scpc.model.support

Class SpelEvalHelper<T>

java.lang.Object

scpc.model.support.EvalHelper<T>

scpc.model.support.SpelEvalHelper<T>

Type Parameters:

T - type of real cart item.

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

A Spring Expression Language formula evaluator.
使用Spring Expression Language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
SpelEvalHelper()

Method Summary

Methods

Modifier and Type	Method and Description
EvalHelper<T>	bindVaribles(IRule<T> rule, SingleItem<T> item) Bind rule and item into evaluation context.
EvalHelper<T>	bindVarValue(java.lang.String variable, java.lang.Object value) Bind variable with value into context.
<R> R	eval(java.lang.String formula) Evaluate formula as numeric or boolean.
Expression	getExpression(java.lang.String spel)
protected void	purgeBind() Clear all binding variable in context.

Methods inherited from class scpc.model.support.EvalHelper

bindVaribles, getPreviousRulePrefix, getVarContainsCount, getVarRegularPrice, getVarSalePrice, getVarSerialNum, getVarSumOfContainsRegularPrice, getVarSumOfContainsSalePrice, getVarSumOfSerialRegularPrice, getVarSumOfSerialSalePrice, validateJSVariable, validJSVarName

Methods inherited from class java.lang.Object

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

Constructor Detail

SpelEvalHelper

public SpelEvalHelper()

Method Detail

getExpression

public Expression getExpression(java.lang.String spel)

bindVaribles

public EvalHelper<T> bindVaribles(IRule<T> rule,
                         SingleItem<T> item)

Description copied from class: EvalHelper

Bind rule and item into evaluation context.
將促販規則與商品綁定到後評估的環境

Overrides:

bindVaribles in class EvalHelper<T>

Parameters:

rule -

item -

Returns:

See Also:

EvalHelper.bindVaribles(scpc.model.IRule, scpc.model.SingleItem)

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 -
Must be a javascript qualified variable name.

value -

Returns:

See Also:

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

eval

public <R> R 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>

Type Parameters:

R -

Parameters:

formula -

Returns:

Throws:

javax.script.ScriptException

See Also:

EvalHelper.eval(java.lang.String)

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>