flow specification.

Change-Id: Iacb8eae8fe7cce769a019ecffa6073c015ff80d1
diff --git a/drivers/flowspec/src/main/java/org/onosproject/driver/flowspec/extensions/ExtMatchExtension.java b/drivers/flowspec/src/main/java/org/onosproject/driver/flowspec/extensions/ExtMatchExtension.java
new file mode 100644
index 0000000..6cdbd3a
--- /dev/null
+++ b/drivers/flowspec/src/main/java/org/onosproject/driver/flowspec/extensions/ExtMatchExtension.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017-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.driver.flowspec.extensions;
+
+import org.onlab.util.KryoNamespace;
+import org.onosproject.flowapi.ExtFlowContainer;
+import org.onosproject.net.flow.AbstractExtension;
+import org.onosproject.net.flow.criteria.ExtensionSelector;
+import org.onosproject.net.flow.criteria.ExtensionSelectorType;
+
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+ /**
+  * Implementation of extension selector for multi value.
+  */
+ public final class ExtMatchExtension extends AbstractExtension implements ExtensionSelector  {
+     private ExtFlowContainer container;
+     private final KryoNamespace appKryo = new KryoNamespace.Builder().register(ExtMatchExtension.class).build();
+
+     /**
+      * Creates an object of ExtMatchExtension.
+      */
+     public ExtMatchExtension() {
+         this.container = null;
+     }
+     /**
+      * Returns the container.
+      *
+      * @return the container to match
+      */
+     public ExtFlowContainer container() {
+         return container;
+     }
+
+     @Override
+     public ExtensionSelectorType type() {
+         return ExtensionSelectorType.ExtensionSelectorTypes.EXT_MATCH_FLOW_TYPE.type();
+     }
+
+     @Override
+     public byte[] serialize() {
+         return appKryo.serialize(container);
+     }
+
+     @Override
+     public void deserialize(byte[] data) {
+         container = ExtFlowContainer.of(appKryo.deserialize(data));
+     }
+
+     @Override
+     public String toString() {
+         return toStringHelper(type().toString())
+                 .add("container", container)
+                 .toString();
+     }
+
+     @Override
+     public int hashCode() {
+         return Objects.hash(type(), container);
+     }
+
+     @Override
+     public boolean equals(Object obj) {
+         if (this == obj) {
+             return true;
+         }
+         if (obj instanceof ExtMatchExtension) {
+             ExtMatchExtension that = (ExtMatchExtension) obj;
+             return Objects.equals(container, that.container) &&
+                     Objects.equals(this.type(), that.type());
+         }
+         return false;
+     }
+ }