Implement packet seriailizer and deserializer for LACP
Change-Id: Idbbd87a3ddeb477cac49a65e6a5c768761019e11
diff --git a/utils/misc/src/main/java/org/onlab/packet/Slow.java b/utils/misc/src/main/java/org/onlab/packet/Slow.java
new file mode 100644
index 0000000..ded5185
--- /dev/null
+++ b/utils/misc/src/main/java/org/onlab/packet/Slow.java
@@ -0,0 +1,144 @@
+/*
+ * 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.onlab.packet;
+
+import com.google.common.collect.ImmutableMap;
+import org.onlab.packet.lacp.Lacp;
+
+import java.nio.ByteBuffer;
+import java.util.Map;
+import java.util.Objects;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static org.onlab.packet.PacketUtils.checkInput;
+
+/**
+ * Implements ethernet slow protocols.
+ */
+public class Slow extends BasePacket {
+ public static final int HEADER_LENGTH = 1;
+
+ public static final byte SUBTYPE_LACP = 0x1;
+ // Subtypes below has not been implemented yet
+ // public static final byte SUBTYPE_LAMP = 0x2;
+ // public static final byte SUBTYPE_OAM = 0x3;
+ // public static final byte SUBTYPE_OSSP = 0xa;
+
+ public static final Map<Byte, Deserializer<? extends IPacket>> PROTOCOL_DESERIALIZER_MAP =
+ ImmutableMap.<Byte, Deserializer<? extends IPacket>>builder()
+ .put(Slow.SUBTYPE_LACP, Lacp.deserializer())
+ .build();
+
+ private byte subtype;
+
+ /**
+ * Gets subtype.
+ *
+ * @return subtype
+ */
+ public byte getSubtype() {
+ return subtype;
+ }
+
+ /**
+ * Sets subtype.
+ *
+ * @param subtype the subtype to set
+ * @return this
+ */
+ public Slow setSubtype(byte subtype) {
+ this.subtype = subtype;
+ return this;
+ }
+
+ /**
+ * Deserializer function for Slow packets.
+ *
+ * @return deserializer function
+ */
+ public static Deserializer<Slow> deserializer() {
+ return (data, offset, length) -> {
+ checkInput(data, offset, length, HEADER_LENGTH);
+
+ Slow slow = new Slow();
+ ByteBuffer bb = ByteBuffer.wrap(data, offset, length);
+ slow.setSubtype(bb.get());
+
+ Deserializer<? extends IPacket> deserializer;
+ if (Slow.PROTOCOL_DESERIALIZER_MAP.containsKey(slow.subtype)) {
+ deserializer = Slow.PROTOCOL_DESERIALIZER_MAP.get(slow.subtype);
+ } else {
+ throw new DeserializationException("Unsupported slow protocol subtype " + Byte.toString(slow.subtype));
+ }
+
+ int remainingLength = bb.limit() - bb.position();
+ slow.payload = deserializer.deserialize(data, bb.position(), remainingLength);
+ slow.payload.setParent(slow);
+
+ return slow;
+ };
+ }
+
+ @Override
+ public byte[] serialize() {
+ int length = HEADER_LENGTH;
+ byte[] payloadData = null;
+ if (this.payload != null) {
+ this.payload.setParent(this);
+ payloadData = this.payload.serialize();
+ length += payloadData.length;
+ }
+
+ final byte[] data = new byte[length];
+
+ final ByteBuffer bb = ByteBuffer.wrap(data);
+ bb.put(this.subtype);
+ if (payloadData != null) {
+ bb.put(payloadData);
+ }
+
+ return data;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(super.hashCode(), subtype);
+ }
+
+ @Override
+ public boolean equals(final Object obj) {
+ if (this == obj) {
+ return true;
+ }
+ if (!super.equals(obj)) {
+ return false;
+ }
+ if (!(obj instanceof Slow)) {
+ return false;
+ }
+ final Slow other = (Slow) obj;
+
+ return this.subtype == other.subtype;
+ }
+
+ @Override
+ public String toString() {
+ return toStringHelper(getClass())
+ .add("subtype", Byte.toString(subtype))
+ .toString();
+ }
+}