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

  if (this._filterMethod != null) {
    return this._filterMethod;
  }
  ValueExpression ve = getValueExpression("filterMethod");
  if (ve != null) {
      MethodExpression value = null;
      
      try {
      value = (MethodExpression) ve.getValue(getFacesContext().getELContext());
      } catch (ELException e) {
      throw new FacesException(e);

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this._accesskey = _accesskey;
}


@SuppressWarnings("deprecation")
public MethodBinding getAction(){
  MethodExpression expression = getActionExpression();
  if (expression instanceof org.richfaces.webapp.taglib.MethodExpressionMethodBindingAdaptor) {
    return ((org.richfaces.webapp.taglib.MethodExpressionMethodBindingAdaptor) expression).getBinding();
  } else if (expression != null) {
    return new org.richfaces.webapp.taglib.MethodBindingMethodExpressionAdaptor(expression);
  }

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  public void setTip(java.lang.String tip) {
    this.tip = tip;
  }


  public javax.faces.el.MethodBinding getSuggestMethod() {
    MethodExpression expression = getSuggestMethodExpression();
    if (expression instanceof MethodBindingToMethodExpression) {
      return ((MethodBindingToMethodExpression)expression).getMethodBinding();
    }
    if (expression != null) {
       return new MethodExpressionToMethodBinding(expression);

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  public void setDirectLinkCount(java.lang.Integer directLinkCount) {
    this.directLinkCount = directLinkCount;
  }


  public javax.faces.el.MethodBinding getSortActionListener() {
    MethodExpression expression = getSortActionListenerExpression();
    if (expression instanceof MethodBindingToMethodExpression) {
      return ((MethodBindingToMethodExpression)expression).getMethodBinding();
    }
    if (expression != null) {
       return new MethodExpressionToMethodBinding(expression);

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    final UISuggest suggest = (UISuggest) component;
    final TobagoResponseWriter writer = HtmlRendererUtils.getTobagoResponseWriter(facesContext);
    final String id  = suggest.getClientId(facesContext);
    final UIIn in = (UIIn) suggest.getParent();
    final MethodExpression suggestMethodExpression = suggest.getSuggestMethodExpression();
    final AutoSuggestItems items
        = createAutoSuggestItems(suggestMethodExpression.invoke(facesContext.getELContext(), new Object[]{in}));
    // todo: declare unused/unsupported stuff deprecated


    writer.startElement(HtmlElements.DIV, null);
    writer.writeClassAttribute(Classes.create(suggest));
    writer.writeIdAttribute(id);

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              break;
            }
          }
          if (expressionString != null) {
            ExpressionFactory expressionFactory = faceletContext.getExpressionFactory();
            MethodExpression action = new TagMethodExpression(value, expressionFactory.createMethodExpression(
                faceletContext, expressionString, String.class, ComponentUtils.ACTION_ARGS));
            ((ActionSource2) parent).setActionExpression(action);
          }
        } else if ("actionListener".equals(mode.getValue())) {
          String expressionString = value.getValue();
          while (isSimpleExpression(expressionString)) {
            if (isMethodOrValueExpression(expressionString)) {
              ValueExpression expression
                  = faceletContext.getVariableMapper().resolveVariable(removeElParenthesis(expressionString));
              if (expression == null) {
                if (LOG.isDebugEnabled()) {
                  // when the action hasn't been set while using a composition.
                  LOG.debug("Variable can't be resolved: value='" + expressionString + "'");
                }
                expressionString = null;
                break;
              } else {
                expressionString = expression.getExpressionString();
              }
            } else {
              LOG.warn("Only expressions are supported mode=actionListener value='" + expressionString + "'");
              expressionString = null;
              break;
            }
          }
          if (expressionString != null) {
            ExpressionFactory expressionFactory = faceletContext.getExpressionFactory();
            MethodExpression actionListener = new TagMethodExpression(value, expressionFactory.createMethodExpression(
                faceletContext, expressionString, null, ComponentUtils.ACTION_LISTENER_ARGS));
            ((ActionSource) parent).addActionListener(new MethodExpressionActionListener(actionListener));
          }
        } else if ("actionFromValue".equals(mode.getValue())) {
          if (!value.isLiteral()) {
            String result = value.getValue(faceletContext);
            parent.getAttributes().put(name.getValue(), new ConstantMethodBinding(result));
          }
        } else if ("valueIfSet".equals(mode.getValue())) {
          String expressionString = value.getValue();
          String lastExpressionString = null;
          while (isMethodOrValueExpression(expressionString) && isSimpleExpression(expressionString)) {
            ValueExpression expression
                = faceletContext.getVariableMapper().resolveVariable(removeElParenthesis(expressionString));
            if (expression != null) {
              lastExpressionString = expressionString;
              expressionString = expression.getExpressionString();
            } else {
              // restore last value
              expressionString = lastExpressionString;
              break;
            }
          }
          if (expressionString != null) {
            final String attributeName = name.getValue(faceletContext);
            if (containsMethodOrValueExpression(expressionString)) {
              ValueExpression expression = value.getValueExpression(faceletContext, Object.class);
              parent.setValueExpression(attributeName, expression);
            } else {
              final Object literalValue = getValue(faceletContext, parent, expressionString, attributeName);
              parent.getAttributes().put(attributeName, literalValue);
            }
          }
        } else {
          throw new FacesException("Type " + mode + " not supported");
        }
      } else {


        String nameValue = name.getValue(faceletContext);
        if (Attributes.RENDERED.equals(nameValue)) {
          if (value.isLiteral()) {
            parent.setRendered(value.getBoolean(faceletContext));
          } else {
            parent.setValueExpression(nameValue, value.getValueExpression(faceletContext, Boolean.class));
          }
        } else if (Attributes.RENDERED_PARTIALLY.equals(nameValue)
            && parent instanceof SupportsRenderedPartially) {


          if (value.isLiteral()) {
            String[] components = ComponentUtils.splitList(value.getValue());
            ((SupportsRenderedPartially) parent).setRenderedPartially(components);
          } else {
            parent.setValueExpression(nameValue, value.getValueExpression(faceletContext, Object.class));
          }
        } else if (Attributes.STYLE_CLASS.equals(nameValue)) {
          // TODO expression
          ComponentUtils.setStyleClasses(parent, value.getValue());
        } else if (Attributes.MARKUP.equals(nameValue)) {
          if (parent instanceof SupportsMarkup) {
            if (value.isLiteral()) {
              ((SupportsMarkup) parent).setMarkup(Markup.valueOf(value.getValue()));
            } else {
              ValueExpression expression = value.getValueExpression(faceletContext, Object.class);
              parent.setValueExpression(nameValue, expression);
            }
          } else {
            LOG.error("Component is not instanceof SupportsMarkup. Instance is: " + parent.getClass().getName());
          }
        } else if (parent instanceof EditableValueHolder && Attributes.VALIDATOR.equals(nameValue)) {
          MethodExpression methodExpression = getMethodExpression(faceletContext, null, ComponentUtils.VALIDATOR_ARGS);
          if (methodExpression != null) {
            ((EditableValueHolder) parent).addValidator(new MethodExpressionValidator(methodExpression));
          }
        } else if (parent instanceof EditableValueHolder
            && Attributes.VALUE_CHANGE_LISTENER.equals(nameValue)) {
          MethodExpression methodExpression =
              getMethodExpression(faceletContext, null, ComponentUtils.VALUE_CHANGE_LISTENER_ARGS);
          if (methodExpression != null) {
            ((EditableValueHolder) parent).addValueChangeListener(
                new MethodExpressionValueChangeListener(methodExpression));
          }
        } else if (parent instanceof ValueHolder && Attributes.CONVERTER.equals(nameValue)) {
          setConverter(faceletContext, parent, nameValue);
        } else if (parent instanceof ActionSource && Attributes.ACTION.equals(nameValue)) {
          MethodExpression action = getMethodExpression(faceletContext, String.class, ComponentUtils.ACTION_ARGS);
          if (action != null) {
            ((ActionSource2) parent).setActionExpression(action);
          }
        } else if (parent instanceof ActionSource && Attributes.ACTION_LISTENER.equals(nameValue)) {
          MethodExpression action = getMethodExpression(faceletContext, null, ComponentUtils.ACTION_LISTENER_ARGS);
          if (action != null) {
            ((ActionSource) parent).addActionListener(new MethodExpressionActionListener(action));
          }
        } else if (!parent.getAttributes().containsKey(nameValue)) {
          if (value.isLiteral()) {

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         facesContext.addMessage(null, facesMessage);
      }
      UIComponent source = event.getComponent();
      ActionSource2 actionSource = (ActionSource2) source;
      Application application = facesContext.getApplication();
      MethodExpression expression = actionSource.getActionExpression();
      // Retrieve the NavigationHandler instance..
      NavigationHandler navHandler = application.getNavigationHandler();
      // Invoke nav handling..
      String navBinding = (null != expression) ? expression.getExpressionString() : null;
      navHandler.handleNavigation(facesContext, navBinding, errorOutcome);
      // Trigger a switch to Render Response if needed
      facesContext.renderResponse();
    }
  }

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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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     * 
     * @deprecated Use getActionExpression() instead.
     */
    public MethodBinding getAction()
    {
        MethodExpression actionExpression = getActionExpression();
        if (actionExpression instanceof _MethodBindingToMethodExpression)
        {
            return ((_MethodBindingToMethodExpression) actionExpression)
                    .getMethodBinding();
        }

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                        }
                    }


                    String[] targetsArray = StringUtils.splitShortString(targets, ' ');
                    String attributeExpressionString = attributeNameValueExpression.getExpressionString();
                    MethodExpression methodExpression = null;
                    MethodExpression methodExpression2 = null;


                    //Check if the stored valueExpression is a ccRedirection, to handle it properly later.
                    boolean ccAttrMeRedirection =
                            attributeNameValueExpression instanceof LocationValueExpression &&
                                    CompositeComponentELUtils.isCompositeComponentAttrsMethodExpression(

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