Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.spleefleague.core.io; import com.google.common.collect.Iterables; import com.mongodb.client.MongoCollection; import com.spleefleague.core.SpleefLeague; import com.spleefleague.core.io.EntityBuilder.IOClass.Input; import com.spleefleague.core.io.EntityBuilder.IOClass.Output; import com.spleefleague.core.utils.collections.MapUtil; import org.bson.Document; import org.bson.types.ObjectId; import sun.reflect.ReflectionFactory; import java.lang.reflect.*; import java.util.*; /** * @author Jonas */ public class EntityBuilder { public static <T extends DBEntity & DBSaveable> void save(T object, MongoCollection<Document> dbcoll) { save(object, dbcoll, true); } public static <T extends DBEntity & DBSaveable> void save(T object, MongoCollection<Document> dbcoll, boolean override) { if (object == null) { return; } DBEntity dbe = (DBEntity) object; ObjectId _id = dbe.getObjectId(); Document index = null; if (override && _id != null) { index = new Document("_id", _id); } Document dbo = serialize(object); validate(dbo); if (index != null) { dbcoll.updateOne(index, dbo); } else { dbo = (Document) dbo.get("$set"); dbcoll.insertOne(dbo); _id = (ObjectId) dbcoll.find(dbo).first().get("_id"); try { Field _idField = DBEntity.class.getDeclaredField("_id"); _idField.setAccessible(true); _idField.set(dbe, _id); } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { e.printStackTrace(); } } } private static void validate(Document dbo) { Document unset = (Document) dbo.get("$unset"); if (unset != null) { if (unset.keySet().isEmpty()) { dbo.remove("$unset"); } } } public static void delete(DBEntity object, MongoCollection<Document> dbcoll) { dbcoll.deleteOne(new Document("_id", object.getObjectId())); } public static Document serialize(DBSaveable object) { try { Map<Integer, Map<String, Output>> outputs = getOutputs(object.getClass()); Document set = new Document(); Document unset = new Document(); Document query = new Document(); List<Integer> priorityList = new ArrayList<>(outputs.keySet()); Collections.sort(priorityList); for (Integer priority : priorityList) { Map<String, Output> priorityMap = outputs.get(priority); for (String name : priorityMap.keySet()) { Object o = priorityMap.get(name).get(object); if (o != null) { set.put(name, o); } else { unset.put(name, ""); } } } query.put("$set", set); query.put("$unset", unset); return query; } catch (Exception e) { e.printStackTrace(); } return null; } public static <T extends DBEntity & DBLoadable> T load(Document dbo, Class<T> c) { return deserialize(dbo, c); } public static <T> T deserialize(Document dbo, Class<T> c) { try { T t = null; try { t = c.newInstance(); } catch (InstantiationException | IllegalAccessException e) { t = createInstance(c); } Map<Integer, Map<String, Input>> inputs = getInputs(c); List<Integer> priorityList = new ArrayList<>(inputs.keySet()); Collections.sort(priorityList); for (Integer priority : priorityList) { Map<String, Input> priorityMap = inputs.get(priority); for (String name : priorityMap.keySet()) { if (dbo.containsKey(name)) { Input i = priorityMap.get(name); i.set(t, dbo.get(name)); } } } ((DBLoadable) t).done(); return t; } catch (Exception e) { e.printStackTrace(); } return null; } private static Map<Integer, Map<String, Input>> getInputs(Class c) { Map<Integer, Map<String, Input>> inputs = new HashMap<>(); Class current = c; while (current != null && current.isAssignableFrom(c)) { for (Method m : current.getDeclaredMethods()) { DBLoad dbload = m.getAnnotation(DBLoad.class); if (dbload != null) { Map<String, Input> map = inputs.get(dbload.priority()); if (map == null) { map = new HashMap<>(); inputs.put(dbload.priority(), map); } map.put(dbload.fieldName(), new Input(dbload.priority(), m)); } } for (Field f : current.getDeclaredFields()) { DBLoad dbload = f.getAnnotation(DBLoad.class); if (dbload != null) { Map<String, Input> map = inputs.get(dbload.priority()); if (map == null) { map = new HashMap<>(); inputs.put(dbload.priority(), map); } map.put(dbload.fieldName(), new Input(dbload.priority(), f)); } } current = current.getSuperclass(); } return inputs; } private static Map<Integer, Map<String, Output>> getOutputs(Class c) { Map<Integer, Map<String, Output>> outputs = new HashMap<>(); Class current = c; while (current != null && current.isAssignableFrom(c)) { for (Method m : current.getDeclaredMethods()) { DBSave dbsave = m.getAnnotation(DBSave.class); if (dbsave != null) { Map<String, Output> map = outputs.get(dbsave.priority()); if (map == null) { map = new HashMap<>(); outputs.put(dbsave.priority(), map); } map.put(dbsave.fieldName(), new Output(dbsave.priority(), m)); } } for (Field f : current.getDeclaredFields()) { DBSave dbsave = f.getAnnotation(DBSave.class); if (dbsave != null) { Map<String, Output> map = outputs.get(dbsave.priority()); if (map == null) { map = new HashMap<>(); outputs.put(dbsave.priority(), map); } map.put(dbsave.fieldName(), new Output(dbsave.priority(), f)); } } current = current.getSuperclass(); } return outputs; } public static <T> T createInstance(Class<T> clazz) { try { return clazz.newInstance(); } catch (InstantiationException | IllegalAccessException e) { return create(clazz, Object.class); } } private static <T> T create(Class<T> c, Class<? super T> parent) { try { ReflectionFactory rf = ReflectionFactory.getReflectionFactory(); Constructor objDef = parent.getDeclaredConstructor(); Constructor intConstr = rf.newConstructorForSerialization(c, objDef); return c.cast(intConstr.newInstance()); } catch (NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) { return null; } } public static abstract class IOClass implements Comparable<IOClass> { private final Method method; private final Field field; private final int priority; public IOClass(int priority, Field field) { this.field = field; this.field.setAccessible(true); this.priority = priority; this.method = null; } public IOClass(int priority, Method method) { this.method = method; this.method.setAccessible(true); this.priority = priority; this.field = null; } public boolean isMethod() { return method != null; } public boolean isField() { return field != null; } public int getPriority() { return priority; } @Override public int compareTo(IOClass o) { if (priority > o.getPriority()) { return -1; } else if (priority < o.getPriority()) { return 1; } else if (isField()) { return (o.isField()) ? 0 : -1; } else { return (o.isMethod()) ? 0 : 1; } } public static class Output extends IOClass { public Output(int priority, Field field) { super(priority, field); } public Output(int priority, Method method) { super(priority, method); } public Object get(Object instance) { if (isField()) { return getField(instance); } else { return getMethod(instance); } } private Object getField(Object instance) { try { Field f = super.field; Object o = f.get(instance); if (o == null) { return null; } if (o.getClass().isEnum()) { o = o.toString(); } else if (o.getClass().isArray()) { List list = new ArrayList<>(); Object[] array = (Object[]) o; if (!f.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = f.getAnnotation(DBSave.class).typeConverter().newInstance(); for (Object value : array) { list.add(tc.convertSave(value)); } } else { for (Object value : array) { if (DBSaveable.class.isAssignableFrom(f.getType().getComponentType())) { value = serialize((DBSaveable) value).get("$set"); } list.add(value); } } o = list; } else if (Collection.class.isAssignableFrom(f.getType())) { List list = new ArrayList<>(); Collection col = (Collection) o; if (!f.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = f.getAnnotation(DBSave.class).typeConverter().newInstance(); for (Object value : col) { list.add(tc.convertSave(value)); } } else { for (Object value : col) { Class c = f.getType().getComponentType(); if (c == null) { c = Iterables.getFirst((Collection) o, null).getClass(); //Dangerous, but if this doesn't work, nothing does. } if (DBSaveable.class.isAssignableFrom(c)) { value = serialize((DBSaveable) value).get("$set"); } list.add(value); } } o = list; } else if (!f.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = f.getAnnotation(DBSave.class).typeConverter().newInstance(); o = tc.convertSave(o); } else if (DBSaveable.class.isAssignableFrom(f.getType())) { o = serialize((DBSaveable) o).get("$set"); } return o; } catch (Exception e) { e.printStackTrace(); } return null; } private Object getMethod(Object instance) { try { Method m = super.method; Object o = m.invoke(instance); if (o == null) { return null; } if (m.getReturnType().isEnum()) { o = o.toString(); } else if (m.getReturnType().isArray()) { List list = new ArrayList<>(); Object[] array = (Object[]) o; if (!m.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = m.getAnnotation(DBSave.class).typeConverter().newInstance(); for (Object value : array) { list.add(tc.convertSave(value)); } } else { for (Object value : array) { if (DBSaveable.class.isAssignableFrom(m.getReturnType().getComponentType())) { value = serialize((DBSaveable) value).get("$set"); } list.add(value); } } o = list; } else if (Collection.class.isAssignableFrom(m.getReturnType())) { List list = new ArrayList<>(); Collection col = (Collection) o; Class generic = Object.class; if (m.getReturnType().getGenericInterfaces().length > 0) { generic = m.getReturnType().getGenericInterfaces()[0].getClass(); } if (!m.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = m.getAnnotation(DBSave.class).typeConverter().newInstance(); for (Object value : col) { list.add(tc.convertSave(value)); } } else { for (Object value : col) { if (DBSaveable.class.isAssignableFrom(generic)) { value = serialize((DBSaveable) value).get("$set"); } list.add(value); } } o = list; } else if (!m.getAnnotation(DBSave.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = m.getAnnotation(DBSave.class).typeConverter().newInstance(); o = tc.convertSave(o); } else if (DBSaveable.class.isAssignableFrom(m.getReturnType())) { o = serialize((DBSaveable) o).get("$set"); } return o; } catch (Exception e) { e.printStackTrace(); } return null; } } public static class Input extends IOClass { public Input(int priority, Field field) { super(priority, field); } public Input(int priority, Method method) { super(priority, method); } public void set(Object instance, Object value) { if (isField()) { setField(instance, value); } else { setMethod(instance, value); } } private void setField(Object instance, Object value) { Field f = super.field; try { if (f.getType().isEnum() && value instanceof String) { f.set(instance, Enum.valueOf((Class<Enum>) f.getType(), (String) value)); } else if (f.getType().isArray() && value instanceof List) { List list = (List) value; f.set(instance, loadArray(list, f.getType().getComponentType(), f.getAnnotation(DBLoad.class).typeConverter())); } else if (Collection.class.isAssignableFrom(f.getType()) && value instanceof List) { Class c = f.getType(); List list = (List) value; Collection col = loadCollection(list, c, (ParameterizedType) f.getGenericType(), f.getAnnotation(DBLoad.class).typeConverter()); f.set(instance, col); } else if (!f.getAnnotation(DBLoad.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = f.getAnnotation(DBLoad.class).typeConverter().newInstance(); f.set(instance, tc.convertLoad(value)); } else if (value instanceof Document && DBLoadable.class.isAssignableFrom(f.getType())) { f.set(instance, deserialize((Document) value, f.getType())); } else { f.set(instance, value); } } catch (Exception e) { String fName = "<unknown>"; if (f != null) { fName = f.getName(); } System.err.println( "EntityBuilder failed setting field: " + instance.getClass().getName() + "." + fName); } } private void setMethod(Object instance, Object value) { Method m = super.method; try { if (m.getParameterTypes()[0].isEnum() && value instanceof String) { m.invoke(instance, Enum.valueOf((Class<Enum>) m.getParameterTypes()[0], (String) value)); } else if (m.getParameterTypes()[0].isArray() && value instanceof List) { List list = (List) value; m.invoke(instance, loadArray(list, m.getParameterTypes()[0].getComponentType(), m.getAnnotation(DBLoad.class).typeConverter())); } else if (Collection.class.isAssignableFrom(m.getParameterTypes()[0]) && value instanceof List) { Class c = m.getParameterTypes()[0]; List list = (List) value; Collection col = loadCollection(list, c, (ParameterizedType) m.getGenericParameterTypes()[0], m.getAnnotation(DBLoad.class).typeConverter()); m.invoke(instance, col); } else if (!m.getAnnotation(DBLoad.class).typeConverter().equals(TypeConverter.class)) { TypeConverter tc = m.getAnnotation(DBLoad.class).typeConverter().newInstance(); m.invoke(instance, tc.convertLoad(value)); } else if (value instanceof Document && DBLoadable.class.isAssignableFrom(m.getParameterTypes()[0])) { m.invoke(instance, deserialize((Document) value, m.getParameterTypes()[0])); } else { m.invoke(instance, value); } } catch (Exception e) { String mName = "<unknown>"; if (m != null) { mName = m.getName(); } System.err.println( "EntityBuilder failed invoking method: " + instance.getClass().getName() + "." + mName); } } private static <T> Object loadArray(List data, Class<? extends T> type, Class<? extends TypeConverter> tcc) throws InstantiationException, IllegalAccessException { Object[] array = new Object[data.size()]; TypeConverter tc = tcc.equals(TypeConverter.class) ? null : tcc.newInstance(); for (int i = 0; i < data.size(); i++) { Object o = data.get(i); if (tc != null) { o = tc.convertLoad(o); } else if (o instanceof Document && DBLoadable.class.isAssignableFrom(type)) { o = deserialize((Document) o, type); } array[i] = o; } return createGenericArray(array, type); } private static <T extends Collection> T loadCollection(Collection list, Class<? extends T> type, ParameterizedType ptype, Class<? extends TypeConverter> tcc) throws InstantiationException, IllegalAccessException { Collection col = createCollectionInstance(type); for (Object o : list) { if (Collection.class.isAssignableFrom(o.getClass())) { o = loadCollection((Collection) o, (Class<? extends T>) ptype.getRawType(), (ParameterizedType) ptype.getActualTypeArguments()[0], tcc); } else if (!tcc.equals(TypeConverter.class)) { TypeConverter tc = tcc.newInstance(); o = tc.convertLoad(o); } else if (o instanceof Document) { if (DBLoadable.class.isAssignableFrom((Class) ptype.getActualTypeArguments()[0])) { o = deserialize((Document) o, (Class<? extends DBLoadable>) ptype.getActualTypeArguments()[0]); } } col.add(o); } return (T) col; } private static Object createGenericArray(Object[] values, Class<?> cast) { Object array = Array.newInstance(cast, values.length); if (!cast.isPrimitive()) { for (int i = 0; i < values.length; i++) { Object value = values[i]; ((Object[]) array)[i] = cast.cast(value); } } else if (cast == int.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { Number n = (Number) values[i]; int value = n.intValue(); ((int[]) array)[i] = value; } } else if (cast == long.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { Number n = (Number) values[i]; long value = n.longValue(); ((long[]) array)[i] = value; } } else if (cast == short.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { Number n = (Number) values[i]; short value = n.shortValue(); ((short[]) array)[i] = value; } } else if (cast == byte.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { Number n = (Number) values[i]; byte value = n.byteValue(); ((byte[]) array)[i] = value; } } else if (cast == char.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { char value = (char) values[i]; ((char[]) array)[i] = value; } } else if (cast == boolean.class) { array = new int[values.length]; for (int i = 0; i < values.length; i++) { boolean value = (boolean) values[i]; ((boolean[]) array)[i] = value; } } else { throw new RuntimeException("Unknown primitive: " + cast); } return array; } private static Collection createCollectionInstance(Class<? extends Collection> c) { if (Modifier.isInterface(c.getModifiers()) || Modifier.isAbstract(c.getModifiers())) { if (Set.class.isAssignableFrom(c)) { return new HashSet(); } else { return new ArrayList<>(); } } else { return createInstance(c); } } } } }