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Java Enterprise Edition (EE)

StateHolder


javax.faces.component
Interface StateHolder

All Known Subinterfaces:
PartialStateHolder, StateHelper
All Known Implementing Classes:
AjaxBehavior, BeanValidator, BehaviorBase, ClientBehaviorBase, DateTimeConverter, DoubleRangeValidator, EnumConverter, HtmlBody, HtmlColumn, HtmlCommandButton, HtmlCommandLink, HtmlDataTable, HtmlForm, HtmlGraphicImage, HtmlHead, HtmlInputHidden, HtmlInputSecret, HtmlInputText, HtmlInputTextarea, HtmlMessage, HtmlMessages, HtmlOutcomeTargetButton, HtmlOutcomeTargetLink, HtmlOutputFormat, HtmlOutputLabel, HtmlOutputLink, HtmlOutputText, HtmlPanelGrid, HtmlPanelGroup, HtmlSelectBooleanCheckbox, HtmlSelectManyCheckbox, HtmlSelectManyListbox, HtmlSelectManyMenu, HtmlSelectOneListbox, HtmlSelectOneMenu, HtmlSelectOneRadio, LengthValidator, LongRangeValidator, MethodExpressionActionListener, MethodExpressionValidator, MethodExpressionValueChangeListener, NumberConverter, RegexValidator, UIColumn, UICommand, UIComponent, UIComponentBase, UIData, UIForm, UIGraphic, UIInput, UIMessage, UIMessages, UINamingContainer, UIOutcomeTarget, UIOutput, UIPanel, UIParameter, UISelectBoolean, UISelectItem, UISelectItems, UISelectMany, UISelectOne, UIViewParameter, UIViewRoot
public interface StateHolder

This interface is implemented by classes that need to save their state between requests.

An implementor must implement both saveState(javax.faces.context.FacesContext) and restoreState(javax.faces.context.FacesContext, java.lang.Object) methods in this class, since these two methods have a tightly coupled contract between themselves. In other words, if there is an ineritance hierarchy, it is not permissable to have the saveState(javax.faces.context.FacesContext) and restoreState(javax.faces.context.FacesContext, java.lang.Object) methods reside at different levels of the hierarchy.

An implementor must have a public no-args constructor.

Method Summary
 boolean isTransient()
          If true, the Object implementing this interface must not participate in state saving or restoring.
 void restoreState(FacesContext context, java.lang.Object state)
           Perform any processing required to restore the state from the entries in the state Object.
 java.lang.Object saveState(FacesContext context)
           Gets the state of the instance as a Serializable Object.
 void setTransient(boolean newTransientValue)
          Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
 

Method Detail

saveState

java.lang.Object saveState(FacesContext context)

Gets the state of the instance as a Serializable Object.

If the class that implements this interface has references to instances that implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the saveState(javax.faces.context.FacesContext) method on all those instances as well. This method must not save the state of children and facets. That is done via the StateManager

This method must not alter the state of the implementing object. In other words, after executing this code:

 Object state = component.saveState(facesContext);
 

component should be the same as before executing it.

The return from this method must be Serializable

Throws:
java.lang.NullPointerException - if context is null

restoreState

void restoreState(FacesContext context,
                  java.lang.Object state)

Perform any processing required to restore the state from the entries in the state Object.

If the class that implements this interface has references to instances that also implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the restoreState(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

Throws:
java.lang.NullPointerException - if either context or state are null

isTransient

boolean isTransient()

If true, the Object implementing this interface must not participate in state saving or restoring.

setTransient

void setTransient(boolean newTransientValue)

Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

Parameters:
newTransientValue - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.


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