Package org.rossonet.ext.rules.mvel

Class MVELRule

java.lang.Object

org.rossonet.ext.rules.core.BasicRule

org.rossonet.ext.rules.mvel.MVELRule

All Implemented Interfaces:

java.lang.Comparable<Rule>, Rule

public class MVELRule
extends BasicRule

A Rule implementation that uses MVEL to evaluate and execute the rule.

Field Summary

Fields inherited from class org.rossonet.ext.rules.core.BasicRule

description, name, priority

Fields inherited from interface org.rossonet.ext.rules.api.Rule

DEFAULT_DESCRIPTION, DEFAULT_NAME, DEFAULT_PRIORITY

Constructor Summary

Constructors

Constructor	Description
MVELRule()	Create a new MVEL rule.
MVELRule(org.mvel2.ParserContext parserContext)	Create a new MVEL rule.

Method Summary

Modifier and Type	Method	Description
MVELRule	description(java.lang.String description)	Set rule description.
boolean	evaluate(Facts facts)	This method implements the rule's condition(s).
void	execute(Facts facts)	This method implements the rule's action(s).
MVELRule	name(java.lang.String name)	Set rule name.
MVELRule	priority(int priority)	Set rule priority.
MVELRule	then(java.lang.String action)	Add an action specified as an MVEL expression to the rule.
MVELRule	when(java.lang.String condition)	Specify the rule's condition as MVEL expression.

Methods inherited from class org.rossonet.ext.rules.core.BasicRule

compareTo, equals, getDescription, getName, getPriority, hashCode, setDescription, setPriority, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

MVELRule

public MVELRule()

Create a new MVEL rule.

MVELRule

public MVELRule(org.mvel2.ParserContext parserContext)

Create a new MVEL rule.

Parameters:

parserContext - used to parse condition/action expressions

Method Detail

description

public MVELRule description(java.lang.String description)

Set rule description.

Parameters:

description - of the rule

Returns:

this rule

evaluate

public boolean evaluate(Facts facts)

Description copied from class: BasicRule

This method implements the rule's condition(s). Implementations should handle any runtime exception and return true/false accordingly

Specified by:

evaluate in interface Rule

Overrides:

evaluate in class BasicRule

Returns:

true if the rule should be applied given the provided facts, false otherwise

execute

public void execute(Facts facts)
             throws java.lang.Exception

Description copied from class: BasicRule

This method implements the rule's action(s).

Specified by:

execute in interface Rule

Overrides:

execute in class BasicRule

Throws:

java.lang.Exception - thrown if an exception occurs when performing action(s)

name

public MVELRule name(java.lang.String name)

Set rule name.

Parameters:

name - of the rule

Returns:

this rule

priority

public MVELRule priority(int priority)

Set rule priority.

Parameters:

priority - of the rule

Returns:

this rule

then

public MVELRule then(java.lang.String action)

Add an action specified as an MVEL expression to the rule.

Parameters:

action - to add to the rule

Returns:

this rule

when

public MVELRule when(java.lang.String condition)

Specify the rule's condition as MVEL expression.

Parameters:

condition - of the rule

Returns:

this rule