Add Codecs class holding DiscreteResourceCodecs
This is for ONOS-4281
Change-Id: I156f23aa7027381cdd4453631654d7eaa33858dd
(cherry picked from commit 32c07af24e7119f71cca87196cde76eacacd0f32)
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/Codecs.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/Codecs.java
new file mode 100644
index 0000000..6b15e51
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/Codecs.java
@@ -0,0 +1,77 @@
+/*
+ * 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.store.resource.impl;
+
+import org.onlab.packet.MplsLabel;
+import org.onlab.packet.VlanId;
+import org.onosproject.net.resource.DiscreteResource;
+import org.onosproject.net.resource.DiscreteResourceCodec;
+import org.onosproject.net.resource.MplsCodec;
+import org.onosproject.net.resource.VlanCodec;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A set of {@link DiscreteResourceCodec DiscreteResourceCodecs}.
+ */
+final class Codecs {
+ private static final Codecs INSTANCE = new Codecs();
+
+ private final Map<Class<?>, DiscreteResourceCodec<?>> codecs;
+
+ /**
+ * Returns an instance of this class.
+ *
+ * @return instance
+ */
+ static Codecs getInstance() {
+ return INSTANCE;
+ }
+
+ private Codecs() {
+ this.codecs = new HashMap<>();
+ init();
+ }
+
+ private void init() {
+ codecs.put(VlanId.class, new VlanCodec());
+ codecs.put(MplsLabel.class, new MplsCodec());
+ }
+
+ /**
+ * Returns if there is a codec available for the specified resource.
+ *
+ * @param resource resource to be encoded
+ * @return true if this class can encode the resource, otherwise false.
+ */
+ boolean isEncodable(DiscreteResource resource) {
+ return resource.valueAs(Object.class)
+ .map(Object::getClass)
+ .map(codecs::containsKey)
+ .orElse(Boolean.FALSE);
+ }
+
+ /**
+ * Returns the codec for the specified class.
+ *
+ * @param cls class of an instance to be encoded
+ * @return the codec for the class
+ */
+ DiscreteResourceCodec<?> getCodec(Class<?> cls) {
+ return codecs.get(cls);
+ }
+}