Here you can find the source of createOutputTuple(List> tuples)
public static List<String> createOutputTuple(List<List<String>> tuples)
//package com.java2s; /*/*from w w w. j av a2 s. c o m*/ * Copyright (c) 2011-2015 EPFL DATA Laboratory * Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE) * * All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.ArrayList; import java.util.List; public class Main { public static List<String> createOutputTuple(List<String> firstTuple, List<String> secondTuple) { final List<String> outputTuple = new ArrayList<String>(); for (int j = 0; j < firstTuple.size(); j++) // first relation (R) outputTuple.add(firstTuple.get(j)); for (int j = 0; j < secondTuple.size(); j++) outputTuple.add(secondTuple.get(j)); return outputTuple; } public static List<String> createOutputTuple(List<String> firstTuple, List<String> secondTuple, List<Integer> joinParams) { final List<String> outputTuple = new ArrayList<String>(); for (int j = 0; j < firstTuple.size(); j++) // first relation (R) outputTuple.add(firstTuple.get(j)); for (int j = 0; j < secondTuple.size(); j++) if ((joinParams == null) || (!joinParams.contains(j))) // not // exits // add // the // column!! // (S) outputTuple.add(secondTuple.get(j)); return outputTuple; } public static List<String> createOutputTuple(List<List<String>> tuples) { final List<String> outputTuple = new ArrayList<String>(); for (List<String> tpI : tuples) { for (String coulumnJ : tpI) { outputTuple.add(coulumnJ); } } return outputTuple; } }