// -*- C++ -*-

//=============================================================================
/**
 *  @file    Local_Locator.h
 *
 *  @author Nanbor Wang
 */
//=============================================================================


#ifndef ACE_LOCAL_LOCATOR_H
#define ACE_LOCAL_LOCATOR_H

#include "URL_Locator.h"
#include "ace/Containers.h"

#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */

#include "ID_Generator.h"

/**
 * @class ACE_URL_Record
 *
 * @brief A URL Record.
 *
 * A record placed in URL repository.  Notice that
 * both member pointers are own by URL_Record.
 * They will get deallocated when the object goes
 * out of scope.
 */
class ACE_Svc_Export ACE_URL_Record
{
  /**
   * We are making ACE_Node as friend class because we don't want
   * others to access default constructor and pushing in an invalid
   * record.  However, container classes need to use default constructor
   * for its head record.
   */
  friend class ACE_URL_Local_Locator;
  friend class ACE_Node<ACE_URL_Record>;
public:
  /// ctor.
  ACE_URL_Record (ACE_URL_Offer *offer);

  /// dtor.
  ~ACE_URL_Record (void);

  /// Two records are equal if they have the same offer id.
  bool operator== (const ACE_URL_Record &rhs) const;

  /// Unequal, complement of equal.
  bool operator!= (const ACE_URL_Record &rhs) const;


private:
  /// Default ctor.  This is put here to prevent users from
  /// pushing in an invalid record.
  ACE_URL_Record (void);

  /// Offer ID in the repository.
  ACE_WString *id_;

  /// Offer (and its properties).
  ACE_URL_Offer *offer_;
};

/**
 * @class ACE_URL_Local_Locator
 *
 * @brief A simple URL repository to store URL offer locally.
 *
 * This class manage a collection of URL offers
 * for local query and registration.  But we should
 * really use it within a server.
 */
class ACE_Svc_Export ACE_URL_Local_Locator
{
  /// Default destructor.
  virtual ~ACE_URL_Local_Locator (void);

  /**
   * Query the locator for HTTP with designate properties (none, some,
   * or all).  The locator being queried will return a sequence of
   * offers with <how_many> offers in it.  This interface allocates
   * <offer> so users must deallocate it after use.
   */
  virtual int url_query (const ACE_URL_Locator::ACE_Selection_Criteria how,
                         const ACE_URL_Property_Seq *pseq,
                         const size_t how_many,
                         size_t &num_query,
                         ACE_URL_Offer_Seq *offer);

  /// Export an offer to the locator.
  virtual int export_offer (ACE_URL_Offer *offer,
                            ACE_WString &offer_id);

  /// Withdraw an offer.  return 0 if succeed, -1 otherwise.
  virtual int withdraw_offer (const ACE_WString &offer_id);

  /// Query a specific offer.
  virtual int describe_offer (const ACE_WString &offer_id,
                              ACE_URL_Offer *offer);

  /// Modify a previously registered offer.
  virtual int modify_offer (const ACE_WString &offer_id,
                            const ACE_WString *url = 0,
                            const ACE_URL_Property_Seq *del = 0,
                            const ACE_URL_Property_Seq *modify = 0);

protected:
  ACE_Unbounded_Set<ACE_URL_Record> repository_;
};

#if defined (__ACE_INLINE__)
#include "Local_Locator.inl"
#endif /* __ACE_INLINE__ */

#endif /* ACE_LOCAL_LOCATOR_H */
