--- ECHO_content/ECHO_collection.py	2004/10/27 16:05:55	1.185
+++ ECHO_content/ECHO_collection.py	2004/10/28 10:57:05	1.186
@@ -3109,6 +3109,23 @@ class ECHO_root(Folder,Persistent,Implic
 	#return "http://enlil.museum.upenn.edu/cgi-bin/cdlget.plx?item=%s&project=ncdl"
     ###END CDLI add
 
+
+    def checkResource(self,id):
+	    """checks if a resource is in the tree, gives back none or list of resources"""
+	    if hasattr(self,"_v_checkResource") and self._v_checkResource.has_key(id): #existiert ein cache und id ist bereits drin?
+			    return self._v_checkResource[id]
+
+	    else:
+		    resources=self.ZopeFind(self,obj_metatypes=['ECHO_resource'],obj_ids=[id],search_sub=1)
+
+		    if not hasattr(self,"_v_checkResource"): self._v_checkResource={}#lege cache an falls nicht existent
+		    if resources:
+			    self._v_checkResource[id]=resources[0:] # slicing to be sure that data is stabil
+		    else:
+			    self._v_checkResource[id]=None
+		    
+		    return self._v_checkResource[id]
+	    
     def sendForm(self,fromaddr,content,server='mail.mpiwg-berlin.mpg.de'):
 	    """sendform"""
 	    toaddrs=["dwinter@mpiwg-berlin.mpg.de"]