ResStatus.h

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#ifndef ZYPP_RESSTATUS_H
#define ZYPP_RESSTATUS_H

#include <iosfwd>

#include "zypp/Bit.h"

namespace zypp
{ 

  //
  //    CLASS NAME : ResStatus
  //
  class ResStatus
  {
    friend std::ostream & operator<<( std::ostream & str, const ResStatus & obj );
    friend bool operator==( const ResStatus & lhs, const ResStatus & rhs );

  public:
    typedef uint16_t FieldType;
    typedef bit::BitField<FieldType> BitFieldType;
    // Bit Ranges within FieldType defined by 1st bit and size:
    typedef bit::Range<FieldType,0,                        1> StateField;
    typedef bit::Range<FieldType,StateField::end,          2> EstablishField;
    typedef bit::Range<FieldType,EstablishField::end,      2> TransactField;
    typedef bit::Range<FieldType,TransactField::end,       2> TransactByField;
    typedef bit::Range<FieldType,TransactByField::end,     3> TransactDetailField;
    typedef bit::Range<FieldType,TransactDetailField::end, 2> SolverStateField;
    typedef bit::Range<FieldType,SolverStateField::end,    1> LicenceConfirmedField;
    // enlarge FieldType if more bit's needed. It's not yet
    // checked by the compiler.
  public:

    enum StateValue
      {
        UNINSTALLED = bit::RangeValue<StateField,0>::value,
        INSTALLED   = bit::RangeValue<StateField,1>::value
      };
    enum EstablishValue
      {
        UNDETERMINED = bit::RangeValue<EstablishField,0>::value,
        UNNEEDED     = bit::RangeValue<EstablishField,1>::value, // has freshens, none trigger
        SATISFIED    = bit::RangeValue<EstablishField,2>::value, // has none or triggered freshens, all requirements fulfilled
        INCOMPLETE   = bit::RangeValue<EstablishField,3>::value  // installed: has none or triggered freshens, requirements unfulfilled
      };
    enum TransactValue
      {
        KEEP_STATE = bit::RangeValue<TransactField,0>::value,
        LOCKED     = bit::RangeValue<TransactField,1>::value, // locked, must not transact
        TRANSACT   = bit::RangeValue<TransactField,2>::value  // transact according to state
      };
    enum TransactByValue
      {
        SOLVER    = bit::RangeValue<TransactByField,0>::value,
        APPL_LOW  = bit::RangeValue<TransactByField,1>::value,
        APPL_HIGH = bit::RangeValue<TransactByField,2>::value,
        USER      = bit::RangeValue<TransactByField,3>::value
      };

    enum DetailValue
      {
        NO_DETAIL = bit::RangeValue<TransactDetailField,0>::value,
      };

    enum InstallDetailValue
      {
        EXPLICIT_INSTALL = bit::RangeValue<TransactDetailField,0>::value,
        SOFT_INSTALL     = bit::RangeValue<TransactDetailField,1>::value
      };
    enum RemoveDetailValue
      {
        EXPLICIT_REMOVE = bit::RangeValue<TransactDetailField,0>::value,
        SOFT_REMOVE     = bit::RangeValue<TransactDetailField,1>::value,
        DUE_TO_OBSOLETE = bit::RangeValue<TransactDetailField,2>::value,
        DUE_TO_UNLINK   = bit::RangeValue<TransactDetailField,3>::value,
        DUE_TO_UPGRADE  = bit::RangeValue<TransactDetailField,4>::value
      };
    enum SolverStateValue
      {
        NORMAL     = bit::RangeValue<SolverStateField,0>::value, // default, notthing special
        SEEN       = bit::RangeValue<SolverStateField,1>::value, // already seen during ResolverUpgrade
        IMPOSSIBLE = bit::RangeValue<SolverStateField,2>::value  // impossible to install
      };

    enum LicenceConfirmedValue
      {
        LICENCE_UNCONFIRMED = bit::RangeValue<LicenceConfirmedField,0>::value,
        LICENCE_CONFIRMED   = bit::RangeValue<LicenceConfirmedField,1>::value
      };

  public:

    ResStatus();

    ResStatus( bool isInstalled_r );

    ~ResStatus();

    BitFieldType bitfield() const
    { return _bitfield; }

  public:

    bool isLicenceConfirmed() const
    { return fieldValueIs<LicenceConfirmedField>( LICENCE_CONFIRMED ); }

    void setLicenceConfirmed( bool toVal_r = true )
    { fieldValueAssign<LicenceConfirmedField>( toVal_r ? LICENCE_CONFIRMED : LICENCE_UNCONFIRMED ); }

  public:
    // These two are IMMUTABLE!

    bool isInstalled() const
    { return fieldValueIs<StateField>( INSTALLED ); }

    bool isUninstalled() const
    { return fieldValueIs<StateField>( UNINSTALLED ); }

  public:

    bool staysInstalled() const
    { return isInstalled() && !transacts(); }

    bool wasInstalled() const { return staysInstalled(); }      //for old status

    bool isToBeInstalled() const
    { return isUninstalled() && transacts(); }

    bool staysUninstalled() const
    { return isUninstalled() && !transacts(); }

    bool wasUninstalled() const { return staysUninstalled(); }  // for old status

    bool isToBeUninstalled() const
    { return isInstalled() && transacts(); }

    bool isUndetermined() const
    { return fieldValueIs<EstablishField>( UNDETERMINED ); }

    bool isEstablishedUneeded() const
    { return fieldValueIs<EstablishField>( UNNEEDED ); }

    bool isEstablishedSatisfied() const
    { return fieldValueIs<EstablishField>( SATISFIED ); }

    bool isEstablishedIncomplete() const
    { return fieldValueIs<EstablishField>( INCOMPLETE ); }

    bool isUnneeded() const
    { return isUninstalled() && fieldValueIs<EstablishField>( UNNEEDED ); }

    bool isSatisfied() const
    { return isUninstalled() && fieldValueIs<EstablishField>( SATISFIED ); }

    bool isComplete () const
    { return isInstalled() && fieldValueIs<EstablishField>( SATISFIED ); }

    bool isIncomplete() const
    { return isInstalled() && fieldValueIs<EstablishField>( INCOMPLETE ); }

    bool isNeeded() const
    { return isUninstalled() && fieldValueIs<EstablishField>( INCOMPLETE ); }

    bool isLocked() const
    { return fieldValueIs<TransactField>( LOCKED ); }

    bool isKept() const
    { return fieldValueIs<TransactField>( KEEP_STATE ); }      

    bool transacts() const
    { return fieldValueIs<TransactField>( TRANSACT ); }

    TransactValue getTransactValue() const
    { return (TransactValue)_bitfield.value<TransactField>(); }

    bool isBySolver() const
    { return fieldValueIs<TransactByField>( SOLVER ); }

    bool isByApplLow() const
    { return fieldValueIs<TransactByField>( APPL_LOW ); }

    bool isByApplHigh() const
    { return fieldValueIs<TransactByField>( APPL_HIGH ); }

    bool isByUser() const
    { return fieldValueIs<TransactByField>( USER ); }

    TransactByValue getTransactByValue() const
    { return (TransactByValue)_bitfield.value<TransactByField>(); }

      
    bool isToBeUninstalledDueToObsolete () const
    { return isToBeUninstalled() && fieldValueIs<TransactDetailField>( DUE_TO_OBSOLETE ); }

    bool isToBeUninstalledDueToUnlink() const
    { return isToBeUninstalled() && fieldValueIs<TransactDetailField>( DUE_TO_UNLINK ); }

    bool isToBeUninstalledDueToUpgrade() const
    { return isToBeUninstalled() && fieldValueIs<TransactDetailField>( DUE_TO_UPGRADE ); }

    bool isToBeInstalledSoft () const
    { return isToBeInstalled() && fieldValueIs<TransactDetailField>( SOFT_INSTALL ); }

    bool isToBeInstalledNotSoft () const
    { return isToBeInstalled() && !fieldValueIs<TransactDetailField>( SOFT_INSTALL ); }

    bool isToBeUninstalledSoft () const
    { return isToBeUninstalled() && fieldValueIs<TransactDetailField>( SOFT_REMOVE ); }

  public:

    //------------------------------------------------------------------------
    // get/set functions, returnig \c true if requested status change
    // was successfull (i.e. leading to the desired transaction).
    // If a lower level (e.g.SOLVER) wants to transact, but it's
    // already set by a higher level, \c true should be returned.
    // Removing a higher levels transaction bit should fail.
    //
    // The may functions checks only, if the action would return true
    // if it is called.

    bool setTransactValue( TransactValue newVal_r, TransactByValue causer_r )
    {
      switch ( newVal_r )
        {
        case KEEP_STATE:
          return setTransact( false, causer_r );
          break;
        case LOCKED:
          return setLock( true, causer_r );
          break;
        case TRANSACT:
          return setTransact( true, causer_r );
          break;
        }
      return false;
    }

    bool maySetTransactValue( TransactValue newVal_r, TransactByValue causer_r )
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setTransactValue( newVal_r, causer_r );
        _bitfield = savBitfield;
        return ret;
    }

    bool setLock( bool toLock_r, TransactByValue causer_r )
    {
      if ( toLock_r == isLocked() )
        {
          // we're already in the desired state, but in case of
          // LOCKED, remember a superior causer.
          if ( isLocked() && isLessThan<TransactByField>( causer_r ) )
            fieldValueAssign<TransactByField>( causer_r );
           return true;
        }
      // Here: Lock status is to be changed:
      if ( causer_r != USER )
        return false;
      // Setting no transact removes an existing lock,
      // or brings this into KEEP_STATE, and we apply the lock.
      if ( ! setTransact( false, causer_r ) )
        return false;
      if ( toLock_r ) {
          fieldValueAssign<TransactField>( LOCKED );
          fieldValueAssign<TransactByField>( causer_r );
      } else {
          fieldValueAssign<TransactField>( KEEP_STATE );
          fieldValueAssign<TransactByField>( SOLVER ); // reset to lowest causer
                                                       // in order to distinguish from keep_state_by_user
      }
      return true;
    }

    bool maySetLock( bool to_r, TransactByValue causer_r )
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setLock( to_r, causer_r );
        _bitfield = savBitfield;
        return ret;
    }

    bool setTransact( bool toTansact_r, TransactByValue causer_r )
    {
      if ( toTansact_r == transacts() )
        {
          // we're already in the desired state, but in case of
          // TRANSACT, remember a superior causer.
          if ( transacts() && isLessThan<TransactByField>( causer_r ) )
            {
              fieldValueAssign<TransactByField>( causer_r );
              // ??? adapt TransactDetailField ?
            }
          return true;
        }
      // Here: transact status is to be changed:
      if (    ! fieldValueIs<TransactField>( KEEP_STATE )
           && isGreaterThan<TransactByField>( causer_r ) )
        return false;

      if ( toTansact_r )
        {
          fieldValueAssign<TransactField>( TRANSACT );
          // ??? adapt TransactDetailField ?
        }
      else
        {
          fieldValueAssign<TransactField>( KEEP_STATE );
          fieldValueAssign<TransactDetailField>( NO_DETAIL );
        }
      fieldValueAssign<TransactByField>( causer_r );
      return true;
    }

    bool maySetTransact( bool val_r, TransactByValue causer )
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setTransact (val_r, causer);
        _bitfield = savBitfield;
        return ret;
    }

    bool setSoftLock( TransactByValue causer_r )
    {
      if ( ! setTransact( false, causer_r ) )
        return false;
      if ( fieldValueIs<TransactField>( KEEP_STATE )
           && isLessThan<TransactByField>( causer_r ) )
        fieldValueAssign<TransactByField>( causer_r );
      return true;
    }

    bool resetTransact( TransactByValue causer_r )
    {
      if ( ! setTransact( false, causer_r ) )
        return false;
      if ( fieldValueIs<TransactField>( KEEP_STATE ) )
        fieldValueAssign<TransactByField>( SOLVER );
      return true;
    }

    bool setSoftTransact( bool toTansact_r, TransactByValue causer_r,
                          TransactByValue causerLimit_r )
    {
      if ( fieldValueIs<TransactField>( KEEP_STATE )
           && toTansact_r != transacts()
           && isGreaterThan<TransactByField>( causerLimit_r ) )
        {
          // any transact status change requires a superior causer.
          return false;
        }
      return setTransact( toTansact_r, causer_r );
    }

    bool setSoftTransact( bool toTansact_r, TransactByValue causer_r )
    { return setSoftTransact( toTansact_r, causer_r, causer_r ); }

    bool maySetSoftTransact( bool val_r, TransactByValue causer,
                             TransactByValue causerLimit_r )
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setSoftTransact( val_r, causer, causerLimit_r );
        _bitfield = savBitfield;
        return ret;
    }

    bool maySetSoftTransact( bool val_r, TransactByValue causer )
    { return maySetSoftTransact( val_r, causer, causer ); }

    bool setToBeInstalled (TransactByValue causer)
    {
      if (isInstalled()) return false;
      return setTransact (true, causer);
    }

    bool maySetToBeInstalled (TransactByValue causer)
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setToBeInstalled (causer);
        _bitfield = savBitfield;
        return ret;
    }

    bool setToBeUninstalled (TransactByValue causer)
    {
      if (!isInstalled()) return false;
      return setTransact (true, causer);
    }

    bool maySetToBeUninstalled (TransactByValue causer)
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setToBeUninstalled (causer);
        _bitfield = savBitfield;
        return ret;
    }

    //------------------------------------------------------------------------
    // *** These are only for the Resolver ***

    EstablishValue getEstablishValue() const
    { return (EstablishValue)_bitfield.value<EstablishField>(); }
      
    bool setEstablishValue(const EstablishValue &establish) {
        fieldValueAssign<EstablishField>(establish);
        return true;
    }

    bool setToBeUninstalledDueToUnlink ( )
    {
      if (!setToBeUninstalled (SOLVER)) return false;
      fieldValueAssign<TransactDetailField>(DUE_TO_UNLINK);
      return true;
    }

    bool setToBeUninstalledDueToObsolete ( )
    {
      if (!setToBeUninstalled (SOLVER)) return false;
      fieldValueAssign<TransactDetailField>(DUE_TO_OBSOLETE);
      return true;
    }

    bool setToBeUninstalledDueToUpgrade ( TransactByValue causer )
    {
      if (!setToBeUninstalled (causer)) return false;
      fieldValueAssign<TransactDetailField>(DUE_TO_UPGRADE);
      return true;
    }

    bool setToBeInstalledSoft ( )
    {
      if (isInstalled()
          || !setSoftTransact (true, SOLVER))
          return false;

      fieldValueAssign<TransactDetailField>(SOFT_INSTALL);
      return true;
    }

    bool setToBeUninstalledSoft ( )
    {
      if (!isInstalled()
          || !setSoftTransact (true, SOLVER))
          return false;

      fieldValueAssign<TransactDetailField>(SOFT_REMOVE);
      return true;
    }

    bool maySetToBeUninstalledSoft ()
    {
        bit::BitField<FieldType> savBitfield = _bitfield;
        bool ret = setToBeUninstalledSoft ();
        _bitfield = savBitfield;
        return ret;
    }      

    bool isSoftInstall () {
        return fieldValueIs<TransactDetailField> (SOFT_INSTALL);
    }

    bool isSoftUninstall () {
        return fieldValueIs<TransactDetailField> (SOFT_REMOVE);
    }

    bool setSoftInstall (bool flag) {
        fieldValueAssign<TransactDetailField>(flag?SOFT_INSTALL:0);
        return true;
    }

    bool setSoftUninstall (bool flag) {
        fieldValueAssign<TransactDetailField>(flag?SOFT_REMOVE:0);
        return true;
    }

    bool setUndetermined ()
    {
      fieldValueAssign<EstablishField>(UNDETERMINED);
      return true;
    }

    bool setUnneeded ()
    {
      fieldValueAssign<EstablishField>(UNNEEDED);
      return true;
    }

    bool setSatisfied ()
    {
      fieldValueAssign<EstablishField>(SATISFIED);
      return true;
    }

    bool setIncomplete ()
    {
      fieldValueAssign<EstablishField>(INCOMPLETE);
      return true;
    }

    bool isSeen () const
    { return fieldValueIs<SolverStateField>( SEEN ); }

    bool isImpossible () const
    { return fieldValueIs<SolverStateField>( IMPOSSIBLE ); }

    bool setSeen (bool value)
    {
      fieldValueAssign<SolverStateField>( value ? SEEN : NORMAL );
      return true;
    }

    bool setImpossible (bool value)
    {
      fieldValueAssign<SolverStateField>( value ? IMPOSSIBLE : NORMAL );
      return true;
    }

    bool setStatus( ResStatus newStatus_r )
    {
      // State field is immutable!
      if ( _bitfield.value<StateField>() != newStatus_r._bitfield.value<StateField>() )
        return false;
      // Transaction state change allowed?
      if ( ! setTransactValue( newStatus_r.getTransactValue(), newStatus_r.getTransactByValue() ) )
        return false;

      // Ok, we take it all..
      _bitfield = newStatus_r._bitfield;
      return true;
    }

    static const ResStatus toBeInstalled;
    static const ResStatus toBeInstalledSoft;
    static const ResStatus toBeUninstalled;
    static const ResStatus toBeUninstalledSoft;
    static const ResStatus toBeUninstalledDueToUnlink;
    static const ResStatus toBeUninstalledDueToObsolete;
    static const ResStatus toBeUninstalledDueToUpgrade;
    static const ResStatus installed;   // installed, status after successful target 'install' commit
    static const ResStatus uninstalled; // uninstalled, status after successful target 'uninstall' commit
    static const ResStatus satisfied;   // uninstalled, satisfied
    static const ResStatus complete;    // installed, satisfied
    static const ResStatus unneeded;    // uninstalled, unneeded
    static const ResStatus needed;      // uninstalled, incomplete
    static const ResStatus incomplete;  // installed, incomplete
    static const ResStatus impossible;  // uninstallable

  private:
    ResStatus( StateValue s,
               EstablishValue e     = UNDETERMINED,
               TransactValue t      = KEEP_STATE,
               InstallDetailValue i = EXPLICIT_INSTALL,
               RemoveDetailValue r  = EXPLICIT_REMOVE,
               SolverStateValue ssv = NORMAL );

    template<class _Field>
      bool fieldValueIs( FieldType val_r ) const
      { return _bitfield.isEqual<_Field>( val_r ); }

    template<class _Field>
      void fieldValueAssign( FieldType val_r )
      { _bitfield.assign<_Field>( val_r ); }

    template<class _Field>
      bool isGreaterThan( FieldType val_r )
          { return _bitfield.value<_Field>() > val_r; }

    template<class _Field>
      bool isLessThan( FieldType val_r )
          { return _bitfield.value<_Field>() < val_r; }

  private:
    BitFieldType _bitfield;
  };

  std::ostream & operator<<( std::ostream & str, const ResStatus & obj );

  inline bool operator==( const ResStatus & lhs, const ResStatus & rhs )
  { return lhs._bitfield == rhs._bitfield; }

  inline bool operator!=( const ResStatus & lhs, const ResStatus & rhs )
  { return ! (lhs == rhs); }

} // namespace zypp
#endif // ZYPP_RESSTATUS_H

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