[NOT A PR] Showcase manipulating Lyo objects via an interceptor

Author: berezovskyi

src/server-cm/src/main/java/co/oslc/refimpl/cm/gen/servlet/Application.java

@@ -151,6 +151,7 @@ public Set<Object> getSingletons() {
         // Start of user code Custom Resource Classes
         RESOURCE_CLASSES.add(OslcCorsFilter.class);
         RESOURCE_CLASSES.add(OslcCspFilter.class);
+        RESOURCE_CLASSES.add(ExtendedPropWriteInterceptor.class);
         // End of user code
 
         RESOURCE_SHAPE_PATH_TO_RESOURCE_CLASS_MAP.put(OslcConstants.PATH_ALLOWED_VALUES,           AllowedValues.class);

src/server-cm/src/main/java/co/oslc/refimpl/cm/gen/servlet/ExtendedPropWriteInterceptor.java

@@ -0,0 +1,32 @@
+package co.oslc.refimpl.cm.gen.servlet;
+
+import co.oslc.refimpl.cm.gen.CMConstants;
+import co.oslc.refimpl.cm.gen.auth.AuthenticationApplication;
+import org.eclipse.lyo.oslc4j.core.model.ServiceProviderCatalog;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.ext.Provider;
+import javax.ws.rs.ext.WriterInterceptor;
+import javax.ws.rs.ext.WriterInterceptorContext;
+import javax.xml.namespace.QName;
+import java.io.IOException;
+
+@Provider
+public class ExtendedPropWriteInterceptor implements WriterInterceptor {
+    private static final QName OAUTH_REALM_NAME = new QName("http://jazz.net/xmlns/prod/jazz/jfs/1.0/", "oauthRealmName");
+    private final Logger log = LoggerFactory.getLogger(ExtendedPropWriteInterceptor.class);
+
+    @Override
+    public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException {
+        log.info("Interceptor called");
+        final Object entity = context.getEntity();
+        if (entity instanceof ServiceProviderCatalog) {
+            final ServiceProviderCatalog catalog = (ServiceProviderCatalog) entity;
+            catalog.getExtendedProperties().put(OAUTH_REALM_NAME, AuthenticationApplication.OAUTH_REALM);
+            context.setEntity(catalog);
+        }
+        context.proceed();
+    }
+}