jeops.rete
Class ReteNode

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

Direct Known Subclasses:

ClassFilterReteNode, FilterReteNode, FinalReteNode, JoinReteNode

public abstract class ReteNode

extends java.lang.Object

A node in the Rete network. This class is the base for all kinds of nodes that exist in the implementation of the Rete network for JEOPS.

Version:

1.0 13 Jul 2000

Author:

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

Field Summary

private int	numberInputs The number of inputs of this node.
private int	numberOutputs The number of outputs of this node.
private java.util.List	successors The nodes that succede this one.

Constructor Summary

ReteNode(int numberInputs, int numberOutputs)
Creates a new rete node.

Method Summary

void	addSuccessor(int input, ReteNode succNode, int succInput) Adds a connection from some input of this node to a given input of the given node.
void	addSuccessor(ReteNode succNode) Adds a connection from the only input of this node to the only input of the given node.
void	addSuccessor(ReteNode succNode, int succIndex) Adds a connection from the only input of this node to a given input of the given node.
int	getNumberInputs() Returns the number of inputs of this node.
int	getNumberOutputs() Returns the number of outputs of this node.
protected java.util.List	getSuccessors() Returns the successors of this node.
abstract void	newObject(java.lang.Object obj, int input) Informs this node that an object has arrived.
protected void	propagate(java.lang.Object obj, int input) Propagates the objects from this node to the successors.

Methods inherited from class java.lang.Object

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

Field Detail

successors

private java.util.List successors

The nodes that succede this one. It's actually a list of lists, where each row represents the input index of this node, and the columns represent the connections whose source is the corresponding input.

numberInputs

private int numberInputs

The number of inputs of this node.

numberOutputs

private int numberOutputs

The number of outputs of this node.

Constructor Detail

ReteNode

public ReteNode(int numberInputs,
                int numberOutputs)

Creates a new rete node.

Parameters:

numberInputs - the number of inputs of this node.

numberOutputs - the number of inputs of this node.

Method Detail

addSuccessor

public void addSuccessor(int input,
                         ReteNode succNode,
                         int succInput)

Adds a connection from some input of this node to a given input of the given node.

Parameters:

input - the input of this node that is being connected to the given input of the successor node.

succNode - the successor to be added to this node.

succInput - the input in the successor node to where the propagated objects must be sent.

addSuccessor

public void addSuccessor(ReteNode succNode)

Adds a connection from the only input of this node to the only input of the given node.

Parameters:

succNode - the successor to be added to this node.

addSuccessor

public void addSuccessor(ReteNode succNode,
                         int succIndex)

Adds a connection from the only input of this node to a given input of the given node.

Parameters:

succNode - the successor to be added to this node.

succInput - the input in the successor node to where the propagated objects must be sent.

getNumberInputs

public int getNumberInputs()

Returns the number of inputs of this node.

Returns:

the number of inputs of this node.

getNumberOutputs

public int getNumberOutputs()

Returns the number of outputs of this node.

Returns:

the number of outputs of this node.

getSuccessors

protected java.util.List getSuccessors()

Returns the successors of this node. Available only for subclasses.

Returns:

the successors of this node.

newObject

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

Informs this node that an object has arrived.

Parameters:

obj - the object that arrived at this node.

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

propagate

protected void propagate(java.lang.Object obj,
                         int input)

Propagates the objects from this node to the successors. It's an auxiliar method that must be invoked by the subclasses in order to propagate the objects to the registered successors.

Parameters:

obj - the object to be propagated.

input - the input from which the object entered.