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PatternBuilder (Drools 4.0.0.11754MR2 API) - JBoss RULES 4.0.0.11754MR2 API 英文版文档

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org.drools.reteoo.builder
Class PatternBuilder

java.lang.Object
  org.drools.reteoo.builder.PatternBuilder

All Implemented Interfaces:

ReteooComponentBuilder

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public class PatternBuilder
extends Object
implements ReteooComponentBuilder

A builder for patterns

Author:

etirelli

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Constructor Summary
PatternBuilder()

 

Method Summary
List	attachAlphaNodes(BuildContext context, BuildUtils utils, Pattern pattern)
void	build(BuildContext context, BuildUtils utils, RuleConditionElement rce)           Builds and attach if needed the given RuleConditionalElement
boolean	requiresLeftActivation(BuildUtils utils, RuleConditionElement rce)           A boolean function that indicates if the builder requires a previous left (tuple) activation in order to corretly build the given component.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

PatternBuilder

public PatternBuilder()

Method Detail

build

public void build(BuildContext context,
                  BuildUtils utils,
                  RuleConditionElement rce)

Description copied from interface: ReteooComponentBuilder

Builds and attach if needed the given RuleConditionalElement

Specified by:

build in interface ReteooComponentBuilder

Parameters:

context - current build context

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attachAlphaNodes

public List attachAlphaNodes(BuildContext context,
                             BuildUtils utils,
                             Pattern pattern)
                      throws InvalidPatternException

Throws:

InvalidPatternException

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requiresLeftActivation

public boolean requiresLeftActivation(BuildUtils utils,
                                      RuleConditionElement rce)

Description copied from interface: ReteooComponentBuilder

A boolean function that indicates if the builder requires a previous left (tuple) activation in order to corretly build the given component. In other words, if it returns true and no previous TupleSource is already created, an InitialFact pattern must be added with appropriate left input adapter for the network to be correctly built. For instance, NOT / EXISTS / ACCUMULATE are examples of builders that must return true for this method, while PATTERN must return false.

Specified by:

requiresLeftActivation in interface ReteooComponentBuilder

rce - the element to be built

Returns:

true if a tuple source is required, false otherwise.

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