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 (params == null)
        {
            params = new Class[0];
        }


        MethodExpression methodExpression;


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

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        continue;
      }
    }  
    // Set filterMethod attribute
    if (_filterMethod != null) {
      MethodExpression mexpr = getFacesContext().getApplication()
          .getExpressionFactory().createMethodExpression(elContext,
              _filterMethod.getExpressionString(), Object.class,
              new Class[] { Object.class });
      ((HtmlColumn) component).setFilterMethod(mexpr);
    }

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                        @Override
                        public void applyMetadata(FaceletContext context, Object object) {
              FacesContext facesContext = context.getFacesContext();
              
              MethodExpression expression = facesContext.getApplication().getExpressionFactory().
                createMethodExpression(facesContext.getELContext(), attribute.getValue(), boolean.class, new Class[]{Object.class});
              ((UIComponent) object).getAttributes().put(FILTER_METHOD, expression);
            }
          };
        }

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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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  FacesContext context = getFacesContext();
  
  if (valueHolder != null) {
      String[] requestedValues = valueHolder.getRequestedValues();
      if (requestedValues != null) {
    MethodExpression suggestingAction = getSuggestionAction();
    if (suggestingAction != null) {
        int first = getFirst();
        int rows = getRows();
        int rowIndex = getRowIndex();
        Object value = getValue();


        setFirst(0);
        setRows(0);


        Map<String, Object> results = new HashMap<String, Object>();
        for (int i = 0; i < requestedValues.length; i++) {
      String requestedValue = requestedValues[i];
      if (requestedValue != null) {
          setValue(suggestingAction.invoke(
            context.getELContext(), new Object[]{requestedValue}));


          setRowIndex(-1);


          int j = 0;

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  public void setupValue(FacesContext context) {
        SubmittedValue valueHolder = (SubmittedValue) getSubmitedValue();
        Object submittedValue = valueHolder != null ? valueHolder.getSuggestionValue() : null;
        
    MethodExpression suggestingAction = getSuggestionAction();
    if (null != suggestingAction) {
        setValue(suggestingAction.invoke(
                context.getELContext(), new Object[]{submittedValue}));
    }
  }

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  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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        // Wrap custom expression factory
        ExpressionFactory wrappedExpressionFactory = getCurrentManager().wrapExpressionFactory(new DummyExpressionFactory());


        // Create method expression and invoke it with supplied EL context (porting package)
        MethodExpression methodExpression = wrappedExpressionFactory.createMethodExpression(null, "foo.test", String.class,
                null);
        Object methodElResult = methodExpression.invoke(getCurrentConfiguration().getEl().createELContext(getCurrentManager()),
                null);
        assertNotNull(methodElResult);
        assertTrue(methodElResult instanceof Integer);
        assertEquals(methodElResult, Integer.valueOf(-1));

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        continue;
      }
    }  
    // Set filterMethod attribute
    if (_filterMethod != null) {
      MethodExpression mexpr = getFacesContext().getApplication()
          .getExpressionFactory().createMethodExpression(elContext,
              _filterMethod.getExpressionString(), Object.class,
              new Class[] { Object.class });
      ((HtmlColumn) component).setFilterMethod(mexpr);
    }

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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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