/*
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Mediazentrale - Personal Media Center
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Copyright (C) 2021 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package de.uhilger.mediaz.store;
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import com.google.gson.Gson;
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import com.google.gson.reflect.TypeToken;
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import de.uhilger.mediaz.App;
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import de.uhilger.mediaz.Server;
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import de.uhilger.mediaz.entity.Ablageort;
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import de.uhilger.mediaz.entity.Einstellung;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.util.logging.Logger;
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import de.uhilger.mediaz.entity.Entity;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.logging.Level;
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/**
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* Ablage fuer Dateien der Mediazentrale
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*
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* [Basispfad]/[Typ]/[Name]
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*
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* Typ ist eine der Klassen der Package entity
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* Name muss identisch mit dem Element laut Entity.getName() sein
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*
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* @author ulrich
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* @version 1, 5.4.2021
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*/
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public class FileStorage implements Storage {
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private static final Logger logger = Logger.getLogger(FileStorage.class.getName());
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/** StorageType Ablageort */
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public static final String ST_ABLAGEORT = "Ablageort";
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public static final String ST_EINSTELLUNG = "Einstellung";
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private final String fileBase;
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private final Map<String, TypeToken> types;
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public FileStorage(String base) {
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this.fileBase = base;
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// Beispiel: TypeToken<List<String>> list = new TypeToken<List<String>>() {};
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TypeToken<Ablageort> ttAblageort = new TypeToken<Ablageort>() {};
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TypeToken<Einstellung> ttEinstellung = new TypeToken<Einstellung>() {};
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types = new HashMap();
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types.put(Ablageort.class.getSimpleName(), ttAblageort);
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types.put(Einstellung.class.getSimpleName(), ttEinstellung);
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}
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/**
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* Ein Objekt als JSON in eine Datei schreiben
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*
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* Es wird in den Ordner geschrieben, der von conf angegeben ist
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*
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* Wenn es z.B.ein Ablage-Objekt ist, wird das Objekt in die Datei
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[conf]/Ablage/[name der Ablage].json geschrieben
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Der Name der Ablage muss eindeutig sein
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*
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*
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* @param entity das Objekt, das geschrieben werden soll
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* @param overwrite true, wenn Aenderung, false fuer neue Elemente
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* @return die Datei oder null, wenn die Datei existiert und ein
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* neues Element (overwrite=false) uebergeben wurde
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* @throws java.io.IOException
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*/
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public File writeToFile(Entity entity, boolean overwrite) throws IOException {
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String className = entity.getClass().getSimpleName();
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logger.finer(className);
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File dir = new File(fileBase, className);
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dir.mkdirs();
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File file = new File(dir, entity.getName());
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if(file.exists() && !overwrite) {
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return null;
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} else {
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FileWriter fw = new FileWriter(file);
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Gson gson = new Gson();
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fw.write(gson.toJson(entity));
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fw.flush();
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fw.close();
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return file;
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}
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}
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public String readFromFile(File file) throws IOException {
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StringBuilder sb = new StringBuilder();
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BufferedReader r = new BufferedReader(new FileReader(file));
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String line = r.readLine();
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while(line != null) {
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sb.append(line);
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line = r.readLine();
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}
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r.close();
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return sb.toString();
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}
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public Entity entityFromFile(File file) throws ClassNotFoundException, FileNotFoundException, IOException {
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String json = readFromFile(file);
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Gson gson = new Gson();
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return gson.fromJson(json, typeFromName(typeNameFromPath(file)).getType());
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}
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private String typeNameFromPath(File file) {
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String[] parts = file.getPath().split(App.getRs(Server.RB_SLASH));
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return parts[parts.length-2];
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}
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@Override
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public Object write(Entity e, boolean overwrite) {
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try {
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return writeToFile(e, overwrite);
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} catch (IOException ex) {
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logger.log(Level.SEVERE, null, ex);
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return null;
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}
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}
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@Override
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public Entity read(String typ, String name) {
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try {
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return entityFromFile(getFile(typ, name));
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} catch (ClassNotFoundException | IOException ex) {
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logger.log(Level.SEVERE, null, ex);
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return null;
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}
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}
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@Override
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public List<String> list(String typ) {
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File base = new File(fileBase);
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File dir = new File(base, typ);
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List<String> list = new ArrayList();
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File[] files = dir.listFiles();
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if(files != null) {
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for(File file : files) {
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//NamedItem n = new NamedItem();
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//n.setLabel(file.getName());
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list.add(file.getName());
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}
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}
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return list;
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}
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@Override
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public TypeToken typeFromName(String name) {
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return types.get(name);
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}
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@Override
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public String readJson(String typ, String name) {
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try {
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return readFromFile(getFile(typ, name));
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} catch (IOException ex) {
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logger.log(Level.SEVERE, null, ex);
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return null;
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}
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}
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private File getFile(String typ, String name) {
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File base = new File(fileBase);
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File dir = new File(base, typ);
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return new File(dir, name);
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}
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@Override
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public boolean delete(String typ, String name) {
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File file = getFile(typ, name);
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if(file.exists()) {
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return file.delete();
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} else {
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return false;
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}
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}
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}
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