DescriptionScope.hxx

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/*
 * Copyright (c) 2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef _DescriptionScope_hxx_
#define _DescriptionScope_hxx_

#include "DescriptionAttributes.hxx"
#include <map>
#include <vector>

namespace CLAM
{
        class SchemaError : public Err
        {
                public:
                SchemaError(const std::string & msg) : Err(msg.c_str()) {}
        };

        class DescriptionScope
        {
        public:
                typedef std::map<std::string, unsigned> NamesMap;
                typedef std::vector<AbstractAttribute *> Attributes;
        private:
                NamesMap _nameMap;
                Attributes _attributes;
                std::string _scopeName;
        public:
                DescriptionScope(const std::string & name) : _scopeName(name) {}
                ~DescriptionScope();

                const std::string & GetName() const
                {
                        return _scopeName;
                }

                template <typename AttributeType>
                void Add(const std::string & name)
                {
                        unsigned attributeIndex = _nameMap.size();
                        bool inserted = 
                                _nameMap.insert(std::make_pair(name,attributeIndex)).second;
                        CLAM_ASSERT(inserted,("Couldn't add attribute '"+_scopeName+":"+name+"', already present in the scope").c_str());
                        _attributes.push_back(new Attribute<AttributeType>(_scopeName, name));
                }

                unsigned GetIndex(const std::string & name) const
                {
                        NamesMap::const_iterator it = _nameMap.find(name);
                        CLAM_ASSERT(it!=_nameMap.end(),
                                (std::string()+"Accessing an unexisting attribute '"+_scopeName+"':'"+name+"'").c_str());
                        return it->second;
                }
                unsigned GetIndexSafe(const std::string & name) const
                {
                        NamesMap::const_iterator it = _nameMap.find(name);
                        if (it==_nameMap.end())
                                throw SchemaError("Accessing an unexisting attribute '"+_scopeName+"':'"+name+"'");
                        return it->second;
                }

                unsigned GetNAttributes() const
                {
                        return _nameMap.size();
                }

                void * Allocate(unsigned attribute, unsigned size) const
                {
                        return _attributes[attribute]->Allocate(size);
                }
                void Deallocate(unsigned attribute, void * buffer) const
                {
                        _attributes[attribute]->Deallocate(buffer);
                }

                template <typename AttributeType>
                void CheckType(unsigned attributeIndex, AttributeType *) const
                {
                        _attributes[attributeIndex]->CheckType<AttributeType>();
                }

                const std::string & GetAttributeName(unsigned attributeIndex) const
                {
                        CLAM_ASSERT(attributeIndex<_attributes.size(),
                                "GetAttributeName: Using a wrong index to look up an attribute name");
                        AbstractAttribute * attribute = _attributes[attributeIndex];
                        return attribute->GetName();
                }
                const AbstractAttribute & GetAttribute(unsigned int attribute) const
                {
                        return * _attributes[attribute];
                }
        };

}


#endif// _DescriptionScope_hxx_