Examples of org.bson.BSONObject.keySet()

org.bson.BSONObject.keySet()
Returns this object's fields' names @return The names of the fields in this object

            if (Utils.containsQueryExpression(keyObj)) {
                if (keyObj.keySet().size() != 1) {
                    throw new UnsupportedOperationException("illegal query key: " + keyValue);
                }


                String expression = keyObj.keySet().iterator().next();
                if (expression.startsWith("$")) {
                    return getPositionsForExpression(keyObj, expression);
                }
            }
        } else if (keyValue instanceof Pattern) {

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            BSONObject stats = collection.getStats();
            objects += ((Number) stats.get("count")).longValue();
            dataSize += ((Number) stats.get("size")).longValue();


            BSONObject indexSizes = (BSONObject) stats.get("indexSize");
            for (String indexName : indexSizes.keySet()) {
                indexSize += ((Number) indexSizes.get(indexName)).longValue();
            }


        }
        if (objects > 0) {

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        return new ObjectId();
    }


    private Object deriveIdFromExpression(Object value) {
        BSONObject expression = (BSONObject) value;
        for (String key : expression.keySet()) {
            Object expressionValue = expression.get(key);
            if (key.equals("$in")) {
                Collection<?> list = (Collection<?>) expressionValue;
                if (!list.isEmpty()) {
                    return list.iterator().next();

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                continue;
            }
            objs.add(documents.get(pos.intValue()));
        }


        if (orderBy != null && !orderBy.keySet().isEmpty()) {
            if (orderBy.keySet().iterator().next().equals("$natural")) {
                if (orderBy.get("$natural").equals(Integer.valueOf(1))) {
                    // keep it as is
                } else if (orderBy.get("$natural").equals(Integer.valueOf(-1))) {
                    Collections.reverse(objs);

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            }
            objs.add(documents.get(pos.intValue()));
        }


        if (orderBy != null && !orderBy.keySet().isEmpty()) {
            if (orderBy.keySet().iterator().next().equals("$natural")) {
                if (orderBy.get("$natural").equals(Integer.valueOf(1))) {
                    // keep it as is
                } else if (orderBy.get("$natural").equals(Integer.valueOf(-1))) {
                    Collections.reverse(objs);
                }

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                long newSize = Utils.calculateSize(newDocument);
                dataSize.addAndGet(newSize - oldSize);


                // only keep fields that are also in the updated document
                Set<String> fields = new HashSet<String>(document.keySet());
                fields.removeAll(newDocument.keySet());
                for (String key : fields) {
                    document.removeField(key);
                }


                // update the fields

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                for (String key : fields) {
                    document.removeField(key);
                }


                // update the fields
                for (String key : newDocument.keySet()) {
                    if (key.contains(".")) {
                        throw new MongoServerException(
                                "illegal field name. must not happen as it must be catched by the driver");
                    }
                    document.put(key, newDocument.get(key));

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    }


    private List<Object> decodeArray(ByteBuf buffer) throws IOException {
        List<Object> array = new ArrayList<Object>();
        BSONObject arrayObject = decodeBson(buffer);
        for (String key : arrayObject.keySet()) {
            array.add(arrayObject.get(key));
        }
        return array;
    }

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        if (!(value instanceof BSONObject)) {
            return false;
        }


        BSONObject doc = (BSONObject) value;
        for (String key : doc.keySet()) {
            if (key.startsWith("$")) {
                return true;
            }
            if (containsQueryExpression(doc.get(key))) {
                return true;

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                iter.eval((T) k, (V) m.get(k));
            return;
        }
        if (x instanceof BSONObject) {
            BSONObject m = (BSONObject) x;
            for (String k : m.keySet())
                iter.eval((T) k, (V) m.get(k));
            return;
        }


    }

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