Implemented the extension framework for selectors.
Change-Id: I577900141889fc70ca54e96cd5d54cfd5194b05d
diff --git a/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java b/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java
new file mode 100644
index 0000000..7336c3c
--- /dev/null
+++ b/protocols/openflow/api/src/main/java/org/onosproject/openflow/controller/ExtensionSelectorInterpreter.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.openflow.controller;
+
+import com.google.common.annotations.Beta;
+import org.onosproject.net.driver.HandlerBehaviour;
+import org.onosproject.net.flow.criteria.ExtensionSelector;
+import org.onosproject.net.flow.criteria.ExtensionSelectorType;
+import org.projectfloodlight.openflow.protocol.OFFactory;
+import org.projectfloodlight.openflow.protocol.oxm.OFOxm;
+
+/**
+ * Interprets extension selectors and converts them to/from OpenFlow objects.
+ */
+@Beta
+public interface ExtensionSelectorInterpreter extends HandlerBehaviour {
+
+ /**
+ * Returns true if the given extension selector is supported by this
+ * driver.
+ *
+ * @param extensionSelectorType extension selector type
+ * @return true if the instruction is supported, otherwise false
+ */
+ boolean supported(ExtensionSelectorType extensionSelectorType);
+
+ /**
+ * Maps an extension selector to an OpenFlow OXM.
+ *
+ * @param factory OpenFlow factory
+ * @param extensionSelector extension selector
+ * @return OpenFlow action
+ */
+ OFOxm<?> mapSelector(OFFactory factory, ExtensionSelector extensionSelector);
+
+ /**
+ * Maps an OpenFlow OXM to an extension selector.
+ *
+ * @param oxm OpenFlow OXM
+ * @return extension selector
+ */
+ ExtensionSelector mapOxm(OFOxm<?> oxm);
+}