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


    public void setValue(EvaluationContext ctx, Object value)
            throws ELException {
        Target t = getTarget(ctx);
        ctx.setPropertyResolved(false);
        ELResolver resolver = ctx.getELResolver();
        // coerce to the expected type
        Class<?> targetClass = resolver.getType(ctx, t.base, t.property);
        if (COERCE_TO_ZERO
                || !isAssignable(value, targetClass)) {
            value = ELSupport.coerceToType(value, targetClass);
        }
        resolver.setValue(ctx, t.base, t.property, value);
    }

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  public ObjectWrapperFactory(FacesContext context, final String var, SortOrder sortOrder) {
    
    this.context = context;
    
    Application application = context.getApplication();
    ELResolver resolver = application.getELResolver();
    ELContext elContext = context.getELContext();
    this.var = var;
    
    SortField[] sortFields = sortOrder.getFields();

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  public ObjectWrapperFactory(FacesContext context, final String var, List<? extends Field> sortOrder) {
    
    this.context = context;
    
    Application application = context.getApplication();
    ELResolver resolver = application.getELResolver();
    ELContext elContext = context.getELContext();
    this.var = var;
    
    expressions = new Expression[sortOrder.size()];

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    if (context == null) {
      throw new IllegalArgumentException("JspContext was null");
    }


    // create ELContext for JspContext
        final ELResolver r = this.createELResolver();
        ELContextImpl ctx;
        if (Constants.IS_SECURITY_ENABLED) {
            ctx = AccessController.doPrivileged(
                    new PrivilegedAction<ELContextImpl>() {
                        public ELContextImpl run() {

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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 {
                Object[] params = null;
                if (this.children[i] instanceof AstDotSuffix) {
                    params = ((AstDotSuffix) this.children[i]).getParameters(ctx);
                }
                if (params != null && params.length > 0) {
                    ctx.setPropertyResolved(false);
                    base = resolver.invoke(ctx, base, property, null, params);
                } else {
                    ctx.setPropertyResolved(false);
                    base = resolver.getValue(ctx, base, property);
                }
            }
            i++;
        }
        return base;

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    public void setValue(EvaluationContext ctx, Object value)
            throws ELException {
        Target t = getTarget(ctx);
        ctx.setPropertyResolved(false);
        ELResolver resolver = ctx.getELResolver();
        // coerce to the expected type
        Class<?> targetClass = resolver.getType(ctx, t.base, t.property);
        if (COERCE_TO_ZERO
                || !isAssignable(value, targetClass)) {
            value = ELSupport.coerceToType(value, targetClass);
        }
        resolver.setValue(ctx, t.base, t.property, value);
    }

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    /**
     * Factory method to create the EL context
     */
    protected ELContext createContext() {
        ELResolver resolver = new CompositeELResolver() {
            {
                //add(methodResolver);
                add(new ArrayELResolver(false));
                add(new ListELResolver(false));
                add(new MapELResolver(false));

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            propCount--;
        }
        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 suffix = null;
        ELResolver resolver = ctx.getELResolver();
        while (base != null && i < propCount) {
            suffix = this.children[i].getValue(ctx);
            if (i + 1 < propCount &&
                    (this.children[i+1] instanceof AstMethodParameters)) {
                AstMethodParameters mps =
                    (AstMethodParameters) this.children[i+1];
                // This is a method
                base = resolver.invoke(ctx, base, suffix, null,
                        mps.getParameters(ctx));
                i+=2;
            } else {
                // This is a property
                if (suffix == null) {
                    return null;
                }
                
                ctx.setPropertyResolved(false);
                base = resolver.getValue(ctx, base, suffix);
                i++;
            }
        }
        if (!ctx.isPropertyResolved()) {
            throw new PropertyNotFoundException(MessageFactory.get(

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