Part of ACTVT 93: The Share client exposes the diagram associated with a workflow

Added a getWorkflowImage(String workflowInstanceId) method to WorkflowService and WorkflowComponent interfaces. JBPM implementation will always return null, Activiti implementation will return an InputStream when diagramming information is available.

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@28264 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/workflow/jbpm/JBPMEngine.java

@@ -1288,6 +1288,17 @@ public class JBPMEngine extends AlfrescoBpmEngine implements WorkflowEngine
         }
     }
     
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.alfresco.repo.workflow.WorkflowComponent#getWorkflowImage(java.lang.String)
+     */
+    public InputStream getWorkflowImage(final String workflowInstanceId)
+    {
+        // we don't support workflow instance diagrams in JBPM so return null
+        return null;
+    }
+    
     //
     // Task Management ...
     //