Example usage for com.mongodb.client.gridfs GridFSBucket delete

Introduction

In this page you can find the example usage for com.mongodb.client.gridfs GridFSBucket delete.

Prototype

void delete(BsonValue id);

Source Link

Document

Given a id , delete this stored file's files collection document and associated chunks from a GridFS bucket.

Usage

From source file:UnitTest3.java

License:Open Source License

public static void testgridfs4() throws FileNotFoundException, IOException {

    MongoClient mongo = new MongoClient("localhost", 27017);
    //DB db = mongo.getDB("JFileDB");
    MongoDatabase db = mongo.getDatabase("JFileDB");
    GridFSBucket gridFSBucket = GridFSBuckets.create(db);

    // Get the input stream
    InputStream streamToUploadFrom = new ByteArrayInputStream("Hello World".getBytes(StandardCharsets.UTF_8));

    // Create some custom options
    GridFSUploadOptions options = new GridFSUploadOptions().chunkSizeBytes(1024)
            .metadata(new Document("type", "file"));

    ObjectId fileId = gridFSBucket.uploadFromStream("test", streamToUploadFrom, options);
    streamToUploadFrom.close();/*from  ww w  . j a va 2s  .c om*/
    System.out.println("The fileId of the uploaded file is: " + fileId.toHexString());

    // Get some data to write
    byte[] data = "some data to upload into GridFS".getBytes(StandardCharsets.UTF_8);

    GridFSUploadStream uploadStream = gridFSBucket.openUploadStream("sample_data");
    uploadStream.write(data);
    uploadStream.close();
    System.out.println("The fileId of the uploaded file is: " + uploadStream.getFileId().toHexString());

    /*
    gridFSBucket.find().forEach(new Block<GridFSFile>() {
            
    public void apply(final GridFSFile gridFSFile) {
        System.out.println(gridFSFile.getFilename());
    }
    });
    */

    /*
    gridFSBucket.find(eq("metadata.contentType", "image/png")).forEach(
        new Block<GridFSFile>() {
                    
            public void apply(final GridFSFile gridFSFile) {
                System.out.println(gridFSFile.getFilename());
            }
        });
    */

    FileOutputStream streamToDownloadTo = new FileOutputStream("/tmp/test.txt");
    gridFSBucket.downloadToStream(fileId, streamToDownloadTo);
    streamToDownloadTo.close();

    streamToDownloadTo = new FileOutputStream("/tmp/test.txt");
    GridFSDownloadByNameOptions downloadOptions = new GridFSDownloadByNameOptions().revision(0);
    gridFSBucket.downloadToStreamByName("test", streamToDownloadTo, downloadOptions);
    streamToDownloadTo.close();

    GridFSDownloadStream downloadStream = gridFSBucket.openDownloadStream(fileId);
    int fileLength = (int) downloadStream.getGridFSFile().getLength();
    byte[] bytesToWriteTo = new byte[fileLength];
    downloadStream.read(bytesToWriteTo);
    downloadStream.close();

    System.out.println(new String(bytesToWriteTo, StandardCharsets.UTF_8));

    downloadStream = gridFSBucket.openDownloadStreamByName("sample_data");
    fileLength = (int) downloadStream.getGridFSFile().getLength();
    bytesToWriteTo = new byte[fileLength];
    downloadStream.read(bytesToWriteTo);
    downloadStream.close();

    System.out.println(new String(bytesToWriteTo, StandardCharsets.UTF_8));

    gridFSBucket.rename(fileId, "test2");

    gridFSBucket.delete(fileId);
    mongo.close();
}

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From source file:com.imaginea.mongodb.services.impl.GridFSServiceImpl.java

License:Apache License

/**
 * Service implementation for dropping a file from GridFS.
 *
 * @param dbName Name of Database/*from w w  w .j av a 2 s  . c  o m*/
 * @param bucketName Name of GridFS Bucket
 * @param _id Object id of file to be deleted
 * @return Status message.
 */
public String deleteFile(String dbName, String bucketName, String _id)
        throws DatabaseException, DocumentException, CollectionException, ValidationException {
    if (dbName == null) {
        throw new DatabaseException(ErrorCodes.DB_NAME_EMPTY, "Database name is null");

    }
    if (dbName.equals("")) {
        throw new DatabaseException(ErrorCodes.DB_NAME_EMPTY, "Database Name Empty");
    }

    if (bucketName == null) {
        throw new CollectionException(ErrorCodes.COLLECTION_NAME_EMPTY, "Bucket name is null");
    }
    if (bucketName.equals("")) {
        throw new CollectionException(ErrorCodes.COLLECTION_NAME_EMPTY, "Bucket Name Empty");
    }

    String result = null;
    GridFSFile gridFSFile = null;
    try {
        // if (!databaseService.getDbList().contains(dbName)) {
        //   throw new DatabaseException(ErrorCodes.DB_DOES_NOT_EXISTS,
        //       "DB [" + dbName + "] DOES NOT EXIST");
        // }
        if (_id == null) {
            throw new DocumentException(ErrorCodes.DOCUMENT_EMPTY, "File is empty");
        }

        ObjectId objectId = new ObjectId(_id);

        MongoDatabase db = mongoInstance.getDatabase(dbName);

        GridFSBucket gridFS = GridFSBuckets.create(db, bucketName);

        Document id = new Document();

        id.put("_id", objectId);

        gridFSFile = gridFS.find(id).first();
        if (gridFSFile == null) {
            throw new DocumentException(ErrorCodes.DOCUMENT_DOES_NOT_EXIST, "Document does not exist !");
        }

        gridFS.delete(objectId);

    } catch (MongoException e) {
        throw new DocumentException(ErrorCodes.DOCUMENT_DELETION_EXCEPTION, e.getMessage());
    }
    result = "File [" + gridFSFile.getFilename() + "] has been deleted.";
    return result;
}

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From source file:gridfs.GridFSTour.java

License:Apache License

/**
 * Run this main method to see the output of this quick example.
 *
 * @param args takes an optional single argument for the connection string
 * @throws FileNotFoundException if the sample file cannot be found
 * @throws IOException if there was an exception closing an input stream
 *///  w  ww.  j  av a  2 s . c  o m
public static void main(final String[] args) throws FileNotFoundException, IOException {
    MongoClient mongoClient;

    if (args.length == 0) {
        // connect to the local database server
        mongoClient = new MongoClient();
    } else {
        mongoClient = new MongoClient(new MongoClientURI(args[0]));
    }

    // get handle to "mydb" database
    MongoDatabase database = mongoClient.getDatabase("mydb");
    database.drop();

    GridFSBucket gridFSBucket = GridFSBuckets.create(database);

    /*
     * UploadFromStream Example
     */
    // Get the input stream
    InputStream streamToUploadFrom = new ByteArrayInputStream("Hello World".getBytes(StandardCharsets.UTF_8));

    // Create some custom options
    GridFSUploadOptions options = new GridFSUploadOptions().chunkSizeBytes(1024)
            .metadata(new Document("type", "presentation"));

    ObjectId fileId = gridFSBucket.uploadFromStream("mongodb-tutorial", streamToUploadFrom, options);
    streamToUploadFrom.close();
    System.out.println("The fileId of the uploaded file is: " + fileId.toHexString());

    /*
     * OpenUploadStream Example
     */

    // Get some data to write
    byte[] data = "Data to upload into GridFS".getBytes(StandardCharsets.UTF_8);

    GridFSUploadStream uploadStream = gridFSBucket.openUploadStream("sampleData");
    uploadStream.write(data);
    uploadStream.close();
    System.out.println("The fileId of the uploaded file is: " + uploadStream.getFileId().toHexString());

    /*
     * Find documents
     */
    gridFSBucket.find().forEach(new Block<GridFSFile>() {
        @Override
        public void apply(final GridFSFile gridFSFile) {
            System.out.println(gridFSFile.getFilename());
        }
    });

    /*
     * Find documents with a filter
     */
    gridFSBucket.find(eq("metadata.contentType", "image/png")).forEach(new Block<GridFSFile>() {
        @Override
        public void apply(final GridFSFile gridFSFile) {
            System.out.println(gridFSFile.getFilename());
        }
    });

    /*
     * DownloadToStream
     */
    FileOutputStream streamToDownloadTo = new FileOutputStream("/tmp/mongodb-tutorial.txt");
    gridFSBucket.downloadToStream(fileId, streamToDownloadTo);
    streamToDownloadTo.close();

    /*
     * DownloadToStreamByName
     */
    streamToDownloadTo = new FileOutputStream("/tmp/mongodb-tutorial.txt");
    GridFSDownloadByNameOptions downloadOptions = new GridFSDownloadByNameOptions().revision(0);
    gridFSBucket.downloadToStreamByName("mongodb-tutorial", streamToDownloadTo, downloadOptions);
    streamToDownloadTo.close();

    /*
     * OpenDownloadStream
     */
    GridFSDownloadStream downloadStream = gridFSBucket.openDownloadStream(fileId);
    int fileLength = (int) downloadStream.getGridFSFile().getLength();
    byte[] bytesToWriteTo = new byte[fileLength];
    downloadStream.read(bytesToWriteTo);
    downloadStream.close();

    System.out.println(new String(bytesToWriteTo, StandardCharsets.UTF_8));

    /*
     * OpenDownloadStreamByName
     */

    downloadStream = gridFSBucket.openDownloadStreamByName("sampleData");
    fileLength = (int) downloadStream.getGridFSFile().getLength();
    bytesToWriteTo = new byte[fileLength];
    downloadStream.read(bytesToWriteTo);
    downloadStream.close();

    System.out.println(new String(bytesToWriteTo, StandardCharsets.UTF_8));

    /*
     * Rename
     */
    gridFSBucket.rename(fileId, "mongodbTutorial");

    /*
     * Delete
     */
    gridFSBucket.delete(fileId);

    database.drop();
}

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From source file:net.liaocy.ml4j.nlp.word2vec.Train.java

private void saveModel(String modelName, Word2Vec vec) throws IOException {
    MongoDatabase db = Mongo.getDB();// w w  w  .  ja va  2 s . com
    GridFSBucket gridFSBucket = GridFSBuckets.create(db, "word2vecmodels");

    GridFSFile gfsfi = gridFSBucket.find(new Document("filename", modelName)).first();
    if (gfsfi != null) {
        ObjectId id = gfsfi.getObjectId();
        gridFSBucket.delete(id);
    }

    try (GridFSUploadStream uploadStream = gridFSBucket.openUploadStream(modelName)) {
        WordVectorSerializer.writeWord2VecModel(vec, uploadStream);
        System.out.println("Save Model Successed!");
    }
}

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From source file:net.liaocy.ml4j.tfidf.tfidf.java

public void save() throws IOException {
    MongoDatabase db = Mongo.getDB();//from   w w  w.  jav  a 2 s. com
    GridFSBucket gridFSBucket = GridFSBuckets.create(db, "tfidfmodels");

    GridFSFile gfsfi = gridFSBucket.find(new Document("filename", this.modelName)).first();
    if (gfsfi != null) {
        ObjectId id = gfsfi.getObjectId();
        gridFSBucket.delete(id);
    }

    for (Entry<Integer, Integer> word : wordCount.entrySet()) {
        double idf = this.getIdf(word.getValue());
        this.idfMax = Math.max(this.idfMax, idf);
        this.idfMin = Math.min(this.idfMax, idf);
    }

    try (GridFSUploadStream uploadStream = gridFSBucket.openUploadStream(this.modelName)) {
        try (ObjectOutputStream o = new ObjectOutputStream(uploadStream)) {
            o.writeObject(this.wordDocCount);
            o.writeObject(this.docCount);
            o.writeObject(this.wordCount);
            o.writeDouble(this.idfMax.doubleValue());
            o.writeDouble(this.idfMin.doubleValue());
        }
    }

    System.out.println("Save Model Successed!");
}

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From source file:org.apache.nifi.processors.mongodb.gridfs.DeleteGridFS.java

License:Apache License

@Override
public void onTrigger(ProcessContext context, ProcessSession session) throws ProcessException {
    FlowFile input = session.get();/*from  w w w .  j ava 2 s.c om*/
    if (input == null) {
        return;
    }

    final String deleteQuery = getQuery(context, input);
    final String queryAttribute = context.getProperty(QUERY_ATTRIBUTE).isSet()
            ? context.getProperty(QUERY_ATTRIBUTE).evaluateAttributeExpressions(input).getValue()
            : null;
    GridFSBucket bucket = getBucket(input, context);

    try {
        Document query = Document.parse(deleteQuery);
        MongoCursor cursor = bucket.find(query).iterator();
        if (cursor.hasNext()) {
            GridFSFile file = (GridFSFile) cursor.next();
            bucket.delete(file.getObjectId());

            if (!StringUtils.isEmpty(queryAttribute)) {
                input = session.putAttribute(input, queryAttribute, deleteQuery);
            }

            session.transfer(input, REL_SUCCESS);
        } else {
            getLogger().error(String.format("Query %s did not delete anything in %s", deleteQuery,
                    bucket.getBucketName()));
            session.transfer(input, REL_FAILURE);
        }

        cursor.close();
    } catch (Exception ex) {
        getLogger().error(String.format("Error deleting using query: %s", deleteQuery), ex);
        session.transfer(input, REL_FAILURE);
    }
}

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From source file:org.hibernate.ogm.datastore.mongodb.binarystorage.GridFSStorageManager.java

License:LGPL

private void deleteExistingContent(String fieldName, Object documentId, GridFSBucket gridFSFilesBucket) {
    GridFSFindIterable results = gridFSFilesBucket
            .find(Filters.and(Filters.eq("filename", fileName(fieldName, documentId))));
    try (MongoCursor<GridFSFile> iterator = results.iterator()) {
        while (iterator.hasNext()) {
            GridFSFile next = iterator.next();
            gridFSFilesBucket.delete(next.getId());
        }//w ww  . j  a  v  a 2 s  .  c  o m
    }
}

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From source file:org.restheart.db.GridFsDAO.java

License:Open Source License

@Override
public OperationResult deleteFile(final Database db, final String dbName, final String bucketName,
        final BsonObjectId fileId, final String requestEtag, final boolean checkEtag) {
    final String bucket = extractBucketName(bucketName);

    GridFSBucket gridFSBucket = GridFSBuckets.create(db.getDatabase(dbName), bucket);

    GridFSFile file = gridFSBucket.find(eq("_id", fileId)).limit(1).iterator().tryNext();

    if (file == null) {
        return new OperationResult(HttpStatus.SC_NOT_FOUND);
    } else if (checkEtag) {
        Object oldEtag = file.getMetadata().get("_etag");

        if (oldEtag != null) {
            if (requestEtag == null) {
                return new OperationResult(HttpStatus.SC_CONFLICT, oldEtag);
            } else if (!Objects.equals(oldEtag.toString(), requestEtag)) {
                return new OperationResult(HttpStatus.SC_PRECONDITION_FAILED, oldEtag);
            }//from   w ww.  ja va  2 s  . c  om
        }
    }

    gridFSBucket.delete(fileId.asObjectId().getValue());

    return new OperationResult(HttpStatus.SC_NO_CONTENT);
}

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