DecodeTrace: Reset cached trace properties when decoder stack resets
[pulseview.git] / pv / views / trace / viewitemiterator.hpp
1 /*
2  * This file is part of the PulseView project.
3  *
4  * Copyright (C) 2014 Joel Holdsworth <joel@airwebreathe.org.uk>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #ifndef PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
21 #define PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP
22
23 #include <algorithm>
24 #include <cassert>
25 #include <iterator>
26 #include <memory>
27 #include <stack>
28 #include <type_traits>
29 #include <vector>
30
31 #include <pv/session.hpp>
32
33 using std::dynamic_pointer_cast;
34 using std::forward_iterator_tag;
35 using std::shared_ptr;
36 using std::stack;
37
38 namespace pv {
39 namespace views {
40 namespace trace {
41
42 template<class Owner, class Item> class ViewItemIterator
43 {
44 public:
45         typedef typename Owner::item_list::const_iterator child_iterator;
46         typedef shared_ptr<Item> value_type;
47         typedef ptrdiff_t difference_type;
48         typedef value_type pointer;
49         typedef const value_type& reference;
50         typedef forward_iterator_tag iterator_category;
51
52 public:
53         ViewItemIterator(Owner *owner) :
54                 owner_stack_({owner}) {}
55
56         ViewItemIterator(Owner *owner, child_iterator iter) :
57                 owner_stack_({owner}) {
58                 assert(owner);
59                 if (iter != owner->child_items().end())
60                         iter_stack_.push(iter);
61         }
62
63         ViewItemIterator(const ViewItemIterator<Owner, Item> &o) :
64                 owner_stack_(o.owner_stack_),
65                 iter_stack_(o.iter_stack_) {}
66
67         reference operator*() const {
68                 return *iter_stack_.top();
69         }
70
71         reference operator->() const {
72                 return *this;
73         }
74
75         ViewItemIterator<Owner, Item>& operator++() {
76                 assert(!owner_stack_.empty());
77                 assert(!iter_stack_.empty());
78
79                 shared_ptr<Owner> owner(dynamic_pointer_cast<Owner>(
80                         *iter_stack_.top()));
81                 if (owner && !owner->child_items().empty()) {
82                         owner_stack_.push(owner.get());
83                         iter_stack_.push(owner->child_items().begin());
84                 } else {
85                         while (!iter_stack_.empty() && (++iter_stack_.top()) ==
86                                 owner_stack_.top()->child_items().end()) {
87                                 owner_stack_.pop();
88                                 iter_stack_.pop();
89                         }
90                 }
91
92                 return *this;
93         }
94
95         ViewItemIterator<Owner, Item> operator++(int) {
96                 ViewItemIterator<Owner, Item> pre = *this;
97                 ++*this;
98                 return pre;
99         }
100
101         bool operator==(const ViewItemIterator &o) const {
102                 return (iter_stack_.empty() && o.iter_stack_.empty()) || (
103                         iter_stack_.size() == o.iter_stack_.size() &&
104                         owner_stack_.top() == o.owner_stack_.top() &&
105                         iter_stack_.top() == o.iter_stack_.top());
106         }
107
108         bool operator!=(const ViewItemIterator &o) const {
109                 return !((const ViewItemIterator&)*this == o);
110         }
111
112         void swap(ViewItemIterator<Owner, Item>& other) {
113                 swap(owner_stack_, other.owner_stack_);
114                 swap(iter_stack_, other.iter_stack_);
115         }
116
117 private:
118         stack<Owner*> owner_stack_;
119         stack<child_iterator> iter_stack_;
120 };
121
122 template<class Owner, class Item>
123 void swap(ViewItemIterator<Owner, Item>& a, ViewItemIterator<Owner, Item>& b)
124 {
125         a.swap(b);
126 }
127
128 } // namespace trace
129 } // namespace views
130 } // namespace pv
131
132 #endif // PULSEVIEW_PV_VIEWS_TRACEVIEW_VIEWITEMITERATOR_HPP