cleanup.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "cleanup.hpp"

namespace nfd {

void
cleanupOnFaceRemoval(NameTree& nt, Fib& fib, Pit& pit, const Face& face)
{
  std::multimap<size_t, const name_tree::Entry*> maybeEmptyNtes;

  // visit FIB and PIT entries in one pass of NameTree enumeration
  for (const name_tree::Entry& nte : nt) {
    fib::Entry* fibEntry = nte.getFibEntry();
    if (fibEntry != nullptr) {
      fib.removeNextHop(*fibEntry, face);
    }

    for (const auto& pitEntry : nte.getPitEntries()) {
      pit.deleteInOutRecords(pitEntry.get(), face);
    }

    if (!nte.hasTableEntries()) {
      maybeEmptyNtes.emplace(nte.getName().size(), &nte);
    }
  }

  // try to erase longer names first, so that children are erased before parent is checked
  for (auto i = maybeEmptyNtes.rbegin(); i != maybeEmptyNtes.rend(); ++i) {
    nt.eraseIfEmpty(const_cast<name_tree::Entry*>(i->second), false);
  }

  BOOST_ASSERT(nt.size() == 0 ||
               std::none_of(nt.begin(), nt.end(),
                            [] (const name_tree::Entry& nte) { return nte.isEmpty(); }));
}

} // namespace nfd