universe@5: /*
universe@5:  * Copyright 2013 Mike Becker. All rights reserved.
universe@5:  * 
universe@5:  * Redistribution and use in source and binary forms, with or without
universe@5:  * modification, are permitted provided that the following conditions are met:
universe@5:  * 
universe@5:  * 1. Redistributions of source code must retain the above copyright
universe@5:  *    notice, this list of conditions and the following disclaimer.
universe@5:  * 
universe@5:  * 2. Redistributions in binary form must reproduce the above copyright
universe@5:  *    notice, this list of conditions and the following disclaimer in the
universe@5:  *    documentation and/or other materials provided with the distribution.
universe@5:  * 
universe@5:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@5:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@5:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@5:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@5:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@5:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@5:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@5:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@5:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@5:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@5:  * POSSIBILITY OF SUCH DAMAGE.
universe@5:  */
universe@5: 
universe@5: package de.uapcore.sudoku;
universe@5: 
universe@9: import java.io.*;
universe@6: import java.util.regex.Matcher;
universe@6: import java.util.regex.Pattern;
universe@5: 
universe@5: /**
universe@11:  * Implements load and save routines.
universe@5:  */
universe@5: public class DocumentHandler {
universe@5:     
universe@5:     private String filename;
universe@10: 
universe@10:     /**
universe@10:      * Loads data into the specified field.
universe@10:      *
universe@10:      * @param field the field to populated with the loaded data
universe@10:      * @throws IOException if loading fails or no file name has been set before
universe@10:      * @see #setFilename(String)
universe@10:      */
universe@5:     public void load(Field field) throws IOException {
universe@5:         if (!isFilenameSet()) {
universe@5:             throw new IOException("no filename supplied");
universe@5:         }
universe@6:         int row = 0;
universe@6:         try (BufferedReader in = new BufferedReader(
universe@6:                 new InputStreamReader(new FileInputStream(filename)))) {
universe@6:             Pattern pat = Pattern.compile("^\\s*(?:[1-9_] ){8}[1-9_]\\s*$");
universe@6:             String line;
universe@6:             while ((line = in.readLine()) != null) {
universe@6:                 if (line.matches("^\\s*$")) {
universe@6:                     continue;
universe@6:                 }
universe@6:                 Matcher m = pat.matcher(line);
universe@6:                 if (m.matches()) {
universe@12:                     String[] c = line.trim().split(" ");
universe@6:                     if (c.length != 9) {
universe@6:                         break;
universe@6:                     }
universe@6:                     for (int i = 0 ; i < 9 ; i++) {
universe@6:                         field.setCellValue(i, row,
universe@12:                                 c[i].equals("_") ? 0 : Integer.parseInt(c[i]));
universe@6:                     }
universe@6:                     row++;
universe@6:                 } else {
universe@6:                     break;
universe@6:                 }
universe@6:             }
universe@6:             if (row != 9) {
universe@6:                 throw new IOException("Kein Sudoku-Feld enthalten!");
universe@6:             }
universe@6:         }
universe@7:         field.setAllCellsModified(false);
universe@5:     }
universe@10: 
universe@10:     /**
universe@10:      * Saves the specified field to a file.
universe@22:      * On success, the modified state of all cells is set to false.
universe@10:      *
universe@10:      * @param field the field to save
universe@10:      * @throws IOException if saving fails or the file name has not been set before
universe@10:      * @see #setFilename(String)
universe@10:      */
universe@5:     public void save(Field field) throws IOException {
universe@5:         if (!isFilenameSet()) {
universe@5:             throw new IOException("no filename supplied");
universe@5:         }
universe@5:         
universe@5:         try (BufferedWriter out = new BufferedWriter(
universe@5:                 new OutputStreamWriter(new FileOutputStream(filename)))) {
universe@5:             for (int i = 0 ; i < 9 ; i++) {
universe@5:                 int[] row = field.getRow(i);
universe@5:                 for (int j = 0 ; j < 9 ; j++) {
universe@5:                     out.append(row[j] > 0 ? Character.forDigit(row[j], 10):'_');
universe@5:                     out.append(j == 8 ? '\n': ' ');
universe@5:                 }
universe@5:             }
universe@5:         }
universe@22:         field.setAllCellsModified(false);
universe@5:     }
universe@10: 
universe@10:     /**
universe@10:      * Sets the file name for loading and saving data.
universe@10:      *
universe@10:      * @param filename the file name
universe@10:      */
universe@5:     public void setFilename(String filename) {
universe@5:         this.filename = filename;
universe@5:     }
universe@10: 
universe@10:     /**
universe@10:      * Clears the file name.
universe@10:      */
universe@5:     public void clearFilename() {
universe@5:         filename = null;
universe@5:     }
universe@10: 
universe@10:     /**
universe@10:      * Checks whether a file name has been set.
universe@10:      *
universe@10:      * @return true if a file name is known, false otherwise
universe@10:      */
universe@5:     public boolean isFilenameSet() {
universe@5:         return filename != null;
universe@5:     }
universe@5: }