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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