Factor out Connector from PatchageCanvas

This finally breaks the dependency of the canvas on the entire application, and
fixes the confusing situation where it wasn't clear whether connect/disconnect
methods made/broke connections on the canvas or on the system.

1 files changed, 67 insertions, 0 deletions

diff --git a/src/Connector.cpp b/src/Connector.cpp
new file mode 100644
index 0000000..c26c7a7
--- /dev/null
+++ b/src/Connector.cpp
@@ -0,0 +1,67 @@
+/* This file is part of Patchage.
+ * Copyright 2007-2020 David Robillard <d@drobilla.net>
+ *
+ * Patchage 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 3 of the License, or (at your option)
+ * any later version.
+ *
+ * Patchage 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 details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "Connector.hpp"
+
+#include "Driver.hpp"
+#include "ILog.hpp"
+#include "PortID.hpp"
+
+#include <unordered_map>
+
+Connector::Connector(ILog& log)
+    : _log(log)
+{}
+
+void
+Connector::add_driver(PortID::Type type, Driver* driver)
+{
+	_drivers.emplace(type, driver);
+}
+
+void
+Connector::connect(const PortID& tail, const PortID& head)
+{
+	if (tail.type() != head.type()) {
+		_log.warning("Unable to connect incompatible port types");
+		return;
+	}
+
+	auto d = _drivers.find(tail.type());
+	if (d == _drivers.end()) {
+		_log.error("No driver for port type");
+		return;
+	}
+
+	d->second->connect(tail, head);
+}
+
+void
+Connector::disconnect(const PortID& tail, const PortID& head)
+{
+	if (tail.type() != head.type()) {
+		_log.error("Unable to disconnect incompatible port types");
+		return;
+	}
+
+	auto d = _drivers.find(tail.type());
+	if (d == _drivers.end()) {
+		_log.error("No driver for port type");
+		return;
+	}
+
+	d->second->disconnect(tail, head);
+}