CRNDataFactory.cpp

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/* Copyright 2008-2016 INSA Lyon, CoReNum
 * 
 * This file is part of libcrn.
 * 
 * libcrn is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * libcrn 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with libcrn.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * file: CRNDataFactory.cpp
 * \author Yann LEYDIER
 */

#include <CRNData/CRNDataFactory.h>
#include <CRNException.h>
#include <CRNString.h>
#include <CRNIO/CRNIO.h>
#include <CRNi18n.h>

using namespace crn;

DataFactory& DataFactory::getInstance()
{
    static DataFactory fac;
    return fac;
}

UObject DataFactory::CreateData(xml::Element &el)
{
    if (!el)
    {
        throw ExceptionInvalidArgument(StringUTF8("SObject DataFactory::CreateData(xml::Element &el): ") + 
                _("Null XML element."));
    }
    const StringUTF8 typ = el.GetValue();
    if (typ.IsEmpty())
    {
        throw ExceptionRuntime(StringUTF8("SObject DataFactory::CreateData(xml::Element &el): ") + _("Cannot read element."));
    }
    return getInstance().createObject(typ, el); // may throw
}

bool DataFactory::RegisterClass(const String &name, std::unique_ptr<DataFactoryElementBase> &&cstr)
{
    if (getInstance().data.find(name) == getInstance().data.end())
    {
        getInstance().data[name] = std::move(cstr);
        return true;
    }
    else
        return false;
}

String DataFactory::GetKnownTypes()
{
    String s;
    
    for (auto & elem : getInstance().data)
    {
        s += (elem).first + U"\n";
    }
    return s;
}

DataFactory::DataFactory()
{
}

DataFactory::~DataFactory()
{
}

UObject DataFactory::createObject(const String &name, xml::Element &el)
{
    if (data.find(name) != data.end())
        return data[name]->Create(el);
    else
    {
        throw ExceptionNotFound(StringUTF8("SObject CRNDataFactory::createObject("
                    "const String &name, xml::Element &el): " + StringUTF8(_("Unknown type: "))) + 
                name.CStr() + StringUTF8("."));
    }
}