ONOS checkin based on commit tag e796610b1f721d02f9b0e213cf6f7790c10ecd60

Change-Id: Ife8810491034fe7becdba75dda20de4267bd15cd

1 files changed, 86 insertions, 0 deletions

diff --git a/framework/src/onos/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpMessage.java b/framework/src/onos/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpMessage.java
new file mode 100644
index 00000000..e93362e5
--- /dev/null
+++ b/framework/src/onos/apps/routing/src/main/java/org/onosproject/routing/bgp/BgpMessage.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2014-2015 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);
+        }
+    }
+}