Github user smarthi commented on a diff in the pull request:
https://github.com/apache/incubator-pirk/pull/74#discussion_r75535198
--- Diff:
src/main/java/org/apache/pirk/responder/wideskies/common/ComputeEncryptedRow.java
---
@@ -319,4 +314,80 @@ public static void loadCacheFromHDFS(FileSystem fs,
String hdfsFileName, Query q
return returnPairs;
}
+
+ /**
+ * Method to compute the encrypted row elements for a query from
extracted data partitions in the form of ArrayList<<BigInteger>>
+ * <p/>
+ * For each row (as indicated by key = hash(selector)), iterates over
the dataPartitions and calculates the column values.
+ * <p/>
+ * Uses a static LRU cache for the modular exponentiation
+ * <p/>
+ * Caller is responsible for keeping track of the colIndex and the the
maxHitsPerSelector values
+ * <p/>
+ * Emits {@code Tuple2<<colNum, colVal>>}
+ */
+ public static ArrayList<Tuple2<Long,BigInteger>>
computeEncRow(ArrayList<BigInteger> dataPartitions, Query query, int rowIndex,
int colIndex)
+ throws IOException
+ {
+ ArrayList<Tuple2<Long,BigInteger>> returnPairs = new
ArrayList<Tuple2<Long,BigInteger>>();
+
+ // Pull the corresponding encrypted row query
+ BigInteger rowQuery = query.getQueryElement(rowIndex);
+
+ // Initialize the column counter
+ long colCounter = colIndex;
+
+ logger.debug("dataPartitions.size() = " + dataPartitions + " rowIndex
= " + rowIndex + " colCounter = " + colCounter);
+
+ // Update the associated column values
+ for (int i = 0; i < dataPartitions.size(); ++i)
+ {
+ BigInteger part = dataPartitions.get(i);
+
+ BigInteger exp = null;
+ try
+ {
+ exp = expCache.get(new
Tuple3<BigInteger,BigInteger,BigInteger>(rowQuery, part, query.getNSquared()));
+ } catch (ExecutionException e)
+ {
+ e.printStackTrace();
+ }
+
+ logger.debug("rowIndex = " + rowIndex + " colCounter = " +
colCounter + " part = " + part.toString() + " part binary = " +
part.toString(2) + " exp = "
+ + exp + " i = " + i + " partition = " + dataPartitions.get(i) +
" = " + dataPartitions.get(i).toString(2));
+
+ returnPairs.add(new Tuple2<Long,BigInteger>(colCounter, exp));
+
+ ++colCounter;
+ }
+
+ return returnPairs;
+ }
+
+ public static ArrayList<Tuple2<Long,BigInteger>>
computeEncRow(BigInteger part, Query query, int rowIndex, int colIndex) throws
IOException
+ {
+ ArrayList<Tuple2<Long,BigInteger>> returnPairs = new
ArrayList<Tuple2<Long,BigInteger>>();
--- End diff --
Use a List on LHS and as return type of method
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