| Phaneendra Manda | 1c0061d | 2015-08-06 12:29:38 +0530 | [diff] [blame^] | 1 | /*
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| 2 | * Copyright 2015 Open Networking Laboratory
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 |
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| 17 | package org.onosproject.pcepio.protocol;
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| 18 |
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| 19 | import org.jboss.netty.buffer.ChannelBuffer;
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| 20 | import org.onosproject.pcepio.exceptions.PcepParseException;
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| 21 | import org.slf4j.Logger;
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| 22 | import org.slf4j.LoggerFactory;
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| 23 |
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| 24 | public final class PcepFactories {
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| 25 |
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| 26 | protected static final Logger log = LoggerFactory.getLogger(PcepFactories.class);
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| 27 |
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| 28 | private static final GenericReader GENERIC_READER = new GenericReader();
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| 29 |
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| 30 | public static final byte SHIFT_FLAG = 5;
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| 31 |
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| 32 | private PcepFactories() {
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| 33 | }
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| 34 |
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| 35 | /*
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| 36 | * Returns the instance of PCEP Version.
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| 37 | *
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| 38 | * @param version
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| 39 | * @return PCEP version
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| 40 | */
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| 41 | public static PcepFactory getFactory(PcepVersion version) {
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| 42 | switch (version) {
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| 43 | case PCEP_1:
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| 44 | // TODO : to get the pcep version 1 factory
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| 45 | default:
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| 46 | throw new IllegalArgumentException("[PcepFactory:]Unknown version: " + version);
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | private static class GenericReader implements PcepMessageReader<PcepMessage> {
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| 51 |
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| 52 | @Override
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| 53 | public PcepMessage readFrom(ChannelBuffer bb) throws PcepParseException {
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| 54 |
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| 55 | if (!bb.readable()) {
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| 56 | log.debug("Empty message received");
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| 57 | throw new PcepParseException("Empty message received");
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| 58 | }
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| 59 |
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| 60 | /*
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| 61 | * 0 1 2 3
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| 62 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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| 63 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 64 | * | Ver | Flags | |
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| 65 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 66 | *
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| 67 | * Currently Version 1 is supported
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| 68 | * Currently no flags are used, it is all ignored
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| 69 | */
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| 70 |
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| 71 | byte packetVersion = bb.getByte(bb.readerIndex());
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| 72 | packetVersion = (byte) (packetVersion >> SHIFT_FLAG);
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| 73 | PcepFactory factory;
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| 74 |
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| 75 | switch (packetVersion) {
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| 76 |
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| 77 | case 1:
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| 78 | // TODO : get the factory for version 1
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| 79 | break;
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| 80 | default:
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| 81 | throw new IllegalArgumentException("Unknown Packet version: " + packetVersion);
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| 82 | }
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| 83 | // TODO : Read the PCEP message from the factory
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| 84 | return null;
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| 85 | }
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| 86 | }
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| 87 |
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| 88 | /*
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| 89 | * Returns GENERIC_READER.
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| 90 | *
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| 91 | * @return GENERIC_READER
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| 92 | */
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| 93 | public static PcepMessageReader<PcepMessage> getGenericReader() {
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| 94 | return GENERIC_READER;
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| 95 | }
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| 96 | }
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