| commit | author | age | ||
| e369b9 | 1 | /* |
| c45b52 | 2 | fm - File management class library |
| e369b9 | 3 | Copyright (C) 2024 Ulrich Hilger |
| U | 4 | |
| 5 | This program is free software: you can redistribute it and/or modify | |
| 6 | it under the terms of the GNU Affero General Public License as | |
| 7 | published by the Free Software Foundation, either version 3 of the | |
| 8 | License, or (at your option) any later version. | |
| 9 | ||
| 10 | This program is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | GNU Affero General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Affero General Public License | |
| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | package de.uhilger.fm; | |
| 19 | ||
| 20 | import java.io.File; | |
| 21 | ||
| 22 | /** | |
| 23 | * FileHelper | |
| 24 | * | |
| 25 | * @author Ulrich Hilger | |
| 26 | * @version 1, 04.07.2021 | |
| 27 | */ | |
| 28 | public class FileHelper { | |
| 29 | ||
| 30 | /** | |
| 31 | * Einen Namen fuer eine Datei erzeugen, der noch nicht existiert. | |
| 32 | * | |
| 33 | * Der Dateiname wird wie folgt gebildet | |
| 34 | * '[Bestehender Dateiname]-[Nummer].[Erweiterung]' | |
| 35 | * | |
| 36 | * Ordner haben in der Regel keine Erweiterung, dann lautet der neue Name | |
| 37 | * '[Bestehender Ordnername]-[Nummer]' | |
| 38 | * | |
| 39 | * Fuer Nummer wird eine Nummer mit 1 beginnend heraufgezaehlt bis ein | |
| 40 | * Dateiname entsteht, den es im betreffenden Ordner noch nicht gibt. | |
| 41 | * | |
| 42 | * @param file die Datei, die schon existiert | |
| 43 | * @return ein Dateiname, der im Ordner noch nicht verwendet wird | |
| 44 | */ | |
| 45 | public File getNewFileName(File file) { | |
| 46 | File dir = file.getParentFile(); | |
| 47 | String targetName = file.getName(); | |
| 48 | //logger.fine("targetName: " + targetName); | |
| 49 | String ext = ""; | |
| 50 | int dotpos = targetName.indexOf("."); | |
| 51 | if (dotpos > -1) { | |
| 52 | ext = targetName.substring(dotpos); | |
| 53 | targetName = targetName.substring(0, dotpos); | |
| 54 | } | |
| 55 | //logger.fine("targetName: " + targetName + ", ext: " + ext); | |
| 56 | int i = 1; | |
| 57 | while (file.exists()) { | |
| 58 | StringBuilder buf = new StringBuilder(); | |
| 59 | buf.append(targetName); | |
| 60 | buf.append("-"); | |
| 61 | buf.append(i); | |
| 62 | if (ext.length() > 0) { | |
| 63 | buf.append(ext); | |
| 64 | } | |
| 65 | file = new File(dir, buf.toString()); | |
| 66 | i++; | |
| 67 | } | |
| 68 | //logger.fine("new file: " + file.getName()); | |
| 69 | return file; | |
| 70 | } | |
| 71 | ||
| 72 | } | |
