/*
The software in this package is distributed under the GNU General
Public License version 2 (with a special exception described below).

A copy of GNU General Public License (GPL) is included in this distribution,
in the file COPYING.GPL.

As a special exception, if other files instantiate templates or use macros
or inline functions from this file, or you compile this file and link it
with other works to produce a work based on this file, this file
does not by itself cause the resulting work to be covered
by the GNU General Public License.

However the source code for this file must still be made available
in accordance with section (3) of the GNU General Public License.

This exception does not invalidate any other reasons why a work based
on this file might be covered by the GNU General Public License.
*/
/***************************************************************************
                   xmlcommon.cpp - Common XML functions
                             -------------------
    begin                : Tue Apr 27 2004
    copyright            : (C) 2004 by Intra2net AG
 ***************************************************************************/

#include <xmlcommon.hpp>
#include <exception.hxx>
#include <sstream>
#include <vector>

using namespace xmlpp;
using namespace std;

namespace I2n {

void xml_validate_dtd(Node *root, const std::string &subsetname, const std::string &dtdname)
{
    // Create empty document, set DTD
    Document doc;
    doc.set_internal_subset(subsetname, "", dtdname);
    Element *newRoot = doc.create_root_node(root->get_name(), "", "");
    
    // Import nodes
    Node::NodeList list = root->get_children();
    Node::NodeList::iterator list_end = list.end();
    for(xmlpp::Node::NodeList::iterator iter = list.begin(); iter != list_end; ++iter)
        newRoot->import_node(*iter);

    // Parse XML again to validate it
    DomParser parser;
    parser.set_validate();
    parser.parse_memory(doc.write_to_string_formatted());
}

std::string xml_get_child_content(xmlpp::Node *base, const std::string &elementname)
{
    vector<xmlpp::Node*> nodes;

    // Read in value
    nodes = base->find(elementname);

    if (nodes.size() != 1)
    {
        ostringstream os;
        os << "xml parse error at line " << base->get_line() << ": element ambiguous or not found: " << elementname;
        throw EXCEPTION(runtime_error_src,os.str());
    }

    return xml_get_text_content(nodes[0], elementname);
}

std::string xml_get_text_content(xmlpp::Node *node, const std::string &elementname)
{
    if (node->get_children().size() <= 0)
    {
        ostringstream os;
        os << "xml parse error at line " << node->get_line() << ": element content not found in " << elementname;
        throw EXCEPTION(runtime_error_src,os.str());
    }

    xmlpp::Node::NodeList childs = node->get_children();
    xmlpp::Node::NodeList::iterator text = childs.begin();
    const xmlpp::ContentNode *nodeText=dynamic_cast<const xmlpp::ContentNode*>(*text);

    if (nodeText)
        return nodeText->get_content();
    else
    {
        ostringstream os;
        os << "xml parse error at line " << (*text)->get_line() << ": element " << elementname << " does not contain content";
        throw EXCEPTION(runtime_error_src,os.str());
    }

    // not reached
    return "";
}

}