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

    private void notifyAfter(FacesContext context, Lifecycle lifecycle) {
        UIViewRoot viewRoot = context.getViewRoot();
        if (null == viewRoot) {
            return;
        }
        MethodExpression afterPhase = viewRoot.getAfterPhaseListener();
        if (null != afterPhase) {
            try {
                PhaseEvent event = new PhaseEvent(context, PhaseId.RESTORE_VIEW, lifecycle);
                afterPhase.invoke(context.getELContext(), new Object[]{event});
            }
            catch (Exception e) {
                if (LOGGER.isLoggable(Level.SEVERE)) {
                    LOGGER.log(Level.SEVERE,
                               "severe.component.unable_to_process_expression",
                               new Object[] { afterPhase.getExpressionString(),
                               ("afterPhase")});
                }
                return;
            }
        }

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                String expr = (sourceValue instanceof ValueExpression)
                                 ? ((ValueExpression) sourceValue).getExpressionString()
                                 : sourceValue.toString();
                ExpressionFactory f = ctx.getApplication().getExpressionFactory();
                MethodExpression me = f.createMethodExpression(ctx.getELContext(),
                                                               expr,
                                                               Object.class,
                                                               NO_ARGS);
                ((ActionSource2) target)
                      .setActionExpression(

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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,
                                                               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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                }


                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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            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);
            }


            String viewId = root.getViewId();

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//        Date modified = (Date) binding.getValue(elContext);
//        context.setDateHeader("Last-Modified",modified.getTime());
//      }
      // Send content
      OutputStream out = context.getOutputStream();
      MethodExpression send = (MethodExpression) UIComponentBase.restoreAttachedState(facesContext,data.createContent);
      send.invoke(elContext,new Object[]{out,data.value});
    }
  }

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   * @param phase
   * @param before
   */
  protected void processPhaseListeners(FacesContext context, PhaseId phase,
      boolean before) {
    MethodExpression listenerExpression = before ? getBeforePhaseListener()
        : getAfterPhaseListener();
    PhaseEvent event = null;
    if (null != listenerExpression) {
      event = createPhaseEvent(context, phase);
      listenerExpression.invoke(context.getELContext(),
          new Object[] { event });
    }
    if (null != this.phaseListeners) {
      for (PhaseListener listener : phaseListeners) {
        PhaseId phaseId = listener.getPhaseId();

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                String expr = (sourceValue instanceof ValueExpression)
                                 ? ((ValueExpression) sourceValue).getExpressionString()
                                 : sourceValue.toString();
                ExpressionFactory f = ctx.getApplication().getExpressionFactory();
                MethodExpression me = f.createMethodExpression(ctx.getELContext(),
                                                               expr,
                                                               Object.class,
                                                               NO_ARGS);
                ((ActionSource2) target)
                      .setActionExpression(

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