From 3e3549847cd81bde3fd3ccb4da076af87fe7f0f2 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 16 Aug 2018 00:31:28 +0300
Subject: [PATCH] Allow range conditions to be merged within and conditions

---
 source/rangecondition.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/source/rangecondition.h b/source/rangecondition.h
index 0d93994..8355135 100644
--- a/source/rangecondition.h
+++ b/source/rangecondition.h
@@ -20,6 +20,8 @@ public:
 	RangeCondition(Type, Type);
 
 	virtual RangeCondition<T> *clone() const;
+	virtual bool can_merge(const Condition &, const CompoundCondition &) const;
+	virtual RangeCondition<T> *merge(const std::vector<Condition *> &, const CompoundCondition &) const;
 	virtual void add_lines(std::list<FilterStatement> &) const;
 };
 
@@ -130,6 +132,30 @@ RangeCondition<T> *RangeCondition<T>::clone() const
 	return new RangeCondition<T>(min, max);
 }
 
+template<typename T>
+bool RangeCondition<T>::can_merge(const Condition &other, const CompoundCondition &parent) const
+{
+	return dynamic_cast<const RangeCondition<T> *>(&other) && dynamic_cast<const AndCondition *>(&parent);
+}
+
+template<typename T>
+RangeCondition<T> *RangeCondition<T>::merge(const std::vector<Condition *> &conditions, const CompoundCondition &parent) const
+{
+	if(dynamic_cast<const AndCondition *>(&parent) && !conditions.empty())
+	{
+		RangeCondition<T> *result = new RangeCondition<T>(Traits::get_min(), Traits::get_max());
+		for(std::vector<Condition *>::const_iterator i=conditions.begin(); i!=conditions.end(); ++i)
+		{
+			const RangeCondition<T> *c = static_cast<RangeCondition<T> *>(*i);
+			result->min = std::max(result->min, c->min);
+			result->max = std::min(result->max, c->max);
+		}
+		return result;
+	}
+	else
+		return 0;
+}
+
 template<typename T>
 void RangeCondition<T>::add_lines(std::list<FilterStatement> &st) const
 {
-- 
2.43.0