Examples of javax.servlet.jsp.el.VariableResolver

javax.servlet.jsp.el.VariableResolver

This class is used to customize the way an ExpressionEvaluator resolves variable references at evaluation time. For example, instances of this class can implement their own variable lookup mechanisms, or introduce the notion of "implicit variables" which override any other variables. An instance of this class should be passed when evaluating an expression.

An instance of this class includes the context against which resolution will happen
@since 2.0 @deprecated As of JSP 2.1, replaced by javax.el.ELResolver

    public Object eval(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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    public Boolean evalCond(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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    public Node evalLocation(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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    public void updateExpression(String expr, Object value, PageContext pageContext)
            throws ExpressionUpdateException, JspException
    {
        if (isExpression(expr)) {


            VariableResolver vr = ImplicitObjectUtil.getUpdateVariableResolver(pageContext.getRequest(), pageContext.getResponse(), false);
            ExpressionEvaluatorFactory.getInstance().update(expr, value, vr, false);
        }
        else {
            String s = Bundle.getString("Tags_BindingUpdateExpressionError", new Object[]{expr});
            _tag.registerTagError(s, null);

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            if(_logger.isWarnEnabled()) _logger.warn("An error occurred checking a request for multipart status.  No model values were updated.");
            return;
        }


        /* explicitly build a variable resolver that is used to provide objects that may be updated to the expression engine */
        VariableResolver variableResolver = ImplicitObjectUtil.getUpdateVariableResolver(form, request, response, true);


        /* todo: are there any ordering issues with using an Iterator vs. an Enumeration here? */
        Iterator iterator = params.keySet().iterator();
        while (iterator.hasNext())
        {

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        if (facesContext == null)
        {
            throw new NullPointerException("facesContext");
        }


        VariableResolver variableResolver =
            new ELVariableResolver(facesContext);
        Object expression = _expression;


        while (expression instanceof ConditionalExpression)
        {

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    public Object eval(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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    public Boolean evalCond(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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    public Node evalLocation(final Context ctx, final String expr)
    throws SCXMLExpressionException {
        if (expr == null) {
            return null;
        }
        VariableResolver vr = null;
        if (ctx instanceof VariableResolver) {
            vr = (VariableResolver) ctx;
        } else {
            vr = new ContextWrapper(ctx);
        }

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   * @param reader   The source XML reader.
   * @return The XML PI filter.
   */
  private PreprocessingFilter createPIHandler(EntityResolver resolver, XMLReader reader) {
    PreprocessingFilter filter = new PreprocessingFilter(reader);
    ProcessingInstructionHandler resolvingHandler = new ExpressionHandler(new VariableResolver() {


      public Object resolveVariable(String name) throws ELException {
        if ("date".equals(name)) {
          return DateFormat.getDateInstance(DateFormat.LONG).format(new Date());
        } else if ("project".equals(name)) {

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