Sudoku: src/main/java/de/uapcore/sudoku/DocumentHandler.java@06170a0be62a (annotated)

src/main/java/de/uapcore/sudoku/DocumentHandler.java@06170a0be62a (annotated)

src/main/java/de/uapcore/sudoku/DocumentHandler.java

Tue, 28 Jul 2020 14:27:14 +0200

author: Mike Becker <universe@uap-core.de>
date: Tue, 28 Jul 2020 14:27:14 +0200
changeset 22: 06170a0be62a
parent 12: 1c62c6009161
permissions: -rw-r--r--

bugfix: modified state is reset even when saving fails + more tests

 /*
  * 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.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 /**
  * Implements load and save routines.
  */
 public class DocumentHandler {
     private String filename;
     /**
      * Loads data into the specified field.
      *
      * @param field the field to populated with the loaded data
      * @throws IOException if loading fails or no file name has been set before
      * @see #setFilename(String)
      */
     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.parseInt(c[i]));
                     }
                     row++;
                 } else {
                     break;
                 }
             }
             if (row != 9) {
                 throw new IOException("Kein Sudoku-Feld enthalten!");
             }
         }
         field.setAllCellsModified(false);
     }
     /**
      * Saves the specified field to a file.
      * On success, the modified state of all cells is set to false.
      *
      * @param field the field to save
      * @throws IOException if saving fails or the file name has not been set before
      * @see #setFilename(String)
      */
     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': ' ');
                 }
             }
         }
         field.setAllCellsModified(false);
     }
     /**
      * Sets the file name for loading and saving data.
      *
      * @param filename the file name
      */
     public void setFilename(String filename) {
         this.filename = filename;
     }
     /**
      * Clears the file name.
      */
     public void clearFilename() {
         filename = null;
     }
     /**
      * Checks whether a file name has been set.
      *
      * @return true if a file name is known, false otherwise
      */
     public boolean isFilenameSet() {
         return filename != null;
     }
 }

Mercurial > hg > Sudoku / annotate

src/main/java/de/uapcore/sudoku/DocumentHandler.java@06170a0be62a (annotated)

src/main/java/de/uapcore/sudoku/DocumentHandler.java