Java GridFSFile类代码示例

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
protected void validateAfterStoreAdd(TestContext context, Vertx vertx,
    String path, Handler<AsyncResult<Void>> handler) {
  vertx.executeBlocking(f -> {
    try (MongoClient client = new MongoClient(mongoConnector.serverAddress)) {
      MongoDatabase db = client.getDatabase(MongoDBTestConnector.MONGODB_DBNAME);
      GridFSBucket gridFS = GridFSBuckets.create(db);

      GridFSFindIterable files = gridFS.find();

      GridFSFile file = files.first();
      ByteArrayOutputStream baos = new ByteArrayOutputStream();
      gridFS.downloadToStream(file.getFilename(), baos);
      String contents = new String(baos.toByteArray(), StandardCharsets.UTF_8);
      context.assertEquals(CHUNK_CONTENT, contents);
    }
    f.complete();
  }, handler);
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
public boolean checkAndCleanup(String userId, String fileName) {
    List<Document> l = query(new Query().equals(USERID, userId).addSortCriteria(CREATION_TIME, false));
    if (l.size() >= maxPersistedPagesPerUser) {
        Document oldest = l.iterator().next();
        if ((System.currentTimeMillis() - oldest.get(CREATION_TIME).getTime()) < minimumDelay) {
            //there have been to many page persistences for this user in a short time, so don't persist
            return false;
        } else {
            //clean up oldest to free space for new persisted page
            gridFS.find(Filters.eq("filename", oldest.get(FILENAME))).forEach(new Block<GridFSFile>() {
                @Override
                public void apply(GridFSFile file) {
                    gridFS.delete(file.getObjectId());
                }
            });
            oldest.delete();
        }
    }
    //create new entry
    Document newOne = createNew();
    newOne.set(USERID, userId);
    newOne.set(FILENAME, fileName);
    newOne.set(CREATION_TIME, new Date());
    newOne.writeToDatabase(false);
    return true;
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public void byPages(int pageSize, Callback callback) {
	MongoCursor<GridFSFile> cursor = bucket.find().iterator();
	boolean loop = true;
	try {
		while (loop) {
			List<GridFSFile> files = new ArrayList<>(batchSize);
			int i = 0;
			while (cursor.hasNext() && i < batchSize) {
				files.add(cursor.next());
				i++;
			}
			loop = callback.on(files.stream().map(file -> bucket.openDownloadStream(file.getObjectId())).map(fromFile).collect(Collectors.toList()));
		}
	} finally {
		cursor.close();
	}
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public InputStream getAssociatedDocumentStream(String uniqueId, String fileName) {
	GridFSBucket gridFS = createGridFSConnection();
	GridFSFile file = gridFS.find(new Document(ASSOCIATED_METADATA + "." + FILE_UNIQUE_ID_KEY, getGridFsId(uniqueId, fileName))).first();

	if (file == null) {
		return null;
	}

	InputStream is = gridFS.openDownloadStream(file.getObjectId());
	;

	Document metadata = file.getMetadata();
	if (metadata.containsKey(COMPRESSED_FLAG)) {
		boolean compressed = (boolean) metadata.remove(COMPRESSED_FLAG);
		if (compressed) {
			is = new InflaterInputStream(is);
		}
	}

	return is;
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
public Document findMetadata(String oid) {
	GridFSFile first = fileStore.find(eq("_id", new ObjectId(oid))).first();
	if(first == null) {
		return null;
	} else {
		return first.getMetadata();
	}
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
private SmofGridRef toSmofGridRef(BsonDocument refBson) {
	final String bucketName = refBson.getString("bucket").getValue();
	final ObjectId id = refBson.getObjectId("id").getValue();
	final SmofGridRef ref = SmofGridRefFactory.newFromDB(id, bucketName);
	final GridFSFile file = dispatcher.loadMetadata(ref);
	ref.putMetadata(file.getMetadata());
	return ref;
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Test
public final void testMetadata() throws IOException {
	final Document metadata = new Document("randomkey", 45);
	ref.putMetadata(metadata);
	streamManager.uploadFile(ref);
	ref.putMetadata(new Document());
	final GridFSFile file = streamManager.loadFileMetadata(ref);
	assertEquals(metadata, file.getMetadata());
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
public void deleteFile(Document mo) {
        String filename = mo.get(this);
        if (filename != null) {
            fileSystemProvider.getFileSystem().find(Filters.eq("filename", filename)).forEach(new Block<GridFSFile>() {
                @Override
                public void apply(GridFSFile file) {
                    fileSystemProvider.getFileSystem().delete(file.getObjectId());
                }
            });
            mo.getDataObject().remove(this.getName());
//            mo.writeToDatabase(false);
        }
    }
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public Observable<GridFSFile> first() {
    return RxObservables.create(Observables.observe(new Block<SingleResultCallback<GridFSFile>>(){
        @Override
        public void apply(final SingleResultCallback<GridFSFile> callback) {
            wrapped.first(callback);
        }
    }), observableAdapter);
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public Observable<GridFSFile> getGridFSFile() {
    return RxObservables.create(Observables.observe(new Block<SingleResultCallback<GridFSFile>>() {
        @Override
        public void apply(final SingleResultCallback<GridFSFile> callback) {
            wrapped.getGridFSFile(callback);
        }
    }), observableAdapter);
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public Publisher<GridFSFile> getGridFSFile() {
    return new ObservableToPublisher<GridFSFile>(observe(new Block<SingleResultCallback<GridFSFile>>() {
        @Override
        public void apply(final SingleResultCallback<GridFSFile> callback) {
            wrapped.getGridFSFile(callback);
        }
    }));
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public Publisher<GridFSFile> first() {
    return new ObservableToPublisher<GridFSFile>(observe(new Block<SingleResultCallback<GridFSFile>>(){
        @Override
        public void apply(final SingleResultCallback<GridFSFile> callback) {
            wrapped.first(callback);
        }
    }));
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public OperationResult deleteFile(
        final Database db,
        final String dbName,
        final String bucketName,
        final BsonValue 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);
            }
        }
    }

    gridFSBucket.delete(fileId);

    return new OperationResult(HttpStatus.SC_NO_CONTENT);
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
@Override
public void handleRequest(
        HttpServerExchange exchange,
        RequestContext context)
        throws Exception {
    if (context.isInError()) {
        next(exchange, context);
        return;
    }

    LOGGER.trace("GET " + exchange.getRequestURL());
    final String bucket = extractBucketName(context.getCollectionName());

    GridFSBucket gridFSBucket = GridFSBuckets.create(
            MongoDBClientSingleton.getInstance().getClient()
                    .getDatabase(context.getDBName()),
            bucket);

    GridFSFile dbsfile = gridFSBucket
            .find(eq("_id", context.getDocumentId()))
            .limit(1).iterator().tryNext();

    if (dbsfile == null) {
        fileNotFound(context, exchange);
    } else if (!checkEtag(exchange, dbsfile)) {
        sendBinaryContent(context, gridFSBucket, dbsfile, exchange);
    }

    next(exchange, context);
}
 

import com.mongodb.client.gridfs.model.GridFSFile; //导入依赖的package包/类
private boolean checkEtag(HttpServerExchange exchange, GridFSFile dbsfile) {
    if (dbsfile != null) {
        Object etag;

        if (dbsfile.getMetadata() != null
                && dbsfile.getMetadata().containsKey("_etag")) {
            etag = dbsfile.getMetadata().get("_etag");
        } else {
            etag = null;
        }

        if (etag != null && etag instanceof ObjectId) {
            ObjectId _etag = (ObjectId) etag;

            BsonObjectId __etag = new BsonObjectId(_etag);

            // in case the request contains the IF_NONE_MATCH header with the current etag value,
            // just return 304 NOT_MODIFIED code
            if (RequestHelper.checkReadEtag(exchange, __etag)) {
                exchange.setStatusCode(HttpStatus.SC_NOT_MODIFIED);
                exchange.endExchange();
                return true;
            }
        }
    }

    return false;
}