@SuppressWarnings("unchecked")
public static <T1 extends Model, T2 extends Model> List<T2> getRelations(
Class<? extends OneToManyRelation<T1, T2>> relation, T1 entity) {
if (entity.getId() == null)
throw new IllegalArgumentException(
entity.getClass().getSimpleName() + " is not saved to database yet, aborting");
TableInfo crossTableInfo = Cache.getTableInfo(relation);
Cursor cursor =
Cache.openDatabase()
.rawQuery(
"SELECT entity2Type, entity2 FROM "
+ crossTableInfo.getTableName()
+ " WHERE entity1 = ?",
new String[] {entity.getId().toString()});
final List<T2> entities = new ArrayList<T2>();
try {
if (cursor.moveToFirst()) {
do {
String typeName = cursor.getString(0);
Class<? extends Model> entity2Class = (Class<? extends Model>) Class.forName(typeName);
entities.add((T2) Model.load(entity2Class, cursor.getLong(1)));
} while (cursor.moveToNext());
}
} catch (Exception e) {
Log.e("Failed to process cursor.", e);
throw new RuntimeException(e);
} finally {
cursor.close();
}
return entities;
}
public static <T1 extends Model, T2 extends Model> void setRelations(
Class<? extends OneToManyRelation<T1, T2>> relation, T1 entity1, List<T2> entities2) {
if (entity1.getId() == null)
throw new IllegalArgumentException(
entity1.getClass().getSimpleName() + " is not saved to database yet, aborting");
for (T2 entity2 : entities2) {
if (entity2.getId() == null)
throw new IllegalArgumentException(
entity2.getClass().getSimpleName() + " is not saved to database yet, aborting");
}
new Delete().from(relation).where("entity1 = ?", entity1.getId()).execute();
try {
List<OneToManyRelation<T1, T2>> connections = new ArrayList<OneToManyRelation<T1, T2>>();
for (T2 entity2 : entities2) {
OneToManyRelation<T1, T2> connection = relation.newInstance();
connection.entity1 = entity1;
connection.entity2Type = entity2.getClass().getCanonicalName();
connection.entity2 = entity2;
connections.add(connection);
}
saveMultiple(connections);
} catch (Exception e) {
Log.e("Cannot create instance of class " + relation.getSimpleName());
throw new RuntimeException(e);
}
}