org.yawlfoundation.yawl.worklet.support

Class ConditionEvaluator

java.lang.Object

org.yawlfoundation.yawl.worklet.support.ConditionEvaluator

public class ConditionEvaluator
extends java.lang.Object

ConditionEvaluator is a member class of the Worklet Dynamic Selection Service. It is used here by the RdrNode class to evaluate the its condition and thus allow the rule traversal to occur. It takes an expression (provided as a String) and evaluates it to a boolean value. The datalist member is a JDOM Element that, if supplied, will be used to retrieve values for any variable names used in the expression. The expression may contain the following operators: - Arithmetic: * / + - - Comparison: = != > < >= <= - Logical: & | ! The order of precedence observed is: 1. * / 2. + - 3. the comparison operators 4. the logical operators Operands may be numeric literals, string literals or variable names. Parentheses may be used to group sub-expressions. An RdrConditionException will be raised if the expression is malformed or does not evaluate to a boolean value (see getMessage() for the kinds of things that can go wrong).

Author:

Michael Adams v0.8, 04-09/2006

Constructor Summary

Constructors

Constructor and Description
ConditionEvaluator()

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(java.lang.String cond, Element data)
boolean	evaluate(java.lang.String cond, Element data, boolean isDesignTime) Evaluate the condition using the datalist of variables and values.
static void	main(java.lang.String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

ConditionEvaluator

public ConditionEvaluator()

Method Detail

evaluate

public boolean evaluate(java.lang.String cond,
                        Element data,
                        boolean isDesignTime)
                 throws RdrConditionException

Evaluate the condition using the datalist of variables and values.

Parameters:

cond - - the condition to evaluate

data - - the datalist of variables and values

Returns:

the boolean result of the evaluation

Throws:

RdrConditionException

evaluate

public boolean evaluate(java.lang.String cond,
                        Element data)
                 throws RdrConditionException

Throws:

RdrConditionException

main

public static void main(java.lang.String[] args)