Examples of javax.el.ELResolver

javax.el.ELResolver
Enables customization of variable, property and method call resolution behavior for EL expression evaluation.
While evaluating an expression, the ELResolver associated with the {@link ELContext} is consulted to do the initial resolution of the first variable of an expression. It is also consulted when a . or [] operator is encountered.
For example, in the EL expression ${employee.lastName}, the ELResolver determines what object employee refers to, and what it means to get the lastName property on that object.

Most methods in this class accept a base and property parameter. In the case of variable resolution (e.g. determining what employee refers to in ${employee.lastName}), the base parameter will be null and the property parameter will always be of type String. In this case, if the property is not a String, the behavior of the ELResolver is undefined.

In the case of property resolution, the base parameter identifies the base object and the property object identifies the property on that base. For example, in the expression ${employee.lastName}, base is the result of the variable resolution for employee and property is the string "lastName". In the expression ${y[x]}, base is the result of the variable resolution for y and property is the result of the variable resolution for x.

In the case of method call resolution, the base parameter indentifies the base object and the method parameter identifies a method on that base. In the case of overloaded methods, the paramTypes parameter can be optionally used to identify a method. The paramsparameter are the parameters for the method call, and can also be used for resolving overloaded methods when the paramTypes parameter is not specified.
Though only a single ELResolver is associated with an ELContext, there are usually multiple resolvers considered for any given variable or property resolution. ELResolvers are combined together using {@link CompositeELResolver}s, to define rich semantics for evaluating an expression.

For the {@link #getValue}, {@link #getType}, {@link #setValue} and{@link #isReadOnly} methods, an ELResolver is notresponsible for resolving all possible (base, property) pairs. In fact, most resolvers will only handle a base of a single type. To indicate that a resolver has successfully resolved a particular (base, property) pair, it must set the propertyResolved property of the ELContext to true. If it could not handle the given pair, it must leave this property alone. The caller must ignore the return value of the method if propertyResolved is false.

The {@link #getFeatureDescriptors} and {@link #getCommonPropertyType}methods are primarily designed for design-time tool support, but must handle invocation at runtime as well. The {@link java.beans.Beans#isDesignTime} method can be used to determine if the resolver is being consulted at design-time or runtime.
@see CompositeELResolver @see ELContext#getELResolver @since JSP 2.1

      Object data = _model.getRowData();
      try
      {
        //TODO clean up that _getELXyz() calls
        FacesContext context = FacesContext.getCurrentInstance();
        ELResolver resolver = _getELResolver(context);
        ELContext elContext = _getELContext(context, resolver);
        Object propertyValue = evaluateProperty(resolver, elContext, data, property);
        // when the value is null, we don't know if we can sort it.
        // by default let's support sorting of null values, and let the user
        // turn off sorting if necessary:

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    _model.setRowIndex(0);
    // Make sure the model has that row 0! (It could be empty.)
    if (_model.isRowAvailable())
    {
      FacesContext context = FacesContext.getCurrentInstance();
      ELResolver resolver = _getELResolver(context);
      ELContext elContext = _getELContext(context, resolver);
      Comparator<Integer> comp =
        new Comp(resolver, elContext, property);
      if (!isAscending)
        comp = new Inverter<Integer>(comp);

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  }


  static Object __resolveProperty(Object object, String propertyName)
  {
    FacesContext context = FacesContext.getCurrentInstance();
    ELResolver resolver = _getELResolver(context);
    ELContext elContext = _getELContext(context, resolver);
    return resolver.getValue(elContext, object, propertyName);
  }

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    if (node == null)
      return null;


    FacesContext context = FacesContext.getCurrentInstance();
    ELContext elContext  = context.getELContext();
    ELResolver resolver  = elContext.getELResolver();
    String value         = null;


    try
    {
      Map<String, String> propMap =
        (Map<String, String>) resolver.getValue(elContext,
                                                node, _CUSTOM_ATTR_LIST);


      // Need to check to see if propMap is null.  If there are
      // no custom properties for this itemNode, there will be
      // no propMap.  See MenuContentHandler._createItemNode().

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  private static class TestELContextFactory implements ELContextFactory {
    public ELContext getELContext(final Object target) {
      return new ELContext() {
        public ELResolver getELResolver() {
          return new ELResolver() {
            public Class getCommonPropertyType(ELContext arg0, Object arg1) {
              return Object.class;
            }


            public Iterator getFeatureDescriptors(ELContext arg0, Object arg1) {

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      customResolvers.add(new FlowResourceELResolver(context));
      customResolvers.add(new ImplicitFlowVariableELResolver(context));
      customResolvers.add(new ScopeSearchingELResolver(context));
      customResolvers.add(new SpringBeanWebFlowELResolver(context));
      customResolvers.add(new ActionMethodELResolver());
      ELResolver resolver = new DefaultELResolver(customResolvers);
      return new WebFlowELContext(resolver);
    }

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    // create our factory which uses our customized builder
    ExpressionFactory f = new ExpressionFactoryImpl(new TreeStore(builder, new Cache(10)));


    // create our resolver
    ELResolver resolver = new MethodResolver(method);


    // create our context
    ELContext context = new SimpleContext(resolver);


    // let's go...

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        ELAttributeEvaluator evaluator = new ELAttributeEvaluator();
        evaluator.setApplicationContext(applicationContext);
        MultiversionExpressionFactoryFactory efFactory = new MultiversionExpressionFactoryFactory();
        efFactory.setApplicationContext(applicationContext);
        evaluator.setExpressionFactory(efFactory.getExpressionFactory());
        ELResolver elResolver = new CompositeELResolver() {
            {
                add(new TilesContextELResolver());
                add(new TilesContextBeanELResolver());
                add(new ArrayELResolver(false));
                add(new ListELResolver(false));

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        service = Executors.newScheduledThreadPool(1);
        service.scheduleWithFixedDelay(new ConversationCleaner(), delay, delay, TimeUnit.MILLISECONDS);


        ELAdaptor elAdaptor = ServiceLoader.getService(ELAdaptor.class);
        ELResolver resolver = elAdaptor.getOwbELResolver();
        //Application is configured as JSP
        if(OpenWebBeansConfiguration.getInstance().isJspApplication())
        {
            logger.debug("Application is configured as JSP. Adding EL Resolver.");

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  private void configureResolvers(List customResolvers) {
    if (customResolvers != null) {
      Iterator i = customResolvers.iterator();
      while (i.hasNext()) {
        ELResolver resolver = (ELResolver) i.next();
        add(resolver);
      }
    }
    add(new MapAdaptableELResolver());
    add(new ArrayELResolver());

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