MethodExpressionValidator (Java EE 5)

Java EE API

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javax.faces.validator Class MethodExpressionValidator

java.lang.Object
  extended by javax.faces.validator.MethodExpressionValidator
All Implemented Interfaces:
EventListener, StateHolder, Validator
public class MethodExpressionValidator
extends Object
implements Validator, StateHolder

Implements: Validator, StateHolder

MethodExpressionValidator 是一个 Validator，它包装了 MethodExpression，并通过对 MethodExpression 识别的对象执行验证方法以进行验证。

英文文档：

MethodExpressionValidator is a Validator that wraps a MethodExpression, and it performs validation by executing a method on an object identified by the MethodExpression.

Field Summary
 
Fields inherited from interface javax.faces.validator.Validator
NOT_IN_RANGE_MESSAGE_ID
 
Constructor Summary
MethodExpressionValidator()
           
MethodExpressionValidator(MethodExpression methodExpression)
          Construct a Validator that contains a MethodExpression.
 
Method Summary
 boolean isTransient()
          If true, the Object implementing this interface must not participate in state saving or restoring.
 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 transientValue)
          Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.
 void validate(FacesContext context, UIComponent component, Object value)
          Perform the correctness checks implemented by this Validator against the specified UIComponent.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

public MethodExpressionValidator()
英文文档：

MethodExpressionValidator

public MethodExpressionValidator()

public MethodExpressionValidator(MethodExpression methodExpression)

构造包含 MethodExpression 的 Validator。

英文文档：

MethodExpressionValidator

public MethodExpressionValidator(MethodExpression methodExpression)

Construct a Validator that contains a MethodExpression.

Method Detail

public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException
ThrowsNullPointerException: NullPointerException 如果 context 或 component 为 null
ThrowsValidatorException: NullPointerException 如果验证失败
英文文档：

validate

public void validate(FacesContext context,
                     UIComponent component,
                     Object value)
              throws ValidatorException
Description copied from interface: Validator

Perform the correctness checks implemented by this Validator against the specified UIComponent. If any violations are found, a ValidatorException will be thrown containing the FacesMessage describing the failure.

Specified by:
validate in interface Validator
Parameters:
context - FacesContext for the request we are processing
component - UIComponent we are checking for correctness
value - the value to validate
Throws:
NullPointerException - if context or component is null
ValidatorException - if validation fails

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 transientValue)
英文文档：

setTransient

public void setTransient(boolean transientValue)
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:
transientValue - 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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