.cc

const std::string kVertexPrefix = "V:";
const std::string kEdgePrefix = "E:";
const std::string kIndexVertexPrefix = "IV:";
const std::string kIndexEdgePrefix = "IE:";
const std::string kPropGlue = "$";
const std::string kInGlue = "IN:";
const std::string kOutGlue = "OUT:";

const std::string kPropVertexPrefix = kPropGlue + kVertexPrefix;
const std::string kPropEdgePrefix = kPropGlue + kEdgePrefix;

const std::string kIndexVertexInPrefix = kInGlue + kIndexVertexPrefix; // from to ...
const std::string kIndexVertexOutPrefix = kOutGlue + kIndexVertexPrefix;

std::set<string> Edge::drop_set() {
    std::set<std::string> rm_keys;
    rm_keys.insert(kEdgePrefix + ft_id);
    rm_keys.insert(kIndexVertexOutPrefix + from_id ); // source out
    rm_keys.insert(kIndexVertexInPrefix + to_id ); // dest in
    std::map<std::string,std::string> pro_map;
    ldb_map_scan(db, kPropEdgePrefix + ft_id , & pro_map);
    for(std::map<std::string,std::string>::const_iterator it= pro_map.begin();
            it!=pro_map.end();
            it++ ) {
        rm_keys.insert(kPropEdgePrefix + ft_id + it->first);
        rm_keys.insert( kIndexEdgePrefix + it->second + kPropGlue + ft_id );
    }
    for(std::set<std::string>::const_iterator it = rm_keys.begin();
            it != rm_keys.end();
            it++ ) {
        printf("Edge::drop_set %s\n",it->c_str());
    }
    return rm_keys;
}