| /* |
| * Copyright 2016-present 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.lisp.msg.protocols; |
| |
| import io.netty.buffer.ByteBuf; |
| import org.onlab.util.ByteOperator; |
| import org.onosproject.lisp.msg.protocols.DefaultLispEncapsulatedControl.EcmReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispInfoReply.InfoReplyReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispInfoRequest.InfoRequestReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispMapNotify.NotifyReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispMapRegister.RegisterReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispMapReply.ReplyReader; |
| import org.onosproject.lisp.msg.protocols.DefaultLispMapRequest.RequestReader; |
| |
| /** |
| * A factory class which helps to instantiate LISP reader class. |
| */ |
| public final class LispMessageReaderFactory { |
| private static final int TYPE_SHIFT_BIT = 4; |
| private static final int INFO_REPLY_INDEX = 3; |
| |
| private LispMessageReaderFactory() {} |
| |
| /** |
| * Obtains corresponding LISP message reader. |
| * |
| * @param buffer netty byte buffer |
| * @return LISP message reader |
| */ |
| public static LispMessageReader getReader(ByteBuf buffer) { |
| LispMessageReader reader; |
| |
| LispType type = LispType.valueOf( |
| (short) (buffer.getUnsignedByte(0) >> TYPE_SHIFT_BIT)); |
| |
| switch (type) { |
| case LISP_MAP_REQUEST: |
| reader = new RequestReader(); |
| break; |
| case LISP_MAP_REPLY: |
| reader = new ReplyReader(); |
| break; |
| case LISP_MAP_REGISTER: |
| reader = new RegisterReader(); |
| break; |
| case LISP_MAP_NOTIFY: |
| reader = new NotifyReader(); |
| break; |
| case LISP_INFO: |
| boolean isInfoReply = ByteOperator.getBit( |
| (byte) buffer.getUnsignedByte(0), INFO_REPLY_INDEX); |
| if (isInfoReply) { |
| reader = new InfoReplyReader(); |
| } else { |
| reader = new InfoRequestReader(); |
| } |
| break; |
| case LISP_ENCAPSULATED_CONTROL: |
| reader = new EcmReader(); |
| break; |
| case UNKNOWN: |
| throw new IllegalArgumentException("Unknown message type: " |
| + type); |
| default: |
| throw new IllegalArgumentException("Undefined message type: " |
| + type); |
| } |
| return reader; |
| } |
| } |