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ファクトリー

ファクトリークラス

class DataObject
{
	public:
		const static int READ = 0;
		const static int WRITE = 1;
                const static int APPEND = 2;
		
		static DataObject* create(int type, string file);
		virtual string OpenMode(int id) = 0;
};

DataObject* DataObject::create(int type, string file)
{
	DataObject* result;
        switch(type)
        {
            case READ:
                result = new ReadFileDataObject(file);
                break;
             case WRITE:
                 result = new WriteFileDataObject(file);
                 break;
             case APPEND:
                 result = new AppendFileDataObject(file);
                 break;
        }
	return result;
}