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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* @author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
* @author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_NAME_HPP
#define NDN_NAME_HPP
#include "common.hpp"
#include "name-component.hpp"
#include "encoding/block.hpp"
#include "encoding/encoding-buffer.hpp"
#include <boost/iterator/reverse_iterator.hpp>
namespace ndn {
/**
* A Name holds an array of Name::Component and represents an NDN name.
*/
class Name : public ptr_lib::enable_shared_from_this<Name> {
public:
/// @brief Error that can be thrown from the block
class Error : public name::Component::Error {
public:
Error(const std::string& what)
: name::Component::Error(what) {}
};
typedef name::Component Component;
typedef std::vector<Component> component_container;
typedef Component value_type;
typedef void allocator_type;
typedef Component& reference;
typedef const Component const_reference;
typedef Component* pointer;
typedef const Component* const_pointer;
typedef Component* iterator;
typedef const Component* const_iterator;
typedef boost::reverse_iterator<iterator> reverse_iterator;
typedef boost::reverse_iterator<const_iterator> const_reverse_iterator;
typedef component_container::difference_type difference_type;
typedef component_container::size_type size_type;
/**
* Create a new Name with no components.
*/
Name()
: m_nameBlock(Tlv::Name)
{
}
/**
* @brief Create Name object from wire block
*
* This is a more efficient equivalent for
* @code
* Name name;
* name.wireDecode(wire);
* @endcode
*/
explicit
Name(const Block& wire)
{
m_nameBlock = wire;
m_nameBlock.parse();
}
/**
* Parse the uri according to the NDN URI Scheme and create the name with the components.
* @param uri The URI string.
*/
Name(const char* uri)
{
set(uri);
}
/**
* Parse the uri according to the NDN URI Scheme and create the name with the components.
* @param uri The URI string.
*/
Name(const std::string& uri)
{
set(uri.c_str());
}
/**
* @brief Fast encoding or block size estimation
*/
template<bool T>
size_t
wireEncode(EncodingImpl<T>& block) const;
const Block&
wireEncode() const;
void
wireDecode(const Block& wire);
/**
* @brief Check if already has wire
*/
bool
hasWire() const;
/**
* Parse the uri according to the NDN URI Scheme and set the name with the components.
* @param uri The null-terminated URI string.
*/
void
set(const char *uri);
/**
* Parse the uri according to the NDN URI Scheme and set the name with the components.
* @param uri The URI string.
*/
void
set(const std::string& uri)
{
set(uri.c_str());
}
/**
* Append a new component, copying from value of length valueLength.
* @return This name so that you can chain calls to append.
*/
Name&
append(const uint8_t* value, size_t valueLength)
{
m_nameBlock.push_back(Component(value, valueLength));
return *this;
}
/**
* Append a new component, copying from value of length valueLength.
* @return This name so that you can chain calls to append.
*/
template<class InputIterator>
Name&
append(InputIterator begin, InputIterator end)
{
m_nameBlock.push_back(Component(begin, end));
return *this;
}
Name&
append(const ConstBufferPtr& value)
{
m_nameBlock.push_back(value);
return *this;
}
Name&
append(const Component& value)
{
m_nameBlock.push_back(value);
return *this;
}
/**
* @brief Append name component that represented as a string
*
* Note that this method is necessary to ensure correctness and unambiguity of
* ``append("string")`` operations (both Component and Name can be implicitly
* converted from string, each having different outcomes
*/
Name&
append(const char* value)
{
m_nameBlock.push_back(Component(value));
return *this;
}
Name&
append(const Block& value)
{
if (value.type() == Tlv::NameComponent)
m_nameBlock.push_back(value);
else
m_nameBlock.push_back(Block(Tlv::NameComponent, value));
return *this;
}
/**
* Append the components of the given name to this name.
* @param name The Name with components to append.
* @return This name so that you can chain calls to append.
*/
Name&
append(const Name& name);
/**
* Clear all the components.
*/
void
clear()
{
m_nameBlock = Block(Tlv::Name);
}
/**
* Get a new name, constructed as a subset of components.
* @param iStartComponent The index if the first component to get.
* @param nComponents The number of components starting at iStartComponent.
* @return A new name.
*/
Name
getSubName(size_t iStartComponent, size_t nComponents) const;
/**
* Get a new name, constructed as a subset of components starting at iStartComponent until the end of the name.
* @param iStartComponent The index if the first component to get.
* @return A new name.
*/
Name
getSubName(size_t iStartComponent) const;
/**
* Return a new Name with the first nComponents components of this Name.
* @param nComponents The number of prefix components. If nComponents is -N then return the prefix up
* to name.size() - N. For example getPrefix(-1) returns the name without the final component.
* @return A new Name.
*/
Name
getPrefix(int nComponents) const
{
if (nComponents < 0)
return getSubName(0, m_nameBlock.elements_size() + nComponents);
else
return getSubName(0, nComponents);
}
/**
* Encode this name as a URI.
* @return The encoded URI.
*/
std::string
toUri() const;
/**
* @brief Append a component with the number encoded as nonNegativeInteger
*
* @see http://named-data.net/doc/ndn-tlv/tlv.html#non-negative-integer-encoding
*
* @param number The non-negative number
* @return This name so that you can chain calls to append.
*/
Name&
appendNumber(uint64_t number)
{
m_nameBlock.push_back(Component::fromNumber(number));
return *this;
}
/**
* @brief An alias for appendNumber(uint64_t)
*/
Name&
appendVersion(uint64_t number)
{
return appendNumber(number);
}
/**
* @brief Append a component with the encoded version number (current UNIX timestamp
* in milliseconds)
*/
Name&
appendVersion();
/**
* @brief An alias for appendNumber(uint64_t)
*/
Name&
appendSegment(uint64_t number)
{
return appendNumber(number);
}
/**
* Check if this name has the same component count and components as the given name.
* @param name The Name to check.
* @return true if the names are equal, otherwise false.
*/
bool
equals(const Name& name) const;
/**
* Check if the N components of this name are the same as the first N components of the given name.
* @param name The Name to check.
* @return true if this matches the given name, otherwise false. This always returns true if this name is empty.
*/
bool
isPrefixOf(const Name& name) const;
//
// vector equivalent interface.
//
/**
* @brief Check if name is emtpy
*/
bool
empty() const { return m_nameBlock.elements().empty(); }
/**
* Get the number of components.
* @return The number of components.
*/
size_t
size() const { return m_nameBlock.elements_size(); }
/**
* Get the component at the given index.
* @param i The index of the component, starting from 0.
* @return The name component at the index.
*/
const Component&
get(ssize_t i) const
{
if (i >= 0)
return reinterpret_cast<const Component&>(m_nameBlock.elements()[i]);
else
return reinterpret_cast<const Component&>(m_nameBlock.elements()[size() + i]);
}
const Component&
operator[](ssize_t i) const
{
return get(i);
}
/**
* @brief Get component at the specified index
*
* Unlike get() and operator[] methods, at() checks for out of bounds
* and will throw Name::Error when it happens
*
* @throws Name::Error if index out of bounds
*/
const Component&
at(ssize_t i) const
{
if ((i >= 0 && static_cast<size_t>(i) >= size()) ||
(i < 0 && static_cast<size_t>(-i) > size()))
throw Error("Requested component does not exist (out of bounds)");
return get(i);
}
/**
* @brief Compare this to the other Name using NDN canonical ordering.
*
* If the first components of each name are not equal, this returns -1 if the first comes
* before the second using the NDN canonical ordering for name components, or 1 if it
* comes after. If they are equal, this compares the second components of each name, etc.
* If both names are the same up to the size of the shorter name, this returns -1 if the
* first name is shorter than the second or 1 if it is longer. For example, if you
* std::sort gives: /a/b/d /a/b/cc /c /c/a /bb . This is intuitive because all names with
* the prefix /a are next to each other. But it may be also be counter-intuitive because
* /c comes before /bb according to NDN canonical ordering since it is shorter. @param
* other The other Name to compare with. @return 0 If they compare equal, -1 if *this
* comes before other in the canonical ordering, or 1 if *this comes after other in the
* canonical ordering.
*
* @see http://named-data.net/doc/ndn-tlv/name.html#canonical-order
*/
int
compare(const Name& other) const;
/**
* Append the component
* @param component The component of type T.
*/
template<class T> void
push_back(const T& component)
{
append(component);
}
/**
* Check if this name has the same component count and components as the given name.
* @param name The Name to check.
* @return true if the names are equal, otherwise false.
*/
bool
operator==(const Name& name) const { return equals(name); }
/**
* Check if this name has the same component count and components as the given name.
* @param name The Name to check.
* @return true if the names are not equal, otherwise false.
*/
bool
operator!=(const Name& name) const { return !equals(name); }
/**
* Return true if this is less than or equal to the other Name in the NDN canonical ordering.
* @param other The other Name to compare with.
*
* @see http://named-data.net/doc/ndn-tlv/name.html#canonical-order
*/
bool
operator<=(const Name& other) const { return compare(other) <= 0; }
/**
* Return true if this is less than the other Name in the NDN canonical ordering.
* @param other The other Name to compare with.
*
* @see http://named-data.net/doc/ndn-tlv/name.html#canonical-order
*/
bool
operator<(const Name& other) const { return compare(other) < 0; }
/**
* Return true if this is less than or equal to the other Name in the NDN canonical ordering.
* @param other The other Name to compare with.
*
* @see http://named-data.net/doc/ndn-tlv/name.html#canonical-order
*/
bool
operator>=(const Name& other) const { return compare(other) >= 0; }
/**
* Return true if this is greater than the other Name in the NDN canonical ordering.
* @param other The other Name to compare with.
*
* @see http://named-data.net/doc/ndn-tlv/name.html#canonical-order
*/
bool
operator>(const Name& other) const { return compare(other) > 0; }
//
// Iterator interface to name components.
//
/**
* Begin iterator (const).
*/
const_iterator
begin() const
{
return reinterpret_cast<const_iterator>(&*m_nameBlock.elements().begin());
}
/**
* End iterator (const).
*
* @todo Check if this crash when there are no elements in the buffer
*/
const_iterator
end() const
{
return reinterpret_cast<const_iterator>(&*m_nameBlock.elements().end());
}
/**
* Reverse begin iterator (const).
*/
const_reverse_iterator
rbegin() const
{
return const_reverse_iterator(end());
}
/**
* Reverse end iterator (const).
*/
const_reverse_iterator
rend() const
{
return const_reverse_iterator(begin());
}
private:
mutable Block m_nameBlock;
};
inline std::ostream&
operator<<(std::ostream& os, const Name& name)
{
if (name.empty())
{
os << "/";
}
else
{
for (Name::const_iterator i = name.begin(); i != name.end(); i++) {
os << "/";
i->toEscapedString(os);
}
}
return os;
}
inline std::string
Name::toUri() const
{
std::ostringstream os;
os << *this;
return os.str();
}
inline std::istream&
operator>>(std::istream& is, Name& name)
{
std::string inputString;
is >> inputString;
name.set(inputString);
return is;
}
inline void
Name::set(const char* uri_cstr)
{
clear();
std::string uri = uri_cstr;
trim(uri);
if (uri.size() == 0)
return;
size_t iColon = uri.find(':');
if (iColon != std::string::npos) {
// Make sure the colon came before a '/'.
size_t iFirstSlash = uri.find('/');
if (iFirstSlash == std::string::npos || iColon < iFirstSlash) {
// Omit the leading protocol such as ndn:
uri.erase(0, iColon + 1);
trim(uri);
}
}
// Trim the leading slash and possibly the authority.
if (uri[0] == '/') {
if (uri.size() >= 2 && uri[1] == '/') {
// Strip the authority following "//".
size_t iAfterAuthority = uri.find('/', 2);
if (iAfterAuthority == std::string::npos)
// Unusual case: there was only an authority.
return;
else {
uri.erase(0, iAfterAuthority + 1);
trim(uri);
}
}
else {
uri.erase(0, 1);
trim(uri);
}
}
size_t iComponentStart = 0;
// Unescape the components.
while (iComponentStart < uri.size()) {
size_t iComponentEnd = uri.find("/", iComponentStart);
if (iComponentEnd == std::string::npos)
iComponentEnd = uri.size();
Component component = Component::fromEscapedString(&uri[0], iComponentStart, iComponentEnd);
// Ignore illegal components. This also gets rid of a trailing '/'.
if (!component.empty())
append(Component(component));
iComponentStart = iComponentEnd + 1;
}
}
inline Name&
Name::append(const Name& name)
{
if (&name == this)
// Copying from this name, so need to make a copy first.
return append(Name(name));
for (size_t i = 0; i < name.size(); ++i)
append(name.at(i));
return *this;
}
inline Name&
Name::appendVersion()
{
appendNumber(time::toUnixTimestamp(time::system_clock::now()).count());
return *this;
}
inline Name
Name::getSubName(size_t iStartComponent, size_t nComponents) const
{
Name result;
size_t iEnd = iStartComponent + nComponents;
for (size_t i = iStartComponent; i < iEnd && i < size(); ++i)
result.append(at(i));
return result;
}
inline Name
Name::getSubName(size_t iStartComponent) const
{
Name result;
for (size_t i = iStartComponent; i < size(); ++i)
result.append(at(i));
return result;
}
inline bool
Name::equals(const Name& name) const
{
if (size() != name.size())
return false;
for (size_t i = 0; i < size(); ++i) {
if (at(i) != name.at(i))
return false;
}
return true;
}
inline bool
Name::isPrefixOf(const Name& name) const
{
// This name is longer than the name we are checking it against.
if (size() > name.size())
return false;
// Check if at least one of given components doesn't match.
for (size_t i = 0; i < size(); ++i) {
if (at(i) != name.at(i))
return false;
}
return true;
}
inline int
Name::compare(const Name& other) const
{
for (size_t i = 0; i < size() && i < other.size(); ++i) {
int comparison = at(i).compare(other.at(i));
if (comparison == 0)
// The components at this index are equal, so check the next components.
continue;
// Otherwise, the result is based on the components at this index.
return comparison;
}
// The components up to min(this.size(), other.size()) are equal, so the shorter name is less.
if (size() < other.size())
return -1;
else if (size() > other.size())
return 1;
else
return 0;
}
template<bool T>
inline size_t
Name::wireEncode(EncodingImpl<T>& blk) const
{
size_t total_len = 0;
for (const_reverse_iterator i = rbegin();
i != rend();
++i)
{
total_len += i->wireEncode(blk);
}
total_len += blk.prependVarNumber(total_len);
total_len += blk.prependVarNumber(Tlv::Name);
return total_len;
}
inline const Block&
Name::wireEncode() const
{
if (m_nameBlock.hasWire())
return m_nameBlock;
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_nameBlock = buffer.block();
m_nameBlock.parse();
return m_nameBlock;
}
inline void
Name::wireDecode(const Block& wire)
{
if (wire.type() != Tlv::Name)
throw Tlv::Error("Unexpected TLV type when decoding Name");
m_nameBlock = wire;
m_nameBlock.parse();
}
inline bool
Name::hasWire() const
{
return m_nameBlock.hasWire();
}
} // namespace ndn
#endif