ONOS-7887 Rename action profile-related entities

Members can exist outside of a group. Previous naming was ambiguous
about this.

Action group -> action profile group
Action group member -> action profile member

Change-Id: I5097e92253353d355b864e689f9653df2d318230
diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionProfileGroupId.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionProfileGroupId.java
new file mode 100644
index 0000000..206525a
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiActionProfileGroupId.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2017-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;
+
+import com.google.common.annotations.Beta;
+import org.onlab.util.Identifier;
+
+/**
+ * Identifier of an action profile group in a protocol-independent pipeline,
+ * unique within the scope of an action profile.
+ */
+@Beta
+public final class PiActionProfileGroupId extends Identifier<Integer> implements PiTableAction {
+
+    private PiActionProfileGroupId(int id) {
+        super(id);
+    }
+
+    /**
+     * Returns an action profile group identifier for the given integer value.
+     *
+     * @param id identifier
+     * @return action profile group
+     */
+    public static PiActionProfileGroupId of(int id) {
+        return new PiActionProfileGroupId(id);
+    }
+
+    /*
+    In P4Runtime, groups can be referenced directly as table actions (i.e.
+    without invoking the selector). In future we should consider having a more
+    appropriate wrapper class for group IDs, instead of implementing the
+    PiTableAction interface.
+     */
+    @Override
+    public Type type() {
+        return Type.ACTION_PROFILE_GROUP_ID;
+    }
+}