Examples of javax.el.ExpressionFactory

javax.el.ExpressionFactory
Parses a String into a {@link ValueExpression} or {@link MethodExpression} instance for laterevaluation. Classes that implement the EL expression language expose their functionality via this abstract class. There is no concrete implementation of this API available in this package. Technologies such as JavaServer Pages and JavaServer Faces provide access to an implementation via factory methods. The {@link #createValueExpression(ELContext,String,Class)} method is usedto parse expressions that evaluate to values (both l-values and r-values are supported). The {@link #createMethodExpression(ELContext,String,Class,Class[])} method is used to parseexpressions that evaluate to a reference to a method on an object. Unlike previous incarnations of this API, there is no way to parse and evaluate an expression in one single step. The expression needs to first be parsed, and then evaluated. Resolution of model objects is performed at evaluation time, via the {@link ELResolver} associated with the {@link ELContext} passed tothe ValueExpression or MethodExpression. The ELContext object also provides access to the {@link FunctionMapper} and {@link VariableMapper} to be used when parsing the expression. ELfunction and variable mapping is performed at parse-time, and the results are bound to the expression. Therefore, the {@link ELContext}, {@link FunctionMapper}, and {@link VariableMapper}are not stored for future use and do not have to be Serializable. The createValueExpression and createMethodExpression methods must be thread-safe. That is, multiple threads may call these methods on the same ExpressionFactory object simultaneously. Implementations should synchronize access if they depend on transient state. Implementations should not, however, assume that only one object of each ExpressionFactory type will be instantiated; global caching should therefore be static. The ExpressionFactory must be able to handle the following types of input for the expression parameter:
- Single expressions using the ${} delimiter (e.g. "${employee.lastName}").
- Single expressions using the #{} delimiter (e.g. "#{employee.lastName}").
- Literal text containing no ${} or #{} delimiters (e.g. "John Doe").
- Multiple expressions using the same delimiter (e.g.
- Mixed literal text and expressions using the same delimiter (e.g. "Name: ${employee.firstName} ${employee.lastName}").
The following types of input are illegal and must cause an {@link ELException} to be thrown:
- Multiple expressions using different delimiters (e.g. "${employee.firstName}#{employee.lastName}").
- Mixed literal text and expressions using different delimiters(e.g. "Name: ${employee.firstName} #{employee.lastName}").

    picker.getFacets().put(Facets.POPUP, popup);
    picker.onComponentPopulated(facesContext, parent);
    popup.setRendered(false);
    popup.onComponentPopulated(facesContext, picker);


    final ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
    final ELContext elContext = facesContext.getELContext();
    popup.setValueExpression(Attributes.LEFT, expressionFactory.createValueExpression(
        elContext, "#{tobagoContext.actionPosition.right.pixel + 5}", Object.class));
    popup.setValueExpression(Attributes.TOP, expressionFactory.createValueExpression(
        elContext, "#{tobagoContext.actionPosition.top.pixel}", Object.class));


    final UIBox box = (UIBox) CreateComponentUtils.createComponent(
        facesContext, UIBox.COMPONENT_TYPE, RendererTypes.BOX, "box");
    popup.getChildren().add(box);
    box.setValueExpression(Attributes.LABEL, expressionFactory.createValueExpression(
        elContext, "#{tobagoContext.resourceBundle.datePickerTitle}", String.class));
    final UIGridLayout layoutOfBox = (UIGridLayout) CreateComponentUtils.createComponent(
        facesContext, UIGridLayout.COMPONENT_TYPE, RendererTypes.GRID_LAYOUT, "layout");
    box.getFacets().put(Facets.LAYOUT, layoutOfBox);
    layoutOfBox.setRows("*;auto;auto");


    final UICalendar calendar = (UICalendar) CreateComponentUtils.createComponent(
        facesContext, UICalendar.COMPONENT_TYPE, RendererTypes.CALENDAR, "calendar");
    box.getChildren().add(calendar);


     // fixme: should work automatically from the layout manager
    final Measure width = getResourceManager().getThemeMeasure(facesContext, calendar, "minimumWidth");
    layoutOfBox.setColumns(width.serialize());


    // add time input
    final UIPanel timePanel = (UIPanel) CreateComponentUtils.createComponent(
        facesContext, UIPanel.COMPONENT_TYPE, RendererTypes.PANEL, "timePanel");
    box.getChildren().add(timePanel);
    final UIGridLayout layoutOfTime = (UIGridLayout) CreateComponentUtils.createComponent(
        facesContext, UIGridLayout.COMPONENT_TYPE, RendererTypes.GRID_LAYOUT, "timePanelLayout");
    timePanel.getFacets().put(Facets.LAYOUT, layoutOfTime);
    layoutOfTime.setColumns("1*;auto;1*");
    final UIPanel cell1 = (UIPanel) CreateComponentUtils.createComponent(
        facesContext, UIPanel.COMPONENT_TYPE, RendererTypes.PANEL, "cell1");
    cell1.onComponentPopulated(facesContext, parent);
    timePanel.getChildren().add(cell1);


    final UITime time = (UITime) CreateComponentUtils.createComponent(
        facesContext, UITime.COMPONENT_TYPE, RendererTypes.TIME, "time");
    timePanel.getChildren().add(time);


    final UIPanel cell2 = (UIPanel) CreateComponentUtils.createComponent(
        facesContext, UIPanel.COMPONENT_TYPE, RendererTypes.PANEL, "cell2");
    cell2.onComponentPopulated(facesContext, parent);
    timePanel.getChildren().add(cell2);


    timePanel.onComponentPopulated(facesContext, parent);




    final UIPanel buttonPanel = (UIPanel) CreateComponentUtils.createComponent(
        facesContext, UIPanel.COMPONENT_TYPE, RendererTypes.PANEL, "buttonPanel");
    final UIGridLayout layoutOfButtons = (UIGridLayout) CreateComponentUtils.createComponent(
        facesContext, UIGridLayout.COMPONENT_TYPE, RendererTypes.GRID_LAYOUT, "buttonPanelLayout");
    buttonPanel.setLayoutManager(layoutOfButtons);
    layoutOfButtons.setColumns("*;*");
    layoutOfButtons.setRows("auto");


    box.getChildren().add(buttonPanel);
    box.onComponentPopulated(facesContext, parent);


    final UIButton okButton = (UIButton) CreateComponentUtils.createComponent(
        facesContext, UIButton.COMPONENT_TYPE, RendererTypes.BUTTON, "ok");
    buttonPanel.getChildren().add(okButton);
    okButton.setValueExpression(Attributes.LABEL, expressionFactory.createValueExpression(
        elContext, "#{tobagoContext.resourceBundle.datePickerOk}", String.class));
    ComponentUtils.putDataAttributeWithPrefix(okButton, DataAttributes.DATE_PICKER_OK, true);
    okButton.getAttributes().put(Attributes.POPUP_CLOSE, "afterSubmit");
    okButton.setOmit(true);
    final UIButton cancelButton = (UIButton) CreateComponentUtils.createComponent(
        facesContext, UIButton.COMPONENT_TYPE, RendererTypes.BUTTON, "cancel");
    buttonPanel.getChildren().add(cancelButton);
    cancelButton.setValueExpression(Attributes.LABEL, expressionFactory.createValueExpression(
        elContext, "#{tobagoContext.resourceBundle.datePickerCancel}", String.class));
    cancelButton.getAttributes().put(Attributes.POPUP_CLOSE, "immediate");


    buttonPanel.onComponentPopulated(facesContext, parent);
  }

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            validateFunctions(el, n);


            // test it out
            ELContextImpl ctx = new ELContextImpl();
            ctx.setFunctionMapper(this.getFunctionMapper(el));
            ExpressionFactory ef = this.pageInfo.getExpressionFactory();
            try {
                ef.createValueExpression(ctx, expr, Object.class);
            } catch (ELException e) {


            }
        }

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    {
        assert _condition != null;


        if (_conditionExpression == null)
        {
            ExpressionFactory factory = context.getApplication().getExpressionFactory();
            _conditionExpression = factory.createValueExpression(context.getELContext(), _condition, Boolean.class);
        }


        return _conditionExpression;
    }

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    {
        assert _toViewId != null;


        if (_toViewIdExpression == null)
        {
            ExpressionFactory factory = context.getApplication().getExpressionFactory();
            _toViewIdExpression = factory.createValueExpression(context.getELContext(), _toViewId, String.class);
        }


        return _toViewIdExpression;
    }

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            } else {
              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()) {

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    // the expression can be empty
    // in this case return nothing
    if (value.getValue().startsWith("${")) {
      ValueExpression expression = getExpression(faceletContext);
      if (expression != null) {
        ExpressionFactory expressionFactory = faceletContext.getExpressionFactory();
        return new TagMethodExpression(value, expressionFactory.createMethodExpression(faceletContext,
            expression.getExpressionString(), returnType, args));
      } else {
        return null;
      }
    } else {

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      type = PropertyUtils.getReadMethod(
          new PropertyDescriptor(attributeName, parent.getClass())).getReturnType();
    } catch (IntrospectionException e) {
      LOG.warn("Can't determine expected type", e);
    }
    ExpressionFactory expressionFactory = faceletContext.getExpressionFactory();
    final ValueExpression valueExpression = expressionFactory
        .createValueExpression(faceletContext, expressionString, type);
    return valueExpression.getValue(faceletContext);
  }

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    return createValueExpression(string);
  }


  public static ValueExpression createValueExpression(String string) {
    FacesContext facesContext = FacesContext.getCurrentInstance();
    ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
    return expressionFactory.createValueExpression(facesContext.getELContext(), string, Object.class);
  }

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    public static Object proprietaryEvaluate(final String expression,
            final Class<?> expectedType, final PageContext pageContext,
            final ProtectedFunctionMapper functionMap, final boolean escape)
            throws ELException {
        Object retValue;
        final ExpressionFactory exprFactory = jspf.getJspApplicationContext(pageContext.getServletContext()).getExpressionFactory();
        if (SecurityUtil.isPackageProtectionEnabled()) {
            try {
                retValue = AccessController
                        .doPrivileged(new PrivilegedExceptionAction<Object>() {


                            @Override
                            public Object run() throws Exception {
                                ELContextImpl ctx = (ELContextImpl) pageContext.getELContext();
                                ctx.setFunctionMapper(new FunctionMapperImpl(functionMap));
                                ValueExpression ve = exprFactory.createValueExpression(ctx, expression, expectedType);
                                return ve.getValue(ctx);
                            }
                        });
            } catch (PrivilegedActionException ex) {
                Exception realEx = ex.getException();
                if (realEx instanceof ELException) {
                    throw (ELException) realEx;
                } else {
                    throw new ELException(realEx);
                }
            }
        } else {
            ELContextImpl ctx = (ELContextImpl) pageContext.getELContext();
            ctx.setFunctionMapper(new FunctionMapperImpl(functionMap));
            ValueExpression ve = exprFactory.createValueExpression(ctx, expression, expectedType);
            retValue = ve.getValue(ctx);
        }
        if (escape && retValue != null) {
            retValue = XmlEscape(retValue.toString());
        }

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    public final <T> T evaluateExpressionGet(final FacesContext context, final String expression,
                                             final Class<? extends T> expectedType) throws ELException
    {
        ELContext elContext = context.getELContext();


        ExpressionFactory factory = getExpressionFactory();


        return (T) factory.createValueExpression(elContext, expression, expectedType).getValue(elContext);
    }

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