbstractRuleBase ruleBase, int ruleIndex, int declIndex)
Class constructor.

Method Summary

void	flush() Remove all objects that may be stored in this node.
void	newObject(java.lang.Object obj, int input) Informs this node that an object has arrived.
void	remove(java.lang.Object obj) Remove the given object from the memory of this node.
java.lang.String	toString() Returns a string representation of this object.

Methods inherited from class jeops.rete.ReteNode

addSuccessor, addSuccessor, addSuccessor, getNumberInputs, getNumberOutputs, getSuccessors, propagate

Methods inherited from class java.lang.Object

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

Field Detail

waitingObjects

private java.util.List[] waitingObjects

The objects that are "waiting" at some inputs of this node for the arrival of objects in other inputs, in order to be propagated at this node. It's actually a list of lists, where for every input of this node there is a list of the objects entered by that input.

ruleBase

private AbstractRuleBase ruleBase

The rule base used to check the validity of the property of the incoming objects.

ruleIndex

private int ruleIndex

The index of the rule that contains the condition to be checked by this node.

declIndex

private int declIndex

ARRAY

private final java.lang.Object[] ARRAY

Object array, defined as an attribute for efficiency purposes only.

its

private final java.util.Iterator[] its

Iterator array, defined as an attribute for efficiency purposes only.

Constructor Detail

JoinReteNode

public JoinReteNode(int numberInputs,
                    AbstractRuleBase ruleBase,
                    int ruleIndex,
                    int declIndex)

Class constructor.

Parameters:

numberInputs - the number of inputs of this node.

ruleBase - the rule base used to check if this node can be activated.

ruleIndex - the index of the rule that contains the condition to be checked by this node.

declIndex - the index of the declaration being joined by this node.

Method Detail

flush

public void flush()

Remove all objects that may be stored in this node.

newObject

public void newObject(java.lang.Object obj,
                      int input)

Informs this node that an object has arrived.

Overrides:

newObject in class ReteNode

Parameters:

obj - the object that arrived at this node.

input - the input number of this node that is to receive the object.

remove

public void remove(java.lang.Object obj)

Remove the given object from the memory of this node.

Parameters:

obj - the object to be removed.

toString

public java.lang.String toString()

Returns a string representation of this object. Useful for debugging.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this object.