ValueHolder (Java EE 5 SDK)

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Java EE 5 SDK

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javax.faces.component Interface ValueHolder

所有已知子接口:: EditableValueHolder

public interface ValueHolder

ValueHolder is an interface that may be implemented by any concrete UIComponent that wishes to support a local value, as well as access data in the model tier via a value expression, and support conversion between String and the model tier data's native data type.

方法摘要
`Converter`	`getConverter()` Return the `Converter` (if any) that is registered for this `UIComponent`.
`Object`	`getLocalValue()` Return the local value of this `UIComponent` (if any), without evaluating any associated `ValueExpression`.
`Object`	`getValue()` Gets the value of this `UIComponent`.
`void`	`setConverter(Converter converter)` Set the `Converter` (if any) that is registered for this `UIComponent`.
`void`	`setValue(Object value)` Set the value of this `UIComponent` (if any).

方法详细信息

getLocalValue

Object getLocalValue()

Return the local value of this UIComponent (if any), without evaluating any associated ValueExpression.

getValue

Object getValue()

Gets the value of this UIComponent. First, consult the local value property of this component. If non-null return it. If null, see if we have a ValueExpression for the value property. If so, return the result of evaluating the property, otherwise return null. Note that because the specification for UIComponent.setValueBinding(java.lang.String, javax.faces.el.ValueBinding) requires a call through to UIComponent.setValueExpression(java.lang.String, javax.el.ValueExpression), legacy tags will continue to work.