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* @author Kohsuke Kawaguchi

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    public void attGroupDecl(XSAttGroupDecl xsAttGroupDecl) {

        // TODO

        throw new UnsupportedOperationException();

    }

    public void attributeDecl(XSAttributeDecl xsAttributeDecl) {

        // TODO

        throw new UnsupportedOperationException();

    }

    /**

     * Attribute use always becomes a property.

     */

    public void attributeUse(XSAttributeUse use) {

        boolean hasFixedValue = use.getFixedValue()!=null;

        BIProperty pc = BIProperty.getCustomization(use);

        // map to a constant property ?

        boolean toConstant = pc.isConstantProperty() && hasFixedValue;

        TypeUse attType = bindAttDecl(use.getDecl());

        CPropertyInfo prop = pc.createAttributeProperty( use, attType );

        if(toConstant) {

            prop.defaultValue = CDefaultValue.create(attType,use.getFixedValue());

            prop.realization = builder.fieldRendererFactory.getConst(prop.realization);

        } else

        if(!attType.isCollection() && (prop.baseType == null ? true : !prop.baseType.isPrimitive())) {

            // don't support a collection default value. That's difficult to do.

            // primitive types default value is problematic too - we can't check whether it has been set or no ( ==null) isn't possible TODO: emit a waring in these cases

            if(use.getDefaultValue()!=null) {

                // this attribute use has a default value.

                // the item type is guaranteed to be a leaf type... or TODO: is it really so?

                // don't support default values if it's a list

                prop.defaultValue = CDefaultValue.create(attType,use.getDefaultValue());

            } else

            if(use.getFixedValue()!=null) {

                prop.defaultValue = CDefaultValue.create(attType,use.getFixedValue());

            }

        } else if(prop.baseType != null && prop.baseType.isPrimitive()) {

            ErrorReporter errorReporter = Ring.get(ErrorReporter.class);

            errorReporter.warning(prop.getLocator(), Messages.WARN_DEFAULT_VALUE_PRIMITIVE_TYPE, prop.baseType.name());

        }

        getCurrentBean().addProperty(prop);

    }

    private TypeUse bindAttDecl(XSAttributeDecl decl) {

        SimpleTypeBuilder stb = Ring.get(SimpleTypeBuilder.class);

        stb.refererStack.push( decl );

        try {

            return stb.build(decl.getType());

        } finally {

            stb.refererStack.pop();

        }

    }

    public void complexType(XSComplexType ct) {

        CClass ctBean = selector.bindToType(ct,null,false);

        if(getCurrentBean()!=ctBean)

            // in some case complex type and element binds to the same class

            // don't make it has-a. Just make it is-a.

            getCurrentBean().setBaseClass(ctBean);

    }

    public void wildcard(XSWildcard xsWildcard) {

        // element wildcards are processed by particle binders,

        // so this one is for attribute wildcard.

        getCurrentBean().hasAttributeWildcard(true);

    }

    public void modelGroupDecl(XSModelGroupDecl xsModelGroupDecl) {

        // TODO

        throw new UnsupportedOperationException();

    }

    public void modelGroup(XSModelGroup xsModelGroup) {

        // TODO

        throw new UnsupportedOperationException();

    }

    public void elementDecl(XSElementDecl xsElementDecl) {

        // TODO

        throw new UnsupportedOperationException();

    }

    public void simpleType(XSSimpleType type) {

        createSimpleTypeProperty(type,"Value");

    }

    public void particle(XSParticle xsParticle) {

        // TODO

        throw new UnsupportedOperationException();

    }

    public void empty(XSContentType ct) {

        // empty generates nothing

    }

}