view.h

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#ifndef ROSBAG_VIEW_H
#define ROSBAG_VIEW_H
 
#include <boost/function.hpp>
#include <boost/iterator/iterator_facade.hpp>
 
#include "rosbag/message_instance.h"
#include "rosbag/query.h"
#include "rosbag/macros.h"
#include "rosbag/structures.h"
 
namespace rosbag {
 
class ROSBAG_STORAGE_DECL View
{
    friend class Bag;
 
public:
 
    class ROSBAG_STORAGE_DECL iterator : public boost::iterator_facade<iterator,
                                                   MessageInstance,
                                                   boost::forward_traversal_tag>
    {
    public:
        iterator(iterator const& i);
        iterator &operator=(iterator const& i);
        iterator();
        ~iterator();
 
    protected:
        iterator(View* view, bool end = false);
 
    private:
        friend class View;
        friend class boost::iterator_core_access;
 
                void populate();
                void populateSeek(std::multiset<IndexEntry>::const_iterator iter);
 
        bool equal(iterator const& other) const;
 
        void increment();
 
        MessageInstance& dereference() const;
 
    private:
        View* view_;
        std::vector<ViewIterHelper> iters_;
        uint32_t view_revision_;
        mutable MessageInstance* message_instance_;
    };
 
    typedef iterator const_iterator;
 
    struct TrueQuery {
        bool operator()(ConnectionInfo const*) const { return true; };
    };
 
 
    View(bool const& reduce_overlap = false);
 
 
    View(Bag const& bag, ros::Time const& start_time = ros::TIME_MIN, ros::Time const& end_time = ros::TIME_MAX, bool const& reduce_overlap = false);
 
 
    View(Bag const& bag, boost::function<bool(ConnectionInfo const*)> query,
         ros::Time const& start_time = ros::TIME_MIN, ros::Time const& end_time = ros::TIME_MAX, bool const& reduce_overlap = false);
 
    ~View();
 
    iterator begin();
    iterator end();
    uint32_t size();
 
 
    void addQuery(Bag const& bag, ros::Time const& start_time = ros::TIME_MIN, ros::Time const& end_time = ros::TIME_MAX);
 
 
    void addQuery(Bag const& bag, boost::function<bool(ConnectionInfo const*)> query,
                      ros::Time const& start_time = ros::TIME_MIN, ros::Time const& end_time = ros::TIME_MAX);
 
    std::vector<const ConnectionInfo*> getConnections();
 
    ros::Time getBeginTime();
    ros::Time getEndTime();
  
protected:
    friend class iterator;
 
    void updateQueries(BagQuery* q);
    void update();
 
    MessageInstance* newMessageInstance(ConnectionInfo const* connection_info, IndexEntry const& index, Bag const& bag);
 
private:
    View(View const& view);
    View& operator=(View const& view);
 
protected:
    std::vector<MessageRange*> ranges_;
    std::vector<BagQuery*>     queries_;
    uint32_t                   view_revision_;
 
    uint32_t size_cache_;
    uint32_t size_revision_;
 
    bool reduce_overlap_;
};
 
} // namespace rosbag
 
#endif