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.


  private void handleBody()
    throws JspException, ServletException, IOException, ELException
  {
    PageContextImpl pageContext = (PageContextImpl) this.pageContext;
    ELContext env = pageContext.getELContext();
    
    String url = _urlExpr.evalString(env);


    if (url == null || url.equals(""))
      throw new JspTagException(L.l("URL may not be null for `{0}'",

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  private void handleExternalBody(String url)
    throws JspException, ServletException, IOException, ELException
  {
    PageContextImpl pageContext = (PageContextImpl) this.pageContext;
    ELContext env = pageContext.getELContext();
    
    URL netURL = new URL(url);


    URLConnection conn = netURL.openConnection();

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  public String initRegexp(WebApp webApp,
                           ServletMapper mapper,
                    ArrayList<String> vars)
    throws ServletException
  {
    ELContext env = EL.getEnvironment();
    
    HashMap<String,Object> map = new HashMap<String,Object>();
    map.put("regexp", vars);


    ELContext mapEnv = new ConfigELContext(new MapVariableResolver(map));


    String rawName = _servletName;
    String rawClassName = _servletClassName;


    if (rawName == null)

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    DateTimeConverter converter = null;


    String id = "javax.faces.DateTime";


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      converter = (DateTimeConverter) _bindingExpr.getValue(elContext);


    if (converter == null) {

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    Application app = context.getApplication();


    LongRangeValidator validator = null;


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      validator = (LongRangeValidator) _bindingExpr.getValue(elContext);


    if (validator == null) {

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    NumberConverter converter = null;


    String id = "javax.faces.Number";


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      converter = (NumberConverter) _bindingExpr.getValue(elContext);


    if (converter == null) {

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    Application app = context.getApplication();


    DoubleRangeValidator validator = null;


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      validator = (DoubleRangeValidator) _bindingExpr.getValue(elContext);


    if (validator == null) {

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    Application app = context.getApplication();


    Converter converter = null;


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      converter = (Converter) _bindingExpr.getValue(elContext);


    if (converter == null) {

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    Application app = context.getApplication();


    LengthValidator validator = null;


    ELContext elContext = context.getELContext();
      
    if (_bindingExpr != null)
      validator = (LengthValidator) _bindingExpr.getValue(elContext);


    if (validator == null) {

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  String initRegexpName(ArrayList<String> vars)
  {
    HashMap<String,Object> map = new HashMap<String,Object>();
    map.put("regexp", vars);


    ELContext mapEnv = new ConfigELContext(new MapVariableResolver(map));


    String rawName = getServletName();
    String rawClassName = getServletClassName();


    if (rawName == null)

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