001package net.sf.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 1.2 (Student Sectioning)<br>
018 *          Copyright (C) 2007 - 2010 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}