protected  void collectBeanInfo(Map<String, Object> map,
    List<FeatureDescriptor> list) 
{
        if (map == null || map.isEmpty()) {
            return;
        }
        for (Map.Entry< String, ? extends Object > entry : map.entrySet()) {
            FeatureDescriptor descriptor = new FeatureDescriptor();
            descriptor.setDisplayName(entry.getKey());
            descriptor.setExpert(false);
            descriptor.setHidden(false);
            descriptor.setName(entry.getKey());
            descriptor.setPreferred(true);
            descriptor.setShortDescription("");
            descriptor.setValue("type", String.class);
            descriptor.setValue("resolvableAtDesignTime", Boolean.FALSE);
            list.add(descriptor);
        }
}

Collects bean infos from a map's values and filling a list.

 protected Object findObjectByProperty(ELContext context,
    Object property) 
{
        Object retValue = null;
        TilesRequestContext request = (TilesRequestContext) context
                .getContext(TilesRequestContext.class);
        String prop = property.toString();
        retValue = getObject(request.getRequestScope(), prop);
        if (retValue == null) {
            retValue = getObject(request.getSessionScope(), prop);
            if (retValue == null) {
                TilesApplicationContext applicationContext = (TilesApplicationContext) context
                        .getContext(TilesApplicationContext.class);
                retValue = getObject(applicationContext.getApplicationScope(),
                        prop);
            }
        }
        return retValue;
}

Finds an object in request, session or application scope, in this order.

 public Class<?> getCommonPropertyType(ELContext context,
    Object base) 
{
        // only resolve at the root of the context
        if (base != null) {
            return null;
        }
        return String.class;
}

{@inheritDoc}

 public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context,
    Object base) 
{
        List< FeatureDescriptor > list = new ArrayList< FeatureDescriptor >();
        TilesRequestContext request = (TilesRequestContext) context
                .getContext(TilesRequestContext.class);
        collectBeanInfo(request.getRequestScope(), list);
        collectBeanInfo(request.getSessionScope(), list);
        TilesApplicationContext applicationContext = (TilesApplicationContext) context
                .getContext(TilesApplicationContext.class);
        collectBeanInfo(applicationContext.getApplicationScope(), list);
        return list.iterator();
}

{@inheritDoc}

 protected Object getObject(Map<String, Object> map,
    String property) 
{
        Object retValue = null;
        if (map != null) {
            retValue = map.get(property);
        }
        return retValue;
}

Returns an object from a map in a null-safe manner.

 public Class<?> getType(ELContext context,
    Object base,
    Object property) 
{
        if (base != null) {
            return null;
        }
        Object obj = findObjectByProperty(context, property);
        if (obj != null) {
            context.setPropertyResolved(true);
            return obj.getClass();
        }
        return null;
}

{@inheritDoc}

 public Object getValue(ELContext context,
    Object base,
    Object property) 
{
        if (base != null) {
            return null;
        }
        Object retValue = findObjectByProperty(context, property);
        if (retValue != null) {
            context.setPropertyResolved(true);
        }
        return retValue;
}

{@inheritDoc}

 public boolean isReadOnly(ELContext context,
    Object base,
    Object property) 
{
        if (context == null) {
            throw new NullPointerException();
        }
        return true;
}

{@inheritDoc}

 public  void setValue(ELContext context,
    Object base,
    Object property,
    Object value) 
{
        // Does nothing for the moment.
}

{@inheritDoc}