Examples of javax.el.MethodExpression

javax.el.MethodExpression
An Expression that refers to a method on an object.
The {@link ExpressionFactory#createMethodExpression} methodcan be used to parse an expression string and return a concrete instance of MethodExpression that encapsulates the parsed expression. The {@link FunctionMapper} is used at parse time, not evaluation time, so one is not needed to evaluate an expression using this class. However, the {@link ELContext} is needed at evaluation time.
The {@link #getMethodInfo} and {@link #invoke} methods will evaluate the expression each time they are called. The {@link ELResolver} in the ELContext is used to resolve the top-level variables and to determine the behavior of the . and [] operators. For any of the two methods, the {@link ELResolver#getValue} method is used to resolve all properties up to but excluding the last one. This provides the base object on which the method appears. If the base object is null, a PropertyNotFoundException must be thrown. At the last resolution, the final property is then coerced to a String, which provides the name of the method to be found. A method matching the name and expected parameters provided at parse time is found and it is either queried or invoked (depending on the method called on this MethodExpression).

See the notes about comparison, serialization and immutability in the {@link Expression} javadocs. @see ELResolver @see Expression @see ExpressionFactory @since JSP 2.1


  public void broadcast(javax.faces.event.FacesEvent event) throws javax.faces.event.AbortProcessingException {
    super.broadcast(event);
    
    FacesContext facesContext = FacesContext.getCurrentInstance();
    MethodExpression me = getSelectListener();
    
    if (me != null && event instanceof org.primefaces.event.SelectEvent) {
      me.invoke(facesContext.getELContext(), new Object[] {event});
    }
  }

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    super.broadcast(event);
    
    FacesContext facesContext = FacesContext.getCurrentInstance();
    
    if(event instanceof org.primefaces.event.CloseEvent) {
      MethodExpression closeMe = getCloseListener();
      
      if(closeMe != null) {
        closeMe.invoke(facesContext.getELContext(), new Object[] {event});
      }
    } else if(event instanceof org.primefaces.event.ToggleEvent) {
      MethodExpression toggleMe = getToggleListener();
      
      if(toggleMe != null) {
        toggleMe.invoke(facesContext.getELContext(), new Object[] {event});
      }
    } else if(event instanceof org.primefaces.event.ResizeEvent) {
      MethodExpression resizeMe = getResizeListener();
      
      if(resizeMe != null) {
        resizeMe.invoke(facesContext.getELContext(), new Object[] {event});
      }
    }
  }

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        }


        if (params == null)
            params = new Class[0];


        MethodExpression methodExpression;


        try
        {
            methodExpression = getExpressionFactory().createMethodExpression(threadELContext(), reference,
                                                                             Object.class, params);

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                    }
                }
                
                String [] targetsArray = StringUtils.splitShortString(targets, ' ');
                String attributeExpressionString = attributeNameValueExpression.getExpressionString();
                MethodExpression methodExpression = null;
                
                // if the expression String contains a reference to the current composite
                // component #{cc}, the MethodExpression has to be invoked indirectly (via
                // a ValueExpression that points to the real MethodExpression). This happens
                // when other composite components are nested in composite components' implementations.

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                        .getValueExpression(faceletContext, Boolean.class));
            }
        }
        if (_listener != null)
        {
            MethodExpression expr = _listener.getMethodExpression(
                    faceletContext, Void.TYPE, AJAX_BEHAVIOR_LISTENER_SIG);
            AjaxBehaviorListener abl = new AjaxBehaviorListenerImpl(expr);
            ajaxBehavior.addAjaxBehaviorListener(abl);
        }
        if (_onerror != null)

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        Class<? extends ComponentSystemEvent> eventClass = getEventClass(ctx);
        
        // Note: The listener attribute can now also take a zero-argument MethodExpression,
        // thus we need two different MethodExpressions (see MYFACES-2503 for details).
        MethodExpression methodExpOneArg 
                = listener.getMethodExpression(ctx, void.class, COMPONENT_SYSTEM_EVENT_PARAMETER);
        MethodExpression methodExpZeroArg
                = listener.getMethodExpression(ctx, void.class, EMPTY_CLASS_ARRAY);
        
        if (eventClass == PreRenderViewEvent.class)
        {
            // ensure ViewRoot for PreRenderViewEvent

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     */
    public MethodExpression getMethodExpression(FaceletContext ctx, Class type, Class[] paramTypes)
    {
        try
        {
            MethodExpression methodExpression = null;
            
            // From this point we can suppose this attribute contains a ELExpression
            // Now we have to check if the expression points to a composite component attribute map
            // and if so deal with it as an indirection.
            if (isCompositeComponentAttributeMapExpression())

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            this._attr = attr;
        }


        public void applyMetadata(FaceletContext ctx, Object instance)
        {
            MethodExpression expr = _attr.getMethodExpression(ctx, String.class, ActionSourceRule.ACTION_SIG);
            ((ActionSource2) instance).setActionExpression(expr);
        }

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            // It seems that MethodExpressionActionListener from API contains support for it but there is one big
            // problem - one-arg constructor will not preserve the current VariableMapper.
            // This is a problem when using facelets and <ui:decorate/> with EL params (see MYFACES-2541 for details).
            // So we must create two MethodExpressions here - both are created from the current 
            // facelets context and thus varibale mapping will work.
            final MethodExpression methodExpressionOneArg = _attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_LISTENER_SIG);
            final MethodExpression methodExpressionZeroArg = _attr.getMethodExpression(ctx, null, ActionSourceRule.ACTION_SIG);
            if (((AbstractFaceletContext)ctx).isUsingPSSOnThisView())
            {
                ((ActionSource2) instance).addActionListener(
                        new PartialMethodExpressionActionListener(methodExpressionOneArg, methodExpressionZeroArg));
            }

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            // It seems that MethodExpressionValueChangeListener from API contains support for it but there is one big
            // problem - one-arg constructor will not preserve the current VariableMapper.
            // This is a problem when using facelets and <ui:decorate/> with EL params (see MYFACES-2541 for details).
            // So we must create two MethodExpressions here - both are created from the current 
            // facelets context and thus variable mapping will work.
            final MethodExpression methodExpressionOneArg = attr.getMethodExpression(ctx, null, VALUECHANGE_SIG);
            final MethodExpression methodExpressionZeroArg = attr.getMethodExpression(ctx, null, EMPTY_CLASS_ARRAY);
            if (((AbstractFaceletContext)ctx).isUsingPSSOnThisView())
            {
                ((EditableValueHolder) instance).addValueChangeListener(
                        new PartialMethodExpressionValueChangeListener(methodExpressionOneArg, methodExpressionZeroArg));
            }

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