auto register caps for META-INF/service

this is an experiment based on an idea mentioned in bndtools#6304

it leverages the recent addition of PR bndtools#5912 that allowed to add annotations in comments of files in META-INF/services. But in this PR we basically pretent and add a aQute.bnd.annotation.spi.ServiceProvider annotation artificially. this causes bnd to generate Provide-Capability manifest headers for the services

make sure biz.aQute.bndlib is on the buildpath which contains the 'aQute.bnd.annotation.spi.ServiceProvider' annotation

Signed-off-by: Christoph Rueger <[email protected]>

biz.aQute.bndlib/src/aQute/bnd/osgi/metainf/MetaInfService.java

@@ -228,7 +228,20 @@ public MetaInfService(String serviceName, String source) {
 				// just comment
 				continue;
 			}
-			implementations.put(line, new Implementation(line, annotations, comments));
+
+			// TODO: experimental: if there are no annotations present we just
+			// add one artificially to register the service in the manifest
+			// TODO should this be made configurable somehow?
+			if (annotations.isEmpty()) {
+				// this will create the capabilities for Service provider
+				// without any attributes e.g.
+				// Provide-Capability',
+				// "osgi.serviceloader;osgi.serviceloader=serviceName
+				annotations.add("aQute.bnd.annotation.spi.ServiceProvider", Attrs.EMPTY_ATTRS);
+				implementations.put(line, new Implementation(line, annotations, comments));
+			} else {
+				implementations.put(line, new Implementation(line, annotations, comments));
+			}
 			annotations.clear();
 			comments.clear();
 		}