| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * 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.onosproject.routing.bgp; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.jboss.netty.buffer.ChannelBuffers; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A class for preparing BGP messages. |
| */ |
| final class BgpMessage { |
| private static final Logger log = |
| LoggerFactory.getLogger(BgpMessage.class); |
| |
| /** |
| * Default constructor. |
| * <p> |
| * The constructor is private to prevent creating an instance of |
| * this utility class. |
| */ |
| private BgpMessage() { |
| } |
| |
| /** |
| * Prepares BGP message. |
| * |
| * @param type the BGP message type |
| * @param payload the message payload to transmit (BGP header excluded) |
| * @return the message to transmit (BGP header included) |
| */ |
| static ChannelBuffer prepareBgpMessage(int type, ChannelBuffer payload) { |
| ChannelBuffer message = |
| ChannelBuffers.buffer(BgpConstants.BGP_HEADER_LENGTH + |
| payload.readableBytes()); |
| |
| // Write the marker |
| for (int i = 0; i < BgpConstants.BGP_HEADER_MARKER_LENGTH; i++) { |
| message.writeByte(0xff); |
| } |
| |
| // Write the rest of the BGP header |
| message.writeShort(BgpConstants.BGP_HEADER_LENGTH + |
| payload.readableBytes()); |
| message.writeByte(type); |
| |
| // Write the payload |
| message.writeBytes(payload); |
| return message; |
| } |
| |
| /** |
| * An exception indicating a parsing error of the BGP message. |
| */ |
| static final class BgpParseException extends Exception { |
| /** |
| * Default constructor. |
| */ |
| private BgpParseException() { |
| super(); |
| } |
| |
| /** |
| * Constructor for a specific exception details message. |
| * |
| * @param message the message with the exception details |
| */ |
| BgpParseException(String message) { |
| super(message); |
| } |
| } |
| } |