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}").

    */
   public static final Pattern elPattern = Pattern.compile(EL_REGEX);


   public Object coerceToType(final FacesContext context, final String expression, final Object value) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
      return ef.coerceToType(value, ve.getType(context.getELContext()));
   }

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      return ef.coerceToType(value, ve.getType(context.getELContext()));
   }


   public Class<?> getExpectedType(final FacesContext context, final String expression) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
      return ve.getType(context.getELContext());
   }

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      return ve.getType(context.getELContext());
   }


   public Object getValue(final FacesContext context, final String expression) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
      return ve.getValue(context.getELContext());
   }

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   }


   public Object invokeMethod(final FacesContext context, final String expression, Class<?>[] argumentTypes,
         Object[] argumentValues) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      MethodExpression me = ef.createMethodExpression(context.getELContext(), expression, Object.class, argumentTypes);
      return me.invoke(context.getELContext(), argumentValues);
   }

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      return elPattern.matcher(viewId).matches();
   }


   public void setValue(final FacesContext context, final String expression, final Object value) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
      ve.setValue(context.getELContext(), ef.coerceToType(value, ve.getType(context.getELContext())));
   }

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      ve.setValue(context.getELContext(), ef.coerceToType(value, ve.getType(context.getELContext())));
   }


   public ValueExpression createValueExpression(final FacesContext context, final String expression) throws ELException
   {
      ExpressionFactory ef = context.getApplication().getExpressionFactory();
      ValueExpression ve = ef.createValueExpression(context.getELContext(), expression, Object.class);
      return ve;
   }

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   public Object evaluateMethodExpression(String expression, Object... values) throws UnsupportedOperationException
   {
      String el = toELExpression(expression);
      FacesContext facesContext = getFacesContext();
      ELContext elContext = facesContext.getELContext();
      ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
      MethodExpression methodExpression = expressionFactory.createMethodExpression(elContext, el,
               Object.class, new Class[values.length]);
      return methodExpression.invoke(elContext, values);
   }

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    * Creates an {@link ValueExpression} for the supplied EL expression
    */
   private ValueExpression getValueExpression(FacesContext facesContext, String expression)
   {
      String el = toELExpression(expression);
      ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
      return expressionFactory.createValueExpression(facesContext.getELContext(), el, Object.class);
   }

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         if (Expressions.isEL(attribute))
         {
            FacesContext context = FacesContext.getCurrentInstance();
            Application app = context.getApplication();


            ExpressionFactory expressionFactory = app.getExpressionFactory();
            ValueExpression ve = expressionFactory.createValueExpression(attribute, Object.class);
            component.setValueExpression(attributeName, ve);
         }
         else
         {
            component.getAttributes().put(attributeName, attribute);

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    @Test
    public void testCreateExtendedDataModel() {
        Assert.assertFalse(table.createExtendedDataModel() instanceof Arrangeable);
        List<Object> sortPriority = Arrays.<Object>asList("id2", "id0", "id1");
        List<UIComponent> children = table.getChildren();
        ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
        ELContext elContext = facesContext.getELContext();
        UIColumn column = new UIColumn();
        column.setRendered(false);
        children.add(column);
        for (int i = 0; i < sortPriority.size(); i++) {
            UIColumn child = new UIColumn();
            child.setId("id" + i);
            child.setValueExpression("filterExpression",
                expressionFactory.createValueExpression(elContext, "#{'id" + i + "'}", Object.class));
            child.setValueExpression("sortBy",
                expressionFactory.createValueExpression(elContext, "#{'id" + i + "'}", Object.class));
            child.setSortOrder(SortOrder.ascending);
            children.add(child);
        }
        Assert.assertTrue(table.createExtendedDataModel() instanceof Arrangeable);
        MockArrangeableModel model = new MockArrangeableModel();

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