Examples of org.bson.types.ObjectId

org.bson.types.ObjectId
A globally unique identifier for objects.
Consists of 12 bytes, divided as follows:
```
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 time machine  pid inc
 
 
```
@dochub objectids

    }


    public int readBlob(String blobId, long pos, byte[] buff, int off,
            int length) throws Exception {


        GridFSDBFile f = fs.findOne(new ObjectId(blobId));
        if (f == null) {
            throw new NotFoundException(blobId);
        }
        // todo provide a more efficient implementation (gridfs stores the data in chunks)
        //long nChunk = pos / f.getChunkSize();

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            IOUtils.closeQuietly(in);
        }
    }


    public long getBlobLength(String blobId) throws Exception {
        GridFSDBFile f = fs.findOne(new ObjectId(blobId));
        if (f == null) {
            throw new NotFoundException(blobId);
        }


        return f.getLength();

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    String userId = fromLongToId(Long.parseLong(userID));
    String itemId = fromLongToId(Long.parseLong(itemID));
    if (isUserItemInDB(userId, itemId)) {
      mongoTimestamp = new Date();
      BasicDBObject query = new BasicDBObject();
      query.put(mongoUserID, userIsObject ? new ObjectId(userId) : userId);
      query.put(mongoItemID, itemIsObject ? new ObjectId(itemId) : itemId);
      if (mongoFinalRemove) {
        log.info(collection.remove(query).toString());
      } else {
        BasicDBObject update = new BasicDBObject();
        update.put("$set", new BasicDBObject("deleted_at", mongoTimestamp));

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    String userId = fromLongToId(Long.parseLong(userID));
    String itemId = fromLongToId(Long.parseLong(itemID));
    if (!isUserItemInDB(userId, itemId)) {
      mongoTimestamp = new Date();
      BasicDBObject user = new BasicDBObject();
      Object userIdObject = userIsObject ? new ObjectId(userId) : userId;
      Object itemIdObject = itemIsObject ? new ObjectId(itemId) : itemId;
      user.put(mongoUserID, userIdObject);
      user.put(mongoItemID, itemIdObject);
      user.put(mongoPreference, preferenceIsString ? preferenceValue : Double.parseDouble(preferenceValue));
      user.put("created_at", mongoTimestamp);
      collection.insert(user);

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    }
  }


  private boolean isUserItemInDB(String userID, String itemID) {
    BasicDBObject query = new BasicDBObject();
    Object userId = userIsObject ? new ObjectId(userID) : userID;
    Object itemId = itemIsObject ? new ObjectId(itemID) : itemID;
    query.put(mongoUserID, userId);
    query.put(mongoItemID, itemId);
    return collection.findOne(query) != null;
  }

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    Object result;
    if (storeType == DocumentFieldType.OBJECTID) {
      // Try auto-conversion of BSON data to ObjectId
      // It will work if data is stored as String or as ObjectId
      Object bin = easybson.get(docf);
      ObjectId id = ObjectId.massageToObjectId(bin);
      result = new Utf8(id.toString());
    } else if (storeType == DocumentFieldType.DATE) {
      Object bin = easybson.get(docf);
      if (bin instanceof Date) {
        Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
        calendar.setTime((Date) bin);

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  private Object stringToMongo(final Schema fieldSchema,
      final DocumentFieldType storeType, final Object value) {
    Object result = null;
    if (storeType == DocumentFieldType.OBJECTID) {
      if (value != null) {
        ObjectId id;
        try {
          id = new ObjectId(value.toString());
        } catch (IllegalArgumentException e1) {
          // Unable to parse anything from Utf8 value, throw error
          throw new IllegalStateException("Field " + fieldSchema.getType()
              + ": Invalid string: unable to convert to ObjectId");
        }

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        }
    }


    public void saveFile(Message<JsonObject> message, JsonObject jsonObject) {


        ObjectId id = getObjectId(message, jsonObject, "id");
        if (id == null) {
            return;
        }


        Integer length = getRequiredInt("length", message, jsonObject, 1);

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        if (data == null || data.length == 0) {
            sendError(message, "chunk data is missing");
            return;
        }


        ObjectId id = getObjectId(message, jsonObject, "files_id");
        if (id == null) {
            return;
        }


        Integer n = getRequiredInt("n", message, jsonObject, 0);

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    }


    public void getFile(Message<JsonObject> message, JsonObject jsonObject) {


        ObjectId objectId = getObjectId(message, jsonObject, "id");
        if (objectId == null) {
            return;
        }


        // Optional bucket, default is "fs"
        String bucket = jsonObject.getString("bucket", GridFS.DEFAULT_BUCKET);
        GridFS files = new GridFS(db, bucket);


        GridFSDBFile file = files.findOne(objectId);
        if (file == null) {
            sendError(message, "File does not exist: " + objectId.toString());
            return;
        }


        JsonObject fileInfo = new JsonObject()
                .putString("filename", file.getFilename())

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