LengthEvent.hh

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// (C) 199x-2009 University of California Santa Cruz
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// (C) 199x-2009 Johns Hopkins University
// (C) 199x-2009 University of North Carolina, Chapel Hill
// (C) 199x-2009 Vanderbilt University

/// @file   core/conformation/signals/LengthEvent.hh
/// @brief  signal for a change in length of residues in a Conformation
/// @author Yih-En Andrew Ban (yab@u.washington.edu)

#ifndef INCLUDED_core_conformation_signals_LengthEvent_hh
#define INCLUDED_core_conformation_signals_LengthEvent_hh

// type headers
#include <core/types.hh>

// unit headers
#include <core/conformation/signals/LengthEvent.fwd.hh>

// package headers
#include <core/conformation/Residue.fwd.hh>
#include <core/conformation/signals/GeneralEvent.hh>

// utility headers
#include <utility/pointer/access_ptr.hh>


namespace core {
namespace conformation {
namespace signals {


/// @brief signals a change in length of residues in a Conformation
/// @remarks When accessing residue information, take care as to which
///  data member you choose.  For almost all situations the ResidueCAP
///  'residue' should be used instead of the Conformation.  See remarks
///  below.
struct LengthEvent : public GeneralEvent {


  // typedefs
  typedef core::Size Size;
  typedef GeneralEvent Super;


  /// @brief the type of length change
  enum Tag {
    EMPTY, // empty event, e.g. for default constructor
    INVALIDATE, // for safety, e.g. if during copy assignment something radical occurs
    RESIDUE_APPEND,
    RESIDUE_PREPEND,
    RESIDUE_DELETE
  };


  /// @brief default constructor
  inline
  LengthEvent() :
    Super(),
    tag( EMPTY ),
    position( 0 ),
    length_change( 0 ),
    residue()
  {}


  /// @brief constructor
  /// @param t type of length change
  /// @param pos residue position
  inline
  LengthEvent(
    Conformation const * conf,
    Tag const t,
    Size const & pos,
    int const & len_chg,
    Residue const * res
  ) :
    Super( conf ),
    tag( t ),
    position( pos ),
    length_change( len_chg ),
    residue( res )
  {}


  /// @brief copy constructor
  inline
  LengthEvent( LengthEvent const & rval ) :
    Super( rval ),
    tag( rval.tag ),
    position( rval.position ),
    length_change( rval.length_change ),
    residue( rval.residue )
  {}


  /// @brief default destructor
  inline
  virtual
  ~LengthEvent() {}


  /// @brief copy assignment
  inline
  LengthEvent &
  operator =( LengthEvent const & rval ) {
    if ( this != &rval ) {
      Super::operator =( rval );
      tag = rval.tag;
      position = rval.position;
      length_change = rval.length_change;
      residue = rval.residue;
    }
    return *this;
  }


  /// @brief tag indicating type of length change
  Tag tag;

  /// @brief residue position where the event happened
  Size position;

  /// @brief overall length change of the conformation
  int length_change;

  /// @brief direct access to residue
  /// @remarks Almost always want to use this to access the residue instead of
  ///  the conformation.  Calling Conformation::residue() can cause an internal
  ///  update/re-sync inside Pose, which may have consequences if you're depending
  ///  upon multiple residue operations to be setup (such as bond angle/length
  ///  changes) prior to an internal update.
  ResidueCAP residue;


};


} // namespace signals
} // namespace conformation
} // namespace core


#endif /* INCLUDED_core_conformation_signals_LengthEvent_HH */