Dave: Thanks for the compliment ("excellent example"). :)
Josh
--
Joshua Hansen
Up Bear Enterprises
(541) 760-7685
David Herbert wrote:
> Thanks for the help everyone.
>
> I have implemented the transformer to do the watermarking, thanks to
> Joshua's excellent example:
>
> public class WatermarkImageTransformer implements
> ImageContentTransformer {
>
> public Image transform(Image image, Map<String, String> attr)
> throws ContentManagerException {
> ... code for doing the watermark...
> }
>
> }
>
> I have modified my bean accordingly (relevant bits only):
>
> public class HistoricSitesPhotoData extends MetaData {
>
> ...
>
> private static final WatermarkImageTransformer WATERMARKER = new
> WatermarkImageTransformer();
>
> public void activateMetaData() {
>
> ... other constraints...
>
> addConstraint(new ConstrainedProperty("image")
> .notNull(true)
> .file(true)
> .listed(false)
> .mimeType(MimeType.IMAGE_JPEG)
> .contentAttribute("watermark", this.getPhotographer())
> .transformer(WATERMARKER));
>
> ...
>
> }
>
> Now I already have a CMF table "historicsitesphotodata" created and
> populated before I added the above constraint. If I've understood
> Content Transformers correctly, I think that my RIFE/CRUD app which adds
> images to the database would apply the above transformer to do a
> watermark prior to storing the image? I don't see this happening, in
> fact my transformer is never called when I add an image to the database
> this way. I am thinking I have to reinstall all my CMF tables and
> reenter all the data in order that CMF will recognise the transformer? I
> assume the above constraint maps onto something in the Postgres world
> which invokes the transformation.
>
> Is it possible to register the transformer with the "serve_content"
> element e.g.
>
> <element id="serve_content" file="rife/cmf/serve_content.xml"
> url="/content/*">
> <property name="datasource"><datasource><config
> param="DATASOURCE"/></datasource></property>
> <property name="transformer">... some reference somehow to the
> transformer class ...
> </property>
> </element>
>
> so that the watermarking gets done when the image is output?
>
> Thanks for any further help.
>
> David Herbert
> British Antarctic Survey
>
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> >
>
>
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