[ONOS-7051] Support for P4Runtime meters

Change-Id: Id71374af65aeb84b71636b4ec230dc6001a77a8b
diff --git a/core/api/src/main/java/org/onosproject/net/pi/runtime/PiMeterBand.java b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiMeterBand.java
new file mode 100644
index 0000000..efa53ff
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/pi/runtime/PiMeterBand.java
@@ -0,0 +1,86 @@
+/*
+ * 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 java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * Represents a band used within a meter.
+ */
+@Beta
+public class PiMeterBand {
+    private final long rate;
+    private final long burst;
+
+    /**
+     * Creates a band with rate and burst.
+     *
+     * @param rate  rate of this band
+     * @param burst burst of this band
+     */
+    public PiMeterBand(long rate, long burst) {
+        this.rate = rate;
+        this.burst = burst;
+    }
+
+    /**
+     * Returns the rate of this band.
+     *
+     * @return rate of this band
+     */
+    public long rate() {
+        return rate;
+    }
+
+    /**
+     * Returns the burst of this band.
+     *
+     * @return burst of this band
+     */
+    public long burst() {
+        return burst;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(rate, burst);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof PiMeterBand) {
+            PiMeterBand that = (PiMeterBand) obj;
+            return Objects.equals(rate, that.rate) &&
+                    Objects.equals(burst, that.burst);
+
+        }
+        return false;
+    }
+
+    public String toString() {
+        return toStringHelper(this)
+                .add("rate", rate)
+                .add("burst", burst).toString();
+    }
+}