Initialize a SourceOptions object from a json dictionary.

def _from_dict(cls, _dict):
        """Initialize a SourceOptions object from a json dictionary."""
        args = {}
        if 'folders' in _dict:
            args['folders'] = [
                SourceOptionsFolder._from_dict(x)
                for x in (_dict.get('folders'))
            ]
        if 'objects' in _dict:
            args['objects'] = [
                SourceOptionsObject._from_dict(x)
                for x in (_dict.get('objects'))
            ]
        if 'site_collections' in _dict:
            args['site_collections'] = [
                SourceOptionsSiteColl._from_dict(x)
                for x in (_dict.get('site_collections'))
            ]
        if 'urls' in _dict:
            args['urls'] = [
                SourceOptionsWebCrawl._from_dict(x) for x in (_dict.get('urls'))
            ]
        if 'buckets' in _dict:
            args['buckets'] = [
                SourceOptionsBuckets._from_dict(x)
                for x in (_dict.get('buckets'))
            ]
        if 'crawl_all_buckets' in _dict:
            args['crawl_all_buckets'] = _dict.get('crawl_all_buckets')
        return cls(**args)