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.util;
11 import io.netty.buffer.ByteBuf;
12 import io.netty.buffer.UnpooledByteBufAllocator;
14 import java.lang.reflect.InvocationTargetException;
15 import java.lang.reflect.Method;
17 import org.junit.Assert;
18 import org.opendaylight.openflowjava.protocol.api.extensibility.OFDeserializer;
19 import org.opendaylight.openflowjava.protocol.api.util.EncodeConstants;
20 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
21 import org.opendaylight.yangtools.yang.binding.DataObject;
24 * @author michal.polkorab
27 public abstract class BufferHelper {
32 public static final Long DEFAULT_XID = 0x01020304L;
33 private static final byte[] XID = new byte[] { 0x01, 0x02, 0x03, 0x04 };
37 * @return ByteBuf filled with OpenFlow protocol message without first 4
40 public static ByteBuf buildBuffer(byte[] payload) {
41 ByteBuf bb = UnpooledByteBufAllocator.DEFAULT.buffer();
43 bb.writeBytes(payload);
48 * @param payload String in hex format
49 * @return ByteBuf filled with OpenFlow protocol message without first 4
52 public static ByteBuf buildBuffer(String payload) {
53 return buildBuffer(ByteBufUtils.hexStringToBytes(payload));
57 * @return ByteBuf filled with OpenFlow protocol header message without first 4
60 public static ByteBuf buildBuffer() {
61 ByteBuf bb = UnpooledByteBufAllocator.DEFAULT.buffer();
63 bb.writeBytes(new byte[0]);
68 * Use version 1.3 for encoded message
69 * @param input ByteBuf to be checked for correct OpenFlow Protocol header
70 * @param msgType type of received message
71 * @param length expected length of message in header
73 public static void checkHeaderV13(ByteBuf input, byte msgType, int length) {
74 checkHeader(input, msgType, length, (short) EncodeConstants.OF13_VERSION_ID);
78 * Use version 1.0 for encoded message
79 * @param input ByteBuf to be checked for correct OpenFlow Protocol header
80 * @param msgType type of received message
81 * @param length expected length of message in header
83 public static void checkHeaderV10(ByteBuf input, byte msgType, int length) {
84 checkHeader(input, msgType, length, (short) EncodeConstants.OF10_VERSION_ID);
87 private static void checkHeader(ByteBuf input, byte msgType, int length, Short version) {
88 Assert.assertEquals("Wrong version", version, Short.valueOf(input.readByte()));
89 Assert.assertEquals("Wrong type", msgType, input.readByte());
90 Assert.assertEquals("Wrong length", length, input.readUnsignedShort());
91 Assert.assertEquals("Wrong Xid", DEFAULT_XID, Long.valueOf(input.readUnsignedInt()));
96 * @param ofHeader OpenFlow protocol header
98 public static void checkHeaderV13(OfHeader ofHeader) {
99 checkHeader(ofHeader, (short) EncodeConstants.OF13_VERSION_ID);
103 * @param ofHeader OpenFlow protocol header
105 public static void checkHeaderV10(OfHeader ofHeader) {
106 checkHeader(ofHeader, (short) EncodeConstants.OF10_VERSION_ID);
109 private static void checkHeader(OfHeader ofHeader, Short version) {
110 Assert.assertEquals("Wrong version", version, ofHeader.getVersion());
111 Assert.assertEquals("Wrong Xid", DEFAULT_XID, ofHeader.getXid());
116 * @param version wire protocol number used
117 * @throws NoSuchMethodException
118 * @throws SecurityException
119 * @throws IllegalAccessException
120 * @throws IllegalArgumentException
121 * @throws InvocationTargetException
123 public static void setupHeader(Object builder, int version) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
124 Method m = builder.getClass().getMethod("setVersion", Short.class);
125 m.invoke(builder, (short) version);
126 Method m2 = builder.getClass().getMethod("setXid", Long.class);
127 m2.invoke(builder, BufferHelper.DEFAULT_XID);
132 * @param decoder decoder instance
133 * @param bb data input buffer
134 * @return message decoded pojo
136 public static <E extends DataObject> E deserialize(OFDeserializer<E> decoder, ByteBuf bb) {
137 return decoder.deserialize(bb);