[SEBA-144] Operational Status DHCP L2 Relay.

Cherry-picked from dhcpl2relay-1.6

Change-Id: I58aab083152793af36dfd34fa91cd78385fd2ed7
Signed-off-by: Marcos Aurelio Carrero <mcarrero@furukawalatam.com>
diff --git a/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersIdentifier.java b/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersIdentifier.java
new file mode 100644
index 0000000..63587e1
--- /dev/null
+++ b/app/src/main/java/org/opencord/dhcpl2relay/impl/DhcpL2RelayCountersIdentifier.java
@@ -0,0 +1,69 @@
+/*
+ * 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.opencord.dhcpl2relay.impl;
+
+import org.opencord.dhcpl2relay.DhcpL2RelayEvent;
+
+import java.util.Objects;
+
+/**
+ * Represents DHCP relay counters identifier.
+ */
+public final class DhcpL2RelayCountersIdentifier {
+    final String counterClassKey;
+    final Enum<DhcpL2RelayCounters> counterTypeKey;
+
+    /**
+     * Creates a default global counter identifier for a given counterType.
+     *
+     * @param counterTypeKey Identifies the supported type of DHCP relay counters
+     */
+    public DhcpL2RelayCountersIdentifier(DhcpL2RelayCounters counterTypeKey) {
+        this.counterClassKey = DhcpL2RelayEvent.GLOBAL_COUNTER;
+        this.counterTypeKey = counterTypeKey;
+    }
+
+    /**
+     * Creates a counter identifier. A counter is defined by the key pair &lt;counterClass, counterType&gt;,
+     * where counterClass can be maybe global or the subscriber ID and counterType is the supported DHCP message type.
+     *
+     * @param counterClassKey Identifies which class the counter is assigned (global or per subscriber)
+     * @param counterTypeKey Identifies the supported type of DHCP relay counters
+     */
+    public DhcpL2RelayCountersIdentifier(String counterClassKey, DhcpL2RelayCounters counterTypeKey) {
+        this.counterClassKey = counterClassKey;
+        this.counterTypeKey = counterTypeKey;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DhcpL2RelayCountersIdentifier) {
+            final DhcpL2RelayCountersIdentifier other = (DhcpL2RelayCountersIdentifier) obj;
+            return Objects.equals(this.counterClassKey, other.counterClassKey)
+                    && Objects.equals(this.counterTypeKey, other.counterTypeKey);
+        }
+
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(counterClassKey, counterTypeKey);
+    }
+}
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