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

                                 Object sourceValue,
                                 UIComponent target) {


                ValueExpression ve = (ValueExpression) sourceValue;
                ExpressionFactory f = ctx.getApplication().getExpressionFactory();
                MethodExpression me = f.createMethodExpression(ctx.getELContext(),
                                                               ve.getExpressionString(),
                                                               Void.TYPE,
                                                               ACTION_LISTENER_ARGS);
                MethodExpression noArg = f.createMethodExpression(ctx.getELContext(),
                                                                  ve.getExpressionString(),
                                                                  Void.TYPE,
                                                                  NO_ARGS);


                ((ActionSource2) target).addActionListener(

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                                 Object sourceValue,
                                 UIComponent target) {


                ValueExpression ve = (ValueExpression) sourceValue;
                ExpressionFactory f = ctx.getApplication().getExpressionFactory();
                MethodExpression me = f.createMethodExpression(ctx.getELContext(),
                                                               ve.getExpressionString(),
                                                               Void.TYPE,
                                                               VALIDATOR_ARGS);


                ((EditableValueHolder) target).addValidator(

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                                 Object sourceValue,
                                 UIComponent target) {


                ValueExpression ve = (ValueExpression) sourceValue;
                ExpressionFactory f = ctx.getApplication().getExpressionFactory();
                MethodExpression me = f.createMethodExpression(ctx.getELContext(),
                                                               ve.getExpressionString(),
                                                               Void.TYPE,
                                                               VALUE_CHANGE_LISTENER_ARGS);
                MethodExpression noArg = f.createMethodExpression(ctx.getELContext(),
                                                                  ve.getExpressionString(),
                                                                  Void.TYPE,
                                                                  NO_ARGS);


                ((EditableValueHolder) target).addValueChangeListener(

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    private void pushFlow(FacesContext context, Flow toPush, String lastDisplayedViewId) {
        FlowDeque<Flow> flowStack = getFlowStack(context);
        flowStack.addFirst(toPush, lastDisplayedViewId);
        FlowCDIContext.flowEntered();
        MethodExpression me  = toPush.getInitializer();
        if (null != me) {
            me.invoke(context.getELContext(), null);
        }
    }

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        return flowStack.pollFirst();
        
    }
    
    private void callFinalizer(FacesContext context, Flow currentFlow) {
        MethodExpression me  = currentFlow.getFinalizer();
        if (null != me) {
            me.invoke(context.getELContext(), null);
        }
        FlowCDIContext.flowExited();
    }

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            if (this.encoding != null) {
                String v = this.encoding.getValue(ctx);
                ctx.getFacesContext().getAttributes().put(RIConstants.FACELETS_ENCODING_KEY, v);
            }
            if (this.beforePhase != null) {
                MethodExpression m = this.beforePhase
                        .getMethodExpression(ctx, null, LISTENER_SIG);
                root.setBeforePhaseListener(m);
            }
            if (this.afterPhase != null) {
                MethodExpression m = this.afterPhase
                        .getMethodExpression(ctx, null, LISTENER_SIG);
                root.setAfterPhaseListener(m);
            }


            if (this.contracts != null) {

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    @Override
    public MethodExpression getMethodExpression(FaceletContext ctx,
                                                Class type,
                                                Class[] paramTypes) {


        MethodExpression result;


        try {
            ExpressionFactory f = ctx.getExpressionFactory();
            if (ELUtils.isCompositeComponentLookupWithArgs(this.value)) {
                String message =
                      MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                throw new TagAttributeException(this, message);
            }
            // Determine if this is a composite component attribute lookup.
            // If so, look for a MethodExpression under the attribute key
            if (ELUtils.isCompositeComponentMethodExprLookup(this.value)) {
                result = new AttributeLookupMethodExpression(getValueExpression(ctx, MethodExpression.class));
            } else if (ELUtils.isCompositeComponentExpr(this.value)) {
                MethodExpression delegate = new TagMethodExpression(this,
                                                 f.createMethodExpression(ctx,
                                                                          this.value,
                                                                          type,
                                                                          paramTypes));
                result = new ContextualCompositeMethodExpression(getLocation(), delegate);

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        public void applyMetadata(FaceletContext ctx, Object instance) {
            
            ExpressionFactory expressionFactory = ctx.getExpressionFactory();


            MethodExpression methodExpressionOneArg = attr.getMethodExpression(
                ctx, null, ActionSourceRule.ACTION_LISTENER_SIG);
            
            MethodExpression methodExpressionZeroArg = 
                    expressionFactory.createMethodExpression(
                        ctx, methodExpressionOneArg.getExpressionString(), 
                        Void.class, ActionSourceRule.ACTION_LISTENER_ZEROARG_SIG);            
            
            ((ActionSource2) instance)

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                }


                assert (null != expectedReturnType);
                assert (null != expectedParameters);


                MethodExpression me = f
                      .createMethodExpression(ctx.getELContext(),
                                              ve.getExpressionString(),
                                              expectedReturnType,
                                              expectedParameters);
                target.getAttributes().put(metadata.getName(),

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          Date submittedCurrentDate = convertCurrentDate(currentDateString);
          dateChangeEvent.setCurrentDate(submittedCurrentDate);


          if (!submittedCurrentDate.equals(currentDate)) {
            updateCurrentDate(facesContext, submittedCurrentDate);
            MethodExpression methodExpression = getCurrentDateChangeListener();
            if (methodExpression != null) {
                methodExpression.invoke(facesContext.getELContext(), new Object[] { dateChangeEvent });
            }
          }
          
        } catch (Exception e) {
          // XXX nick - kaa - add log.debug(...)

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