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.

      }
      
      if (valueExpression!=null)
      {
         //TODO: note that this code is duplicated from ModelValidator!!
         ELContext elContext = facesContext.getELContext();
         InvalidValue[] invalidValues;
         try
         {
            invalidValues = Validators.instance().validate( valueExpression.toUnifiedValueExpression(), elContext, value );
         }

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        return FacesContext.getCurrentInstance();
    }


    public void setLiteralValue(String name, ValueExpression expression) {
        assert (expression.isLiteralText());
        ELContext context = getFacesContext().getELContext();


        try {
            setLiteralAttribute(name, expression.getValue(context));
        } catch (ELException elem) {
            throw new FacesException(elem);

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        return converter;
    }


    public void processAction(ActionEvent actionEvent) throws AbortProcessingException {
        FacesContext context = getFacesContext();
        ELContext elContext = context.getELContext();
        ValueExpression updateBinding = getAssignToExpression();


        if (updateBinding != null && (!updateBinding.isReadOnly(elContext))) {
            String requestValue = context.getExternalContext().getRequestParameterMap().get(getName());

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     */
    private static final String[] SKINS_PATHS = { DEFAULT_SKIN_PATH, USER_SKIN_PATH };
    private ConcurrentMap<String, FutureTask<Skin>> skins = new ConcurrentHashMap<String, FutureTask<Skin>>();


    protected void processProperties(FacesContext context, Map<Object, Object> properties) {
        ELContext elContext = context.getELContext();


        // replace all EL-expressions by prepared ValueBinding ?
        Application app = context.getApplication();


        for (Entry<Object, Object> entry : properties.entrySet()) {

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    }


    private String evaluateExpression(String expression) {
        if (isExpression(expression)) {
            FacesContext facesContext = FacesContext.getCurrentInstance();
            ELContext elContext = facesContext.getELContext();
            Object evaluated = ELUtils.evaluateValueExpression(ELUtils.createValueExpression(expression), elContext);
            if (evaluated == null) {
                throw new NullPointerException("expression '" + expression + "' was evaluated to null");
            }
            return evaluated.toString();

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    public FacesContextImpl() {
        setCurrentInstance(this);
    }


    private ELContext createELContext() {
        ELContext result = new ELContextImpl();
        result.putContext(FacesContext.class, this);
        return result;
    }

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        super.setUp();
        setupFacesRequest();
        extendedDataModel = new SequenceDataModel<User>(new ArrayDataModel<User>(users));
        arrangeableModel = new ArrangeableModel(extendedDataModel, "var", "filterVar");
        ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
        ELContext elContext = facesContext.getELContext();
        FilterField[] filterFields = {
                new FilterField(null, new Filter<User>() {
                    public boolean accept(User t) {
                        return t.getFname().indexOf('a') == -1;
                    }

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    protected MethodExpressionEventListener(MethodExpression methodExpressionOneArg) {


        super();
        this.methodExpressionOneArg = methodExpressionOneArg;
        FacesContext context = FacesContext.getCurrentInstance();
        ELContext elContext = context.getELContext();
        this.methodExpressionZeroArg = context
            .getApplication()
            .getExpressionFactory()
            .createMethodExpression(elContext, methodExpressionOneArg.getExpressionString(), Void.class,
                EVENT_LISTENER_ZERO_ARG_SIG);

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        if (event == null) {
            throw new NullPointerException();
        }
        FacesContext context = FacesContext.getCurrentInstance();
        ELContext elContext = context.getELContext();
        // PENDING: The corresponding code in MethodExpressionActionListener
        // has an elaborate message capture, logging, and rethrowing block.
        // Why not here?
        try {
            methodExpressionOneArg.invoke(elContext, new Object[] { event });

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


        final ELContext elContext = facesContext.getELContext();


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

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