Examples of javax.el.CompositeELResolver

javax.el.CompositeELResolver
Maintains an ordered composite list of child ELResolvers. 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 a CompositeELResolver, to define rich semantics for evaluating an expression. For the {@link #getValue(ELContext,Object,Object)}, {@link #getType(ELContext,Object,Object)}, {@link #setValue(ELContext,Object,Object,Object)} and{@link #isReadOnly(ELContext,Object,Object)} methods, an ELResolver is not responsible forresolving 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 CompositeELResolver initializes the ELContext.propertyResolved flag to false, and uses it as a stop condition for iterating through its component resolvers. The ELContext.propertyResolved flag is not used for the design-time methods {@link #getFeatureDescriptors(ELContext,Object)} and{@link #getCommonPropertyType(ELContext,Object)}. Instead, results are collected and combined from all child ELResolvers for these methods.

  private ELContext context;


  public ELEngine() {
    factory = ExpressionFactory.newInstance();


    resolver = new CompositeELResolver();
    resolver.add(new ArrayELResolver());
    resolver.add(new ListELResolver());
    resolver.add(new MapELResolver());
    resolver.add(new BeanELResolver());
  }

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public class EL {
  public static final ExpressionFactory EXPRESSION_FACTORY = new ExpressionFactoryImpl();


  private static ELResolver createELResolver(Object base) {
    CompositeELResolver resolver = new CompositeELResolver();
    if(base != null)
      resolver.add(new BaseELResolver(base));
    resolver.add(new MapELResolver());
    resolver.add(new ListELResolver());
    resolver.add(new ArrayELResolver());
    resolver.add(new ResourceBundleELResolver());
    resolver.add(new BeanELResolver());
    return resolver;
  }

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        if (resolver == null)
        {


            // Configure a default ELResolver per Section 5.6.2 of JSF 1.2
            CompositeELResolver composite = new CompositeELResolver();


            composite.add(new FacesImplicitObjectELResolver());


            CompositeELResolver nested = new CompositeELResolver();
            // FIXME - nested.add() "ELResolvers from application configuration resources"
            nested.add(new FacesVariableResolverChainWrapper());
            nested.add(new FacesPropertyResolverChainWrapper());
            Iterator items = resolvers.iterator();
            while (items.hasNext())
            {
                nested.add((ELResolver) items.next());
            }
            composite.add(nested);


            // composite.add(new faces.ManagedBeanELResolver()); // FIXME
            composite.add(new ResourceBundleELResolver());

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        });
    }
    
    private static ELContext createELContext(VariableResolver resolver, FunctionMapper functionMapper)
    {
        CompositeELResolver composite = new CompositeELResolver();
        composite.add(EL.EL_RESOLVER);
        composite.add( new JbpmELResolver(resolver) );
        return EL.createELContext(composite, decorateFunctionMapper(functionMapper));
    }

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    private VariableMapper createVariableMapper() {
        return new VariableMapperImpl();
    }


    private ELResolver createELResolver() {
        CompositeELResolver result = new CompositeELResolver();


        result.add(new SkinPropertiesELResolver());
        result.add(new ResourceELResolver());


        return result;
    }

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        return elResolver;
    }


    private ELResolver createFacesResolver()
    {
        final CompositeELResolver resolver = new FacesCompositeELResolver(Scope.Faces);
        getResolverBuilderForFaces().build(resolver);
        return resolver;
    }

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    @Produces
    @Composite
    public ELResolver getELResolver(@Resolver Instance<ELResolver> resolvers, BeanManager beanManager) {


        // Create the default el resolvers
        CompositeELResolver compositeResolver = new CompositeELResolver();
        compositeResolver.add(beanManager.getELResolver());
        compositeResolver.add(new MapELResolver());
        compositeResolver.add(new ListELResolver());
        compositeResolver.add(new ArrayELResolver());
        compositeResolver.add(new ResourceBundleELResolver());
        compositeResolver.add(new BeanELResolver());


        boolean isGlassFish = System.getProperty("glassfish.version") != null;
        if (isGlassFish) {
            for (ELResolver resolver : getReferences(beanManager, ELResolver.class, new ResolverLiteral())) {
                compositeResolver.add(resolver);
            }
        } else {
            for (ELResolver resolver : resolvers) {
                compositeResolver.add(resolver);
            }
        }


        return compositeResolver;
    }

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        return elResolver;
    }


    private ELResolver createFacesResolver()
    {
        final CompositeELResolver resolver = new FacesCompositeELResolver(Scope.Faces);
        getResolverBuilderForFaces().build(resolver);
        return resolver;
    }

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        if (efFactory instanceof TilesApplicationContextAware) {
            ((TilesApplicationContextAware) efFactory)
                    .setApplicationContext(applicationContext);
        }
        expressionFactory = efFactory.getExpressionFactory();
        resolver = new CompositeELResolver() {
            {
                add(new TilesContextELResolver());
                add(new TilesContextBeanELResolver());
                add(new ArrayELResolver(false));
                add(new ListELResolver(false));

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        return elResolver;
    }


    private ELResolver createFacesResolver()
    {
        final CompositeELResolver resolver = new FacesCompositeELResolver(Scope.Faces);
        getResolverBuilderForFaces().build(resolver);
        return resolver;
    }

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