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package net.ess3.storage;
import java.io.Reader;
import java.lang.reflect.Field;
import java.util.*;
import java.util.concurrent.locks.ReentrantLock;
import net.ess3.api.IPlugin;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
import org.yaml.snakeyaml.introspector.BeanAccess;
public class YamlStorageReader implements IStorageReader
{
private static final Map<Class<?>, Yaml> PREPARED_YAMLS = Collections.synchronizedMap(new HashMap<Class<?>, Yaml>());
private static final Map<Class<?>, ReentrantLock> LOCKS = new HashMap<Class<?>, ReentrantLock>();
private final Reader reader;
private final IPlugin plugin;
public YamlStorageReader(final Reader reader, final IPlugin plugin)
{
this.reader = reader;
this.plugin = plugin;
}
@Override
public <T extends StorageObject> T load(final Class<? extends T> clazz) throws ObjectLoadException
{
Yaml yaml = PREPARED_YAMLS.get(clazz);
if (yaml == null)
{
yaml = new Yaml(prepareConstructor(clazz));
yaml.setBeanAccess(BeanAccess.FIELD);
PREPARED_YAMLS.put(clazz, yaml);
}
ReentrantLock lock;
synchronized (LOCKS)
{
lock = LOCKS.get(clazz);
if (lock == null)
{
lock = new ReentrantLock();
}
}
lock.lock();
try
{
T object = (T)yaml.load(reader);
if (object == null)
{
object = clazz.newInstance();
}
return object;
}
catch (Exception ex)
{
throw new ObjectLoadException(ex);
}
finally
{
lock.unlock();
}
}
private Constructor prepareConstructor(final Class<?> clazz)
{
final Constructor constructor = new BukkitConstructor(clazz, plugin);
final Set<Class> classes = new HashSet<Class>();
prepareConstructor(constructor, classes, clazz);
return constructor;
}
private void prepareConstructor(final Constructor constructor, final Set<Class> classes, final Class clazz)
{
classes.add(clazz);
final TypeDescription description = new TypeDescription(clazz);
for (Field field : clazz.getDeclaredFields())
{
prepareList(field, description, classes, constructor);
prepareMap(field, description, classes, constructor);
if (StorageObject.class.isAssignableFrom(field.getType()) && !classes.contains(field.getType()))
{
prepareConstructor(constructor, classes, field.getType());
}
}
constructor.addTypeDescription(description);
}
private void prepareList(final Field field, final TypeDescription description, final Set<Class> classes, final Constructor constructor)
{
final ListType listType = field.getAnnotation(ListType.class);
if (listType != null)
{
description.putListPropertyType(field.getName(), listType.value());
if (StorageObject.class.isAssignableFrom(listType.value()) && !classes.contains(listType.value()))
{
prepareConstructor(constructor, classes, listType.value());
}
}
}
private void prepareMap(final Field field, final TypeDescription description, final Set<Class> classes, final Constructor constructor)
{
final MapValueType mapType = field.getAnnotation(MapValueType.class);
if (mapType != null)
{
final MapKeyType mapKeyType = field.getAnnotation(MapKeyType.class);
description.putMapPropertyType(
field.getName(), mapKeyType == null ? String.class : mapKeyType.value(), mapType.value());
if (StorageObject.class.isAssignableFrom(mapType.value()) && !classes.contains(mapType.value()))
{
prepareConstructor(constructor, classes, mapType.value());
}
}
}
}
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