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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 <vector>
#include <string>
#include <sstream>
#include <string.h>
#include "encoding/block.hpp"
namespace ndn {
/**
* A Name holds an array of Name::Component and represents an NDN name.
*/
class Name {
public:
/**
* A Name::Component holds a read-only name component value.
*/
class Component : private ConstBufferPtr
{
public:
/**
* Create a new Name::Component with a null value.
*/
Component()
{
}
// copy constructor OK
/**
* Create a new Name::Component, taking another pointer to the Blob value.
* @param value A blob with a pointer to an immutable array. The pointer is copied.
*/
Component(const ConstBufferPtr &buffer)
: ConstBufferPtr (buffer)
{
}
/**
* Create a new Name::Component, copying the given value.
* @param value The value byte array.
*/
Component(const Buffer& value)
: ConstBufferPtr (new Buffer(value))
{
}
/**
* Create a new Name::Component, copying the given value.
* @param value Pointer to the value byte array.
* @param valueLen Length of value.
*/
Component(const uint8_t *value, size_t valueLen)
: ConstBufferPtr (new Buffer(value, valueLen))
{
}
template<class InputIterator>
Component(InputIterator begin, InputIterator end)
: ConstBufferPtr (new Buffer(begin, end))
{
}
const Buffer&
getValue() const { return **this; }
/**
* Write this component value to result, escaping characters according to the NDN URI Scheme.
* This also adds "..." to a value with zero or more ".".
* @param result the string stream to write to.
*/
void
toEscapedString(std::ostream& result) const
{
Name::toEscapedString(**this, result);
}
/**
* Convert this component value by escaping characters according to the NDN URI Scheme.
* This also adds "..." to a value with zero or more ".".
* @return The escaped string.
*/
std::string
toEscapedString() const
{
return Name::toEscapedString(**this);
}
/**
* Interpret this name component as a network-ordered number and return an integer.
* @return The integer number.
*/
uint64_t
toNumber() const;
/**
* Interpret this name component as a network-ordered number with a marker and return an integer.
* @param marker The required first byte of the component.
* @return The integer number.
* @throw runtime_error If the first byte of the component does not equal the marker.
*/
uint64_t
toNumberWithMarker(uint8_t marker) const;
/**
* Interpret this name component as a segment number according to NDN name conventions (a network-ordered number
* where the first byte is the marker 0x00).
* @return The integer segment number.
* @throw runtime_error If the first byte of the component is not the expected marker.
*/
uint64_t
toSegment() const
{
return toNumberWithMarker(0x00);
}
/**
* @deprecated Use toSegment.
*/
uint64_t
toSeqNum() const
{
return toSegment();
}
/**
* Interpret this name component as a version number according to NDN name conventions (a network-ordered number
* where the first byte is the marker 0xFD). Note that this returns the exact number from the component
* without converting it to a time representation.
* @return The integer segment number.
* @throw runtime_error If the first byte of the component is not the expected marker.
*/
uint64_t
toVersion() const
{
return toNumberWithMarker(0xFD);
}
/**
* Create a component whose value is the network-ordered encoding of the number.
* Note: if the number is zero, the result is empty.
* @param number The number to be encoded.
* @return The component value.
*/
static Component
fromNumber(uint64_t number);
/**
* Create a component whose value is the marker appended with the network-ordered encoding of the number.
* Note: if the number is zero, no bytes are used for the number - the result will have only the marker.
* @param number The number to be encoded.
* @param marker The marker to use as the first byte of the component.
* @return The component value.
*/
static Component
fromNumberWithMarker(uint64_t number, uint8_t marker);
/**
* Check if this is the same component as other.
* @param other The other Component to compare with.
* @return true if the components are equal, otherwise false.
*/
bool
equals(const Component& other) const
{
return **this == *other;
}
bool
empty() const
{
return !*this || (*this)->empty();
}
/**
* Check if this is the same component as other.
* @param other The other Component to compare with.
* @return true if the components are equal, otherwise false.
*/
bool
operator == (const Component& other) const { return equals(other); }
/**
* Check if this is not the same component as other.
* @param other The other Component to compare with.
* @return true if the components are not equal, otherwise false.
*/
bool
operator != (const Component& other) const { return !equals(other); }
/**
* Compare this to the other Component using NDN canonical ordering.
* @param other The other Component 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/0.2/technical/CanonicalOrder.html
*/
int
compare(const Component& other) const;
/**
* Return true if this is less than or equal to the other Component in the NDN canonical ordering.
* @param other The other Component to compare with.
*
* @see http://named-data.net/doc/0.2/technical/CanonicalOrder.html
*/
bool
operator <= (const Component& other) const { return compare(other) <= 0; }
/**
* Return true if this is less than the other Component in the NDN canonical ordering.
* @param other The other Component to compare with.
*
* @see http://named-data.net/doc/0.2/technical/CanonicalOrder.html
*/
bool
operator < (const Component& other) const { return compare(other) < 0; }
/**
* Return true if this is less than or equal to the other Component in the NDN canonical ordering.
* @param other The other Component to compare with.
*
* @see http://named-data.net/doc/0.2/technical/CanonicalOrder.html
*/
bool
operator >= (const Component& other) const { return compare(other) >= 0; }
/**
* Return true if this is greater than the other Component in the NDN canonical ordering.
* @param other The other Component to compare with.
*
* @see http://named-data.net/doc/0.2/technical/CanonicalOrder.html
*/
bool
operator > (const Component& other) const { return compare(other) > 0; }
};
/**
* Create a new Name with no components.
*/
Name() {
}
/**
* Create a new Name, copying the name components.
* @param components A vector of Component
*/
Name(const std::vector<Component>& components)
: components_(components)
{
}
Name(const Block &name)
{
for (Block::element_const_iterator i = name.getAll().begin();
i != name.getAll().end();
++i)
{
append(Component(i->value_begin(), i->value_end()));
}
}
/**
* 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());
}
const Block &
wireEncode() 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)
{
components_.push_back(Component(value, valueLength));
return *this;
}
/**
* Append a new component, copying from value.
* @return This name so that you can chain calls to append.
*/
Name&
append(const Buffer& value)
{
components_.push_back(value);
return *this;
}
Name&
append(const ConstBufferPtr &value)
{
components_.push_back(value);
return *this;
}
Name&
append(const Component &value)
{
components_.push_back(value);
return *this;
}
Name&
append(const Block &value)
{
components_.push_back(Component(value.begin(), value.end()));
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);
/**
* @deprecated Use append.
*/
Name&
appendComponent(const uint8_t *value, size_t valueLength)
{
return append(value, valueLength);
}
/**
* @deprecated Use append.
*/
Name&
appendComponent(const Buffer& value)
{
return append(value);
}
/**
* @deprecated Use append.
*/
Name&
appendComponent(const ConstBufferPtr &value)
{
return append(value);
}
/**
* @deprecated Use append.
*/
Name&
addComponent(const uint8_t *value, size_t valueLength)
{
return append(value, valueLength);
}
/**
* @deprecated Use append.
*/
Name&
addComponent(const Buffer& value)
{
return append(value);
}
/**
* @deprecated Use append.
*/
Name&
addComponent(const ConstBufferPtr &value)
{
return append(value);
}
/**
* Clear all the components.
*/
void
clear() {
components_.clear();
}
/**
* @deprecated use size().
*/
size_t
getComponentCount() const { return size(); }
/**
* @deprecated Use get(i).
*/
const Component&
getComponent(size_t i) const { return get(i); }
/**
* 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, components_.size() + nComponents);
else
return getSubName(0, nComponents);
}
/**
* Encode this name as a URI.
* @return The encoded URI.
*/
std::string
toUri() const;
/**
* Append a component with the encoded segment number.
* @param segment The segment number.
* @return This name so that you can chain calls to append.
*/
Name&
appendSegment(uint64_t segment)
{
components_.push_back(Component::fromNumberWithMarker(segment, 0x00));
return *this;
}
/**
* Append a component with the encoded version number.
* Note that this encodes the exact value of version without converting from a time representation.
* @param version The version number.
* @return This name so that you can chain calls to append.
*/
Name&
appendVersion(uint64_t version)
{
components_.push_back(Component::fromNumberWithMarker(version, 0xFD));
return *this;
}
/**
* 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;
bool
match(const Name& name) const
{
return isPrefixOf(name);
}
/**
* Make a Blob value by decoding the escapedString between beginOffset and endOffset according to the NDN URI Scheme.
* If the escaped string is "", "." or ".." then return a Blob with a null pointer,
* which means the component should be skipped in a URI name.
* @param escapedString The escaped string. It does not need to be null-terminated because we only scan to endOffset.
* @param beginOffset The offset in escapedString of the beginning of the portion to decode.
* @param endOffset The offset in escapedString of the end of the portion to decode.
* @return The Blob value. If the escapedString is not a valid escaped component, then the Blob is a null pointer.
*/
static Component
fromEscapedString(const char *escapedString, size_t beginOffset, size_t endOffset);
/**
* Make a Blob value by decoding the escapedString according to the NDN URI Scheme.
* If the escaped string is "", "." or ".." then return a Blob with a null pointer,
* which means the component should be skipped in a URI name.
* @param escapedString The null-terminated escaped string.
* @return The Blob value. If the escapedString is not a valid escaped component, then the Blob is a null pointer.
*/
static Component
fromEscapedString(const char *escapedString);
/**
* Make a Blob value by decoding the escapedString according to the NDN URI Scheme.
* If the escaped string is "", "." or ".." then return a Blob with a null pointer,
* which means the component should be skipped in a URI name.
* @param escapedString The escaped string.
* @return The Blob value. If the escapedString is not a valid escaped component, then the Blob is a null pointer.
*/
static Component
fromEscapedString(const std::string& escapedString) { return fromEscapedString(escapedString.c_str()); }
/**
* Write the value to result, escaping characters according to the NDN URI Scheme.
* This also adds "..." to a value with zero or more ".".
* @param value the buffer with the value to escape
* @param result the string stream to write to.
*/
static void
toEscapedString(const std::vector<uint8_t>& value, std::ostream& result);
/**
* Convert the value by escaping characters according to the NDN URI Scheme.
* This also adds "..." to a value with zero or more ".".
* @param value the buffer with the value to escape
* @return The escaped string.
*/
static std::string
toEscapedString(const std::vector<uint8_t>& value);
//
// vector equivalent interface.
//
/**
* @brief Check if name is emtpy
*/
bool
empty() const { return components_.empty(); }
/**
* Get the number of components.
* @return The number of components.
*/
size_t
size() const { return components_.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 components_[i];
else
return components_[size() + i];
}
const Component&
operator [] (int i) const
{
return get(i);
}
/**
* 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); }
/**
* Compare two names for "less than" using breadth first. If the first components of each name are not equal,
* this returns true if the first comes before the second using the NDN canonical ordering for name components.
* 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 true if the first name is shorter than the second. For example, if you
* use breadthFirstLess in std::sort, it 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. Note: We don't define this directly as the Name
* less than operation because there are other valid ways to sort names.
* @param name1 The first name to compare.
* @param name2 The second name to compare.
* @return True if the first name is less than the second using breadth first comparison.
*/
static bool
breadthFirstLess(const Name& name1, const Name& name2);
/**
* Name::BreadthFirstLess is a function object which calls breadthFirstLess, for use as the "less" operator in map, etc.
* For example, you can use Name as the key type in a map as follows: map<Name, int, Name::BreadthFirstLess>.
*/
struct BreadthFirstLess {
bool operator() (const Name& name1, const Name& name2) const { return breadthFirstLess(name1, name2); }
};
//
// Iterator interface to name components.
//
typedef std::vector<Component>::iterator iterator;
typedef std::vector<Component>::const_iterator const_iterator;
typedef std::vector<Component>::reverse_iterator reverse_iterator;
typedef std::vector<Component>::const_reverse_iterator const_reverse_iterator;
typedef std::vector<Component>::reference reference;
typedef std::vector<Component>::const_reference const_reference;
typedef Component value_type;
/**
* Begin iterator (const).
*/
const_iterator
begin() const { return components_.begin(); }
/**
* Begin iterator.
*/
iterator
begin() { return components_.begin(); }
/**
* End iterator (const).
*/
const_iterator
end() const { return components_.end(); }
/**
* End iterator.
*/
iterator
end() { return components_.end(); }
/**
* Reverse begin iterator (const).
*/
const_reverse_iterator
rbegin() const { return components_.rbegin(); }
/**
* Reverse begin iterator.
*/
reverse_iterator
rbegin() { return components_.rbegin(); }
/**
* Reverse end iterator (const).
*/
const_reverse_iterator
rend() const { return components_.rend(); }
/**
* Reverse end iterator.
*/
reverse_iterator
rend() { return components_.rend(); }
private:
std::vector<Component> components_;
mutable Block wire_;
};
std::ostream &
operator << (std::ostream &os, const Name &name);
inline std::string
Name::toUri() const
{
std::ostringstream os;
os << *this;
return os.str();
}
}
#endif