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 * @author  Tomáš Müller
018 * @version StudentSct 1.3 (Student Sectioning)<br>
019 *          Copyright (C) 2007 - 2014 Tomáš Müller<br>
020 *          <a href="mailto:muller@unitime.org">muller@unitime.org</a><br>
021 *          <a href="http://muller.unitime.org">http://muller.unitime.org</a><br>
022 * <br>
023 *          This library is free software; you can redistribute it and/or modify
024 *          it under the terms of the GNU Lesser General Public License as
025 *          published by the Free Software Foundation; either version 3 of the
026 *          License, or (at your option) any later version. <br>
027 * <br>
028 *          This library is distributed in the hope that it will be useful, but
029 *          WITHOUT ANY WARRANTY; without even the implied warranty of
030 *          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
031 *          Lesser General Public License for more details. <br>
032 * <br>
033 *          You should have received a copy of the GNU Lesser General Public
034 *          License along with this library; if not see
035 *          <a href='http://www.gnu.org/licenses/'>http://www.gnu.org/licenses/</a>.
036 */
037public class GetChoices {
038
039    public static void getChoicesFile(File folder, List<List<String>> choices, String prefix) {
040        File choicesFile = new File(folder, "choices.csv");
041        if (choicesFile.exists()) {
042            System.out.println("Reading " + choicesFile + " ...");
043            try {
044                List<String> prefixes = null;
045                if (choices.isEmpty()) {
046                    prefixes = new ArrayList<String>();
047                    choices.add(prefixes);
048                } else {
049                    prefixes = choices.get(0);
050                }
051                prefixes.add(prefix);
052                BufferedReader reader = new BufferedReader(new FileReader(choicesFile));
053                String line = null;
054                for (int idx = 1; (line = reader.readLine()) != null; idx++) {
055                    List<String> cx = null;
056                    if (choices.size() <= idx) {
057                        cx = new ArrayList<String>();
058                        choices.add(cx);
059                    } else {
060                        cx = choices.get(idx);
061                    }
062                    cx.add(line);
063                }
064                reader.close();
065            } catch (Exception e) {
066                System.err.println("Error reading file " + choicesFile + ", message: " + e.getMessage());
067            }
068        }
069    }
070
071    public static void getChoices(File folder, List<List<String>> choices, String prefix) {
072        System.out.println("Checking " + folder + " ...");
073        File[] files = folder.listFiles();
074        getChoicesFile(folder, choices, (prefix == null ? "" : prefix));
075        for (int i = 0; i < files.length; i++)
076            if (files[i].isDirectory())
077                getChoices(files[i], choices, (prefix == null ? "" : prefix + "/") + files[i].getName());
078    }
079
080    public static void writeChoices(List<List<String>> choices, File file) {
081        try {
082            System.out.println("Writing " + file + " ...");
083            PrintWriter writer = new PrintWriter(new FileWriter(file, false));
084            for (List<String> cx : choices) {
085                for (Iterator<String> f = cx.iterator(); f.hasNext();) {
086                    String s = f.next();
087                    writer.print(s);
088                    if (f.hasNext())
089                        writer.print(",");
090                }
091                writer.println();
092            }
093            writer.flush();
094            writer.close();
095        } catch (Exception e) {
096            System.err.println("Error writing file " + file + ", message: " + e.getMessage());
097        }
098    }
099
100    public static void main(String[] args) {
101        try {
102            File folder = new File(args[0]);
103            List<List<String>> choices = new ArrayList<List<String>>();
104            getChoices(folder, choices, null);
105            if (!choices.isEmpty())
106                writeChoices(choices, new File(folder, "all-choices.csv"));
107        } catch (Exception e) {
108            e.printStackTrace();
109        }
110    }
111}