/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jackrabbit.oak.plugins.mongomk.blob.gridfs;
import com.mongodb.BasicDBObject;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
/**
* {@code Command} for {@code MongoMicroKernel#getLength(String)}
*/
public class GetBlobLengthCommandGridFS extends BaseCommand<Long> {
private final String blobId;
private final GridFS gridFS;
/**
* Constructs the command.
*
* @param gridFS GridFS instance.
* @param blobId Blob id.
*/
public GetBlobLengthCommandGridFS(GridFS gridFS, String blobId) {
super();
this.blobId = blobId;
this.gridFS = gridFS;
}
@Override
public Long execute() throws Exception {
GridFSDBFile gridFSDBFile = gridFS.findOne(new BasicDBObject("md5", blobId));
if (gridFSDBFile == null) {
throw new Exception("Blob does not exist");
}
return gridFSDBFile.getLength();
}
}