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/VlanCodec.java b/core/api/src/main/java/org/onosproject/net/resource/VlanCodec.java
new file mode 100644
index 0000000..46754af
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/resource/VlanCodec.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.VlanId;
+
+import java.util.Optional;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Codec for Vlan.
+ */
+@Beta
+public final class VlanCodec implements DiscreteResourceCodec {
+ @Override
+ public int encode(DiscreteResource resource) {
+ Optional<VlanId> vlan = resource.valueAs(VlanId.class);
+ checkArgument(vlan.isPresent());
+ return vlan.map(x -> (int) x.toShort()).get();
+ }
+
+ @Override
+ public DiscreteResource decode(DiscreteResourceId parent, int value) {
+ return Resources.discrete(parent, VlanId.vlanId((short) 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 VlanCodec.class.hashCode();
+ }
+}