MethodExpressionValueChangeListener (Java EE 5 SDK)

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Java EE 5 SDK

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javax.faces.event Class MethodExpressionValueChangeListener

java.lang.Object
  extended by javax.faces.event.MethodExpressionValueChangeListener
所有已实现的接口:
EventListener, StateHolder, FacesListener, ValueChangeListener
public class MethodExpressionValueChangeListener
extends Object
implements ValueChangeListener, StateHolder

MethodExpressionValueChangeListener is a ValueChangeListener that wraps a MethodExpression. When it receives a ValueChangeEvent, it executes a method on an object identified by the MethodExpression.

构造器摘要
MethodExpressionValueChangeListener()
           
MethodExpressionValueChangeListener(MethodExpression methodExpression)
          Construct a ValueChangeListener that contains a MethodExpression.
 
方法摘要
 boolean isTransient()
          If true, the Object implementing this interface must not participate in state saving or restoring.
 void processValueChange(ValueChangeEvent valueChangeEvent)
          Invoked when the value change described by the specified ValueChangeEvent occurs.
 void restoreState(FacesContext context, Object state)
           Perform any processing required to restore the state from the entries in the state Object.
 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.
 
类方法继承 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

构造器详细信息

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener()

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener(MethodExpression methodExpression)

Construct a ValueChangeListener that contains a MethodExpression.

方法详细信息

processValueChange

public void processValueChange(ValueChangeEvent valueChangeEvent)
                        throws AbortProcessingException
Description copied from interface: ValueChangeListener

Invoked when the value change described by the specified ValueChangeEvent occurs.

规范说明:
processValueChange in interface ValueChangeListener
参数:
valueChangeEvent - The ValueChangeEvent that has occurred
抛出异常:
NullPointerException
AbortProcessingException - Signal the JavaServer Faces implementation that no further processing on the current event should be performed

saveState

public Object saveState(FacesContext context)
Description copied from interface: StateHolder

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 StateHolder.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

规范说明:
saveState in interface StateHolder

restoreState

public void restoreState(FacesContext context,
                         Object state)
Description copied from interface: StateHolder

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 StateHolder.restoreState(javax.faces.context.FacesContext, java.lang.Object) method on all those instances as well.

规范说明:
restoreState in interface StateHolder

isTransient

public boolean isTransient()
Description copied from interface: StateHolder

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

规范说明:
isTransient in interface StateHolder

setTransient

public void setTransient(boolean newTransientValue)
Description copied from interface: StateHolder

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

规范说明:
setTransient in interface StateHolder
参数:
newTransientValue - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.
概述  软件包   类  树  已过时  索引  帮助 
Java EE 5 SDK

深圳电信培训中心.徐海蛟老师.
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摘要: 嵌套 | 字段 | 构造器 | 方法 详细信息: 字段 | 构造器 | 方法
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