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/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_NAME_HPP
#define NDN_NAME_HPP
#include <vector>
#include <string>
#include <sstream>
#include "c/name.h"
#include "encoding/binary-xml-wire-format.hpp"
#include "util/blob.hpp"
namespace ndn {
class Name {
public:
/**
* A Name::Component is holds a read-only name component value.
*/
class Component {
public:
/**
* Create a new Name::Component with a null value.
*/
Component()
{
}
/**
* Create a new Name::Component, copying the given value.
* @param value The value byte array.
*/
Component(const std::vector<uint8_t>& value)
: value_(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)
: value_(value, valueLen)
{
}
/**
* 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 Blob &value)
: value_(value)
{
}
/**
* Set the componentStruct to point to this component, without copying any memory.
* WARNING: The resulting pointer in componentStruct is invalid after a further use of this object which could reallocate memory.
* @param componentStruct The C ndn_NameComponent struct to receive the pointer.
*/
void
get(struct ndn_NameComponent& componentStruct) const
{
componentStruct.valueLength = value_.size();
if (value_.size() > 0)
componentStruct.value = (uint8_t*)value_.buf();
else
componentStruct.value = 0;
}
const Blob&
getValue() const { return value_; }
/**
* 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 value the buffer with the value to escape
* @param result the string stream to write to.
*/
void
toEscapedString(std::ostringstream& result) const
{
Name::toEscapedString(*value_, 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(*value_);
}
/**
* Make a component 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 this component value was not changed, and
* 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 component value as a Blob, or a Blob with a null pointer if escapedString is not a valid escaped component.
*/
static Blob
makeFromEscapedString(const char *escapedString, size_t beginOffset, size_t endOffset);
/**
* Make a component as the encoded segment number.
* @param segment The segment number.
* @return The component value as a Blob.
*/
static Blob
makeSegment(unsigned long segment);
private:
Blob value_;
};
/**
* 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)
{
}
/**
* 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());
}
/**
* Set the nameStruct to point to the components in this name, without copying any memory.
* WARNING: The resulting pointers in nameStruct are invalid after a further use of this object which could reallocate memory.
* @param nameStruct A C ndn_Name struct where the components array is already allocated.
*/
void
get(struct ndn_Name& nameStruct) const;
/**
* Clear this name, and set the components by copying from the name struct.
* @param nameStruct A C ndn_Name struct
*/
void
set(const struct ndn_Name& nameStruct);
/**
* Parse the uri according to the NDN URI Scheme and set the name with the components.
* @param uri The URI string.
*/
void
set(const char *uri);
/**
* 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 std::vector<uint8_t>& value)
{
components_.push_back(value);
return *this;
}
Name&
append(const Blob &value)
{
components_.push_back(value);
return *this;
}
Name&
append(const Component &value)
{
components_.push_back(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);
/**
* @deprecated Use append.
*/
Name&
appendComponent(const uint8_t *value, size_t valueLength)
{
return append(value, valueLength);
}
/**
* @deprecated Use append.
*/
Name&
appendComponent(const std::vector<uint8_t>& value)
{
return append(value);
}
/**
* @deprecated Use append.
*/
Name&
appendComponent(const Blob &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 std::vector<uint8_t>& value)
{
return append(value);
}
/**
* @deprecated Use append.
*/
Name&
addComponent(const Blob &value)
{
return append(value);
}
/**
* Clear all the components.
*/
void
clear() {
components_.clear();
}
/**
* Get the number of components.
* @return The number of components.
*/
size_t
getComponentCount() const {
return components_.size();
}
const Component&
getComponent(size_t i) const { return components_[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.
* @return A new Name.
*/
Name
getPrefix(size_t nComponents) const
{
return getSubName(0, nComponents);
}
/**
* Encode this name as a URI.
* @return The encoded URI.
*/
std::string
toUri() const;
/**
* @deprecated Use toUri().
*/
std::string
to_uri() const
{
return toUri();
}
/**
* 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(unsigned long segment)
{
components_.push_back(Component(Component::makeSegment(segment)));
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
match(const Name& name) const;
/**
* 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::ostringstream& 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);
private:
std::vector<Component> components_;
};
}
#endif