Examples of com.mongodb.gridfs.GridFSDBFile$MyInputStream

com.mongodb.gridfs.GridFSDBFile
This class enables to retrieve a GridFS file metadata and content. Operations include: - writing data to a file on disk or an OutputStream - getting each chunk as a byte array - getting an InputStream to stream the data into @author antoine

        User u = new User();
        u.name = "alex";
        u.photo = blob;
        u.save();


        GridFSDBFile file = Blob.findFile(u.getBlobFileName("photo"));
        
        assertThatPhotoBlobIsValid(file);
        u.delete();


        file = Blob.findFile(u.getBlobFileName("photo"));

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        b.name = "bob";
        b.tag = "testing";
        b.photo = newBlob();
        b.save();
        
        GridFSDBFile file = Blob.findFile(a.getBlobFileName("photo"));
        assertThatPhotoBlobIsValid(file);


        file = Blob.findFile(b.getBlobFileName("photo"));
        assertThatPhotoBlobIsValid(file);

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    return oid;
  }


  @Override
  public Object convert(long oid) throws IOException {
    GridFSDBFile file = _gridFS.findOne(new BasicDBObject(MongoDBVLargeCollection.OID, oid));
    if (file == null) {
      return null;
    }
    int type = (Integer)file.get(BINARY_TYPE);
    Object r;
    if (type == BYTEARRAY) {
      r = toByteArray(file);
    } else if (type == INPUTSTREAM) {
      r = file.getInputStream();
    } else if (type == BYTEBUFFER) {
      r = ByteBuffer.wrap(toByteArray(file));
    } else if (type == FLOATARRAY) {
      r = toFloatArray(file);
    } else if (type == FLOATBUFFER) {
      r = FloatBuffer.wrap(toFloatArray(file));
    } else {
      //no information. simply forward the input stream
      r = file.getInputStream();
    }
    return r;
  }

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        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();
    }

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    public Integer execute() throws Exception {
        return fetchBlobFromMongo();
    }


    private int fetchBlobFromMongo() throws Exception {
        GridFSDBFile gridFile = gridFS.findOne(new BasicDBObject("md5", blobId));
        long fileLength = gridFile.getLength();
        long start = blobOffset;
        long end = blobOffset + length;
        if (end > fileLength) {
            end = fileLength;
        }
        length = (int)(end - start);


        if (start < end) {
            InputStream is = gridFile.getInputStream();
            if (blobOffset > 0) {
                IOUtils.skipFully(is, blobOffset);
            }
            IOUtils.readFully(is, buffer, bufferOffset, length);
            is.close();

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    }


    private String saveBlob() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(is);
        String md5 = calculateMd5(bis);
        GridFSDBFile gridFile = gridFS.findOne(new BasicDBObject("md5", md5));
        if (gridFile != null) {
            is.close();
            return md5;
        }

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            in.validate();


            String id = in.getId().toString();
            logger.debug("GridFS in: {}", in);
            logger.debug("Document created with id: {}", id);
            GridFSDBFile out = gridFS.findOne(in.getFilename());
            logger.debug("GridFS from findOne: {}", out);
            out = gridFS.findOne(new ObjectId(id));
            logger.debug("GridFS from findOne: {}", out);
            Assert.assertEquals(out.getId(), in.getId());
            ids.add(id);
        }


        CountResponse countResponse;

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                && (operation == Operation.INSERT || operation == Operation.UPDATE)) {
            if (objectId == null) {
                throw new NullPointerException(MongoDBRiver.MONGODB_ID_FIELD);
            }
            GridFS grid = new GridFS(mongoShardClient.getDB(definition.getMongoDb()), collection);
            GridFSDBFile file = grid.findOne(new ObjectId(objectId));
            if (file != null) {
                logger.trace("Caught file: {} - {}", file.getId(), file.getFilename());
                object = file;
            } else {
                logger.error("Cannot find file from id: {}", objectId);
            }
        }

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                    cursor = grid.getFileList();
                    while (cursor.hasNext()) {
                        DBObject object = cursor.next();
                        if (object instanceof GridFSDBFile) {
                            GridFSDBFile file = grid.findOne(new ObjectId(object.get(MongoDBRiver.MONGODB_ID_FIELD).toString()));
                            if (cursor.hasNext()) {
                              lastId = addInsertToStream(null, file);
                            } else {
                              logger.debug("Last entry for initial import of {} - add timestamp: {}", collection.getFullName(), timestamp);
                              lastId = addInsertToStream(timestamp, file);

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            String id = in.getId().toString();
            logger.debug("GridFS in: {}", in);
            logger.debug("Document created with id: {}", id);


            GridFSDBFile out = gridFS.findOne(in.getFilename());
            logger.debug("GridFS from findOne: {}", out);
            out = gridFS.findOne(new ObjectId(id));
            logger.debug("GridFS from findOne: {}", out);
            Assert.assertEquals(out.getId(), in.getId());


            createRiver();
            Thread.sleep(wait);
            refreshIndex();


            CountResponse countResponse = getNode().client().count(countRequest(getIndex())).actionGet();
            logger.debug("Index total count: {}", countResponse.getCount());
            assertThat(countResponse.getCount(), equalTo(1l));


            GetResponse getResponse = getNode().client().get(getRequest(getIndex()).id(id)).get();
            logger.debug("Get request for id {}: {}", id, getResponse.isExists());
            assertThat(getResponse.isExists(), equalTo(true));


            SearchResponse response = getNode().client().prepareSearch(getIndex()).setQuery(QueryBuilders.queryString("Aliquam")).execute()
                    .actionGet();
            logger.debug("SearchResponse {}", response.toString());
            long totalHits = response.getHits().getTotalHits();
            logger.debug("TotalHits: {}", totalHits);
            assertThat(totalHits, equalTo(1l));


            in = gridFS.createFile(content);
            in.setFilename("test-attachment-2.html");
            in.setContentType("text/html");
            in.save();
            in.validate();


            id = in.getId().toString();


            out = gridFS.findOne(in.getFilename());
            logger.debug("GridFS from findOne: {}", out);
            out = gridFS.findOne(new ObjectId(id));
            logger.debug("GridFS from findOne: {}", out);
            Assert.assertEquals(out.getId(), in.getId());


            Thread.sleep(wait);
            refreshIndex();


            countResponse = getNode().client().count(countRequest(getIndex())).actionGet();

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