Examples of java.beans.FeatureDescriptor

java.beans.FeatureDescriptor
The FeatureDescriptor class is the common baseclass for PropertyDescriptor, EventSetDescriptor, and MethodDescriptor, etc.
It supports some common information that can be set and retrieved for any of the introspection descriptors.
In addition it provides an extension mechanism so that arbitrary attribute/value pairs can be associated with a design feature.

        @SuppressWarnings("unchecked")
        Iterator<FeatureDescriptor> result = resolver.getFeatureDescriptors(
                context, resourceBundle);


        while (result.hasNext()) {
            FeatureDescriptor featureDescriptor = result.next();
            Assert.assertEquals("key", featureDescriptor.getDisplayName());
            Assert.assertEquals("key", featureDescriptor.getName());
            Assert.assertEquals("", featureDescriptor.getShortDescription());
            Assert.assertFalse(featureDescriptor.isExpert());
            Assert.assertFalse(featureDescriptor.isHidden());
            Assert.assertTrue(featureDescriptor.isPreferred());
            Assert.assertEquals(String.class,
                    featureDescriptor.getValue(ELResolver.TYPE));
            Assert.assertEquals(Boolean.TRUE, featureDescriptor
                    .getValue(ELResolver.RESOLVABLE_AT_DESIGN_TIME));
        }
    }

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        map.put("key", "value");
        Iterator<FeatureDescriptor> result = mapELResolver
                .getFeatureDescriptors(context, map);


        while (result.hasNext()) {
            FeatureDescriptor featureDescriptor = result.next();
            Assert.assertEquals("key", featureDescriptor.getDisplayName());
            Assert.assertEquals("key", featureDescriptor.getName());
            Assert.assertEquals("", featureDescriptor.getShortDescription());
            Assert.assertFalse(featureDescriptor.isExpert());
            Assert.assertFalse(featureDescriptor.isHidden());
            Assert.assertTrue(featureDescriptor.isPreferred());
            Assert.assertEquals("key".getClass(),
                    featureDescriptor.getValue(ELResolver.TYPE));
            Assert.assertEquals(Boolean.TRUE, featureDescriptor
                    .getValue(ELResolver.RESOLVABLE_AT_DESIGN_TIME));
        }
    }

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        e = ctxt.getAttributeNamesInScope(PageContext.PAGE_SCOPE);
        while (e.hasMoreElements()) {
            name = e.nextElement();
            value = ctxt.getAttribute(name, PageContext.PAGE_SCOPE);
            FeatureDescriptor descriptor = new FeatureDescriptor();
            descriptor.setName(name);
            descriptor.setDisplayName(name);
            descriptor.setExpert(false);
            descriptor.setHidden(false);
            descriptor.setPreferred(true);
            descriptor.setShortDescription("page scoped attribute");
            descriptor.setValue("type", value.getClass());
            descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE);
            list.add(descriptor);
        }


        e = ctxt.getAttributeNamesInScope(PageContext.REQUEST_SCOPE);
        while (e.hasMoreElements()) {
            name = e.nextElement();
            value = ctxt.getAttribute(name, PageContext.REQUEST_SCOPE);
            FeatureDescriptor descriptor = new FeatureDescriptor();
            descriptor.setName(name);
            descriptor.setDisplayName(name);
            descriptor.setExpert(false);
            descriptor.setHidden(false);
            descriptor.setPreferred(true);
            descriptor.setShortDescription("request scope attribute");
            descriptor.setValue("type", value.getClass());
            descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE);
            list.add(descriptor);
        }


        if (ctxt.getSession() != null) {
            e = ctxt.getAttributeNamesInScope(PageContext.SESSION_SCOPE);
            while (e.hasMoreElements()) {
                name = e.nextElement();
                value = ctxt.getAttribute(name, PageContext.SESSION_SCOPE);
                FeatureDescriptor descriptor = new FeatureDescriptor();
                descriptor.setName(name);
                descriptor.setDisplayName(name);
                descriptor.setExpert(false);
                descriptor.setHidden(false);
                descriptor.setPreferred(true);
                descriptor.setShortDescription("session scoped attribute");
                descriptor.setValue("type", value.getClass());
                descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE);
                list.add(descriptor);
            }
        }


        e = ctxt.getAttributeNamesInScope(PageContext.APPLICATION_SCOPE);
        while (e.hasMoreElements()) {
            name = e.nextElement();
            value = ctxt.getAttribute(name, PageContext.APPLICATION_SCOPE);
            FeatureDescriptor descriptor = new FeatureDescriptor();
            descriptor.setName(name);
            descriptor.setDisplayName(name);
            descriptor.setExpert(false);
            descriptor.setHidden(false);
            descriptor.setPreferred(true);
            descriptor.setShortDescription("application scoped attribute");
            descriptor.setValue("type", value.getClass());
            descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE);
            list.add(descriptor);
        }
        return list.iterator();
    }

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    @Override
    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>(
                SCOPE_NAMES.length);
        FeatureDescriptor feat;
        for (int i = 0; i < SCOPE_NAMES.length; i++) {
            feat = new FeatureDescriptor();
            feat.setDisplayName(SCOPE_NAMES[i]);
            feat.setExpert(false);
            feat.setHidden(false);
            feat.setName(SCOPE_NAMES[i]);
            feat.setPreferred(true);
            feat.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
            feat.setValue(TYPE, String.class);
            feats.add(feat);
        }
        return feats.iterator();
    }

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    public @SuppressWarnings({ "unchecked", "rawtypes" }) Iterator getFeatureDescriptors(
            ELContext context, Object base) {
        if (base instanceof ResourceBundle) {
            List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>();
            Enumeration<String> e = ((ResourceBundle) base).getKeys();
            FeatureDescriptor feat;
            String key;
            while (e.hasMoreElements()) {
                key = e.nextElement();
                feat = new FeatureDescriptor();
                feat.setDisplayName(key);
                feat.setExpert(false);
                feat.setHidden(false);
                feat.setName(key);
                feat.setPreferred(true);
                feat.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
                feat.setValue(TYPE, String.class);
                feats.add(feat);
            }
            return feats.iterator();
        }
        return null;

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    @Override
    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        if (base instanceof List<?>) {
            FeatureDescriptor[] descs = new FeatureDescriptor[((List<?>) base).size()];
            for (int i = 0; i < descs.length; i++) {
                descs[i] = new FeatureDescriptor();
                descs[i].setDisplayName("["+i+"]");
                descs[i].setExpert(false);
                descs[i].setHidden(false);
                descs[i].setName(""+i);
                descs[i].setPreferred(true);

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        @Override
        public FeatureDescriptor next() {
            if (!hasNext())
                throw new NoSuchElementException();
            FeatureDescriptor result = this.next;
            this.next = null;
            return result;


        }

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    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        if (base instanceof Map<?, ?>) {
            Iterator<?> itr = ((Map<?, ?>) base).keySet().iterator();
            List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>();
            Object key;
            FeatureDescriptor desc;
            while (itr.hasNext()) {
                key = itr.next();
                desc = new FeatureDescriptor();
                desc.setDisplayName(key.toString());
                desc.setExpert(false);
                desc.setHidden(false);
                desc.setName(key.toString());
                desc.setPreferred(true);
                desc.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.FALSE);
                desc.setValue(TYPE, key.getClass());
                feats.add(desc);
            }
            return feats.iterator();
        }
        return null;

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    @Override
    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        if (base != null && base.getClass().isArray()) {
            FeatureDescriptor[] descs = new FeatureDescriptor[Array.getLength(base)];
            for (int i = 0; i < descs.length; i++) {
                descs[i] = new FeatureDescriptor();
                descs[i].setDisplayName("["+i+"]");
                descs[i].setExpert(false);
                descs[i].setHidden(false);
                descs[i].setName(""+i);
                descs[i].setPreferred(true);

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    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        if (base instanceof Map<?, ?>) {
            Iterator<?> itr = ((Map<?, ?>) base).keySet().iterator();
            List<FeatureDescriptor> feats = new ArrayList<FeatureDescriptor>();
            Object key;
            FeatureDescriptor desc;
            while (itr.hasNext()) {
                key = itr.next();
                desc = new FeatureDescriptor();
                desc.setDisplayName(key.toString());
                desc.setShortDescription("");
                desc.setExpert(false);
                desc.setHidden(false);
                desc.setName(key.toString());
                desc.setPreferred(true);
                desc.setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
                desc.setValue(TYPE, key.getClass());
                feats.add(desc);
            }
            return feats.iterator();
        }
        return null;

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