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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (c) 2013-2014, Regents of the University of California.
* All rights reserved.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*
* This file licensed under New BSD License. See COPYING for detailed information about
* ndn-cxx library copyright, permissions, and redistribution restrictions.
*
* @author Alexander Afanasyev <http://lasr.cs.ucla.edu/afanasyev/index.html>
*/
#include "common.hpp"
#include "exclude.hpp"
namespace ndn {
Exclude::Exclude()
{
}
// example: ANY /b /d ANY /f
//
// ordered in map as:
//
// /f (false); /d (true); /b (false); / (true)
//
// lower_bound(/) -> / (true) <-- excluded (equal)
// lower_bound(/a) -> / (true) <-- excluded (any)
// lower_bound(/b) -> /b (false) <--- excluded (equal)
// lower_bound(/c) -> /b (false) <--- not excluded (not equal and no ANY)
// lower_bound(/d) -> /d (true) <- excluded
// lower_bound(/e) -> /d (true) <- excluded
bool
Exclude::isExcluded(const name::Component& comp) const
{
const_iterator lowerBound = m_exclude.lower_bound(comp);
if (lowerBound == end())
return false;
if (lowerBound->second)
return true;
else
return lowerBound->first == comp;
return false;
}
Exclude&
Exclude::excludeOne(const name::Component& comp)
{
if (!isExcluded(comp))
{
m_exclude.insert(std::make_pair(comp, false));
}
return *this;
}
// example: ANY /b0 /d0 ANY /f0
//
// ordered in map as:
//
// /f0 (false); /d0 (true); /b0 (false); / (true)
//
// lower_bound(/) -> / (true) <-- excluded (equal)
// lower_bound(/a0) -> / (true) <-- excluded (any)
// lower_bound(/b0) -> /b0 (false) <--- excluded (equal)
// lower_bound(/c0) -> /b0 (false) <--- not excluded (not equal and no ANY)
// lower_bound(/d0) -> /d0 (true) <- excluded
// lower_bound(/e0) -> /d0 (true) <- excluded
// examples with desired outcomes
// excludeRange(/, /f0) -> ANY /f0
// /f0 (false); / (true)
// excludeRange(/, /f1) -> ANY /f1
// /f1 (false); / (true)
// excludeRange(/a0, /e0) -> ANY /f0
// /f0 (false); / (true)
// excludeRange(/a0, /e0) -> ANY /f0
// /f0 (false); / (true)
// excludeRange(/b1, /c0) -> ANY /b0 /b1 ANY /c0 /d0 ANY /f0
// /f0 (false); /d0 (true); /c0 (false); /b1 (true); /b0 (false); / (true)
Exclude&
Exclude::excludeRange(const name::Component& from, const name::Component& to)
{
if (from >= to) {
throw Error("Invalid exclude range [" +
from.toEscapedString() + ", " +
to.toEscapedString() +
"] (for single name exclude use Exclude::excludeOne)");
}
iterator newFrom = m_exclude.lower_bound(from);
if (newFrom == end() || !newFrom->second /*without ANY*/) {
std::pair<iterator, bool> fromResult = m_exclude.insert(std::make_pair(from, true));
newFrom = fromResult.first;
if (!fromResult.second) {
// this means that the lower bound is equal to the item itself. So, just update ANY flag
newFrom->second = true;
}
}
// else
// nothing special if start of the range already exists with ANY flag set
iterator newTo = m_exclude.lower_bound(to); // !newTo cannot be end()
if (newTo == newFrom || !newTo->second) {
std::pair<iterator, bool> toResult = m_exclude.insert(std::make_pair(to, false));
newTo = toResult.first;
++ newTo;
}
// else
// nothing to do really
m_exclude.erase(newTo, newFrom); // remove any intermediate node, since all of the are excluded
return *this;
}
Exclude&
Exclude::excludeAfter(const name::Component& from)
{
iterator newFrom = m_exclude.lower_bound(from);
if (newFrom == end() || !newFrom->second /*without ANY*/) {
std::pair<iterator, bool> fromResult = m_exclude.insert(std::make_pair(from, true));
newFrom = fromResult.first;
if (!fromResult.second) {
// this means that the lower bound is equal to the item itself. So, just update ANY flag
newFrom->second = true;
}
}
// else
// nothing special if start of the range already exists with ANY flag set
if (newFrom != m_exclude.begin()) {
// remove any intermediate node, since all of the are excluded
m_exclude.erase(m_exclude.begin(), newFrom);
}
return *this;
}
std::ostream&
operator<<(std::ostream& os, const Exclude& exclude)
{
bool empty = true;
for (Exclude::const_reverse_iterator i = exclude.rbegin(); i != exclude.rend(); i++) {
if (!i->first.empty()) {
if (!empty) os << ",";
os << i->first.toEscapedString();
empty = false;
}
if (i->second) {
if (!empty) os << ",";
os << "*";
empty = false;
}
}
return os;
}
} // namespace ndn