ValueHolder (Java EE 5 SDK)

javax.faces.component Interface ValueHolder

所有已知子接口:

EditableValueHolder

所有已知实现子孙类:

HtmlInputHidden, HtmlInputSecret, HtmlInputText, HtmlInputTextarea, HtmlOutputFormat, HtmlOutputLabel, HtmlOutputLink, HtmlOutputText, HtmlSelectBooleanCheckbox, HtmlSelectManyCheckbox, HtmlSelectManyListbox, HtmlSelectManyMenu, HtmlSelectOneListbox, HtmlSelectOneMenu, HtmlSelectOneRadio, UIInput, UIOutput, UISelectBoolean, UISelectMany, UISelectOne

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.

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.

setValue

void setValue(Object value)

Set the value of this UIComponent (if any).

参数:

value - The new local value

getConverter

Converter getConverter()

Return the Converter (if any) that is registered for this UIComponent.

setConverter

void setConverter(Converter converter)

Set the Converter (if any) that is registered for this UIComponent.

参数:

converter - New Converter (or null)

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