--- ECHO_content/ECHO_helpers.py	2012/01/17 18:39:07	1.103.2.3
+++ ECHO_content/ECHO_helpers.py	2012/01/19 19:03:28	1.103.2.4
@@ -11,6 +11,7 @@ from OFS.SimpleItem import SimpleItem
 from Globals import package_home
 import Globals
 from AccessControl import ClassSecurityInfo
+from Acquisition import aq_parent,aq_chain,aq_base
 import os.path
 from OFS.Folder import Folder
 import ECHO_collection
@@ -694,6 +695,41 @@ def checkOnlyOneInGroup(object):
         else:           return object
 
 
+
+def getCrumb(self):
+    """returns breadcrumb for this object"""
+    # ignore this object if title is empty
+    if not self.title:
+        return None
+    
+    crumb = {'obj': self,
+             'url': self.absolute_url(),
+             'label': self.getLabel()}
+    return crumb        
+
+# roots of the ECHO hierarchy
+rootMetaTypes = ['ECHO_root', 'ECHO_main', 'ECHO_nav']
+
+def getHierCrumbs(self):
+    """returns a list of hierarchical breadcrumbs from self to the ECHO_root"""
+    crumbs = []
+    # walk the acquisition chain
+    for obj in aq_chain(self):
+        #logging.debug("getHiercrumbs: obj=%s"%(obj))
+        # test if the object really has a getCrumb method
+        if hasattr(aq_base(obj), 'getCrumb'):
+            crumb = obj.getCrumb()
+            #logging.debug("getHiercrumbs: got %s from %s"%(crumb,obj))
+            if crumb is not None:
+                crumbs.insert(0, crumb)
+                
+            if obj.meta_type in rootMetaTypes:
+                # stop when we reach the ECHO root
+                return crumbs
+        
+    return crumbs        
+
+
 def getSubCols(self, sortfield=None, 
                subColTypes=displayTypes, 
                sortFieldMD=None,