diff -r e70a0e3555fb -r 576e7a2861ae src/de/uapcore/sudoku/DocumentHandler.java
--- a/src/de/uapcore/sudoku/DocumentHandler.java	Fri Feb 01 10:18:47 2013 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,110 +0,0 @@
-/*
- * Copyright 2013 Mike Becker. All rights reserved.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- * 
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-package de.uapcore.sudoku;
-
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-/**
- *
- * @author mike
- */
-public class DocumentHandler {
-    
-    private String filename;
-    
-    public void load(Field field) throws IOException {
-        if (!isFilenameSet()) {
-            throw new IOException("no filename supplied");
-        }
-        int row = 0;
-        try (BufferedReader in = new BufferedReader(
-                new InputStreamReader(new FileInputStream(filename)))) {
-            Pattern pat = Pattern.compile("^\\s*(?:[1-9_] ){8}[1-9_]\\s*$");
-            String line;
-            while ((line = in.readLine()) != null) {
-                if (line.matches("^\\s*$")) {
-                    continue;
-                }
-                Matcher m = pat.matcher(line);
-                if (m.matches()) {
-                    String c[] = line.trim().split(" ");
-                    if (c.length != 9) {
-                        break;
-                    }
-                    for (int i = 0 ; i < 9 ; i++) {
-                        field.setCellValue(i, row,
-                                c[i].equals("_") ? 0 : Integer.valueOf(c[i]));
-                    }
-                    row++;
-                } else {
-                    break;
-                }
-            }
-            if (row != 9) {
-                throw new IOException("Kein Sudoku-Feld enthalten!");
-            }
-        }
-        field.setAllCellsModified(false);
-    }
-    
-    public void save(Field field) throws IOException {
-        if (!isFilenameSet()) {
-            throw new IOException("no filename supplied");
-        }
-        
-        try (BufferedWriter out = new BufferedWriter(
-                new OutputStreamWriter(new FileOutputStream(filename)))) {
-            for (int i = 0 ; i < 9 ; i++) {
-                int[] row = field.getRow(i);
-                for (int j = 0 ; j < 9 ; j++) {
-                    out.append(row[j] > 0 ? Character.forDigit(row[j], 10):'_');
-                    out.append(j == 8 ? '\n': ' ');
-                }
-            }
-        }
-    }
-    
-    public void setFilename(String filename) {
-        this.filename = filename;
-    }
-    
-    public void clearFilename() {
-        filename = null;
-    }
-    
-    public boolean isFilenameSet() {
-        return filename != null;
-    }
-}