Examples of javax.el.ExpressionFactory.createValueExpression()

javax.el.ExpressionFactory.createValueExpression()
Parses an expression into a {@link ValueExpression} for later evaluation. Use this method forexpressions that refer to values. This method should perform syntactic validation of the expression. If in doing so it detects errors, it should raise an ELException. @param context The EL context used to parse the expression. The FunctionMapper and VariableMapper stored in the ELContext are used to resolve functions and variables found in the expression. They can be null, in which case functions or variables are not supported for this expression. The object returned must invoke the same functions and access the same variable mappings regardless of whether the mappings in the provided FunctionMapper and VariableMapper instances change between calling ExpressionFactory.createValueExpression() and any method on ValueExpression. Note that within the EL, the ${} and #{} syntaxes are treated identically. This includes the use of VariableMapper and FunctionMapper at expression creation time. Each is invoked if not null, independent of whether the #{} or ${} syntax is used for the expression. @param expression The expression to parse @param expectedType The type the result of the expression will be coerced to after evaluation. @return The parsed expression @throws ELException Thrown if there are syntactical errors in the provided expression. @throws NullPointerException if paramTypes is null.

                    }
                }, null),
                new FilterField(expressionFactory.createValueExpression(elContext, "#{var.lname != filterVar}", Object.class),
                    null, "b") };
        SortField[] sortFields = {
                new SortField(expressionFactory.createValueExpression(elContext, "#{var.fname}", Object.class), null,
                    SortOrder.ascending), new SortField(null, new Comparator<User>() {
                    public int compare(User o1, User o2) {
                        return o1.getLname().compareTo(o2.getLname());
                    }
                }, SortOrder.descending) };

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   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()));
   }


   public Class<?> getExpectedType(final FacesContext context, final String expression) throws ELException
   {

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   }


   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());
   }


   public Object getValue(final FacesContext context, final String expression) throws ELException
   {

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   }


   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());
   }


   public Object invokeMethod(final FacesContext context, final String expression) throws ELException
   {

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   }


   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())));
   }


   public ValueExpression createValueExpression(final FacesContext context, final String expression) throws ELException
   {

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   }


   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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    */
   private ValueExpression getValueExpression(FacesContext facesContext, String expression)
   {
      String el = toELExpression(expression);
      ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
      return expressionFactory.createValueExpression(facesContext.getELContext(), el, Object.class);
   }


   /**
    * Obtains the {@link FacesContext} using {@link FacesContext#getCurrentInstance()}. This method will throw an
    * {@link IllegalArgumentException} if the {@link FacesContext} is not available.

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         {
            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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        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);
        }

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            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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