Mahesh Poojary S | 5afd06c | 2015-08-21 14:51:04 +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 | package org.onosproject.pcepio.types;
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| 17 |
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| 18 | import java.util.Iterator;
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| 19 | import java.util.LinkedList;
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| 20 | import java.util.ListIterator;
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| 21 | import java.util.Objects;
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| 22 |
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| 23 | import org.jboss.netty.buffer.ChannelBuffer;
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| 24 | import org.onosproject.pcepio.exceptions.PcepParseException;
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| 25 | import org.onosproject.pcepio.protocol.PcepVersion;
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| 26 | import org.slf4j.Logger;
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| 27 | import org.slf4j.LoggerFactory;
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| 28 |
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| 29 | import com.google.common.base.MoreObjects;
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| 30 |
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| 31 | /**
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| 32 | * Provides Local TE Node Descriptors TLV which contains Node Descriptor Sub-TLVs.
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| 33 | */
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| 34 | public class LocalTENodeDescriptorsTLV implements PcepValueType {
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| 35 |
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| 36 | /* REFERENCE :draft-ietf-idr-ls-distribution-10
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| 37 | * 0 1 2 3
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| 38 | 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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| 39 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 40 | | Type=[TBD8] | Length |
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| 41 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 42 | | |
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| 43 | // Node Descriptor Sub-TLVs (variable) //
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| 44 | | |
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| 45 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 46 | Note: Length is including header here. Refer Routing Universe TLV.
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| 47 | */
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| 48 |
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| 49 | protected static final Logger log = LoggerFactory.getLogger(LocalTENodeDescriptorsTLV.class);
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| 50 |
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| 51 | public static final short TYPE = 1637; //TODD:change this TBD8
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| 52 | public short hLength;
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| 53 |
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| 54 | public static final int TLV_HEADER_LENGTH = 4;
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| 55 | // Node Descriptor Sub-TLVs (variable)
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| 56 | private LinkedList<PcepValueType> llNodeDescriptorSubTLVs;
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| 57 |
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| 58 | /**
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| 59 | * Constructor to initialize llNodeDescriptorSubTLVs.
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| 60 | *
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| 61 | * @param llNodeDescriptorSubTLVs LinkedList of PcepValueType
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| 62 | */
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| 63 | public LocalTENodeDescriptorsTLV(LinkedList<PcepValueType> llNodeDescriptorSubTLVs) {
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| 64 | this.llNodeDescriptorSubTLVs = llNodeDescriptorSubTLVs;
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| 65 | }
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| 66 |
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| 67 | /**
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| 68 | * Returns a new object of LocalTENodeDescriptorsTLV.
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| 69 | *
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| 70 | * @param llNodeDescriptorSubTLVs linked list of Node Descriptor Sub TLVs
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| 71 | * @return object of LocalTENodeDescriptorsTLV
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| 72 | */
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| 73 | public static LocalTENodeDescriptorsTLV of(final LinkedList<PcepValueType> llNodeDescriptorSubTLVs) {
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| 74 | return new LocalTENodeDescriptorsTLV(llNodeDescriptorSubTLVs);
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| 75 | }
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| 76 |
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| 77 | /**
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| 78 | * Returns Linked List of tlvs.
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| 79 | *
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| 80 | * @return llNodeDescriptorSubTLVs linked list of Node Descriptor Sub TLV
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| 81 | */
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| 82 | public LinkedList<PcepValueType> getllNodeDescriptorSubTLVs() {
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| 83 | return llNodeDescriptorSubTLVs;
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| 84 | }
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| 85 |
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| 86 | @Override
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| 87 | public PcepVersion getVersion() {
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| 88 | return PcepVersion.PCEP_1;
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| 89 | }
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| 90 |
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| 91 | @Override
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| 92 | public short getType() {
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| 93 | return TYPE;
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| 94 | }
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| 95 |
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| 96 | @Override
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| 97 | public short getLength() {
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| 98 | return hLength;
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| 99 | }
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| 100 |
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| 101 | @Override
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| 102 | public int hashCode() {
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| 103 | return Objects.hash(llNodeDescriptorSubTLVs.hashCode());
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| 104 | }
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| 105 |
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| 106 | @Override
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| 107 | public boolean equals(Object obj) {
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| 108 | if (this == obj) {
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| 109 | return true;
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| 110 | }
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| 111 |
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| 112 | /*
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| 113 | * Here we have a list of Tlv so to compare each sub tlv between the object
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| 114 | * we have to take a list iterator so one by one we can get each sub tlv object
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| 115 | * and can compare them.
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| 116 | * it may be possible that the size of 2 lists is not equal so we have to first check
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| 117 | * the size, if both are same then we should check for the subtlv objects otherwise
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| 118 | * we should return false.
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| 119 | */
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| 120 | if (obj instanceof LocalTENodeDescriptorsTLV) {
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| 121 | int countObjSubTlv = 0;
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| 122 | int countOtherSubTlv = 0;
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| 123 | boolean isCommonSubTlv = true;
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| 124 | LocalTENodeDescriptorsTLV other = (LocalTENodeDescriptorsTLV) obj;
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| 125 | Iterator<PcepValueType> objListIterator = ((LocalTENodeDescriptorsTLV) obj).llNodeDescriptorSubTLVs
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| 126 | .iterator();
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| 127 | countObjSubTlv = ((LocalTENodeDescriptorsTLV) obj).llNodeDescriptorSubTLVs.size();
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| 128 | countOtherSubTlv = other.llNodeDescriptorSubTLVs.size();
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| 129 | if (countObjSubTlv != countOtherSubTlv) {
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| 130 | return false;
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| 131 | } else {
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| 132 | while (objListIterator.hasNext() && isCommonSubTlv) {
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| 133 | PcepValueType subTlv = objListIterator.next();
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| 134 | isCommonSubTlv = Objects.equals(llNodeDescriptorSubTLVs.contains(subTlv),
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| 135 | other.llNodeDescriptorSubTLVs.contains(subTlv));
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| 136 | }
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| 137 | return isCommonSubTlv;
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| 138 | }
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| 139 | }
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| 140 | return false;
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| 141 | }
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| 142 |
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| 143 | @Override
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| 144 | public int write(ChannelBuffer c) {
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| 145 | int tlvStartIndex = c.writerIndex();
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| 146 | c.writeShort(TYPE);
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| 147 | int tlvLenIndex = c.writerIndex();
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| 148 | hLength = 0;
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| 149 | c.writeShort(0);
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| 150 |
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| 151 | ListIterator<PcepValueType> listIterator = llNodeDescriptorSubTLVs.listIterator();
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| 152 |
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| 153 | while (listIterator.hasNext()) {
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| 154 | PcepValueType tlv = listIterator.next();
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| 155 | if (null == tlv) {
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| 156 | log.debug("TLV is null from subTlv list");
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| 157 | continue;
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| 158 | }
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| 159 | tlv.write(c);
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| 160 |
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| 161 | // need to take care of padding
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| 162 | int pad = tlv.getLength() % 4;
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| 163 |
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| 164 | if (0 != pad) {
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| 165 | pad = 4 - pad;
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| 166 | for (int i = 0; i < pad; ++i) {
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| 167 | c.writeByte((byte) 0);
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 | hLength = (short) (c.writerIndex() - tlvStartIndex);
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| 172 | c.setShort(tlvLenIndex, hLength);
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| 173 | return c.writerIndex() - tlvStartIndex;
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| 174 | }
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| 175 |
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| 176 | /**
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| 177 | * Reads the channel buffer and returns object of AutonomousSystemTlv.
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| 178 | *
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| 179 | * @param c input channel buffer
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| 180 | * @param hLength length of subtlvs.
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| 181 | * @return object of AutonomousSystemTlv
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| 182 | * @throws PcepParseException if mandatory fields are missing
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| 183 | */
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| 184 | public static PcepValueType read(ChannelBuffer c, short hLength) throws PcepParseException {
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| 185 |
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| 186 | // Node Descriptor Sub-TLVs (variable)
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| 187 | LinkedList<PcepValueType> llNodeDescriptorSubTLVs = new LinkedList<PcepValueType>();
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| 188 |
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| 189 | ChannelBuffer tempCb = c.readBytes(hLength - TLV_HEADER_LENGTH);
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| 190 |
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| 191 | while (TLV_HEADER_LENGTH <= tempCb.readableBytes()) {
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| 192 |
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| 193 | PcepValueType tlv;
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| 194 | short hType = tempCb.readShort();
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| 195 | int iValue = 0;
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| 196 | short length = tempCb.readShort();
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| 197 |
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| 198 | switch (hType) {
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| 199 |
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| 200 | case AutonomousSystemTlv.TYPE:
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| 201 | iValue = tempCb.readInt();
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| 202 | tlv = new AutonomousSystemTlv(iValue);
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| 203 | break;
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| 204 | case BGPLSidentifierTlv.TYPE:
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| 205 | iValue = tempCb.readInt();
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| 206 | tlv = new BGPLSidentifierTlv(iValue);
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| 207 | break;
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| 208 | case OSPFareaIDsubTlv.TYPE:
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| 209 | iValue = tempCb.readInt();
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| 210 | tlv = new OSPFareaIDsubTlv(iValue);
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| 211 | break;
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| 212 | case RouterIDSubTlv.TYPE:
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| 213 | tlv = RouterIDSubTlv.read(tempCb, length);
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| 214 | break;
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| 215 |
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| 216 | default:
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| 217 | throw new PcepParseException("Unsupported Sub TLV type :" + hType);
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| 218 | }
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| 219 |
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| 220 | // Check for the padding
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| 221 | int pad = length % 4;
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| 222 | if (0 < pad) {
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| 223 | pad = 4 - pad;
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| 224 | if (pad <= tempCb.readableBytes()) {
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| 225 | tempCb.skipBytes(pad);
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| 226 | }
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| 227 | }
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| 228 |
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| 229 | llNodeDescriptorSubTLVs.add(tlv);
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| 230 | }
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| 231 |
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| 232 | if (0 < tempCb.readableBytes()) {
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| 233 | throw new PcepParseException("Sub Tlv parsing error. Extra bytes received.");
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| 234 | }
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| 235 | return new LocalTENodeDescriptorsTLV(llNodeDescriptorSubTLVs);
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| 236 | }
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| 237 |
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| 238 | @Override
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| 239 | public String toString() {
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| 240 | return MoreObjects.toStringHelper(getClass()).add("Type", TYPE).add("Length", hLength)
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| 241 | .add("NodeDescriptorSubTLVs", llNodeDescriptorSubTLVs).toString();
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| 242 | }
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| 243 | }
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