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package com.earth2me.essentials.storage;
import java.io.PrintWriter;
import java.io.Reader;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.TypeDescription;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;
public class StorageObject
{
protected Class<? extends StorageObject> clazz;
protected StorageObject()
{
}
private static Map<Class, Constructor> constructors = new HashMap<Class, Constructor>();
public static <T extends StorageObject> T load(Class<? extends T> clazz, Reader reader)
{
Constructor constructor;
if (constructors.containsKey(clazz))
{
constructor = constructors.get(clazz);
}
else
{
constructor = prepareConstructor(clazz);
constructors.put(clazz, constructor);
}
final Yaml yaml = new Yaml(constructor);
T ret = (T)yaml.load(reader);
if (ret == null)
{
try
{
ret = (T)clazz.newInstance();
}
catch (InstantiationException ex)
{
Logger.getLogger(StorageObject.class.getName()).log(Level.SEVERE, null, ex);
}
catch (IllegalAccessException ex)
{
Logger.getLogger(StorageObject.class.getName()).log(Level.SEVERE, null, ex);
}
}
ret.clazz = clazz;
return ret;
}
private static Constructor prepareConstructor(final Class<?> clazz)
{
final Constructor constructor = new Constructor(clazz);
final Set<Class> classes = new HashSet<Class>();
prepareConstructor(constructor, classes, clazz);
return constructor;
}
private static 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())
{
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());
}
}
final MapType mapType = field.getAnnotation(MapType.class);
if (mapType != null)
{
description.putMapPropertyType(field.getName(), String.class, mapType.value());
if (StorageObject.class.isAssignableFrom(mapType.value())
&& !classes.contains(mapType.value()))
{
prepareConstructor(constructor, classes, mapType.value());
}
}
if (StorageObject.class.isAssignableFrom(field.getType())
&& !classes.contains(field.getType()))
{
prepareConstructor(constructor, classes, field.getType());
}
}
constructor.addTypeDescription(description);
}
private transient Yaml yaml;
public void save(final PrintWriter writer)
{
final DumperOptions ops = new DumperOptions();
yaml = new Yaml(ops);
try
{
writeToFile(this, writer, 0, clazz);
}
catch (IllegalArgumentException ex)
{
Logger.getLogger(StorageObject.class.getName()).log(Level.SEVERE, null, ex);
}
catch (IllegalAccessException ex)
{
Logger.getLogger(StorageObject.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void writeToFile(final Object object, final PrintWriter writer, final int depth, final Class clazz) throws IllegalArgumentException, IllegalAccessException
{
for (Field field : clazz.getDeclaredFields())
{
final int modifier = field.getModifiers();
if (Modifier.isPrivate(modifier) && !Modifier.isTransient(depth) && !Modifier.isStatic(depth))
{
field.setAccessible(true);
final boolean commentPresent = field.isAnnotationPresent(Comment.class);
final String name = field.getName();
if (commentPresent)
{
final Comment comments = field.getAnnotation(Comment.class);
for (String comment : comments.value())
{
final String trimmed = comment.trim();
if (trimmed.isEmpty())
{
continue;
}
writeIndention(writer, depth);
writer.print("# ");
writer.print(trimmed);
writer.println();
}
}
final Object data = field.get(object);
if (data == null && !commentPresent)
{
continue;
}
writeIndention(writer, depth);
if (data == null && commentPresent)
{
writer.print('#');
}
writer.print(name);
writer.print(": ");
if (data == null && commentPresent)
{
writer.println();
continue;
}
if (data instanceof StorageObject)
{
writer.println();
writeToFile(data, writer, depth + 1, data.getClass());
}
else if (data instanceof Map)
{
writer.println();
for (Entry<String, Object> entry : ((Map<String, Object>)data).entrySet())
{
final Object value = entry.getValue();
if (value != null)
{
writeIndention(writer, depth + 1);
writer.print(entry.getKey());
writer.print(": ");
if (value instanceof StorageObject)
{
writer.println();
writeToFile(value, writer, depth + 2, value.getClass());
}
else if (value instanceof String || value instanceof Boolean || value instanceof Number)
{
yaml.dumpAll(Collections.singletonList(value).iterator(), writer);
}
else
{
throw new UnsupportedOperationException();
}
}
}
}
else if (data instanceof Collection)
{
writer.println();
for (Object entry : (Collection<Object>)data)
{
if (entry != null)
{
writeIndention(writer, depth + 1);
writer.print("- ");
if (entry instanceof String || entry instanceof Boolean || entry instanceof Number)
{
yaml.dumpAll(Collections.singletonList(entry).iterator(), writer);
}
else
{
throw new UnsupportedOperationException();
}
}
}
}
else if (data instanceof String || data instanceof Boolean || data instanceof Number)
{
yaml.dumpAll(Collections.singletonList(data).iterator(), writer);
}
else
{
throw new UnsupportedOperationException();
}
}
}
}
private void writeIndention(final PrintWriter writer, final int depth)
{
for (int i = 0; i < depth; i++)
{
writer.print(" ");
}
}
}
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