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

                                                            String attributeExpressionString, 
                                                            ValueExpression attributeNameValueExpression, 
                                                            boolean ccAttrMeRedirection)
    {
        // target is EditableValueHolder
        MethodExpression methodExpression = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                createMethodExpression(elContext,
                        attributeExpressionString, Void.TYPE,
                        VALUE_CHANGE_LISTENER_SIGNATURE), attributeNameValueExpression);


        MethodExpression methodExpression2 = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                createMethodExpression(elContext,
                        attributeExpressionString, Void.TYPE,
                        EMPTY_CLASS_ARRAY), attributeNameValueExpression);


        //Store the method expression to the topLevelComponent to allow reference it through EL

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                                                   String attributeExpressionString,
                                                   ValueExpression attributeNameValueExpression,
                                                   boolean ccAttrMeRedirection)
    {
        // target is ActionSource2
        MethodExpression methodExpression
                = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                createMethodExpression(elContext,
                        attributeExpressionString, null, EMPTY_CLASS_ARRAY),
                        attributeNameValueExpression);

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            actionListener = new RedirectMethodExpressionValueExpressionActionListener(
                                         attributeNameValueExpression);
        }
        else
        {
            MethodExpression methodExpression = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                    createMethodExpression(elContext,
                       attributeExpressionString, Void.TYPE, ACTION_LISTENER_SIGNATURE), attributeNameValueExpression);


            MethodExpression methodExpression2 = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                    createMethodExpression(elContext,
                            attributeExpressionString, Void.TYPE, EMPTY_CLASS_ARRAY), attributeNameValueExpression);


            actionListener = new MethodExpressionActionListener(methodExpression, methodExpression2);
        }

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        {
            validator = new RedirectMethodExpressionValueExpressionValidator(attributeNameValueExpression);
        }
        else
        {
            MethodExpression methodExpression = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                    createMethodExpression(elContext,
                            attributeExpressionString, Void.TYPE,
                            VALIDATOR_SIGNATURE), attributeNameValueExpression);


            validator = new MethodExpressionValidator(methodExpression);

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            valueChangeListener = new RedirectMethodExpressionValueExpressionValueChangeListener(
                    attributeNameValueExpression);
        }
        else
        {
            MethodExpression methodExpression = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                    createMethodExpression(elContext,
                            attributeExpressionString, Void.TYPE,
                            VALUE_CHANGE_LISTENER_SIGNATURE), attributeNameValueExpression);


            MethodExpression methodExpression2 = reWrapMethodExpression(context.getApplication().getExpressionFactory().
                    createMethodExpression(elContext,
                            attributeExpressionString, Void.TYPE,
                            EMPTY_CLASS_ARRAY), attributeNameValueExpression);


            valueChangeListener = new MethodExpressionValueChangeListener(methodExpression, methodExpression2);

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     */
    private void _invokeViewRootAfterPhaseListener(FacesContext facesContext)
    {
        // get the UIViewRoot (note that it must not be null at this point)
        UIViewRoot root = facesContext.getViewRoot();
        MethodExpression afterPhaseExpression = root.getAfterPhaseListener();
        if (afterPhaseExpression != null)
        {
            PhaseEvent event = new PhaseEvent(facesContext, getPhase(), _getLifecycle(facesContext));
            try
            {
                afterPhaseExpression.invoke(facesContext.getELContext(), new Object[] { event });
            }
            catch (Throwable t) 
            {
                log.log(Level.SEVERE, "An Exception occured while processing " +
                        afterPhaseExpression.getExpressionString() + 
                        " in Phase " + getPhase(), t);
            }
        }
    }

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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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        }
        
        actx.beforeConstructELExpression();
        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.
            // NOTE that we have to check if the expression refers to cc.attrs for a MethodExpression

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        }
    }


    private void tryToProcessActionMethod(ActionSource2 commandComponent)
    {
        MethodExpression actionExpression = commandComponent.getActionExpression();


        if(actionExpression == null)
        {
            return;
        }


        ELHelper elHelper = ExtValUtils.getELHelper();
        String actionString = actionExpression.getExpressionString();
        if(!elHelper.isELTermWellFormed(actionString))
        {
            return;
        }

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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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