# Katabatic - Routing Toolbox

Observer.h
1 // -*- C++ -*-
2 //
3 // This file is part of the Coriolis Software.
4 // Copyright (c) UPMC 2008-2018, All Rights Reserved
5 //
6 // +-----------------------------------------------------------------+
7 // | C O R I O L I S |
8 // | K a t a b a t i c - Routing Toolbox |
9 // | |
10 // | Author : Jean-Paul CHAPUT |
11 // | E-mail : Jean-Paul.Chaput@lip6.fr |
12 // | =============================================================== |
13 // | C++ Header : "./katabatic/Observer.h" |
14 // +-----------------------------------------------------------------+
15
16
17 #ifndef KATABATIC_OBSERVER_H
18 #define KATABATIC_OBSERVER_H
19
20 #include "hurricane/Error.h"
21
22
23 namespace Katabatic {
24
25
26 // -------------------------------------------------------------------
27 // Classes : "BaseObserver" & "Observer".
28
29 class BaseObserver {
30 public:
31 virtual void notify ( unsigned int flags );
32 };
33
34
35 template< typename T>
36 class Observer : public BaseObserver {
37 public:
38 inline Observer ( const T* owner );
39 inline T* getOwner () const;
40 private:
41 Observer ( const Observer& );
42 private:
43 static int _ownerOffset;
44 };
45
46
47 template< typename T>
48 int Observer<T>::_ownerOffset = -1;
49
50 template< typename T>
51 inline Observer<T>::Observer ( const T* owner )
52 : BaseObserver()
53 {
54 if (owner == NULL)
55 throw Hurricane::Error( "Observer::Observer(), attempt to create with NULL owner." );
56
57 if (_ownerOffset < 0)
58 _ownerOffset = (unsigned long)this - (unsigned long)owner;
59 }
60
61
62 template< typename T>
63 inline T* Observer<T>::getOwner () const { return reinterpret_cast<T*>((unsigned long)this - _ownerOffset); }
64
65
66 // -------------------------------------------------------------------
67 // Class : "Observable".
68
69 class Observable {
70 public:
71 inline Observable ();
72 template< typename T >
73 inline T* getObserver ();
74 inline void addObserver ( BaseObserver* );
75 inline void removeObserver ( BaseObserver* );
76 inline void notify ( unsigned int flags );
77 private:
78 Observable ( const Observable& );
79 private:
80 BaseObserver* _observer;
81 };
82
83
84 inline Observable::Observable ()
85 : _observer(NULL)
86 { }
87
88
89 template< typename T >
90 T* Observable::getObserver ()
91 {
92 if (_observer) return (dynamic_cast< Observer<T>* >( _observer ))->getOwner();
93 return NULL;
94 }
95
96 inline void Observable::addObserver ( BaseObserver* observer )
97 {
98 if (_observer)
99 throw Hurricane::Error( "Observable::addObserver(), trying to add a second observer which is unsupported." );
100 _observer = observer;
101 }
102
103 inline void Observable::removeObserver ( BaseObserver* observer )
104 {
105 if (_observer != observer)
106 throw Hurricane::Error( "Observable::removeObserver(), trying to remove wrong observer." );
107 _observer = NULL;
108 }
109
110
111 inline void Observable::notify ( unsigned int flags )
112 {
113 if (_observer) _observer->notify( flags );
114 }
115
116
117 } // Katabatic namespace.
118
119 #endif
Katabatic::Observable::removeObserver
void removeObserver(BaseObserver *)
Definition: Observer.h:103
Katabatic::BaseObserver::notify
virtual void notify(unsigned int flags)
Definition: Observer.cpp:26
Hurricane::Error
Katabatic::Observable
Observer Design Pattern, Subject part.
Definition: Observer.h:69
Katabatic::Observable::Observable
Observable()
Definition: Observer.h:84
Katabatic
The namespace dedicated to Katabatic.
Definition: Katabatic.dox:13
Katabatic::Observer::Observer
Observer(const T *owner)
Definition: Observer.h:51
Katabatic::Observable::notify
void notify(unsigned int flags)
Definition: Observer.h:111
Katabatic::Observer::getOwner
T * getOwner() const
Definition: Observer.h:63
Katabatic::Observable::addObserver
void addObserver(BaseObserver *)
Definition: Observer.h:96
Katabatic::BaseObserver
Observer Design Pattern, Observer part.
Definition: Observer.h:29
Katabatic::Observer
Observer Design Pattern, Observer part.
Definition: Observer.h:36
Katabatic::Observable::getObserver
T * getObserver()
Definition: Observer.h:90

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