[ONOS-7602]Implement support for P4Data in PI framework and P4Runtime southbound

Change-Id: I9c0c76fb29b8c3aa36f39bde62e825f0f0094253
diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiEnumString.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiEnumString.java
new file mode 100644
index 0000000..74481ea
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+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/data/PiEnumString.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * 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.pi.runtime.data;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Objects;
+import org.onosproject.net.pi.model.PiData;
+
+/**
+ * EnumString entity in a protocol-independent pipeline.
+ */
+@Beta
+public final class PiEnumString implements PiData {
+    private final String enumString;
+
+    /**
+     * Creates a new protocol-independent enum string instance.
+     *
+     * @param enumString enum string
+     */
+    private PiEnumString(String enumString) {
+        this.enumString = enumString;
+    }
+
+    /**
+     * Returns a new protocol-independent enum string.
+     * @param enumString enum string
+     * @return enum string
+     */
+    public static PiEnumString of(String enumString) {
+        return new PiEnumString(enumString);
+    }
+
+    /**
+     * Return protocol-independent enum string instance.
+     *
+     * @return enum string
+     */
+    public String enumString() {
+        return this.enumString;
+    }
+
+    @Override
+    public Type type() {
+        return Type.ENUMSTRING;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        PiEnumString enumStr = (PiEnumString) o;
+        return Objects.equal(enumString, enumStr.enumString);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(enumString);
+    }
+
+    @Override
+    public String toString() {
+        return enumString;
+    }
+}
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