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/WorkflowComponent.java

@@ -247,6 +247,15 @@ public interface WorkflowComponent
      * @return  the list of active timers
      */
     public List<WorkflowTimer> getTimers(String workflowId);
+    
+    /**
+     * Gets a graphical view of the workflow instance
+     * 
+     * @param workflowInstanceId  the workflow instance id
+     * @return image view of the workflow instance as an InputStream or null if a diagram is not available
+     * @since 4.0
+     */
+    public InputStream getWorkflowImage(String workflowInstanceId);
 
 }
 

source/java/org/alfresco/repo/workflow/WorkflowServiceImpl.java

@@ -553,6 +553,19 @@ public class WorkflowServiceImpl implements WorkflowService
         return component.getStartTask(workflowInstanceId);
     }
     
+    /*
+     * (non-Javadoc)
+     * @see
+     * org.alfresco.service.cmr.workflow.WorkflowService#getWorkflowImage(
+     * java.lang.String)
+     */
+    public InputStream getWorkflowImage(String workflowInstanceId)
+    {
+        String engineId = BPMEngineRegistry.getEngineId(workflowInstanceId);
+        WorkflowComponent component = getWorkflowComponent(engineId);
+        return component.getWorkflowImage(workflowInstanceId);
+    }
+    
     /*
      * (non-Javadoc)
      * @see

source/java/org/alfresco/repo/workflow/activiti/ActivitiWorkflowEngine.java

@@ -1000,6 +1000,16 @@ public class ActivitiWorkflowEngine extends BPMEngine implements WorkflowEngine
             throw new WorkflowException(msg, ae);
         }
     }
+    
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public InputStream getWorkflowImage(String workflowInstanceId)
+    {
+        // TODO: Link this up with the underlying Activiti instance diagram API
+        return null;
+    }
 
     /**
      * Converts the given list of {@link ProcessDefinition}s to a list of {@link WorkflowDefinition}s

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 ...
     //