org.chimi.s4s.metainfo.mongo.MongoMetaInfoDao.java Source code

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Here is the source code for org.chimi.s4s.metainfo.mongo.MongoMetaInfoDao.java

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/*
 * Copyright 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.chimi.s4s.metainfo.mongo;

import javax.annotation.PostConstruct;

import org.chimi.s4s.metainfo.FileMetadata;
import org.chimi.s4s.metainfo.MetaInfoDao;

import com.mongodb.BasicDBObjectBuilder;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.Mongo;
import com.mongodb.util.JSON;

/**
 * MongoDB metainfo DAO
 *
 * @author Lee Kyu Hwa
 * @version 2011. 1. 10.
 */
public class MongoMetaInfoDao implements MetaInfoDao {

    private DB db;
    private DBCollection dbCollection;

    private Mongo mongo;
    private String dbName;
    private String collectionName;

    public void setMongo(Mongo mongo) {
        this.mongo = mongo;
    }

    public void setDbName(String dbName) {
        this.dbName = dbName;
    }

    @PostConstruct
    public void init() {
        db = mongo.getDB(dbName);
        dbCollection = db.getCollection(collectionName);
    }

    public void setDb(DB db) {
        this.db = db;
    }

    public void setCollectionName(String collectionName) {
        this.collectionName = collectionName;
    }

    public void setDbCollection(DBCollection dbCollection) {
        this.dbCollection = dbCollection;
    }

    @Override
    public String insert(FileMetadata metadata) throws IllegalArgumentException {
        DBObject dbObject = getDbObject(new MongoFileMetadata(metadata));
        dbCollection.save(dbObject);
        return dbObject.get("_id").toString();
    }

    @Override
    public FileMetadata selectByFileId(String fileId) {
        DBObject q = BasicDBObjectBuilder.start().add("FILE_ID", fileId).get();
        DBObject doc = dbCollection.findOne(q);

        return convertMetaInfo(doc);
    }

    /**
     * @param doc
     * @return
     */
    private FileMetadata convertMetaInfo(DBObject doc) {
        if (doc == null) {
            return null;
        } else {
            MongoFileMetadata meta = new MongoFileMetadata();
            meta.setFileId((String) doc.get("FILE_ID"));
            meta.setFileName((String) doc.get("FILE_NAME"));
            meta.setId(doc.get("_id").toString());
            meta.setLength(Long.parseLong(doc.get("FILE_LENGTH").toString()));
            meta.setMimetype((String) doc.get("MIMETYPE"));
            meta.setServiceId((String) doc.get("SERVICE_ID"));
            meta.setUploadTime(doc.get("UPLOAD_TIME").toString());
            return meta;
        }
    }

    /**
     * @param metadata
     * @return
     */
    private DBObject getDbObject(MongoFileMetadata metadata) {
        DBObject dbObject = (DBObject) JSON.parse(metadata.toString());
        return dbObject;
    }
}