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package design.persistence;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.module.SimpleModule;
import design.model.Course;
import design.model.Golfer;
import design.model.League;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class JSONPersonalDatabase implements PersonalDatabase {
private static JSONPersonalDatabase INSTANCE;
public static JSONPersonalDatabase instance() {
if (INSTANCE == null) {
INSTANCE = new JSONPersonalDatabase("data/personaldb.json");
}
return INSTANCE;
}
// static instance strictly for testing, to not add data to personaldb.json
static JSONPersonalDatabase testInstance(String filename) {
INSTANCE = new JSONPersonalDatabase(filename);
return INSTANCE;
}
private final Map<String, Golfer> cache;
private final ObjectMapper mapper;
private final File file;
private JSONPersonalDatabase(String filename) {
this.file = new File(filename);
this.cache = new HashMap<>();
this.mapper = new ObjectMapper();
Serializers.configureMapper(mapper);
mapper.registerModule(this.getJacksonModule());
try {
load();
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
private void load() throws IOException {
Golfer[] data = mapper.readValue(file, Golfer[].class);
cache.clear();
for (Golfer i : data) {
cache.put(i.getUsername(), i);
}
}
private void save() throws IOException {
Golfer[] data = cache.values().toArray(Golfer[]::new);
mapper.writer(new Serializers.CustomPrettyPrinter()).writeValue(file, data);
}
// turns that collection into a real array of golfers
@Override
public Golfer[] getGolfers() {
return cache.values().toArray(Golfer[]::new);
}
@Override
public Golfer getGolfer(String username) {
return cache.get(username);
}
@Override
public void addGolfer(Golfer golfer) throws IOException {
cache.putIfAbsent(golfer.getUsername(), golfer);
save();
}
@Override
public void removeGolfer(Golfer golfer) throws IOException {
cache.remove(golfer.getUsername());
save();
}
@Override
public void updateGolfer(Golfer golfer) throws IOException {
cache.put(golfer.getUsername(), golfer);
save();
}
@Override
public void importData(Object rawData) throws IOException {
if (!(rawData instanceof Golfer[] data)) {
throw new ClassCastException();
}
cache.clear();
for (Golfer golfer : data) {
cache.put(golfer.getUsername(), golfer);
}
save();
}
@Override
public Golfer[] exportData() {
return getGolfers();
}
@Override
public SimpleModule getJacksonModule() {
SimpleModule module = new SimpleModule();
module.addDeserializer(Course.class, new Serializers.CourseIdDeserializer());
module.addSerializer(Course.class, new Serializers.CourseIdSerializer());
module.addSerializer(League.class, new Serializers.LeagueIDSerializer());
module.addDeserializer(League.class, new Serializers.LeagueIDDeserializer());
return module;
}
@Override
public Class<?> getTargetClass() {
return Golfer[].class;
}
}
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