ADD/REMOVE Option82

Change-Id: I51cfb92f4b2d07c5b588fd96ceb6a37afc6f8f38
diff --git a/src/main/java/org/opencord/dhcpl2relay/packet/DhcpOption82.java b/src/main/java/org/opencord/dhcpl2relay/packet/DhcpOption82.java
new file mode 100644
index 0000000..b673f94
--- /dev/null
+++ b/src/main/java/org/opencord/dhcpl2relay/packet/DhcpOption82.java
@@ -0,0 +1,106 @@
+/*
+ * 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.packet;
+
+import java.io.ByteArrayOutputStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Represents the DHCP Option 82 information. Currently only supports
+ * sub option 1 (agent-circuit-id) and 2 (agent=-relay-id).
+ */
+public class DhcpOption82 {
+
+    private String agentCircuitId = null;
+    private String agentRemoteId = null;
+
+    public DhcpOption82() {
+
+    }
+
+    public void setAgentCircuitId(String value) {
+        this.agentCircuitId = value;
+    }
+
+    /**
+     *
+     * @return agentCircuitId
+     */
+    public String getAgentCircuitId() {
+        return this.agentCircuitId;
+    }
+
+    /**
+     * sets AgentRemoteId.
+     * @param value
+     */
+    public void setAgentRemoteId(String value) {
+        this.agentRemoteId = value;
+    }
+
+    /**
+     *
+     * @return agentRemoteId
+     */
+    public String getAgentRemoteId() {
+        return this.agentRemoteId;
+    }
+
+    /**
+     *
+     * @return length of option 82.
+     */
+    public byte length() {
+        int length = 0;
+
+        // +2 below for sub option ID and length of sub option
+        if (agentCircuitId != null) {
+            length += agentCircuitId.length() + 2;
+        }
+        if (agentRemoteId != null) {
+            length += agentRemoteId.length() + 2;
+        }
+        return (byte) length;
+    }
+
+    /**
+     * Returns the representation of the option 82 specification as a byte
+     * array.
+     * @return returns byte array
+     */
+    public byte[] toByteArray() {
+        ByteArrayOutputStream buf = new ByteArrayOutputStream();
+
+        // Add sub option if set
+        if (agentCircuitId != null) {
+            buf.write((byte) 1);
+            buf.write((byte) agentCircuitId.length());
+            byte[] bytes = agentCircuitId.getBytes(StandardCharsets.UTF_8);
+            buf.write(bytes, 0, bytes.length);
+        }
+
+        // Add sub option if set
+        if (agentRemoteId != null) {
+            buf.write((byte) 2);
+            buf.write((byte) agentRemoteId.length());
+            byte[] bytes = agentRemoteId.getBytes(StandardCharsets.UTF_8);
+            buf.write(bytes, 0, bytes.length);
+        }
+
+        return buf.toByteArray();
+    }
+
+}