From 13ef5b22effca60ac26bce71d4c67011d4c533aa Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 14 Sep 2015 20:31:30 +0100
Subject: Add basic factory support

---
 libadhocutil/factory.h                 | 36 +++++++++++++++++++
 libadhocutil/factory.impl.h            | 25 +++++++++++++
 libadhocutil/unittests/Jamfile.jam     | 10 ++++++
 libadhocutil/unittests/testFactory.cpp | 65 ++++++++++++++++++++++++++++++++++
 4 files changed, 136 insertions(+)
 create mode 100644 libadhocutil/factory.h
 create mode 100644 libadhocutil/factory.impl.h
 create mode 100644 libadhocutil/unittests/testFactory.cpp

diff --git a/libadhocutil/factory.h b/libadhocutil/factory.h
new file mode 100644
index 0000000..2493525
--- /dev/null
+++ b/libadhocutil/factory.h
@@ -0,0 +1,36 @@
+#ifndef ADHOCUTIL_FACTORY_H
+#define ADHOCUTIL_FACTORY_H
+
+#include "plugins.h"
+
+namespace AdHoc {
+	template <typename Base, typename ... Params>
+	class Factory {
+		public:
+			virtual ~Factory() = 0;
+
+			virtual Base * create(const Params & ...) const = 0;
+
+			template <typename Impl, typename _ = Factory<Base, Params...>>
+			class For : public _
+			{
+				public:
+					Base * create(const Params & ... p) const override
+					{
+						return new Impl(p...);
+					}
+			};
+
+			static const Factory * get(const std::string & name);
+			static Base * create(const std::string & name, const Params & ... p);
+	};
+}
+
+#define NAMEDFACTORY(Name, Implementation, BaseFactory) \
+	NAMEDPLUGIN(Name, BaseFactory::For<Implementation>, BaseFactory)
+
+#define FACTORY(Implementation, BaseFactory) \
+	NAMEDFACTORY(#Implementation, Implementation, BaseFactory)
+
+#endif
+
diff --git a/libadhocutil/factory.impl.h b/libadhocutil/factory.impl.h
new file mode 100644
index 0000000..4e34310
--- /dev/null
+++ b/libadhocutil/factory.impl.h
@@ -0,0 +1,25 @@
+#ifndef ADHOCUTIL_FACTORY_IMPL_H
+#define ADHOCUTIL_FACTORY_IMPL_H
+
+#include "factory.h"
+
+namespace AdHoc {
+	template <typename Base, typename ... Params>
+	Factory<Base, Params ...>::~Factory() = default;
+
+	template <typename Base, typename ... Params>
+	const Factory<Base, Params...> *
+	Factory<Base, Params...>::get(const std::string & name)
+	{
+		return PluginManager::getDefault()->get<Factory>(name)->implementation();
+	}
+
+	template <typename Base, typename ... Params>
+	Base *
+	Factory<Base, Params...>::create(const std::string & name, const Params & ... p)
+	{
+		return get(name)->create(p...);
+	}
+}
+#endif
+
diff --git a/libadhocutil/unittests/Jamfile.jam b/libadhocutil/unittests/Jamfile.jam
index 77aede4..ecee7d1 100644
--- a/libadhocutil/unittests/Jamfile.jam
+++ b/libadhocutil/unittests/Jamfile.jam
@@ -129,3 +129,13 @@ run
 	testPlugins
 	;
 
+run
+	testFactory.cpp
+	: : :
+	<define>BOOST_TEST_DYN_LINK
+	<library>..//adhocutil
+	<library>boost_utf
+	:
+	testFactory
+	;
+
diff --git a/libadhocutil/unittests/testFactory.cpp b/libadhocutil/unittests/testFactory.cpp
new file mode 100644
index 0000000..9b463f1
--- /dev/null
+++ b/libadhocutil/unittests/testFactory.cpp
@@ -0,0 +1,65 @@
+#define BOOST_TEST_MODULE Factory
+#include <boost/test/unit_test.hpp>
+
+#include "factory.h"
+#include "factory.impl.h"
+#include "plugins.h"
+#include "plugins.impl.h"
+
+using namespace AdHoc;
+
+class BaseThing {
+	public:
+		BaseThing(int, const std::string &){}
+
+		virtual void execute() const = 0;
+};
+
+class ImplOfThing : public BaseThing {
+	public:
+		ImplOfThing(int i, const std::string & s) : BaseThing(i, s) {}
+		void execute() const { }
+};
+class OtherImplOfThing : public BaseThing {
+	public:
+		OtherImplOfThing(int i, const std::string & s) : BaseThing(i, s) {}
+		void execute() const { }
+};
+
+typedef AdHoc::Factory<BaseThing, int, std::string> BaseThingFactory;
+
+NAMEDFACTORY("a", ImplOfThing, BaseThingFactory);
+FACTORY(OtherImplOfThing, BaseThingFactory);
+
+BOOST_AUTO_TEST_CASE( ready )
+{
+	BOOST_REQUIRE_EQUAL(2, PluginManager::getDefault()->count());
+}
+
+BOOST_AUTO_TEST_CASE( get )
+{
+	auto all = PluginManager::getDefault()->getAll();
+	auto factory1 = PluginManager::getDefault()->get<BaseThingFactory>("a")->implementation();
+	auto factory2 = BaseThingFactory::get("a");
+	auto factory3 = BaseThingFactory::get("OtherImplOfThing");
+	BOOST_REQUIRE(factory1);
+	BOOST_REQUIRE_EQUAL(factory1, factory2);
+	BOOST_REQUIRE(factory3);
+	BOOST_REQUIRE(factory1 != factory3);
+}
+
+BOOST_AUTO_TEST_CASE( create )
+{
+	auto factory1 = BaseThingFactory::get("a");
+	auto factory2 = BaseThingFactory::get("OtherImplOfThing");
+	auto i1 = factory1->create(1, "std");
+	auto i2 = factory1->create(1, "std");
+	auto i3 = factory2->create(1, "std");
+	BOOST_REQUIRE(i1);
+	BOOST_REQUIRE(i2);
+	BOOST_REQUIRE(i3);
+	BOOST_REQUIRE(i1 != i2);
+	BOOST_REQUIRE(i1 != i3);
+	BOOST_REQUIRE(i2 != i3);
+}
+
-- 
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