1 package org.apache.helix.alerts;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.ArrayList;
23 import java.util.Iterator;
24 import java.util.List;
25
26 public class SumEachOperator extends Operator {
27
28 public SumEachOperator() {
29 minInputTupleLists = 1;
30 maxInputTupleLists = Integer.MAX_VALUE;
31 inputOutputTupleListsCountsEqual = true;
32 numOutputTupleLists = -1;
33 }
34
35 //for each column, generate sum
36 @Override
37 public List<Iterator<Tuple<String>>> execute(List<Iterator<Tuple<String>>> input) {
38 List<Iterator<Tuple<String>>> out = new ArrayList<Iterator<Tuple<String>>>();
39 for (Iterator<Tuple<String>> currIt : input) {
40 Tuple<String> currSum = null;
41 while (currIt.hasNext()) {
42 currSum = sumTuples(currSum, currIt.next());
43 }
44 ArrayList<Tuple<String>> currOutList = new ArrayList<Tuple<String>>();
45 currOutList.add(currSum);
46 out.add(currOutList.iterator());
47 }
48 return out;
49 }
50
51 }