[jboss-svn-commits] JBL Code SVN: r14375 - labs/jbossrules/trunk/drools-decisiontables/src/main/resources.

[jboss-svn-commits at lists.jboss.org]

Author: michael.neale at jboss.com
Date: 2007-08-19 20:35:07 -0400 (Sun, 19 Aug 2007)
New Revision: 14375

Added:
   labs/jbossrules/trunk/drools-decisiontables/src/main/resources/PyDT.py
Log:
experimental python decision tables

Added: labs/jbossrules/trunk/drools-decisiontables/src/main/resources/PyDT.py
===================================================================
--- labs/jbossrules/trunk/drools-decisiontables/src/main/resources/PyDT.py	                        (rev 0)
+++ labs/jbossrules/trunk/drools-decisiontables/src/main/resources/PyDT.py	2007-08-20 00:35:07 UTC (rev 14375)
@@ -0,0 +1,91 @@
+#this is PyDT - Python Decision Tables
+# (c) 2007 Michael Neale (michael at michaelneale.net)  
+# Use entirely at your own risk !
+# Licenced under LGPL unless stated otherwise
+
+
+fact = { "Age" : 42, "Risk" : "'HIGH'", "PolicyType" : "'COMPREHENSIVE'" }
+
+table = {
+    "condition_headers" : [ ["A" , "Age"], ["B", "Risk =="], ["C", "PolicyType =="]],
+    "action_headers" : [ ["F","Premium"], ["G","Log"]],
+    
+
+    "data" : [ 
+        {"row" : 2, "A" : "> 2", "B" : "'HIGH'", "C": "'COMPREHENSIVE'",  "F" : "245"},
+        {"row" : 3, "A" : "< 25 ", "B" : "'LOW'", "F" : "390"}
+        ]
+
+}
+
+def make_header(hdr) :
+    splut = hdr[1].split(' ')
+    if len(splut) > 1 :
+    #if hdr[1].contains(' ') :
+        #itms = hdr[1].split(' ')
+        return [hdr[0], fact[splut[0]] + ' ' + splut[1]] 
+    else :
+        return [hdr[0], fact[hdr[1]]]
+        
+
+#calc the headers
+headers = map(make_header, table['condition_headers'])
+
+    
+
+
+for row in table['data'] :
+    #go through all the conditions, evaluating
+    row_pass = True
+    for condition in headers :
+        col_index = condition[0]
+        cell_value = row[col_index]
+         
+        predicate = str(condition[1]) + str(cell_value)
+        
+        if not eval(predicate) :
+            #then failure due to negation
+            row_pass = False
+            break
+        #if they all pass
+        #then iterate through and apply the action (unless we finish on first match)
+        #thats it !
+    if row_pass :
+        for action in table['action_headers'] :
+            
+            col_label = action[0]
+            if (row.has_key(col_label)) :
+                fact[action[1]] = row[col_label]
+    
+
+
+
+print str(fact)
+
+#lets try a map based approach
+def eval_table(row) :
+    #go through all the conditions, evaluating
+    row_pass = True
+    for condition in headers :
+        col_index = condition[0]
+        cell_value = row[col_index]
+         
+        predicate = str(condition[1]) + str(cell_value)
+        
+        if not eval(predicate) :
+            #then failure due to negation
+            row_pass = False
+            break
+        #if they all pass
+        #then iterate through and apply the action (unless we finish on first match)
+        #thats it !
+    if row_pass :
+        for action in table['action_headers'] :
+            
+            col_label = action[0]
+            if (row.has_key(col_label)) :
+                fact[action[1]] = row[col_label]
+
+map(eval_table, table['data'])
+
+


Property changes on: labs/jbossrules/trunk/drools-decisiontables/src/main/resources/PyDT.py
___________________________________________________________________
Name: svn:eol-style
   + native