jess
Class Defquery

java.lang.Object
  jess.Node
      jess.HasLHS
          jess.Defquery

All Implemented Interfaces:

Modular, Named, jess.NodeSink, java.io.Serializable, Visitable

public class Defquery

extends HasLHS

implements java.io.Serializable

A Defquery is a way of requesting specific information in working memory from procedural code. These are usually constructed by the parser when it sees a "defquery" construct.

(C) 2005 Sandia National Laboratories

See Also:

Serialized Form

Field Summary

static java.lang.String

QUERY_TRIGGER String prepended to query names to form backwards chaining goals

Fields inherited from class jess.Node

LEFT, RIGHT

Constructor Summary

Defquery(java.lang.String name, java.lang.String docstring, Rete engine)

Method Summary

java.lang.Object	accept(Visitor jv) A proper accept() implementation should call one of the visitXXX() methods on the Visitor.
void	addCE(jess.ConditionalElementX ce, Rete engine) Add a conditional element to this construct
void	addQueryVariable(Variable v)
void	callNodeLeft(int tag, Token token, Context context) Recieve satisfied queries
java.lang.String	getConstructType() Return the type of construct this object is; for example, "defrule", "deftemplate", etc.
int	getMaxBackgroundRules() Return the maximum number of rules that will fire during this query.
int	getNVariables()
java.lang.String	getQueryTriggerName()
Variable	getQueryVariable(int i)
void	setMaxBackgroundRules(int maxBackgroundRules) Set the maximum number of rules that will fire during this query.
java.lang.String	toString()

Methods inherited from class jess.HasLHS

addNode, getConditionalElements, getDisplayName, getDocstring, getGroupSize, getModule, getName, getNext, getNodeCount, getNodeIndexHash, getNodes, getPatternCount, listNodes, setLHS, setNodeIndexHash

Methods inherited from class jess.Node

addJessListener, getSuccessors, removeJessListener

Methods inherited from class java.lang.Object

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

Field Detail

QUERY_TRIGGER

public static final java.lang.String QUERY_TRIGGER

String prepended to query names to form backwards chaining goals

See Also:

Constant Field Values

Constructor Detail

Defquery

public Defquery(java.lang.String name,
                java.lang.String docstring,
                Rete engine)
         throws JessException

Method Detail

getMaxBackgroundRules

public int getMaxBackgroundRules()

Return the maximum number of rules that will fire during this query. Queries call Rete.run() when they are executed to allow backward chaining to occur. No more than this number of rules will be allowed to fire.

Returns:

As described

setMaxBackgroundRules

public void setMaxBackgroundRules(int maxBackgroundRules)

Set the maximum number of rules that will fire during this query.

Parameters:

maxBackgroundRules - The new value for this property

See Also:

getMaxBackgroundRules()

callNodeLeft

public void callNodeLeft(int tag,
                         Token token,
                         Context context)
                  throws JessException

Recieve satisfied queries

Throws:

JessException

getQueryTriggerName

public java.lang.String getQueryTriggerName()

addQueryVariable

public void addQueryVariable(Variable v)

getNVariables

public int getNVariables()

getQueryVariable

public Variable getQueryVariable(int i)

addCE

public void addCE(jess.ConditionalElementX ce,
                  Rete engine)
           throws JessException

Description copied from class: HasLHS

Add a conditional element to this construct

Overrides:

addCE in class HasLHS

Throws:

JessException

toString

public java.lang.String toString()

accept

public java.lang.Object accept(Visitor jv)

Description copied from interface: Visitable

A proper accept() implementation should call one of the visitXXX() methods on the Visitor.

Specified by:

accept in interface Visitable

Specified by:

accept in class HasLHS

getConstructType

public final java.lang.String getConstructType()

Description copied from interface: Named

Return the type of construct this object is; for example, "defrule", "deftemplate", etc.

Specified by:

getConstructType in interface Named

Returns:

the construct type