scpc.model.support

Class JsEvalHelper<T>

java.lang.Object

scpc.model.support.EvalHelper<T>

scpc.model.support.JsEvalHelper<T>

Type Parameters:

T - type of real cart item.

public abstract class JsEvalHelper<T>
extends EvalHelper<T>

A JavaScript formula evaluator using JDK build in JS Engin.
使用JDK內建的JS引擎做為公式解譯工具

Author:

Kent Yeh

Field Summary

Fields inherited from class scpc.model.support.EvalHelper

JS_NAME_LOCATOR, JS_NAME_VALIDATOR

Constructor Summary

Constructors

Constructor and Description
JsEvalHelper()

Method Summary

Methods

Modifier and Type	Method and Description
EvalHelper<T>	bindVarValue(java.lang.String variable, java.lang.Object value) Bind variable with value into context.
java.lang.Object	eval(java.lang.String formula) Evaluate formula as numeric or boolean.
protected javax.script.ScriptEngine	getScriptEngine()
protected void	purgeBind() Clear all binding variable in context.

Methods inherited from class scpc.model.support.EvalHelper

bindVaribles, bindVaribles, getPreviousRulePrefix, getVarContainsCount, getVarOriginalPrice, getVarSalePrice, getVarSerialNum, getVarSumOfContainsOriginalPrice, getVarSumOfContainsSalePrice, getVarSumOfSerialOriginalPrice, getVarSumOfSerialSalePrice, validateJSVariable, validJSVarName

Methods inherited from class java.lang.Object

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

Constructor Detail

JsEvalHelper

public JsEvalHelper()

Method Detail

getScriptEngine

protected javax.script.ScriptEngine getScriptEngine()

bindVarValue

public EvalHelper<T> bindVarValue(java.lang.String variable,
                         java.lang.Object value)

Description copied from class: EvalHelper

Bind variable with value into context.
評估的環境中綁定變數與值

Specified by:

bindVarValue in class EvalHelper<T>

Parameters:

variable -

value -

Returns:

See Also:

EvalHelper.bindVarValue(java.lang.String, java.lang.Object)

purgeBind

protected void purgeBind()

Description copied from class: EvalHelper

Clear all binding variable in context.
清除評估環境中所有的變數

Specified by:

purgeBind in class EvalHelper<T>

See Also:

EvalHelper.purgeBind()

eval

public java.lang.Object eval(java.lang.String formula)
                      throws javax.script.ScriptException

Description copied from class: EvalHelper

Evaluate formula as numeric or boolean.
將公式估值為數值或布林

Specified by:

eval in class EvalHelper<T>

Parameters:

formula -

Returns:

Throws:

javax.script.ScriptException

See Also:

EvalHelper.eval(java.lang.String)