add jmap histogram

oql/JDatta.py

@@ -0,0 +1,36 @@
+#!/usr/bin/python
+import sys
+import operator
+
+# The histogram file path should be given in argument
+# The file should have two columns, key and value 
+# Each line in the histogram file should contain the key
+# then a space and then the value
+# The following code would sum the values against the same 
+# key and print the result in descending order
+
+f = open(sys.argv[1]) # Open the histogram file 
+
+# Create histogram map
+hist = {}
+for line in f:
+    line = line.strip()
+    if line == "":
+        continue
+    fields = line.split()
+    mtype = fields[0].strip()
+    mval = fields[1].strip()
+
+    if mtype in hist:
+        hist[mtype] = hist[mtype] + int(mval)
+    else:
+        # print ">>>" + mval
+        hist[mtype] = int(mval)
+
+# Sort in descending order
+sorted_hist = reversed(sorted(hist.items(), key=operator.itemgetter(1)))
+
+# print
+for i in sorted_hist:
+    print i[1], "\t", i[0]
+