2 * Copyright (c) 2013 Pantheon Technologies s.r.o. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.openflowjava.protocol.impl.deserialization.factories;
11 import io.netty.buffer.ByteBuf;
13 import java.util.ArrayList;
14 import java.util.List;
16 import org.opendaylight.openflowjava.protocol.impl.deserialization.OFDeserializer;
17 import org.opendaylight.openflowjava.protocol.impl.util.EncodeConstants;
18 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.HelloElementType;
19 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloMessage;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.HelloMessageBuilder;
21 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.hello.Elements;
22 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.hello.ElementsBuilder;
25 * Translates Hello messages
26 * @author michal.polkorab
27 * @author timotej.kubas
29 public class HelloMessageFactory implements OFDeserializer<HelloMessage> {
31 private static HelloMessageFactory instance;
32 private static final byte HELLO_ELEMENT_HEADER_SIZE = 4;
34 private HelloMessageFactory() {
35 // do nothing, just singleton
39 * @return singleton factory
41 public static synchronized HelloMessageFactory getInstance() {
42 if (instance == null) {
43 instance = new HelloMessageFactory();
49 public HelloMessage bufferToMessage(ByteBuf rawMessage, short version) {
50 HelloMessageBuilder builder = new HelloMessageBuilder();
51 builder.setVersion(version);
52 builder.setXid(rawMessage.readUnsignedInt());
53 if (rawMessage.readableBytes() > 0) {
54 builder.setElements(readElement(rawMessage));
56 return builder.build();
59 private static List<Elements> readElement(ByteBuf input) {
60 List<Elements> elementsList = new ArrayList<>();
61 while (input.readableBytes() > 0) {
62 ElementsBuilder elementsBuilder = new ElementsBuilder();
63 int type = input.readUnsignedShort();
64 int elementLength = input.readUnsignedShort();
65 if (type == HelloElementType.VERSIONBITMAP.getIntValue()) {
66 elementsBuilder.setType(HelloElementType.forValue(type));
67 int[] versionBitmap = new int[(elementLength - HELLO_ELEMENT_HEADER_SIZE) / 4];
68 for (int i = 0; i < versionBitmap.length; i++) {
69 versionBitmap[i] = (int) input.readUnsignedInt();
71 elementsBuilder.setVersionBitmap(readVersionBitmap(versionBitmap));
72 int paddingRemainder = elementLength % EncodeConstants.PADDING;
73 if (paddingRemainder != 0) {
74 input.readBytes(EncodeConstants.PADDING - paddingRemainder);
77 elementsList.add(elementsBuilder.build());
82 private static List<Boolean> readVersionBitmap(int[] input){
83 List<Boolean> versionBitmapList = new ArrayList<>();
84 for (int i = 0; i < input.length; i++) {
86 for (int j = 0; j < Integer.SIZE; j++) {
87 versionBitmapList.add((mask & (1<<j)) != 0);
90 return versionBitmapList;