object_predicates.hpp

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//
// (c) Copyright 2014 DESY, Eugen Wintersberger <eugen.wintersberger@desy.de>
//
// This file is part of libpniio.
//
// libpniio 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.
//
// libpniio 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 libpniio.  If not, see <http://www.gnu.org/licenses/>.
// ===========================================================================
// Created on: Sep 12, 2014
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
#pragma once

#include "../nxobject.hpp"
#include "iterators.hpp"
#include "is_field.hpp"
#include "get_name.hpp"
#include "is_class.hpp"
#include "as_group.hpp"

namespace pni{
namespace io{
namespace nx{
    
    template<typename OTYPE> 
    OTYPE get_object_by_name(const OTYPE &parent,const pni::core::string &name)
    {
        using namespace pni::core;

        auto group = as_group(parent);
        
        if(!group.has_child(name))
            throw key_error(EXCEPTION_RECORD,
                "Group has no child ["+name+"]!");
        
        return group[name];
    }
    
    //-------------------------------------------------------------------------
    template<typename OTYPE>
    OTYPE get_object_by_name_and_class(const OTYPE &parent,
                                       const pni::core::string &name,
                                       const pni::core::string &c)
    {
        using namespace pni::core;
        auto result = get_object_by_name(parent,name);
        
        if(is_field(result))
            throw type_error(EXCEPTION_RECORD,
                "Object is a field and thus does not have a class!");
        
        if(!is_class(result,c))
            throw key_error(EXCEPTION_RECORD,
                "No object ["+name+":"+c+"] found!");
                
        return result;        
    }
    
    //-------------------------------------------------------------------------
    template<typename OTYPE>
    OTYPE get_object_by_class(const OTYPE &parent,pni::core::string c)
    {
        using namespace pni::core;

        auto iter = std::find_if(begin(parent),end(parent),
                    [&c](const OTYPE &o) { 
                        if(is_field(o)) return false;
                        
                        return is_class(o,c);
                    });
                    
        if(iter == end(parent))
            throw key_error(EXCEPTION_RECORD,
                "No group of class ["+c+"] found!");
                
        return *iter;
    }


//end of namespace
}
}
}