    001package org.cpsolver.studentsct;
    002
    003import java.io.BufferedReader;
    004import java.io.File;
    005import java.io.FileReader;
    006import java.io.FileWriter;
    007import java.io.PrintWriter;
    008import java.util.ArrayList;
    009import java.util.Iterator;
    010import java.util.List;
    011
    012/**
    013 * Process all choice files (files choices.csv) in all subfolders of the given
    014 * folder and create a CSV (comma separated values text file) combining all
    015 * choices (one column for each choice file) of the found choices files.
    016 *
    017 * @version StudentSct 1.3 (Student Sectioning)<br>
    018 *          Copyright (C) 2007 - 2014 Tomáš Müller<br>
    019 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
    020 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
    021 * <br>
    022 *          This library is free software; you can redistribute it and/or modify
    023 *          it under the terms of the GNU Lesser General Public License as
    024 *          published by the Free Software Foundation; either version 3 of the
    025 *          License, or (at your option) any later version. <br>
    026 * <br>
    027 *          This library is distributed in the hope that it will be useful, but
    028 *          WITHOUT ANY WARRANTY; without even the implied warranty of
    029 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    030 *          Lesser General Public License for more details. <br>
    031 * <br>
    032 *          You should have received a copy of the GNU Lesser General Public
    033 *          License along with this library; if not see
    034 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
    035 */
    036public class GetChoices {
    037
    038    public static void getChoicesFile(File folder, List<List<String>> choices, String prefix) {
    039        File choicesFile = new File(folder, "choices.csv");
    040        if (choicesFile.exists()) {
    041            System.out.println("Reading " + choicesFile + " ...");
    042            try {
    043                List<String> prefixes = null;
    044                if (choices.isEmpty()) {
    045                    prefixes = new ArrayList<String>();
    046                    choices.add(prefixes);
    047                } else {
    048                    prefixes = choices.get(0);
    049                }
    050                prefixes.add(prefix);
    051                BufferedReader reader = new BufferedReader(new FileReader(choicesFile));
    052                String line = null;
    053                for (int idx = 1; (line = reader.readLine()) != null; idx++) {
    054                    List<String> cx = null;
    055                    if (choices.size() <= idx) {
    056                        cx = new ArrayList<String>();
    057                        choices.add(cx);
    058                    } else {
    059                        cx = choices.get(idx);
    060                    }
    061                    cx.add(line);
    062                }
    063                reader.close();
    064            } catch (Exception e) {
    065                System.err.println("Error reading file " + choicesFile + ", message: " + e.getMessage());
    066            }
    067        }
    068    }
    069
    070    public static void getChoices(File folder, List<List<String>> choices, String prefix) {
    071        System.out.println("Checking " + folder + " ...");
    072        File[] files = folder.listFiles();
    073        getChoicesFile(folder, choices, (prefix == null ? "" : prefix));
    074        for (int i = 0; i < files.length; i++)
    075            if (files[i].isDirectory())
    076                getChoices(files[i], choices, (prefix == null ? "" : prefix + "/") + files[i].getName());
    077    }
    078
    079    public static void writeChoices(List<List<String>> choices, File file) {
    080        try {
    081            System.out.println("Writing " + file + " ...");
    082            PrintWriter writer = new PrintWriter(new FileWriter(file, false));
    083            for (List<String> cx : choices) {
    084                for (Iterator<String> f = cx.iterator(); f.hasNext();) {
    085                    String s = f.next();
    086                    writer.print(s);
    087                    if (f.hasNext())
    088                        writer.print(",");
    089                }
    090                writer.println();
    091            }
    092            writer.flush();
    093            writer.close();
    094        } catch (Exception e) {
    095            System.err.println("Error writing file " + file + ", message: " + e.getMessage());
    096        }
    097    }
    098
    099    public static void main(String[] args) {
    100        try {
    101            File folder = new File(args[0]);
    102            List<List<String>> choices = new ArrayList<List<String>>();
    103            getChoices(folder, choices, null);
    104            if (!choices.isEmpty())
    105                writeChoices(choices, new File(folder, "all-choices.csv"));
    106        } catch (Exception e) {
    107            e.printStackTrace();
    108        }
    109    }
    110}