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