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PersistenceLoader.java
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PersistenceLoader.java
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package net.citizensnpcs.api.persistence;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.WeakHashMap;
import org.bukkit.Location;
import org.bukkit.inventory.ItemStack;
import org.bukkit.util.EulerAngle;
import com.google.common.collect.Collections2;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import com.google.common.primitives.Primitives;
import net.citizensnpcs.api.util.DataKey;
/**
* Performs reflective persistence of objects into {@link DataKey}s. {@link Persist} annotations are used to mark fields
* for annotation.
*
* @see Persist
*/
public class PersistenceLoader {
private static class PersistenceLoaderPersister implements Persister<Object> {
private final Class<?> clazz;
private PersistenceLoaderPersister(Class<?> clazz) {
this.clazz = clazz;
}
@Override
public Object create(DataKey root) {
return PersistenceLoader.load(clazz, root);
}
@Override
public void save(Object instance, DataKey root) {
PersistenceLoader.save(instance, root);
}
}
private static class PersistField {
private final Persister<?> delegate;
private final Field field;
private final String key;
private final Persist persistAnnotation;
private PersistField(Field field) {
this.field = field;
this.persistAnnotation = field.getAnnotation(Persist.class);
this.key = persistAnnotation.value().equals("UNINITIALISED") ? field.getName() : persistAnnotation.value();
Class<?> fallback = field.getType();
if (field.getGenericType() instanceof ParameterizedType) {
int index = Map.class.isAssignableFrom(field.getType()) ? 1 : 0;
fallback = (Class<?>) ((ParameterizedType) field.getGenericType()).getActualTypeArguments()[index];
}
this.delegate = persistAnnotation.reify() ? new PersistenceLoaderPersister(fallback) : getDelegate(field, fallback);
}
@SuppressWarnings("unchecked")
public <T> T get(Object instance) {
try {
return (T) field.get(instance);
} catch (Exception e) {
e.printStackTrace();
return (T) NULL;
}
}
public Class<?> getCollectionType() {
return persistAnnotation.collectionType();
}
public DataKey getDataKey(DataKey root) {
if (Modifier.isStatic(field.getModifiers())) {
if (persistAnnotation.namespace().isEmpty()) {
throw new IllegalArgumentException("Missing @Persist namespace for " + field);
}
return root.getFromRoot("global." + persistAnnotation.namespace());
}
return root;
}
public Class<?> getType() {
return field.getType();
}
public boolean isRequired() {
return persistAnnotation.required();
}
public void set(Object instance, Object value) {
try {
field.set(instance, value);
} catch (Exception e) {
e.printStackTrace();
}
}
private static final Object NULL = new Object();
}
public static <T> PersisterRegistry<T> createRegistry(Class<?> base) {
PersisterRegistry<T> registry = new PersisterRegistry<T>();
registries.put(base, registry);
return registry;
}
private static String createRelativeKey(String key, int ext) {
return createRelativeKey(key, Integer.toString(ext));
}
private static String createRelativeKey(String parent, String ext) {
if (ext.isEmpty())
return parent;
if (ext.charAt(0) == '.')
return parent.isEmpty() ? ext.substring(1, ext.length()) : parent + ext;
return parent.isEmpty() ? ext : parent + '.' + ext;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static void deserialise(PersistField field, Object instance, Object oldValue, DataKey root)
throws Exception {
Object value;
Class<?> type = field.getType();
Class<?> collectionType = field.getCollectionType();
// TODO: this is pretty ugly.
if (!Collection.class.isAssignableFrom(collectionType) && !Map.class.isAssignableFrom(collectionType))
throw loadException;
if (List.class.isAssignableFrom(type)) {
List<Object> list = (List<Object>) (!List.class.isAssignableFrom(collectionType) ? Lists.newArrayList()
: collectionType.newInstance());
Object raw = root.getRaw(field.key);
if (raw instanceof List && collectionType.isAssignableFrom(raw.getClass())) {
list = (List<Object>) raw;
} else {
deserialiseCollection(list, root, field);
}
value = list;
} else if (Set.class.isAssignableFrom(type)) {
Set set;
if (Set.class.isAssignableFrom(collectionType)) {
set = (Set) collectionType.newInstance();
} else {
if (field.getType().isEnum()) {
set = EnumSet.noneOf((Class<? extends Enum>) field.getType());
} else {
set = (Set) (oldValue != null && Set.class.isAssignableFrom(oldValue.getClass())
? oldValue.getClass().newInstance()
: Sets.newHashSet());
}
}
Object raw = root.getRaw(field.key);
if (raw instanceof Set && collectionType.isAssignableFrom(raw.getClass())) {
set = (Set) raw;
} else
deserialiseCollection(set, root, field);
value = set;
} else if (Map.class.isAssignableFrom(type)) {
Map<Object, Object> map;
if (Map.class.isAssignableFrom(collectionType)) {
map = (Map<Object, Object>) collectionType.newInstance();
} else {
boolean hasConcreteType = oldValue != null && Map.class.isAssignableFrom(oldValue.getClass())
&& !oldValue.getClass().isInterface();
map = (Map<Object, Object>) (hasConcreteType ? oldValue : Maps.newHashMap());
}
deserialiseMap(map, root, field);
value = map;
} else if (float[].class.isAssignableFrom(type)) {
List<Float> floats = Lists.newArrayList();
for (DataKey sub : root.getRelative(field.key).getIntegerSubKeys()) {
floats.add((float) sub.getDouble(""));
}
value = new float[floats.size()];
for (int i = 0; i < floats.size(); i++) {
((float[]) value)[i] = floats.get(i);
}
} else if (double[].class.isAssignableFrom(type)) {
List<Double> doubles = Lists.newArrayList();
for (DataKey sub : root.getRelative(field.key).getIntegerSubKeys()) {
doubles.add(sub.getDouble(""));
}
value = new double[doubles.size()];
for (int i = 0; i < doubles.size(); i++) {
((double[]) value)[i] = doubles.get(i);
}
} else if (int[].class.isAssignableFrom(type)) {
List<Integer> ints = Lists.newArrayList();
for (DataKey sub : root.getRelative(field.key).getIntegerSubKeys()) {
ints.add(sub.getInt(""));
}
value = new int[ints.size()];
for (int i = 0; i < ints.size(); i++) {
((int[]) value)[i] = ints.get(i);
}
} else
value = deserialiseValue(field, root.getRelative(field.key));
if (value == null && field.isRequired())
throw loadException;
if (type.isPrimitive() || Primitives.isWrapperType(type)) {
if (value == null)
return;
if (!Primitives.isWrapperType(type)) {
type = Primitives.wrap(type);
}
Class<?> clazz = value.getClass();
if (clazz == Integer.class && type != Integer.class && type != Double.class && type != Long.class
&& type != Float.class) {
return;
}
if (clazz == Float.class && type != Double.class && type != Float.class) {
return;
}
if (clazz == Double.class && type != Double.class) {
if (type == Float.class) {
value = ((Double) value).floatValue();
} else {
return;
}
}
if (clazz == Byte.class && type != Short.class && type != Byte.class && type != Integer.class
&& type != Double.class && type != Long.class && type != Float.class) {
return;
}
if (clazz == Short.class && type != Short.class && type != Integer.class && type != Double.class
&& type != Long.class && type != Float.class) {
return;
}
if (clazz == Character.class && type != Character.class && type != Short.class && type != Integer.class
&& type != Double.class && type != Long.class && type != Float.class) {
return;
}
field.set(instance, value);
} else {
if (value != null && !type.isAssignableFrom(value.getClass()))
return;
field.set(instance, value);
}
}
private static void deserialiseCollection(Collection<Object> collection, DataKey root, PersistField field) {
for (DataKey subKey : root.getRelative(field.key).getSubKeys()) {
Object loaded = deserialiseCollectionValue(field, subKey, field.persistAnnotation.valueType());
if (loaded == null)
continue;
collection.add(loaded);
}
}
private static Object deserialiseCollectionValue(PersistField field, DataKey subKey, Class<?> type) {
Object deserialised = deserialiseValue(field, subKey);
if (deserialised == null || type == Object.class)
return deserialised;
Class<?> clazz = deserialised.getClass();
if (type.isPrimitive() || Primitives.isWrapperType(type)) {
if (!Primitives.isWrapperType(clazz)) {
clazz = Primitives.wrap(clazz);
}
if (type != clazz) {
if (type == Long.class) {
return ((Number) deserialised).longValue();
}
if (type == Byte.class) {
return ((Number) deserialised).byteValue();
}
if (type == Short.class) {
return ((Number) deserialised).shortValue();
}
if (type == Float.class) {
return ((Number) deserialised).floatValue();
}
if (type == Double.class) {
return ((Number) deserialised).doubleValue();
}
if (type == Integer.class) {
return ((Number) deserialised).intValue();
}
}
}
return deserialised;
}
private static void deserialiseMap(Map<Object, Object> map, DataKey root, PersistField field) {
for (DataKey subKey : root.getRelative(field.key).getSubKeys()) {
Object loaded = deserialiseCollectionValue(field, subKey, field.persistAnnotation.valueType());
if (loaded == null)
continue;
Object key = subKey.name();
Class<?> type = field.persistAnnotation.keyType();
if (type != String.class) {
if (type.isPrimitive() || Primitives.isWrapperType(type)) {
if (type == Long.class) {
key = Long.parseLong(String.valueOf(key));
}
if (type == Byte.class) {
key = Byte.parseByte(String.valueOf(key));
}
if (type == Short.class) {
key = Short.parseShort(String.valueOf(key));
}
if (type == Float.class) {
key = Float.parseFloat(String.valueOf(key));
}
if (type == Double.class) {
key = Double.parseDouble(String.valueOf(key));
}
if (type == Integer.class) {
key = Integer.parseInt(String.valueOf(key));
}
} else if (type == UUID.class) {
key = UUID.fromString(String.valueOf(key));
} else {
throw new UnsupportedOperationException();
}
}
map.put(key, loaded);
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static Object deserialiseValue(PersistField field, DataKey root) {
Class<?> type = field.field.getType().isEnum() ? field.field.getType() : getGenericType(field.field);
if (field.delegate == null && type.isEnum()) {
Class<? extends Enum> clazz = (Class<? extends Enum>) type;
Object obj = root.getRaw("");
if (obj instanceof String) {
try {
return Enum.valueOf(clazz, obj.toString());
} catch (IllegalArgumentException e) {
// fallback to default
}
}
}
Object deserialised = field.delegate == null ? root.getRaw("") : field.delegate.create(root);
return deserialised;
}
private static void ensureDelegateLoaded(Class<? extends Persister<?>> delegateClass) {
if (loadedDelegates.containsKey(delegateClass))
return;
try {
Constructor<? extends Persister<?>> constructor = delegateClass.getConstructor();
constructor.setAccessible(true);
loadedDelegates.put(delegateClass, constructor.newInstance());
} catch (Exception e) {
e.printStackTrace();
loadedDelegates.put(delegateClass, null);
}
}
private static Persister<?> getDelegate(Field field, Class<?> fallback) {
DelegatePersistence delegate = field.getAnnotation(DelegatePersistence.class);
Persister<?> persister;
if (delegate == null) {
if (registries.containsKey(fallback))
return registries.get(fallback);
return loadedDelegates.get(persistRedirects.get(fallback));
}
persister = loadedDelegates.get(delegate.value());
return persister == null ? loadedDelegates.get(persistRedirects.get(fallback)) : persister;
}
private static PersistField[] getFields(Class<?> clazz) {
PersistField[] fields = fieldCache.get(clazz);
if (fields == null) {
fieldCache.put(clazz, fields = getFieldsFromClass(clazz));
}
return fields;
}
private static PersistField[] getFieldsFromClass(Class<?> clazz) {
List<Field> toFilter = Lists.newArrayList(clazz.getDeclaredFields());
Class<?> superClass = clazz.getSuperclass();
while (superClass != Object.class && superClass != null) {
toFilter.addAll(Arrays.asList(superClass.getDeclaredFields()));
superClass = superClass.getSuperclass();
}
Iterator<Field> itr = toFilter.iterator();
while (itr.hasNext()) {
Field field = itr.next();
field.setAccessible(true);
Persist persistAnnotation = field.getAnnotation(Persist.class);
if (persistAnnotation == null) {
itr.remove();
continue;
}
DelegatePersistence delegate = field.getAnnotation(DelegatePersistence.class);
if (delegate == null)
continue;
Class<? extends Persister<?>> delegateClass = delegate.value();
ensureDelegateLoaded(delegateClass);
Persister<?> in = loadedDelegates.get(delegateClass);
if (in == null) {
// class couldn't be loaded earlier, we can't deserialise.
itr.remove();
continue;
}
}
return Collections2.transform(toFilter, (a) -> new PersistField(a)).toArray(new PersistField[toFilter.size()]);
}
private static Class<?> getGenericType(Field field) {
if (field.getGenericType() == null || !(field.getGenericType() instanceof ParameterizedType))
return field.getType();
Type[] args = ((ParameterizedType) field.getGenericType()).getActualTypeArguments();
return args.length > 0 && args[0] instanceof Class ? (Class<?>) args[0] : field.getType();
}
/**
* Creates an instance of the given class using the default constructor and loads it using
* {@link #load(Object, DataKey)}. Will return null if an exception occurs.
*
* @see #load(Object, DataKey)
* @param clazz
* The class to create an instance from
* @param root
* The root key to load from
* @return The loaded instance
*/
@SuppressWarnings("unchecked")
public static <T> T load(Class<? extends T> clazz, DataKey root) {
T instance = null;
try {
for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
if (constructor.getParameterCount() == 0) {
constructor.setAccessible(true);
instance = (T) constructor.newInstance();
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
if (instance == null)
return null;
return load(instance, root);
}
/**
* Analyses the class for {@link Field}s with the {@link Persist} annotation and loads data into them using the
* given {@link DataKey}. If a {@link DelegatePersistence} annotation is provided the referenced {@link Persister}
* will be used to create the instance. This annotation can be omitted if the Persister has been registered using
* {@link #registerPersistDelegate(Class, Class)}
*
* @param instance
* The instance to load data into
* @param root
* The key to load data from
* @return The instance, with persisted fields loaded
*/
public static <T> T load(T instance, DataKey root) {
Class<?> clazz = instance.getClass();
PersistField[] fields = getFields(clazz);
for (PersistField field : fields) {
try {
deserialise(field, instance, field.get(instance), field.getDataKey(root));
} catch (Exception e) {
if (e != loadException) {
e.printStackTrace();
}
return null;
}
}
if (instance instanceof Persistable) {
((Persistable) instance).load(root);
}
return instance;
}
/**
* Registers a {@link Persister} redirect. Fields with the {@link Persist} annotation with a type that has been
* registered using this method will use the Persister by default to load and save data. The
* {@link DelegatePersistence} annotation will be preferred if present.
*
* @param clazz
* The class to redirect
* @param delegateClass
* The Persister class to use when loading and saving
*/
public static void registerPersistDelegate(Class<?> clazz, Class<? extends Persister<?>> delegateClass) {
persistRedirects.put(clazz, delegateClass);
ensureDelegateLoaded(delegateClass);
}
/**
* Scans the object for fields annotated with {@link Persist} and saves them to the given {@link DataKey}.
*
* @param instance
* The instance to save
* @param root
* The key to save into
*/
public static void save(Object instance, DataKey root) {
Class<?> clazz = instance.getClass();
PersistField[] fields = getFields(clazz);
for (PersistField field : fields) {
serialise(field, field.get(instance), field.getDataKey(root));
}
if (instance instanceof Persistable) {
((Persistable) instance).save(root);
}
}
private static void serialise(PersistField field, Object fieldValue, DataKey root) {
if (fieldValue == null)
return;
if (Collection.class.isAssignableFrom(field.getType())) {
Collection<?> collection = (Collection<?>) fieldValue;
root.removeKey(field.key);
int i = 0;
for (Object object : collection) {
String key = createRelativeKey(field.key, i);
serialiseValue(field, root.getRelative(key), object);
i++;
}
} else if (Map.class.isAssignableFrom(field.getType())) {
@SuppressWarnings("unchecked")
Map<Object, Object> map = (Map<Object, Object>) fieldValue;
root.removeKey(field.key);
for (Map.Entry<Object, Object> entry : map.entrySet()) {
String key = createRelativeKey(field.key, String.valueOf(entry.getKey()));
serialiseValue(field, root.getRelative(key), entry.getValue());
}
} else if (float[].class.isAssignableFrom(field.getType())) {
float[] floats = (float[]) fieldValue;
root.removeKey(field.key);
for (int i = 0; i < floats.length; i++) {
String key = createRelativeKey(field.key, i);
serialiseValue(field, root.getRelative(key), floats[i]);
}
} else if (double[].class.isAssignableFrom(field.getType())) {
double[] doubles = (double[]) fieldValue;
root.removeKey(field.key);
for (int i = 0; i < doubles.length; i++) {
String key = createRelativeKey(field.key, i);
serialiseValue(field, root.getRelative(key), doubles[i]);
}
} else if (int[].class.isAssignableFrom(field.getType())) {
int[] ints = (int[]) fieldValue;
root.removeKey(field.key);
for (int i = 0; i < ints.length; i++) {
String key = createRelativeKey(field.key, i);
serialiseValue(field, root.getRelative(key), ints[i]);
}
} else {
serialiseValue(field, root.getRelative(field.key), fieldValue);
}
}
@SuppressWarnings("unchecked")
private static void serialiseValue(PersistField field, DataKey root, Object value) {
if (field.delegate != null) {
((Persister<Object>) field.delegate).save(value, root);
} else if (value instanceof Enum) {
root.setRaw("", ((Enum<?>) value).name());
} else {
root.setRaw("", value);
}
}
private static final Map<Class<?>, PersistField[]> fieldCache = new WeakHashMap<Class<?>, PersistField[]>();
private static final Map<Class<? extends Persister<?>>, Persister<?>> loadedDelegates = new WeakHashMap<Class<? extends Persister<?>>, Persister<?>>();
private static final Exception loadException = new Exception() {
@SuppressWarnings("unused")
public void fillInStackTrace(StackTraceElement[] elements) {
}
private static final long serialVersionUID = -4245839150826112365L;
};
private static final Map<Class<?>, Class<? extends Persister<?>>> persistRedirects = new WeakHashMap<Class<?>, Class<? extends Persister<?>>>();
private static final Map<Class<?>, PersisterRegistry<?>> registries = new WeakHashMap<Class<?>, PersisterRegistry<?>>();
static {
registerPersistDelegate(Location.class, LocationPersister.class);
registerPersistDelegate(ItemStack.class, ItemStackPersister.class);
registerPersistDelegate(EulerAngle.class, EulerAnglePersister.class);
registerPersistDelegate(UUID.class, UUIDPersister.class);
}
}