source: gsdl/trunk/lib/dbclass.cpp@ 15652

/**********************************************************************
 *
 * dbclass.cpp -- 
 * Copyright (C) 1999-2008  The New Zealand Digital Library Project
 *
 * A component of the Greenstone digital library software
 * from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *********************************************************************/

#include "dbclass.h"
#include "OIDtools.h"


dbclass::~dbclass() {}


// May be overwritten by subclasses; returns true if exists
bool dbclass::exists (const text_t& key)
{
  text_t data;
  return getkeydata (key, data);
}


// replaces the .fc, .lc, .pr, .rt, .ns and .ps syntax (first child, 
// last child, parent, root, next sibling, previous sibling) 
// it expects child, parent, etc. to exist if syntax has been used
// so you should test before using
text_t dbclass::translate_OID (const text_t &inOID, infodbclass &info)
{
  if (inOID.size() < 4) return inOID;
  if (findchar (inOID.begin(), inOID.end(), '.') == inOID.end()) return inOID;

  text_t OID = inOID;
  text_tarray tailarray;
  text_t tail = substr (OID.end()-3, OID.end());
  if (tail == ".rt") {
    get_top (inOID, OID);
    return OID;
  }
  while (tail == ".fc" || tail == ".lc" || tail == ".pr" || 
     tail == ".ns" || tail == ".ps") {
    tailarray.push_back(tail);
    OID.erase (OID.end()-3, OID.end());
    tail = substr (OID.end()-3, OID.end());
    if (tail == ".rt") {
      get_top (inOID, OID);
      return OID;
    }
  }

  if (tailarray.empty()) return inOID;
  text_tarray::const_iterator begin = tailarray.begin();
  text_tarray::const_iterator here = tailarray.end() - 1;

  while (here >= begin) {

    if (*here == ".fc")
      get_first_child (OID, info);
    else if (*here == ".lc")
      get_last_child (OID, info);
    else if (*here == ".pr")
      OID = get_parent (OID);
    else if (*here == ".ns")
      get_next_sibling (OID, info);
    else if (*here == ".ps")
      get_previous_sibling (OID, info);
    
    if (here == begin)
      break;
    --here;
  }

  return OID;
}


void dbclass::get_first_child (text_t &OID, infodbclass &info)
{
  text_t firstchild;
  if (getinfo (OID, info)) {
    text_t &contains = info["contains"];
    if (!contains.empty()) {
      text_t parent = OID;
      getdelimitstr (contains.begin(), contains.end(), ';', firstchild);
      if (firstchild.empty()) OID = contains;
      else OID = firstchild;
      if (*(OID.begin()) == '"') translate_parent (OID, parent);
    }
  }
}


void dbclass::get_last_child (text_t &OID, infodbclass &info)
{
  text_tarray children;
  if (getinfo (OID, info)) {
    text_t &contains = info["contains"];
    if (!contains.empty()) {
      text_t parent = OID;
      splitchar (contains.begin(), contains.end(), ';', children);
      OID = children.back();
      if (*(OID.begin()) == '"') translate_parent (OID, parent);
    }
  }
}

  
void dbclass::get_next_sibling (text_t &OID, infodbclass &info)
{
  text_tarray siblings;
  text_t parent = get_parent (OID);
         
  if (getinfo (parent, info)) {
    text_t &contains = info["contains"];
    if (!contains.empty()) {
      splitchar (contains.begin(), contains.end(), ';', siblings);
      text_tarray::const_iterator here = siblings.begin();
      text_tarray::const_iterator end = siblings.end();
      text_t shrunk_OID = OID;
      shrink_parent (shrunk_OID);
      while (here != end) {
    if (*here == shrunk_OID && (here+1 != end)) {
      OID = *(here+1);
      if (*(OID.begin()) == '"') translate_parent (OID, parent);
      break;
    }
    ++here;
      }
    }
  }
}


void dbclass::get_previous_sibling (text_t &OID, infodbclass &info)
{
  text_tarray siblings;
  text_t parent = get_parent (OID);

  if (getinfo (parent, info)) {
    text_t &contains = info["contains"];
    if (!contains.empty()) {
      splitchar (contains.begin(), contains.end(), ';', siblings);
      text_tarray::const_iterator here = siblings.begin();
      text_tarray::const_iterator end = siblings.end();
      text_t shrunk_OID = OID;
      shrink_parent (shrunk_OID);
      while (here != end) {
    if (*here == shrunk_OID && (here != siblings.begin())) {
      OID = *(here-1);
      if (*(OID.begin()) == '"') translate_parent (OID, parent);
      break;
    }
    ++here;
      }
    }
  }
}