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 package javax.faces.event;
 

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

 
 
     StateHolder {
 
 
     // ------------------------------------------------------ Instance Variables
     
     private MethodExpression methodExpressionOneArg = null;
     private MethodExpression methodExpressionZeroArg = null;
     private boolean isTransient;
     private final static Class[] VALUECHANGE_LISTENER_ZEROARG_SIG = new Class[] { };
     
 
     public MethodExpressionValueChangeListener() { }

   

Construct a ValueChangeListener that contains a javax.el.MethodExpression.To accomodate method expression targets that take no arguments instead of taking a ValueChangeEvent argument, the implementation of this class must take the argument methodExpressionOneArg, extract its expression string, and create another MethodExpression whose expected param types match those of a zero argument method. The usage requirements for both of these MethodExpression instances are described in processValueChange(javax.faces.event.ValueChangeEvent).

Parameters:
methodExpressionOneArg a MethodExpression that points to a method that returns void and takes a single argument of type ValueChangeEvent.
 
     public MethodExpressionValueChangeListener(MethodExpression methodExpressionOneArg) {
 
         super();
         this. = methodExpressionOneArg;
         FacesContext context = FacesContext.getCurrentInstance();
         ELContext elContext = context.getELContext();
         this. = context.getApplication().
                 getExpressionFactory().createMethodExpression(elContext
                   methodExpressionOneArg.getExpressionString(), Void.class
                  );
    }

   

Construct a ValueChangeListener that contains a javax.el.MethodExpression.

    public MethodExpressionValueChangeListener(MethodExpression methodExpressionOneArg,
            MethodExpression methodExpressionZeroArg) {
        super();
        this. = methodExpressionOneArg;
        this. = methodExpressionZeroArg;
    }
    // ------------------------------------------------------- Event Method

    

Call through to the javax.el.MethodExpression passed in our constructor. First, try to invoke the MethodExpression passed to the constructor of this instance, passing the argument ValueChangeEvent as the argument. If a javax.el.MethodNotFoundException is thrown, call to the zero argument MethodExpression derived from the MethodExpression passed to the constructor of this instance. If that fails for any reason, throw an AbortProcessingException, including the cause of the failure.

 
    public void processValueChange(ValueChangeEvent valueChangeEventthrows AbortProcessingException {
                         
        if (valueChangeEvent == null) {
            throw new NullPointerException();
        }
        FacesContext context = FacesContext.getCurrentInstance();
        ELContext elContext = context.getELContext();
        // PENDING: The corresponding code in MethodExpressionActionListener
        // has an elaborate message capture, logging, and rethrowing block.
        // Why not here?
        try {
            .invoke(elContextnew Object[] {valueChangeEvent});
        } catch (MethodNotFoundException mnf) {
            if (null != ) {
                try {
                    // try to invoke a no-arg version
                    .invoke(elContextnew Object[]{});
                }
                catch (ELException ee) {
                    throw new AbortProcessingException(ee.getMessage(), ee.getCause());
                }
            }
        } catch (ELException ee) {
            throw new AbortProcessingException(ee.getMessage(), ee.getCause());
        }
    }
    // ------------------------------------------------ Methods from StateHolder


    

Both javax.el.MethodExpression instances described in the constructor must be saved.

    public Object saveState(FacesContext context) {
        if (context == null) {
            throw new NullPointerException();
        }
        return new Object[] {  };
    }


    

Both javax.el.MethodExpression instances described in the constructor must be restored.

    public void restoreState(FacesContext contextObject state) {
        if (context == null) {
            throw new NullPointerException();
        }
        if (state == null) {
            return;
        }
         = (MethodExpression) ((Object[]) state)[0];
         = (MethodExpression) ((Object[]) state)[1];
    }
    public boolean isTransient() {
        return ;
    }
    public void setTransient(boolean newTransientValue) {
         = newTransientValue;
    }
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