From 1786a0e660f299f1608dd2e8087843e71de8fb3f Mon Sep 17 00:00:00 2001
From: rcoh <rcoh@mit.edu>
Date: Sat, 25 Dec 2010 13:42:25 -0500
Subject: early stages.  WARNING: THIS COMMIT DOESN'T NECESSARILY WORK.  Sorry.
 RCOH

---
 util/Config.py  | 30 ++++++++++++++++++++++++++++++
 util/Strings.py |  5 +++++
 2 files changed, 35 insertions(+)

diff --git a/util/Config.py b/util/Config.py
index f80b7b2..bf1d5da 100644
--- a/util/Config.py
+++ b/util/Config.py
@@ -1,4 +1,5 @@
 from xml.etree.ElementTree import ElementTree
+import util.Strings as Strings
 classArgsMem = {}
 CONFIG_PATH = 'config/'
 def loadParamRequirementDict(className):
@@ -16,6 +17,35 @@ def loadConfigFile(fileName): #TODO: error handling etc.
             return config
     #except:
         return None
+def compositeXMLTrees(parentTree, overridingTree):
+    #type checking -- convert ElementTrees to their root elements
+    parentItems = parentTree.getchildren()
+    overrideItems = overridingTree.getchildren()
+    #first, lets figure out what tags we have in the override tree:
+    tagCollection = [el.tag for el in overrideItems] #we can speed this up with a dict if necessary
+    overrideRoot = overridingTree.getroot()
+    for item in parentItems:
+        if not item.tag in tagCollection: #no override 
+            overrideRoot.insert(-1, item) #insert the new item at the end
+        else:
+            #do we merge or replace?
+            intersectingElements = findElementsByTag(item.tag, overrideItems)
+            if len(intersectingItems) > 1:
+                print 'ABUSE!'
+            interEl = intersectingElements[0]
+            mode = 'Replace'
+            if Strings.OVERRIDE_BEHAVIOR in interEl.attrib:
+                mode = interEl.attrib[Strings.OVERRIDE_BEHAVIOR] 
+            if mode != 'Replace' and mode != 'Merge':
+                print 'Bad Mode.  Replacing'
+                mode = 'Replace'
+            if mode = 'Replace':
+                pass #we don't need to do anything
+            if mode = 'Merge': 
+                pass #TODO: code this
+
+def findElementsByTag(tag, eList):
+    return [el for el in eList if el.tag == tag]
 def fileToDict(fileName):
     fileText = ''
     try:
diff --git a/util/Strings.py b/util/Strings.py
index 81c34f2..698b4ec 100644
--- a/util/Strings.py
+++ b/util/Strings.py
@@ -1,2 +1,7 @@
 LOCATION = 'Location'
 DEFAULT_MAPPER = 'DefaultPixelMapper'
+
+
+
+#XMLStuff
+OVERRIDE_BEHAVIOR
-- 
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