Examples of javax.el.ELContext

javax.el.ELContext
Context information for expression evaluation. To evaluate an {@link Expression}, an ELContext must be provided. The ELContext holds:
- a reference to the base {@link ELResolver} that will be consulted to resolve model objectsand their properties
- a reference to {@link FunctionMapper} that will be used to resolve EL Functions.
- a reference to {@link VariableMapper} that will be used to resolve EL Variables.
- a collection of all the relevant context objects for use by ELResolvers
- state information during the evaluation of an expression, such as whether a property has been resolved yet
The collection of context objects is necessary because each ELResolver may need access to a different context object. For example, JSP and Faces resolvers need access to a javax.servlet.jsp.JspContext and a javax.faces.context.FacesContext, respectively. Creation of ELContext objects is controlled through the underlying technology. For example, in JSP the JspContext.getELContext() factory method is used. Some technologies provide the ability to add an {@link ELContextListener} so that applications and frameworks can ensure their own contextobjects are attached to any newly created ELContext. Because it stores state during expression evaluation, an ELContext object is not thread-safe. Care should be taken to never share an ELContext instance between two or more threads.

    }


    public Object evaluate(Exchange exchange) {
        // TODO we could use caching here but then we'd have possible concurrency issues
        // so lets assume that the provider caches
        ELContext context = populateContext(createContext(), exchange);
        ValueExpression valueExpression = getExpressionFactory().createValueExpression(context, expression, type);
        return valueExpression.getValue(context);
    }

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    if (name == null)
      throw new NullPointerException();


    if ((expression != null) && expression.isLiteralText())
    {
      ELContext context =
          FacesContext.getCurrentInstance().getELContext();
      getAttributes().put(name, expression.getValue(context));
    }
    else
    {

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        public void processAction(ActionEvent evt) throws AbortProcessingException
        {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            
            ELContext elContext = facesContext.getELContext();
            
            // Spec f:setPropertyActionListener: 
            
            // Call getValue() on the "value" ValueExpression.
            Object value = _value.getValue(elContext);

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                    else
                    {
                        //EL expression found. Evaluate it and pushback
                        //the result into the stream
                        FacesContext context = FacesContext.getCurrentInstance();
                        ELContext elContext = context.getELContext();
                        try
                        {
                            ValueExpression ve = context.getApplication().
                                getExpressionFactory().createValueExpression(
                                        elContext,

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        // That means somewhere we need to create a custom BeanInfo object for composite components
        // that will be filled somewhere (theorically in ViewDeclarationLanguage.getComponentMetadata())


        PropertyDescriptor[] propertyDescriptors = compositeComponentMetadata.getPropertyDescriptors();


        ELContext elContext = (ELContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);


        for (PropertyDescriptor propertyDescriptor : propertyDescriptors)
        {
            if (propertyDescriptor.getValue("type") != null)
            {

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        {
            BeanInfo compositeComponentMetadata = (BeanInfo) component.getAttributes().get(UIComponent.BEANINFO_KEY);


            PropertyDescriptor[] propertyDescriptors = compositeComponentMetadata.getPropertyDescriptors();


            ELContext elContext = (ELContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);


            for (PropertyDescriptor propertyDescriptor : propertyDescriptors)
            {
                if (propertyDescriptor.getValue("type") != null)
                {

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     * @return A ValueReferenceWrapper with the necessary information about the ValueReference.
     */
    private _ValueReferenceWrapper getValueReference(
            final ValueExpression valueExpression, final FacesContext context)
    {
        ELContext elCtx = context.getELContext();
        if (_ExternalSpecifications.isUnifiedELAvailable())
        {
            // unified el 2.2 is available --> we can use ValueExpression.getValueReference()
            // we can't access ValueExpression.getValueReference() directly here, because
            // Class loading would fail in applications with el-api versions prior to 2.2

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     * @return The ValueReferenceWrapper.
     */
    public static _ValueReferenceWrapper resolve(ValueExpression valueExpression, final ELContext elCtx)
    {
        _ValueReferenceResolver resolver = new _ValueReferenceResolver(elCtx.getELResolver());
        ELContext elCtxDecorator = new _ELContextDecorator(elCtx, resolver);
        
        valueExpression.getValue(elCtxDecorator);
        
        while (resolver.lastObject.getBase() instanceof CompositeComponentExpressionHolder)
        {

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        checkNull(componentExpression, "componentExpression");
        checkNull(facesContext, "facesContext");
        checkNull(componentType, "componentType");


        ELContext elContext = facesContext.getELContext();


        try
        {
            Object retVal = componentExpression.getValue(elContext);

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    @SuppressWarnings("unchecked")
    @Override
    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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