Define codec interface for discrete resources

The codec defines how to encode the given resource into an integer and
to decode the given interger to a resource.

This is for ONOS-4281.

Change-Id: I5e9143c9f0285f588274f6649a146bbc1e13dcdb
diff --git a/core/api/src/main/java/org/onosproject/net/resource/MplsCodec.java b/core/api/src/main/java/org/onosproject/net/resource/MplsCodec.java
new file mode 100644
index 0000000..8187d94
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/resource/MplsCodec.java
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2016-present 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.net.resource;
+
+import com.google.common.annotations.Beta;
+import org.onlab.packet.MplsLabel;
+
+import java.util.Optional;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Codec for MplsLabel.
+ */
+@Beta
+public final class MplsCodec implements DiscreteResourceCodec {
+    @Override
+    public int encode(DiscreteResource resource) {
+        Optional<MplsLabel> mpls = resource.valueAs(MplsLabel.class);
+        checkArgument(mpls.isPresent());
+        return mpls.map(MplsLabel::toInt).get();
+    }
+
+    @Override
+    public DiscreteResource decode(DiscreteResourceId parent, int value) {
+        return Resources.discrete(parent, MplsLabel.mplsLabel(value)).resource();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return MplsCodec.class.hashCode();
+    }
+}