Teuchos_TreeBuildingXMLHandler.cpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #include "Teuchos_TreeBuildingXMLHandler.hpp"
00030 #include "Teuchos_StrUtils.hpp"
00031 #include "Teuchos_TestForException.hpp"
00032 
00033 using namespace Teuchos;
00034 
00035 TreeBuildingXMLHandler::TreeBuildingXMLHandler()
00036   : root_(), current_(), path_()
00037 { 
00038   current_ = root_;
00039 }
00040 
00041 void TreeBuildingXMLHandler::characters(const std::string& chars)
00042 {
00043   TEST_FOR_EXCEPTION(current_.isEmpty(), std::logic_error,
00044                      "TreeBuildingXMLHandler::trying to add content to an empty node");
00045                         
00046   current_.addContent(StrUtils::fixUnprintableCharacters(chars));
00047 }
00048 
00049 void TreeBuildingXMLHandler::startElement(const std::string& tag, 
00050                                           const Map& attributes)
00051 {
00052   XMLObject parent;
00053   
00054   if (current_.isEmpty()) 
00055     {
00056       root_ = XMLObject("root");
00057       current_ = root_;
00058     }
00059   parent = current_;
00060   path_.push(current_);
00061   current_ = XMLObject(tag);
00062   parent.addChild(current_);
00063 
00064   for (Map::const_iterator i=attributes.begin(); i != attributes.end(); ++i)
00065     {
00066       const std::string& key = (*i).first;
00067       const std::string& val = (*i).second;
00068       current_.addAttribute(key, val);
00069     }
00070 }
00071 
00072 int TreeBuildingXMLHandler::endElement(const std::string& tag)
00073 {
00074   int error = 0;
00075   if (path_.size() > 0)
00076     {
00077       if (current_.getTag() != tag) {
00078         error = 1; // error: tags must be balanced
00079       }
00080       current_ = path_.top();
00081       path_.pop();
00082     }
00083   else 
00084     {
00085       error = 1; // error: cannot end element that wasn't started
00086     }
00087   return error;
00088 }
00089 

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