ndn-cpp/interest.hpp

/**
 * @author: Jeff Thompson
 * See COPYING for copyright and distribution information.
 */

#ifndef NDN_INTEREST_HPP
#define NDN_INTEREST_HPP

#include "name.hpp"
#include "publisher-public-key-digest.hpp"
#include "c/interest.h"

namespace ndn {
  
/**
 * An ExcludeEntry holds an ndn_ExcludeType, and if it is a COMPONENT, it holds the component value.
 */
class ExcludeEntry {
public:
  /**
   * Create an ExcludeEntry of type ndn_Exclude_ANY
   */
  ExcludeEntry()
  : type_(ndn_Exclude_ANY)
  {    
  }
  
  /**
   * Create an ExcludeEntry of type ndn_Exclude_COMPONENT
   */
  ExcludeEntry(unsigned char *component, unsigned int componentLen) 
  : type_(ndn_Exclude_COMPONENT), component_(component, componentLen)
  {
  }
  
  /**
   * Set the type in the excludeEntryStruct and to point to this component, without copying any memory.
   * WARNING: The resulting pointer in excludeEntryStruct is invalid after a further use of this object which could reallocate memory.
   * @param excludeEntryStruct the C ndn_NameComponent struct to receive the pointer
   */
  void get(struct ndn_ExcludeEntry& excludeEntryStruct) const 
  {
    excludeEntryStruct.type = type_;
    if (type_ == ndn_Exclude_COMPONENT)
      component_.get(excludeEntryStruct.component);
  }
  
  ndn_ExcludeType getType() const { return type_; }
  
  const Name::Component& getComponent() const { return component_; }
  
private:
  ndn_ExcludeType type_;
  Name::Component component_; /**< only used if type_ is ndn_Exclude_COMPONENT */
}; 
  
/**
 * An Exclude holds a vector of ExcludeEntry.
 */
class Exclude {
public:
  /**
   * Create a new Exclude with no entries.
   */
  Exclude() {
  }
  
  unsigned int getEntryCount() const {
    return entries_.size();
  }
  
  const ExcludeEntry& getEntry(unsigned int i) const { return entries_[i]; }
  
  /**
   * Set the excludeStruct to point to the entries in this Exclude, without copying any memory.
   * WARNING: The resulting pointers in excludeStruct are invalid after a further use of this object which could reallocate memory.
   * @param excludeStruct a C ndn_Exclude struct where the entries array is already allocated
   */
  void get(struct ndn_Exclude& excludeStruct) const;
  
  /**
   * Clear this Exclude, and set the entries by copying from the ndn_Exclude struct.
   * @param excludeStruct a C ndn_Exclude struct
   */
  void set(const struct ndn_Exclude& excludeStruct);

  /**
   * Add a new entry of type ndn_Exclude_ANY
   */
  void addAny()
  {    
    entries_.push_back(ExcludeEntry());
  }
  
  /**
   * Add a new entry of type ndn_Exclude_COMPONENT, copying from component of length compnentLength
   */
  void addComponent(unsigned char *component, unsigned int componentLen) 
  {
    entries_.push_back(ExcludeEntry(component, componentLen));
  }
  
  /**
   * Clear all the entries.
   */
  void clear() {
    entries_.clear();
  }
  
  /**
   * Encode this Exclude with elements separated by "," and ndn_Exclude_ANY shown as "*".
   * @return the URI string
   */
  std::string toUri() const;
  
private:
  std::vector<ExcludeEntry> entries_;
};

/**
 * An Interest holds a Name and other fields for an interest.
 */
class Interest {
public:    
  Interest(const Name& name, int minSuffixComponents, int maxSuffixComponents, 
    const PublisherPublicKeyDigest& publisherPublicKeyDigest, const Exclude& exclude, int childSelector, int answerOriginKind, 
    int scope, double interestLifetimeMilliseconds, const std::vector<unsigned char>& nonce) 
  : name_(name), minSuffixComponents_(minSuffixComponents), maxSuffixComponents_(maxSuffixComponents),
  publisherPublicKeyDigest_(publisherPublicKeyDigest), exclude_(exclude), childSelector_(childSelector), 
  answerOriginKind_(answerOriginKind), scope_(scope), interestLifetimeMilliseconds_(interestLifetimeMilliseconds),
  nonce_(nonce)
  {
  }

  Interest(const Name& name, int minSuffixComponents, int maxSuffixComponents, 
    const PublisherPublicKeyDigest& publisherPublicKeyDigest, const Exclude& exclude, int childSelector, int answerOriginKind, 
    int scope, double interestLifetimeMilliseconds) 
  : name_(name), minSuffixComponents_(minSuffixComponents), maxSuffixComponents_(maxSuffixComponents),
  publisherPublicKeyDigest_(publisherPublicKeyDigest), exclude_(exclude), childSelector_(childSelector), 
  answerOriginKind_(answerOriginKind), scope_(scope), interestLifetimeMilliseconds_(interestLifetimeMilliseconds)
  {
  }

  Interest(const Name& name, double interestLifetimeMilliseconds) 
  : name_(name)
  {
    construct();
    interestLifetimeMilliseconds_ = interestLifetimeMilliseconds;
  }

  Interest(const Name& name) 
  : name_(name)
  {
    construct();
  }

  Interest() 
  {
    construct();
  }
  
  Blob wireEncode(WireFormat& wireFormat = *WireFormat::getDefaultWireFormat()) const 
  {
    return wireFormat.encodeInterest(*this);
  }
  void wireDecode(const unsigned char *input, unsigned int inputLength, WireFormat& wireFormat = *WireFormat::getDefaultWireFormat()) 
  {
    wireFormat.decodeInterest(*this, input, inputLength);
  }
  void wireDecode(const std::vector<unsigned char>& input, WireFormat& wireFormat = *WireFormat::getDefaultWireFormat()) 
  {
    wireDecode(&input[0], input.size(), wireFormat);
  }
  
  /**
   * Set the interestStruct to point to the components in this interest, without copying any memory.
   * WARNING: The resulting pointers in interestStruct are invalid after a further use of this object which could reallocate memory.
   * @param interestStruct a C ndn_Interest struct where the name components array is already allocated.
   */
  void get(struct ndn_Interest& interestStruct) const;

  Name& getName() { return name_; }
  const Name& getName() const { return name_; }
  
  int getMinSuffixComponents() const { return minSuffixComponents_; }
  
  int getMaxSuffixComponents() const { return maxSuffixComponents_; }
  
  PublisherPublicKeyDigest& getPublisherPublicKeyDigest() { return publisherPublicKeyDigest_; }
  const PublisherPublicKeyDigest& getPublisherPublicKeyDigest() const { return publisherPublicKeyDigest_; }

  Exclude& getExclude() { return exclude_; }
  const Exclude& getExclude() const { return exclude_; }
  
  int getChildSelector() const { return childSelector_; }

  int getAnswerOriginKind() const { return answerOriginKind_; }

  int getScope() const { return scope_; }

  double getInterestLifetimeMilliseconds() const { return interestLifetimeMilliseconds_; }

  const Blob& getNonce() const { return nonce_; }
  
  /**
   * Clear this interest, and set the values by copying from the interest struct.
   * @param interestStruct a C ndn_Interest struct
   */
  void set(const struct ndn_Interest& interestStruct);
  
  void setMinSuffixComponents(int value) { minSuffixComponents_ = value; }
  
  void setMaxSuffixComponents(int value) { maxSuffixComponents_ = value; }
  
  void setChildSelector(int value) { childSelector_ = value; }

  void setAnswerOriginKind(int value) { answerOriginKind_ = value; }

  void setScope(int value) { scope_ = value; }

  void setInterestLifetimeMilliseconds(double value) { interestLifetimeMilliseconds_ = value; }

  void setNonce(const std::vector<unsigned char>& value) { nonce_ = value; }
  
private:
  void construct() 
  {
    minSuffixComponents_ = -1;
    maxSuffixComponents_ = -1;  
    childSelector_ = -1;
    answerOriginKind_ = -1;
    scope_ = -1;
    interestLifetimeMilliseconds_ = -1.0;
  }
  
  Name name_;
  int minSuffixComponents_;
  int maxSuffixComponents_;  
  PublisherPublicKeyDigest publisherPublicKeyDigest_;
  Exclude exclude_;
  int childSelector_;
  int answerOriginKind_;
  int scope_;
  double interestLifetimeMilliseconds_;
  Blob nonce_;
};
  
}

#endif