mongo数据集合属性中存在点号(.)

//插入时转换
public void put(MongoPersistentProperty prop,   value) {
    Assert.notNull(prop, "MongoPersistentProperty must not be null!");
    String fieldName = prop.getFieldName();
    if (!fieldName.contains(".")) {
        db .put(fieldName, value);
        return;
    }
    Iterator<String> parts = Arrays.asList(fieldName.split("\\.")).iterator();
    DB  db  = this.db ;
    while (parts.hasNext()) {
        String part = parts.next();
        if (parts.hasNext()) {
            db  = getOrCreateNestedDb (part, db );
        } else {
            db .put(part, value);
        }
    }
}

//查询时转换
public   get(MongoPersistentProperty property) {
    String fieldName = property.getFieldName();
    if (!fieldName.contains(".")) {
        return this.db .get(fieldName);
    }
    Iterator<String> parts = Arrays.asList(fieldName.split("\\.")).iterator();
    Map<String,  > source = this.db ;
      result = null;
    while (source != null && parts.hasNext()) {
        result = source.get(parts.next());
        if (parts.hasNext()) {
            source = getAsMap(result);
        }
    }
    return result;
}

//判断值是否为空
public boolean hasValue(MongoPersistentProperty property) {
    Assert.notNull(property, "Property must not be null!");
    String fieldName = property.getFieldName();
    if (!fieldName.contains(".")) {
        return this.db .containsField(fieldName);
    }
    String[] parts = fieldName.split("\\.");
    Map<String,  > source = this.db ;
      result = null;
    for (int i = 1; i < parts.length; i++) {
        result = source.get(parts[i - 1]);
        source = getAsMap(result);
        if (source == null) {
            return false;
        }
    }
    return source.containsKey(parts[parts.length - 1]);
}