| commit | author | age | ||
| 081606 | 1 | /* |
| 2b5c60 | 2 | Mediazentrale - Personal Media Center |
| U | 3 | Copyright (C) 2021 Ulrich Hilger |
| 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/>. | |
| 081606 | 17 | */ |
| U | 18 | package de.uhilger.mediaz.store; |
| 19 | ||
| 20 | import com.google.gson.Gson; | |
| b1bf96 | 21 | import com.google.gson.reflect.TypeToken; |
| 081606 | 22 | import de.uhilger.mediaz.App; |
| U | 23 | import de.uhilger.mediaz.Server; |
| 24 | import de.uhilger.mediaz.entity.Ablageort; | |
| cf6509 | 25 | import de.uhilger.mediaz.entity.Einstellung; |
| 081606 | 26 | import java.io.BufferedReader; |
| U | 27 | import java.io.File; |
| 28 | import java.io.FileNotFoundException; | |
| 29 | import java.io.FileReader; | |
| 30 | import java.io.FileWriter; | |
| 31 | import java.io.IOException; | |
| 32 | import java.util.logging.Logger; | |
| 33 | import de.uhilger.mediaz.entity.Entity; | |
| 34 | import java.util.ArrayList; | |
| b1bf96 | 35 | import java.util.HashMap; |
| 081606 | 36 | import java.util.List; |
| b1bf96 | 37 | import java.util.Map; |
| 081606 | 38 | import java.util.logging.Level; |
| U | 39 | |
| 40 | /** | |
| 2b5c60 | 41 | * Ablage fuer Dateien der Mediazentrale |
| 081606 | 42 | * |
| U | 43 | * [Basispfad]/[Typ]/[Name] |
| 44 | * | |
| 45 | * Typ ist eine der Klassen der Package entity | |
| 46 | * Name muss identisch mit dem Element laut Entity.getName() sein | |
| 47 | * | |
| 48 | * @author ulrich | |
| 49 | * @version 1, 5.4.2021 | |
| 50 | */ | |
| 51 | public class FileStorage implements Storage { | |
| 52 | ||
| 53 | private static final Logger logger = Logger.getLogger(FileStorage.class.getName()); | |
| 54 | ||
| 55 | /** StorageType Ablageort */ | |
| 56 | public static final String ST_ABLAGEORT = "Ablageort"; | |
| dce2c7 | 57 | public static final String ST_EINSTELLUNG = "Einstellung"; |
| 081606 | 58 | |
| cf6509 | 59 | private final String fileBase; |
| 081606 | 60 | |
| cf6509 | 61 | private final Map<String, TypeToken> types; |
| b1bf96 | 62 | |
| 081606 | 63 | public FileStorage(String base) { |
| U | 64 | this.fileBase = base; |
| b1bf96 | 65 | |
| 5f70da | 66 | // Beispiel: TypeToken<List<String>> list = new TypeToken<List<String>>() {}; |
| b1bf96 | 67 | TypeToken<Ablageort> ttAblageort = new TypeToken<Ablageort>() {}; |
| cf6509 | 68 | TypeToken<Einstellung> ttEinstellung = new TypeToken<Einstellung>() {}; |
| b1bf96 | 69 | types = new HashMap(); |
| U | 70 | types.put(Ablageort.class.getSimpleName(), ttAblageort); |
| cf6509 | 71 | types.put(Einstellung.class.getSimpleName(), ttEinstellung); |
| 081606 | 72 | } |
| U | 73 | |
| 74 | /** | |
| 75 | * Ein Objekt als JSON in eine Datei schreiben | |
| 76 | * | |
| 77 | * Es wird in den Ordner geschrieben, der von conf angegeben ist | |
| 78 | * | |
| cf6509 | 79 | * Wenn es z.B.ein Ablage-Objekt ist, wird das Objekt in die Datei |
| U | 80 | [conf]/Ablage/[name der Ablage].json geschrieben |
| 81 | ||
| 82 | Der Name der Ablage muss eindeutig sein | |
| 081606 | 83 | * |
| U | 84 | * |
| cf6509 | 85 | * @param entity das Objekt, das geschrieben werden soll |
| U | 86 | * @param overwrite true, wenn Aenderung, false fuer neue Elemente |
| 87 | * @return die Datei oder null, wenn die Datei existiert und ein | |
| 88 | * neues Element (overwrite=false) uebergeben wurde | |
| 89 | * @throws java.io.IOException | |
| 081606 | 90 | */ |
| 2597cd | 91 | public File writeToFile(Entity entity, boolean overwrite) throws IOException { |
| 2b5c60 | 92 | String className = entity.getClass().getSimpleName(); |
| 081606 | 93 | logger.finer(className); |
| U | 94 | File dir = new File(fileBase, className); |
| 95 | dir.mkdirs(); | |
| 2b5c60 | 96 | File file = new File(dir, entity.getName()); |
| 2597cd | 97 | if(file.exists() && !overwrite) { |
| U | 98 | return null; |
| 99 | } else { | |
| 100 | FileWriter fw = new FileWriter(file); | |
| 101 | Gson gson = new Gson(); | |
| 102 | fw.write(gson.toJson(entity)); | |
| 103 | fw.flush(); | |
| 104 | fw.close(); | |
| 105 | return file; | |
| 081606 | 106 | } |
| U | 107 | } |
| 108 | ||
| 5f70da | 109 | public String readFromFile(File file) throws IOException { |
| 081606 | 110 | StringBuilder sb = new StringBuilder(); |
| 5f70da | 111 | BufferedReader r = new BufferedReader(new FileReader(file)); |
| 081606 | 112 | String line = r.readLine(); |
| U | 113 | while(line != null) { |
| 114 | sb.append(line); | |
| 115 | line = r.readLine(); | |
| 116 | } | |
| 117 | r.close(); | |
| 5f70da | 118 | return sb.toString(); |
| U | 119 | } |
| 120 | ||
| 121 | public Entity entityFromFile(File file) throws ClassNotFoundException, FileNotFoundException, IOException { | |
| 122 | String json = readFromFile(file); | |
| 081606 | 123 | Gson gson = new Gson(); |
| 5f70da | 124 | return gson.fromJson(json, typeFromName(typeNameFromPath(file)).getType()); |
| 081606 | 125 | } |
| U | 126 | |
| b1bf96 | 127 | private String typeNameFromPath(File file) { |
| 081606 | 128 | String[] parts = file.getPath().split(App.getRs(Server.RB_SLASH)); |
| U | 129 | return parts[parts.length-2]; |
| 130 | } | |
| 131 | ||
| 132 | @Override | |
| 2597cd | 133 | public Object write(Entity e, boolean overwrite) { |
| 081606 | 134 | try { |
| 2597cd | 135 | return writeToFile(e, overwrite); |
| 081606 | 136 | } catch (IOException ex) { |
| U | 137 | logger.log(Level.SEVERE, null, ex); |
| 138 | return null; | |
| 139 | } | |
| 140 | } | |
| 141 | ||
| 142 | @Override | |
| 143 | public Entity read(String typ, String name) { | |
| 144 | try { | |
| 5f70da | 145 | return entityFromFile(getFile(typ, name)); |
| 081606 | 146 | } catch (ClassNotFoundException | IOException ex) { |
| U | 147 | logger.log(Level.SEVERE, null, ex); |
| 148 | return null; | |
| 149 | } | |
| 150 | } | |
| 151 | ||
| 152 | @Override | |
| 153 | public List<String> list(String typ) { | |
| 154 | File base = new File(fileBase); | |
| 155 | File dir = new File(base, typ); | |
| 156 | List<String> list = new ArrayList(); | |
| b29119 | 157 | File[] files = dir.listFiles(); |
| U | 158 | if(files != null) { |
| 159 | for(File file : files) { | |
| 160 | //NamedItem n = new NamedItem(); | |
| 161 | //n.setLabel(file.getName()); | |
| 162 | list.add(file.getName()); | |
| 163 | } | |
| 081606 | 164 | } |
| U | 165 | return list; |
| 166 | } | |
| 167 | ||
| b1bf96 | 168 | @Override |
| U | 169 | public TypeToken typeFromName(String name) { |
| 170 | return types.get(name); | |
| 171 | } | |
| 172 | ||
| 5f70da | 173 | @Override |
| U | 174 | public String readJson(String typ, String name) { |
| 175 | try { | |
| 176 | return readFromFile(getFile(typ, name)); | |
| 177 | } catch (IOException ex) { | |
| 178 | logger.log(Level.SEVERE, null, ex); | |
| 179 | return null; | |
| 180 | } | |
| 181 | } | |
| 182 | ||
| 183 | private File getFile(String typ, String name) { | |
| 184 | File base = new File(fileBase); | |
| 185 | File dir = new File(base, typ); | |
| 186 | return new File(dir, name); | |
| 187 | } | |
| 188 | ||
| 2b5c60 | 189 | @Override |
| U | 190 | public boolean delete(String typ, String name) { |
| 191 | File file = getFile(typ, name); | |
| 192 | if(file.exists()) { | |
| 193 | return file.delete(); | |
| 194 | } else { | |
| 195 | return false; | |
| 196 | } | |
| 197 | } | |
| 081606 | 198 | |
| U | 199 | } |
