Madan Jampani | c27b6b2 | 2016-02-05 11:36:31 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.bgpio.protocol; |
| 18 | |
| 19 | import org.jboss.netty.buffer.ChannelBuffer; |
| 20 | import org.onosproject.bgpio.exceptions.BgpParseException; |
| 21 | import org.onosproject.bgpio.protocol.ver4.BgpFactoryVer4; |
| 22 | import org.onosproject.bgpio.types.BgpHeader; |
| 23 | import org.slf4j.Logger; |
| 24 | import org.slf4j.LoggerFactory; |
| 25 | |
| 26 | /** |
| 27 | * Abstraction to provide the version for BGP. |
| 28 | */ |
| 29 | public final class BgpFactories { |
| 30 | |
| 31 | protected static final Logger log = LoggerFactory.getLogger(BgpFactories.class); |
| 32 | |
| 33 | private static final GenericReader GENERIC_READER = new GenericReader(); |
| 34 | |
| 35 | private BgpFactories() { |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Returns the instance of BGP Version. |
| 40 | * |
| 41 | * @param version BGP version |
| 42 | * @return BGP version |
| 43 | */ |
| 44 | public static BgpFactory getFactory(BgpVersion version) { |
| 45 | switch (version) { |
| 46 | case BGP_4: |
| 47 | return BgpFactoryVer4.INSTANCE; |
| 48 | default: |
| 49 | throw new IllegalArgumentException("[BgpFactory:]Unknown version: " + version); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Reader class for reading BGP messages from channel buffer. |
| 55 | * |
| 56 | */ |
| 57 | private static class GenericReader implements BgpMessageReader<BgpMessage> { |
| 58 | |
| 59 | @Override |
| 60 | public BgpMessage readFrom(ChannelBuffer bb, BgpHeader bgpHeader) |
| 61 | throws BgpParseException { |
| 62 | BgpFactory factory; |
| 63 | |
| 64 | if (!bb.readable()) { |
| 65 | log.error("Empty message received"); |
| 66 | throw new BgpParseException("Empty message received"); |
| 67 | } |
| 68 | // TODO: Currently only BGP version 4 is supported |
| 69 | factory = org.onosproject.bgpio.protocol.ver4.BgpFactoryVer4.INSTANCE; |
| 70 | return factory.getReader().readFrom(bb, bgpHeader); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Returns BGP messsage generic reader. |
| 76 | * |
| 77 | * @return bgp message generic reader |
| 78 | */ |
| 79 | public static BgpMessageReader<BgpMessage> getGenericReader() { |
| 80 | return GENERIC_READER; |
| 81 | } |
| 82 | } |