ObjectMap.h

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/***************************************************************************
 *
 * Copyright (C) 2009-2010 Cassio Neri Moreira
 *
 * This file is part of the KeyValue library.
 *
 * The KeyValue library 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 3 of the License, or (at
 * your option) any later version.
 *
 * The KeyValue library 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 KeyValue. If not, see <http://www.gnu.org/licenses/>.
 *
 * If you modify this library, or any covered work, by linking or combining
 * it with Excel (or a modified version of that program), containing parts
 * covered by the terms of End-User License Agreement for Microsoft
 * Software, the licensors of KeyValue grant you additional permission to
 * convey the resulting work.
 *
 **************************************************************************/

#ifndef KEYVALUE_KEY_MAP_OBJECTMAP_H_
#define KEYVALUE_KEY_MAP_OBJECTMAP_H_

#include "keyvalue/extern/String.h"
#include "keyvalue/frontend/LexicalToolKit.h"
#include "keyvalue/mngt/BuilderFrom.h"
#include "keyvalue/mngt/DataSet.h"
#include "keyvalue/mngt/ProcessorInstantiator.h"
#include "keyvalue/mngt/Repository.h"
#include "keyvalue/sys/exception/KV_ASSERT.h"
#include "keyvalue/util/Global.h"
#include "keyvalue/value/Variant.h"

namespace keyvalue {
namespace key {

template <typename ObjectType>
class ObjectMap {

public:

  typedef shared_ptr<ObjectType> OutputType_;

  shared_ptr<ObjectType>
  map(const value::Variant& variant) const;

private:

  virtual string
  getName() const = 0;

}; // class ObjectMap

/*--------------------------------------------------------------------------
 * map()
 *------------------------------------------------------------------------*/

template<typename ObjectType>
shared_ptr<ObjectType>
ObjectMap<ObjectType>::map(const value::Variant& variant) const {

  Processor& builder(ProcessorInstantiator<ObjectType>::getInstance());

  string name;

  // Try to get result from a DataSet (whose name is stored by variant)
  if (variant.is<string>(frontend::LexicalToolKit::input)) {

    name = variant.get<string>(frontend::LexicalToolKit::input);

    try {

      shared_ptr<const DataSet>
        data(util::Global<Repository>::get()->getDataSet(name));

      value::Result result(data->process(builder));

      const value::ObjectPtr object(result.getObjectPtr());
      KV_ASSERT(object, "value::Result must be non null ObjectPtr!");
      return static_pointer_cast<ObjectType>(object);
    }

    catch(Repository::NotFound& error) {
      if (error.getName() != name)
        throw;
    }
  }

  // Try to get result from variant
  BuilderFromVariant<ObjectType>*
    ptr(dynamic_cast<BuilderFromVariant<ObjectType>*>(&builder));
  if (ptr)
    return ptr->getObject(variant);

  if (!name.empty())
    throw RuntimeError() & "Object '" & name & "' not found and builder " &
      builder.getName() & "cannot build from this input!";

  throw RuntimeError() & "Builder '" & builder.getName() & "'cannot build"
    "from input " & variant & "'!";
}

} // namespace key
} // namespace keyvalue

#endif // KEYVALUE_KEY_MAP_OBJECTMAP_H_