MethodExpressionValueChangeListener (Java EE 5)

Java EE API

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javax.faces.event Class MethodExpressionValueChangeListener

java.lang.Object
  extended by javax.faces.event.MethodExpressionValueChangeListener
All Implemented Interfaces:
EventListener, StateHolder, FacesListener, ValueChangeListener
public class MethodExpressionValueChangeListener
extends Object
implements ValueChangeListener, StateHolder

Implements: ValueChangeListener, StateHolder

MethodExpressionValueChangeListener 是包装 MethodExpression 的 ValueChangeListener。当收到一个 ValueChangeEvent 时，它对 MethodExpression 标识的对象执行一个方法。

英文文档：

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

Constructor Summary
MethodExpressionValueChangeListener()
           
MethodExpressionValueChangeListener(MethodExpression methodExpression)
          Construct a ValueChangeListener that contains a MethodExpression.
 
Method Summary
 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.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

public MethodExpressionValueChangeListener()
英文文档：

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener()

public MethodExpressionValueChangeListener(MethodExpression methodExpression)

构造包含 MethodExpression 的 ValueChangeListener。

英文文档：

MethodExpressionValueChangeListener

public MethodExpressionValueChangeListener(MethodExpression methodExpression)

Construct a ValueChangeListener that contains a MethodExpression.

Method Detail

public void processValueChange(ValueChangeEvent valueChangeEvent) throws AbortProcessingException
ThrowsNullPointerException: NullPointerException
ThrowsAbortProcessingException: NullPointerException 通知 JavaServer Face 实现不应该继续处理当前事件
英文文档：

processValueChange

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

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

Specified by:
processValueChange in interface ValueChangeListener
Parameters:
valueChangeEvent - The ValueChangeEvent that has occurred
Throws:
NullPointerException
AbortProcessingException - Signal the JavaServer Faces implementation that no further processing on the current event should be performed

public Object saveState(FacesContext context)
英文文档：

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

Specified by:
saveState in interface StateHolder

public void restoreState(FacesContext context, Object state)
英文文档：

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.

Specified by:
restoreState in interface StateHolder

public boolean isTransient()
英文文档：

isTransient

public boolean isTransient()
Description copied from interface: StateHolder

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

Specified by:
isTransient in interface StateHolder

public void setTransient(boolean newTransientValue)
英文文档：

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.

Specified by:
setTransient in interface StateHolder
Parameters:
newTransientValue - boolean pass true if this Object will participate in state saving or restoring, otherwise pass false.
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Copyright 2007 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.

一看就知道只有菜鸟才干这么无知的事啦。

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