How to use the stix2.datastore.filters.FilterSet function in stix2

Args:
            stix_id (str): id of the STIX objects to retrieve.
            _composite_filters (FilterSet): a collection of filters passed from a
                CompositeDataSource (i.e. if this CompositeDataSource is
                attached to a parent CompositeDataSource), not user supplied.

        Returns:
            list: The STIX objects that have the specified id.

        """
        if not self.has_data_sources():
            raise AttributeError("CompositeDataSource has no data sources")

        all_data = []
        all_filters = FilterSet()

        all_filters.add(self.filters)

        if _composite_filters:
            all_filters.add(_composite_filters)

        # retrieve STIX objects from all configured data sources
        for ds in self.data_sources:
            data = ds.all_versions(stix_id=stix_id, _composite_filters=all_filters)
            all_data.extend(data)

        # remove exact duplicates (where duplicates are STIX 2.0 objects
        # with the same 'id' and 'modified' values)
        if len(all_data) > 0:
            all_data = deduplicate(all_data)

A "complete query" includes the filters from the query, the filters
        attached to MemorySource, and any filters passed from a
        CompositeDataSource (i.e. _composite_filters)

        Args:
            query (list): list of filters to search on
            _composite_filters (FilterSet): collection of filters passed from
                the CompositeDataSource, not user supplied

        Returns:
            (list): list of STIX objects that matches the supplied
                query. The STIX objects are received from TAXII as dicts,
                parsed into python STIX objects and then returned.

        """
        query = FilterSet(query)

        # combine all query filters
        if self.filters:
            query.add(self.filters)
        if _composite_filters:
            query.add(_composite_filters)

        # parse taxii query params (that can be applied remotely)
        taxii_filters = self._parse_taxii_filters(query)

        # taxii2client requires query params as keywords
        taxii_filters_dict = dict((f.property, f.value) for f in taxii_filters)

        # query TAXII collection
        try:
            all_data = self.collection.get_objects(**taxii_filters_dict)['objects']

def vulnerabilities(filters=None):
    """Retrieve all Vulnerability objects.

    Args:
        filters (list, optional): A list of additional filters to apply to
            the query.

    """
    filter_list = FilterSet(filters)
    filter_list.add(Filter('type', '=', 'vulnerability'))
    return query(filter_list)

Args:
            query (list): list of filters to search on
            _composite_filters (FilterSet): collection of filters passed from
                the CompositeDataSource, not user supplied
            version (str): If present, it forces the parser to use the version
                provided. Otherwise, the library will make the best effort based
                on checking the "spec_version" property.

        Returns:
            (list): list of STIX objects that matches the supplied
                query. The STIX objects are loaded from their json files,
                parsed into a python STIX objects and then returned.

        """
        all_data = []
        query = FilterSet(query)

        # combine all query filters
        if self.filters:
            query.add(self.filters)
        if _composite_filters:
            query.add(_composite_filters)

        auth_types, auth_ids = _find_search_optimizations(query)
        type_dirs = _get_matching_dir_entries(
            self._stix_dir, auth_types,
            stat.S_ISDIR,
        )
        for type_dir in type_dirs:
            type_path = os.path.join(self._stix_dir, type_dir)
            if type_dir == "marking-definition":
                type_results = _search_markings(

def __init__(self):
        super(DataSource, self).__init__()
        self.id = make_id()
        self.filters = FilterSet()

CompositeDataSource (i.e. _composite_filters).

        Args:
            query (list): list of filters to search on
            _composite_filters (FilterSet): collection of filters passed from
                the CompositeDataSource, not user supplied

        Returns:
            stix_objs (list): list of STIX objects that matches the supplied
                query. The STIX objects are loaded from their json files,
                parsed into a python STIX objects and then returned.

        """
        all_data = []

        query = FilterSet(query)

        # combine all query filters
        if self.filters:
            query.add(self.filters)
        if _composite_filters:
            query.add(_composite_filters)

        # extract any filters that are for "type" or "id" , as we can then do
        # filtering before reading in the STIX objects. A STIX 'type' filter
        # can reduce the query to a single sub-directory. A STIX 'id' filter
        # allows for the fast checking of the file names versus loading it.
        file_filters = self._parse_file_filters(query)

        # establish which subdirectories can be avoided in query
        # by decluding as many as possible. A filter with "type" as the property
        # means that certain STIX object types can be ruled out, and thus

def threat_actors(filters=None):
    """Retrieve all Threat Actor objects.

    Args:
        filters (list, optional): A list of additional filters to apply to
            the query.

    """
    filter_list = FilterSet(filters)
    filter_list.add(Filter('type', '=', 'threat-actor'))
    return query(filter_list)

"""Search and retrieve STIX objects based on the complete query.

        A "complete query" includes the filters from the query, the filters
        attached to this MemorySource, and any filters passed from a
        CompositeDataSource (i.e. _composite_filters).

        Args:
            query (list): list of filters to search on
            _composite_filters (FilterSet): collection of filters passed from the
                CompositeDataSource, not user supplied

        Returns:
            (list): list of STIX objects that match the supplied query.

        """
        query = FilterSet(query)

        # combine all query filters
        if self.filters:
            query.add(self.filters)
        if _composite_filters:
            query.add(_composite_filters)

        all_objs = itertools.chain.from_iterable(
            value.all_versions.values() if isinstance(value, _ObjectFamily)
            else [value]
            for value in self._data.values()
        )

        # Apply STIX common property filters.
        all_data = list(apply_common_filters(all_objs, query))

"""Search and retrieve STIX objects based on the complete query.

        A "complete query" includes the filters from the query, the filters
        attached to this MemorySource, and any filters passed from a
        CompositeDataSource (i.e. _composite_filters).

        Args:
            query (list): list of filters to search on
            _composite_filters (FilterSet): collection of filters passed from
                the CompositeDataSource, not user supplied

        Returns:
            (list): list of STIX objects that match the supplied query.

        """
        query = FilterSet(query)

        # combine all query filters
        if self.filters:
            query.add(self.filters)
        if _composite_filters:
            query.add(_composite_filters)

        all_objs = itertools.chain.from_iterable(
            value.all_versions.values() if isinstance(value, _ObjectFamily)
            else [value]
            for value in self._data.values()
        )

        # Apply STIX common property filters.
        all_data = list(apply_common_filters(all_objs, query))