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


   @Override
   protected ELResolver[] getELResolvers()
   {
      ELResolver[] resolvers = new ELResolver[2];
      resolvers[0] = new ELResolver()
      {


         @Override
         public Class<?> getCommonPropertyType(ELContext arg0, Object arg1)
         {
            return null;
         }


         @Override
         public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext arg0, Object arg1)
         {
            return null;
         }


         @Override
         public Class<?> getType(ELContext arg0, Object base, Object property)
                  throws NullPointerException, PropertyNotFoundException, ELException
         {
            return null;
         }


         @Override
         public Object getValue(ELContext context, Object base, Object property)
                  throws NullPointerException, PropertyNotFoundException, ELException
         {
            if (SeamMockELResolverTest.property.equals(property))
            {
               context.setPropertyResolved(true);
               return "found";
            }
            return null;
         }


         @Override
         public boolean isReadOnly(ELContext arg0, Object base, Object property)
                  throws NullPointerException, PropertyNotFoundException, ELException
         {
            if (SeamMockELResolverTest.property.equals(property))
            {
               return false;
            }
            return false;
         }


         @Override
         public void setValue(ELContext context, Object base, Object property, Object value)
                  throws NullPointerException, PropertyNotFoundException,
                  PropertyNotWritableException, ELException
         {
            if (SeamMockELResolverTest.property.equals(property))
            {
               throw new PropertyNotWritableException();
            }
         }


      };
      resolvers[1] = new ELResolver() {


          @Override
          public Class<?> getCommonPropertyType(ELContext arg0, Object arg1)
          {
             return null;

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    if (hostNamePattern != null && ! key.equals("default")) {
      HashMap<String,Object> varMap = new HashMap<String,Object>();
      varMap.put("host", new HostRegexpVar(key));
      
      ELResolver resolver = new MapVariableResolver(varMap);


      ELContext env = new ConfigELContext(resolver);


      hostName = EL.evalString(hostNamePattern, env);
    }

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            return expression;
        }


        FacesContext fcontext = (FacesContext) context
                .getContext(FacesContext.class);
        ELResolver resolver = fcontext.getApplication().getELResolver();
        Object base = null;
        for (int i = 0; i < elements.length - 1; i++)
        {
            base = resolver.getValue(context, base, elements[i]);
        }


        try
        {
            Method method = base.getClass().getMethod(

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            return expression;
        }


        FacesContext fcontext = (FacesContext) context
                .getContext(FacesContext.class);
        ELResolver resolver = fcontext.getApplication().getELResolver();
        Object base = null;
        for (int i = 0; i < elements.length; i++)
        {
            base = resolver.getValue(context, base, elements[i]);
        }
        return fcontext.getApplication().getExpressionFactory().coerceToType(
                base, getExpectedType());


    }

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            return true;
        }


        FacesContext fcontext = (FacesContext) context
                .getContext(FacesContext.class);
        ELResolver resolver = fcontext.getApplication().getELResolver();
        Object base = null;
        for (int i = 0; i < elements.length - 1; i++)
        {
            base = resolver.getValue(context, base, elements[i]);
        }
        return resolver
                .isReadOnly(context, base, elements[elements.length - 1]);


    }

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            throw new NullPointerException();
        }


        FacesContext fcontext = (FacesContext) context
                .getContext(FacesContext.class);
        ELResolver resolver = fcontext.getApplication().getELResolver();
        Object base = null;
        for (int i = 0; i < elements.length - 1; i++)
        {
            base = resolver.getValue(context, base, elements[i]);
        }
        resolver.setValue(context, base, elements[elements.length - 1], value);


    }

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                JspApplicationContext applicationCtx = factory.getJspApplicationContext(standardContext.getServletContext());
                WebBeansContext context = appContext.getWebBeansContext();
                if (context != null && context.getBeanManagerImpl().isInUse()) {
                    // Registering ELResolver with JSP container
                    ELAdaptor elAdaptor = context.getService(ELAdaptor.class);
                    ELResolver resolver = elAdaptor.getOwbELResolver();
                    applicationCtx.addELResolver(resolver);
                }
            }
        }
    }

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            }
        });
        executorService.scheduleWithFixedDelay(new ConversationCleaner(context), delay, delay, TimeUnit.MILLISECONDS);


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


            JspFactory factory = JspFactory.getDefaultFactory();

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        Object property = null;
        int propCount = this.jjtGetNumChildren() - 1;
        int i = 1;


        // evaluate any properties before our target
        ELResolver resolver = ctx.getELResolver();
        if (propCount > 1) {
            while (base != null && i < propCount) {
                property = this.children[i].getValue(ctx);
                ctx.setPropertyResolved(false);
                base = resolver.getValue(ctx, base, property);
                i++;
            }
            // if we are in this block, we have more properties to resolve,
            // but our base was null
            if (base == null || property == null) {

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    public Object getValue(EvaluationContext ctx) throws ELException {
        Object base = this.children[0].getValue(ctx);
        int propCount = this.jjtGetNumChildren();
        int i = 1;
        Object property = null;
        ELResolver resolver = ctx.getELResolver();
        while (base != null && i < propCount) {
            property = this.children[i].getValue(ctx);
            if (property == null) {
                return null;
            } else {
                ctx.setPropertyResolved(false);
                base = resolver.getValue(ctx, base, property);
            }
            i++;
        }
        return base;
    }

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