Added pv::view::RowItemIterator

[pulseview.git] / pv / view / rowitemiterator.h

diff --git a/pv/view/rowitemiterator.h b/pv/view/rowitemiterator.h
new file mode 100644 (file)
index 0000000..256cdd0
--- /dev/null
+++ b/pv/view/rowitemiterator.h
@@ -0,0 +1,143 @@
+/*
+ * This file is part of the PulseView project.
+ *
+ * Copyright (C) 2014 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef PULSEVIEW_PV_VIEW_ROWITEMITERATOR_H
+#define PULSEVIEW_PV_VIEW_ROWITEMITERATOR_H
+
+#include <algorithm>
+#include <cassert>
+#include <iterator>
+#include <memory>
+#include <stack>
+#include <type_traits>
+#include <vector>
+
+#include <boost/thread.hpp>
+
+#include <pv/sigsession.h>
+
+namespace pv {
+namespace view {
+
+template<class Owner, class Item> class RowItemIterator
+{
+public:
+       typedef typename std::conditional<std::is_const<Owner>::value,
+               typename Owner::item_list::const_iterator,
+               typename Owner::item_list::iterator>::type child_iterator;
+
+       typedef std::shared_ptr<Item> value_type;
+       typedef ptrdiff_t difference_type;
+       typedef value_type pointer;
+       typedef value_type& reference;
+       typedef std::forward_iterator_tag iterator_category;
+
+public:
+       RowItemIterator(Owner *owner) :
+               _owner(owner),
+               _lock(owner->session().signals_mutex()) {}
+
+       RowItemIterator(Owner *owner, child_iterator iter) :
+               _owner(owner),
+               _lock(owner->session().signals_mutex()) {
+               assert(owner);
+               if (iter != owner->child_items().end())
+                       _iter_stack.push(iter);
+       }
+
+       RowItemIterator(const RowItemIterator<Owner, Item> &o) :
+               _owner(o._owner),
+               _lock(*o._lock.mutex()),
+               _iter_stack(o._iter_stack) {}
+
+       reference operator*() const {
+               return *_iter_stack.top();
+       }
+
+       reference operator->() const {
+               return *this;
+       }
+
+       RowItemIterator<Owner, Item>& operator++() {
+               using std::dynamic_pointer_cast;
+               using std::shared_ptr;
+
+               assert(_owner);
+               assert(!_iter_stack.empty());
+
+               shared_ptr<Owner> owner(dynamic_pointer_cast<Owner>(
+                       *_iter_stack.top()));
+               if (owner && !owner->child_items().empty()) {
+                       _owner = owner.get();
+                       _iter_stack.push(owner->child_items().begin());
+               } else {
+                       ++_iter_stack.top();
+                       while (_owner && _iter_stack.top() ==
+                               _owner->child_items().end()) {
+                               _iter_stack.pop();
+                               _owner = _iter_stack.empty() ? nullptr :
+                                       (*_iter_stack.top()++)->owner();
+                       }
+               }
+
+               return *this;
+       }
+
+       RowItemIterator<Owner, Item> operator++(int) {
+               RowItemIterator<Owner, Item> pre = *this;
+               ++*this;
+               return pre;
+       }
+
+       bool operator==(const RowItemIterator &o) const {
+               return (_iter_stack.empty() && o._iter_stack.empty()) ||
+                       (_owner == o._owner &&
+                       _iter_stack.size() == o._iter_stack.size() &&
+                       std::equal(
+                               _owner->child_items().cbegin(),
+                               _owner->child_items().cend(),
+                               o._owner->child_items().cbegin()));
+       }
+
+       bool operator!=(const RowItemIterator &o) const {
+               return !((const RowItemIterator&)*this == o);
+       }
+
+       void swap(RowItemIterator<Owner, Item>& other) {
+               swap(_owner, other._owner);
+               swap(_iter_stack, other._iter_stack);
+       }
+
+private:
+       Owner *_owner;
+       boost::shared_lock<boost::shared_mutex> _lock;
+       std::stack<child_iterator> _iter_stack;
+};
+
+template<class Owner, class Item>
+void swap(RowItemIterator<Owner, Item>& a, RowItemIterator<Owner, Item>& b)
+{
+       a.swap(b);
+}
+
+} // namespace view
+} // namespace pv
+
+#endif // PULSEVIEW_PV_VIEW_ROWITEMITERATOR_H