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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/*
* Copyright (c) 2013, Regents of the University of California
* Alexander Afanasyev
*
* BSD license, See the LICENSE file for more information
*
* Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
*/
#ifndef NDN_EXCLUDE_H
#define NDN_EXCLUDE_H
#include "name-component.hpp"
namespace ndn {
/**
* @brief Class to represent Exclude component in NDN interests
*/
class Exclude
{
public:
class Error : public Tlv::Error
{
public:
explicit
Error(const std::string& what)
: Tlv::Error(what)
{
}
};
typedef std::map< name::Component, bool /*any*/, std::greater<name::Component> > exclude_type;
typedef exclude_type::iterator iterator;
typedef exclude_type::const_iterator const_iterator;
typedef exclude_type::reverse_iterator reverse_iterator;
typedef exclude_type::const_reverse_iterator const_reverse_iterator;
/**
* @brief Default constructor an empty exclude
*/
Exclude();
/**
* @brief Create from wire encoding
*/
explicit
Exclude(const Block& wire)
{
wireDecode(wire);
}
/**
* @brief Fast encoding or block size estimation
*/
template<bool T>
inline size_t
wireEncode(EncodingImpl<T>& block) const;
/**
* @brief Encode to a wire format
*/
inline const Block&
wireEncode() const;
/**
* @brief Decode from the wire format
*/
inline void
wireDecode(const Block& wire);
///////////////////////////////////////////////////////////////////////////////
/**
* @brief Check if name component is excluded
* @param comp Name component to check against exclude filter
*/
bool
isExcluded(const name::Component& comp) const;
/**
* @brief Exclude specific name component
* @param comp component to exclude
* @returns *this to allow chaining
*/
Exclude&
excludeOne(const name::Component& comp);
/**
* @brief Exclude components from range [from, to]
* @param from first element of the range
* @param to last element of the range
* @returns *this to allow chaining
*/
Exclude&
excludeRange(const name::Component& from, const name::Component& to);
/**
* @brief Exclude all components from range [/, to]
* @param to last element of the range
* @returns *this to allow chaining
*/
inline Exclude&
excludeBefore(const name::Component& to);
/**
* @brief Exclude all components from range [from, +Inf]
* @param to last element of the range
* @returns *this to allow chaining
*/
Exclude&
excludeAfter(const name::Component& from);
/**
* @brief Method to directly append exclude element
* @param name excluded name component
* @param any flag indicating if there is a postfix ANY component after the name
*
* This method is used during conversion from wire format of exclude filter
*
* If there is an error with ranges (e.g., order of components is wrong) an exception is thrown
*/
inline void
appendExclude(const name::Component& name, bool any);
/**
* @brief Check if exclude filter is empty
*/
inline bool
empty() const;
/**
* @brief Clear the exclude filter
*/
inline void
clear();
/**
* @brief Get number of exclude terms
*/
inline size_t
size() const;
/**
* @brief Get begin iterator of the exclude terms
*/
inline const_iterator
begin() const;
/**
* @brief Get end iterator of the exclude terms
*/
inline const_iterator
end() const;
/**
* @brief Get begin iterator of the exclude terms
*/
inline const_reverse_iterator
rbegin() const;
/**
* @brief Get end iterator of the exclude terms
*/
inline const_reverse_iterator
rend() const;
/**
* @brief Get escaped string representation (e.g., for use in URI) of the exclude filter
*/
inline std::string
toUri() const;
private:
Exclude&
excludeRange(iterator fromLowerBound, iterator toLowerBound);
private:
exclude_type m_exclude;
mutable Block m_wire;
};
std::ostream&
operator<<(std::ostream& os, const Exclude& name);
inline Exclude&
Exclude::excludeBefore(const name::Component& to)
{
return excludeRange(name::Component(), to);
}
inline void
Exclude::appendExclude(const name::Component& name, bool any)
{
m_exclude[name] = any;
}
inline bool
Exclude::empty() const
{
return m_exclude.empty();
}
inline void
Exclude::clear()
{
m_exclude.clear();
}
inline size_t
Exclude::size() const
{
return m_exclude.size();
}
inline Exclude::const_iterator
Exclude::begin() const
{
return m_exclude.begin();
}
inline Exclude::const_iterator
Exclude::end() const
{
return m_exclude.end();
}
inline Exclude::const_reverse_iterator
Exclude::rbegin() const
{
return m_exclude.rbegin();
}
inline Exclude::const_reverse_iterator
Exclude::rend() const
{
return m_exclude.rend();
}
inline std::string
Exclude::toUri() const
{
std::ostringstream os;
os << *this;
return os.str();
}
template<bool T>
inline size_t
Exclude::wireEncode(EncodingImpl<T>& block) const
{
size_t totalLength = 0;
// Exclude ::= EXCLUDE-TYPE TLV-LENGTH Any? (NameComponent (Any)?)+
// Any ::= ANY-TYPE TLV-LENGTH(=0)
for (Exclude::const_iterator i = m_exclude.begin(); i != m_exclude.end(); i++)
{
if (i->second)
{
totalLength += prependBooleanBlock(block, Tlv::Any);
}
if (!i->first.empty())
{
totalLength += i->first.wireEncode(block);
}
}
totalLength += block.prependVarNumber(totalLength);
totalLength += block.prependVarNumber(Tlv::Exclude);
return totalLength;
}
inline const Block&
Exclude::wireEncode() const
{
if (m_wire.hasWire())
return m_wire;
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_wire = buffer.block();
return m_wire;
}
inline void
Exclude::wireDecode(const Block& wire)
{
m_wire = wire;
m_wire.parse();
// Exclude ::= EXCLUDE-TYPE TLV-LENGTH Any? (NameComponent (Any)?)+
// Any ::= ANY-TYPE TLV-LENGTH(=0)
Block::element_const_iterator i = m_wire.elements_begin();
if (i->type() == Tlv::Any)
{
appendExclude(name::Component(), true);
++i;
}
while (i != m_wire.elements_end())
{
if (i->type() != Tlv::NameComponent)
throw Error("Incorrect format of Exclude filter");
name::Component excludedComponent(i->value(), i->value_size());
++i;
if (i != m_wire.elements_end())
{
if (i->type() == Tlv::Any)
{
appendExclude(excludedComponent, true);
++i;
}
else
{
appendExclude(excludedComponent, false);
}
}
else
{
appendExclude(excludedComponent, false);
}
}
}
} // ndn
#endif // NDN_EXCLUDE_H