package org.nutz.mongo.entity;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.bson.types.ObjectId;
import org.nutz.lang.Lang;
import org.nutz.lang.util.NutMap;
import org.nutz.mongo.Mongos;
import com.mongodb.DBObject;
/**
* 动态 MongoEntity 负责将一个 Map 与 DBObject，它向自己的子类提供一些帮助函数，子类将对象变成 Map 后调用
* <p>
* 与 MongoDB 默认设置不同，本类默认的，会为 _id 字段填充 UU64
*
* @author zozoh(zozohtnt@gmail.com)
* @param <T>
*/
public class DynamicMongoEntity implements MongoEntity {
public String getFieldDbName(String key) {
return key;
}
@Override
public long getCappedSize() {
return -1;
}
@Override
public long getCappedMax() {
return -1;
}
@Override
public String getCollectionName(Object ref) {
NutMap map = Mongos.obj2map(ref);
return map.get(Mongos.COLLECTION_KEY).toString();
}
@Override
public boolean hasIndexes() {
return false;
}
@Override
public List<MongoEntityIndex> getIndexes() {
return new LinkedList<MongoEntityIndex>();
}
@Override
public DBObject formatObject(Object o) {
return Mongos.obj2dbo(o);
}
@Override
public DBObject toDBObject(Object obj) {
return Mongos.obj2dbo(obj);
}
@Override
public Object toObject(DBObject dbo) {
if (null == dbo)
return null;
NutMap map = new NutMap();
for (String key : dbo.keySet()) {
Object dbval = dbo.get(key);
if (dbval instanceof ObjectId)
map.put(key, dbval.toString());
else
map.put(key, dbval);
}
return map;
}
@SuppressWarnings({"unchecked", "rawtypes"})
@Override
public void fillId(Object obj) {
if (null != obj && obj instanceof Map) {
((Map) obj).put("_id", new ObjectId());
return;
}
throw _failToFill(obj);
}
@SuppressWarnings({"unchecked", "rawtypes"})
@Override
public void fillIdIfNoexits(Object obj) {
if (null != obj && obj instanceof Map) {
if (!((Map) obj).containsKey("_id"))
((Map) obj).put("_id", new ObjectId());
return;
}
throw _failToFill(obj);
}
private RuntimeException _failToFill(Object obj) {
return Lang.makeThrow( "Can only fillId to Map<String,Object> but it is '%s'",
obj.getClass().getName());
}
}