Make JSON codecs immutable

The contract for JSON codecs requires that they have no
local context.  Make them all immutable, and test that they
stay immutable.

Change-Id: Ia3930b844ede231940da05699f5f08605f946e0c

@@ -23,7 +23,7 @@ import org.onosproject.net.Annotations;
 /**
  * Annotations JSON codec.
  */
-public class AnnotationsCodec extends JsonCodec<Annotations> {
+public final class AnnotationsCodec extends JsonCodec<Annotations> {
 
     @Override
     public ObjectNode encode(Annotations annotations, CodecContext context) {

@@ -26,7 +26,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Application JSON codec.
  */
-public class ApplicationCodec extends JsonCodec<Application> {
+public final class ApplicationCodec extends JsonCodec<Application> {
 
     @Override
     public ObjectNode encode(Application app, CodecContext context) {

@@ -27,7 +27,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Connection point JSON codec.
  */
-public class ConnectPointCodec extends JsonCodec<ConnectPoint> {
+public final class ConnectPointCodec extends JsonCodec<ConnectPoint> {
 
     @Override
     public ObjectNode encode(ConnectPoint point, CodecContext context) {

@@ -31,7 +31,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Connectivity intent codec.
  */
-public class ConnectivityIntentCodec extends JsonCodec<ConnectivityIntent> {
+public final class ConnectivityIntentCodec extends JsonCodec<ConnectivityIntent> {
 
     @Override
     public ObjectNode encode(ConnectivityIntent intent, CodecContext context) {

@@ -36,7 +36,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Constraint JSON codec.
  */
-public class ConstraintCodec extends JsonCodec<Constraint> {
+public final class ConstraintCodec extends JsonCodec<Constraint> {
 
     /**
      * Encodes a latency constraint.

@@ -29,7 +29,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Criterion codec.
  */
-public class CriterionCodec extends JsonCodec<Criterion> {
+public final class CriterionCodec extends JsonCodec<Criterion> {
 
     protected static final Logger log = LoggerFactory.getLogger(CriterionCodec.class);
 

@@ -25,7 +25,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Device JSON codec.
  */
-public class DeviceCodec extends AnnotatedCodec<Device> {
+public final class DeviceCodec extends AnnotatedCodec<Device> {
 
     @Override
     public ObjectNode encode(Device device, CodecContext context) {

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Ethernet codec.
  */
-public class EthernetCodec extends JsonCodec<Ethernet> {
+public final class EthernetCodec extends JsonCodec<Ethernet> {
 
     protected static final Logger log = LoggerFactory.getLogger(CriterionCodec.class);
 

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Flow entry JSON codec.
  */
-public class FlowEntryCodec extends JsonCodec<FlowEntry> {
+public final class FlowEntryCodec extends JsonCodec<FlowEntry> {
 
     @Override
     public ObjectNode encode(FlowEntry flowEntry, CodecContext context) {

@@ -29,7 +29,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Host JSON codec.
  */
-public class HostCodec extends AnnotatedCodec<Host> {
+public final class HostCodec extends AnnotatedCodec<Host> {
 
     @Override
     public ObjectNode encode(Host host, CodecContext context) {

@@ -26,7 +26,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Host JSON codec.
  */
-public class HostLocationCodec extends JsonCodec<HostLocation> {
+public final class HostLocationCodec extends JsonCodec<HostLocation> {
 
     @Override
     public ObjectNode encode(HostLocation hostLocation, CodecContext context) {

@@ -27,7 +27,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Host to host intent codec.
  */
-public class HostToHostIntentCodec extends JsonCodec<HostToHostIntent> {
+public final class HostToHostIntentCodec extends JsonCodec<HostToHostIntent> {
 
     @Override
     public ObjectNode encode(HostToHostIntent intent, CodecContext context) {

@@ -33,7 +33,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Instruction codec.
  */
-public class InstructionCodec extends JsonCodec<Instruction> {
+public final class InstructionCodec extends JsonCodec<Instruction> {
 
     protected static final Logger log = LoggerFactory.getLogger(InstructionCodec.class);
 

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Intent JSON codec.
  */
-public class IntentCodec extends JsonCodec<Intent> {
+public final class IntentCodec extends JsonCodec<Intent> {
 
     @Override
     public ObjectNode encode(Intent intent, CodecContext context) {

@@ -27,7 +27,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Link JSON codec.
  */
-public class LinkCodec extends AnnotatedCodec<Link> {
+public final class LinkCodec extends AnnotatedCodec<Link> {
 
     @Override
     public ObjectNode encode(Link link, CodecContext context) {

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Path JSON codec.
  */
-public class PathCodec extends AnnotatedCodec<Path> {
+public final class PathCodec extends AnnotatedCodec<Path> {
     @Override
     public ObjectNode encode(Path path, CodecContext context) {
         checkNotNull(path, "Path cannot be null");

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Point to point intent codec.
  */
-public class PointToPointIntentCodec extends JsonCodec<PointToPointIntent> {
+public final class PointToPointIntentCodec extends JsonCodec<PointToPointIntent> {
 
     @Override
     public ObjectNode encode(PointToPointIntent intent, CodecContext context) {

@@ -25,7 +25,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Device port JSON codec.
  */
-public class PortCodec extends AnnotatedCodec<Port> {
+public final class PortCodec extends AnnotatedCodec<Port> {
 
     @Override
     public ObjectNode encode(Port port, CodecContext context) {

@@ -26,7 +26,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Topology cluster JSON codec.
  */
-public class TopologyClusterCodec extends JsonCodec<TopologyCluster> {
+public final class TopologyClusterCodec extends JsonCodec<TopologyCluster> {
 
     @Override
     public ObjectNode encode(TopologyCluster cluster, CodecContext context) {

@@ -26,7 +26,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Topology JSON codec.
  */
-public class TopologyCodec extends JsonCodec<Topology> {
+public final class TopologyCodec extends JsonCodec<Topology> {
 
     @Override
     public ObjectNode encode(Topology topology, CodecContext context) {

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Traffic selector codec.
  */
-public class TrafficSelectorCodec extends JsonCodec<TrafficSelector> {
+public final class TrafficSelectorCodec extends JsonCodec<TrafficSelector> {
     @Override
     public ObjectNode encode(TrafficSelector selector, CodecContext context) {
         checkNotNull(selector, "Traffic selector cannot be null");

@@ -28,7 +28,7 @@ import static com.google.common.base.Preconditions.checkNotNull;
 /**
  * Traffic treatment codec.
  */
-public class TrafficTreatmentCodec extends JsonCodec<TrafficTreatment> {
+public final class TrafficTreatmentCodec extends JsonCodec<TrafficTreatment> {
     @Override
     public ObjectNode encode(TrafficTreatment treatment, CodecContext context) {
         checkNotNull(treatment, "Traffic treatment cannot be null");

+/*
+ * 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.codec.impl;
+
+import org.junit.Test;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutableBaseClass;
+
+/**
+ * Tests to assure that the codec classes follow the contract of having
+ * no local context.
+ */
+public class ImmutableCodecsTest {
+
+    /**
+     * Checks that the codec classes adhere to the contract that there cannot
+     * be any local context in a codec.
+     */
+    @Test
+    public void checkImmutability() {
+        assertThatClassIsImmutableBaseClass(AnnotatedCodec.class);
+        assertThatClassIsImmutable(AnnotationsCodec.class);
+        assertThatClassIsImmutable(ApplicationCodec.class);
+        assertThatClassIsImmutable(ConnectivityIntentCodec.class);
+        assertThatClassIsImmutable(ConnectPointCodec.class);
+        assertThatClassIsImmutable(ConstraintCodec.class);
+        assertThatClassIsImmutable(CriterionCodec.class);
+        assertThatClassIsImmutable(DeviceCodec.class);
+        assertThatClassIsImmutable(EthernetCodec.class);
+        assertThatClassIsImmutable(FlowEntryCodec.class);
+        assertThatClassIsImmutable(HostCodec.class);
+        assertThatClassIsImmutable(HostLocationCodec.class);
+        assertThatClassIsImmutable(HostToHostIntentCodec.class);
+        assertThatClassIsImmutable(InstructionCodec.class);
+        assertThatClassIsImmutable(IntentCodec.class);
+        assertThatClassIsImmutable(LinkCodec.class);
+        assertThatClassIsImmutable(PathCodec.class);
+        assertThatClassIsImmutable(PointToPointIntentCodec.class);
+        assertThatClassIsImmutable(PortCodec.class);
+        assertThatClassIsImmutable(TopologyClusterCodec.class);
+        assertThatClassIsImmutable(TopologyCodec.class);
+        assertThatClassIsImmutable(TrafficSelectorCodec.class);
+        assertThatClassIsImmutable(TrafficTreatmentCodec.class);
+    }
+}