source: trunk/gsdl/src/recpt/OIDtools.cpp@ 278

/**********************************************************************
 *
 * OIDtools.cpp -- 
 * Copyright (C) 1999  The New Zealand Digital Library Project
 *
 * PUT COPYRIGHT NOTICE HERE
 *
 * $Id: OIDtools.cpp 278 1999-06-16 03:11:25Z sjboddie $
 *
 *********************************************************************/

/*
   $Log$
   Revision 1.8  1999/06/16 03:11:25  sjboddie
   get_info() now takes a getParents argument

   Revision 1.7  1999/06/16 02:05:23  sjboddie
   just changed a comment that was confusing me

   Revision 1.6  1999/05/10 03:40:25  sjboddie
   lots of changes - slowly getting document action sorted out

   Revision 1.5  1999/04/30 01:59:37  sjboddie
   lots of stuff - getting documentaction working (documentaction replaces
   old browseaction)

   Revision 1.4  1999/03/29 02:14:25  sjboddie

   More changes to browseaction

   Revision 1.3  1999/03/25 03:13:42  sjboddie

   More library functions for dealing with OIDs. Many of them just
   return dummy data at present

   Revision 1.2  1999/03/05 03:53:53  sjboddie

   fixed some bugs

   Revision 1.1  1999/03/04 22:38:20  sjboddie

   Added subjectbrowseaction. - Doesn't do anything yet.

 */

#include "OIDtools.h"


// returns (in top) the top level of OID (i.e. everything
// up until the first dot)
void get_top (const text_t &OID, text_t &top) {

  top.clear();
  if (OID.empty()) return;

  text_t::const_iterator begin = OID.begin();
  text_t::const_iterator end = OID.end();

  top.appendrange (begin, findchar(begin, end, '.'));
}   


// checks if OID is top level (i.e. contains no dots)
bool is_top (const text_t &OID) {

  if (OID.empty()) return true;

  text_t::const_iterator here = OID.begin();
  text_t::const_iterator end = OID.end();
  here = findchar (here, end, '.');

  if (here == end) return true;
  return false;
}


// get_parents_array loads the parents array with all the parents of the
// document or classification specified by OID (not including OID itself)
void get_parents_array (const text_t &OID, text_tarray &parents) {

  parents.erase (parents.begin(), parents.end());

  text_t::const_iterator here = OID.begin ();
  text_t::const_iterator end = OID.end ();
  text_t thisparent;

  while (here != end) {
    if (*here == '.') parents.push_back(thisparent);
    thisparent.push_back(*here);
    here ++;
  }
}


// get_info does a protocol call and returns (in response) the metadata 
// associated with OID. The metadata array should be loaded with whatever
// metadata fields are to be requested.

bool get_info (const text_t &OID, const text_t &collection,
           const text_tarray &metadata, bool getParents,
           recptproto *collectproto,FilterResponse_t &response, 
           ostream &logout) {

  response.clear();

  comerror_t err;
  FilterRequest_t request;

  request.filterName = "NullFilter";
  request.filterResultOptions = FRmetadata;
  request.getParents = getParents;
  request.fields = metadata;
  request.docSet.insert (OID);
  
  collectproto->filter (collection, request, response, err, logout);
  if (err != noError) {
    outconvertclass text_t2ascii;
    logout << text_t2ascii
       << "Error: call to filter failed for " << OID
       << " in OIDtools::get_info (" 
       << get_comerror_string (err) << ")\n";
    return false;
  }
  return true;
}

// has_children returns true if OID has children
bool has_children (const text_t &OID, const text_t &collection, 
           recptproto *collectproto, ostream &logout) {

  FilterResponse_t response;
  text_tarray metadata;
  metadata.push_back ("haschildren");

  if (get_info (OID, collection, metadata, false, collectproto, response, logout)) {
    if (response.docInfo[0].metadata[0].values[0] == "1")
      return true;
  }
  return false;
}


// get_children does a protocol call and returns (in response) the OIDs and 
// metadata of all the children of OID. The metadata array should be loaded
// with whatever metadata fields are to be requested.

bool get_children (const text_t &OID, const text_t &collection, 
           const text_tarray &metadata, recptproto *collectproto, 
           FilterResponse_t &response, ostream &logout) {
  
  response.clear();

  comerror_t err;
  FilterRequest_t request;
  OptionValue_t option;

  option.name = "ParentNode";
  option.value = OID;
  request.filterOptions.push_back (option);
  request.filterName = "BrowseFilter";
  request.filterResultOptions = FROID | FRmetadata;
  request.fields = metadata;

  collectproto->filter (collection, request, response, err, logout);

  if (err != noError) {
    outconvertclass text_t2ascii;
    logout << text_t2ascii
       << "Error: call to filter failed for " << OID 
       << " in OIDtools::get_children (" 
       << get_comerror_string (err) << ")\n";
    return false;
  }
  return true;
}

// get_parent returns the parent of the document or classification
// specified by OID
text_t get_parent (text_t OID) {

  if (OID.empty() || is_top (OID)) return "";

  text_t::const_iterator begin = OID.begin();
  text_t::const_iterator here = (OID.end() - 1);

  while (here >= begin) {
    OID.pop_back();
    if (*here == '.') break;
    here --;
  }
  return OID;
}

// takes an OID like ".2 and replaces the " with parent
void translate_parent (text_t &OID, const text_t &parent) {

  text_t::const_iterator here = OID.begin();
  text_t::const_iterator end = OID.end();
  text_t temp;

  while (here != end) {
    if (*here == '"') temp += parent;
    else temp.push_back (*here);
    here ++;
  }
  OID = temp;
}

// shrink_parent does the opposite to translate_parent
void shrink_parent (text_t &OID) {
  
  text_tarray tmp;
  splitchar (OID.begin(), OID.end(), '.', tmp);
  OID = "\"." + tmp.back();
}

// checks if OID uses ".fc", ".lc", ".pr", ".ns",
// or ".ps" syntax (first child, last child, parent,
// next sibling, previous sibling)
bool needs_translating (const text_t &OID) {

  if (OID.size() < 4) return false;

  text_t tail = substr (OID.end()-3, OID.end());
  if (tail == ".fc" || tail == ".lc" || tail == ".pr" || 
      tail == ".ns" || tail == ".ps") return true;

  return false;
}


void recurse_contents (const ResultDocInfo_t section, const bool &classify, 
               int &totalcols, const text_t &collection, 
               const text_tarray &metadata, recptproto *collectproto, 
               FilterResponse_t &response, ostream &logout) {
  
  int haschildren = section.metadata[1].values[0].getint();
  const text_t &doctype = section.metadata[2].values[0];
  int cols;

  if ((haschildren == 1) && ((!classify) || (doctype == "classify"))) {
    text_t parent = response.docInfo.back().OID;
    int parentcols = countchar (parent.begin(), parent.end(), '.');
    FilterResponse_t tmp;
    get_children (section.OID, collection, metadata, collectproto, tmp, logout);
    ResultDocInfo_tarray::const_iterator thisdoc = tmp.docInfo.begin();
    ResultDocInfo_tarray::const_iterator lastdoc = tmp.docInfo.end();
    while (thisdoc != lastdoc) {
      if (((*thisdoc).metadata[2].values[0] != "classify") && (classify))
    cols = parentcols + 1;
      else 
    cols = countchar ((*thisdoc).OID.begin(), (*thisdoc).OID.end(), '.');
      if (cols > totalcols) totalcols = cols;
      response.docInfo.push_back (*thisdoc);
      recurse_contents (*thisdoc, classify, totalcols, collection, 
            metadata, collectproto, response, logout);
      thisdoc ++;
    }
  }
}

// get_contents returns OIDs and metadata of all contents 
// below (and including) OID.
// metadata being returned for each is Title, haschildren, 
// doctype, and hastxt
void get_contents (const text_t &topOID, const text_t &classifytype, int &totalcols,
           const text_t &collection, recptproto *collectproto, 
           FilterResponse_t &response, ostream &logout) {

  bool classify = false;
  response.clear();
  text_tarray metadata;
  metadata.push_back ("Title");
  metadata.push_back ("haschildren");
  metadata.push_back ("doctype");
  metadata.push_back ("hastxt");

  // we don't want to recurse all the way down through each document
  // if we're expanding top level contents
  if (classifytype == "classify") classify = true;

  // update totalcols
  totalcols = countchar (topOID.begin(), topOID.end(), '.');

  // get topOIDs info
  if (get_info (topOID, collection, metadata, false, collectproto, response, logout))
      recurse_contents (response.docInfo[0], classify, totalcols, collection, 
            metadata, collectproto, response, logout);
}