bharat saraswal | f7364db | 2015-08-11 13:39:31 +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.ver1;
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| 18 |
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| 19 | import java.util.LinkedList;
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| 20 | import java.util.ListIterator;
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| 21 |
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| 22 | import org.jboss.netty.buffer.ChannelBuffer;
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| 23 | import org.onosproject.pcepio.exceptions.PcepParseException;
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| 24 | import org.onosproject.pcepio.protocol.PcepSrpObject;
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| 25 | import org.onosproject.pcepio.types.PcepObjectHeader;
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| 26 | import org.onosproject.pcepio.types.PcepValueType;
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| 27 | import org.onosproject.pcepio.types.SymbolicPathNameTlv;
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| 28 | import org.slf4j.Logger;
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| 29 | import org.slf4j.LoggerFactory;
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| 30 |
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| 31 | import com.google.common.base.MoreObjects;
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| 32 |
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| 33 | public class PcepSrpObjectVer1 implements PcepSrpObject {
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| 34 |
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| 35 | /*
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| 36 | * ref : draft-ietf-pce-stateful-pce-10, section : 7.2
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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 | | Object-Class | OT |Res|P|I| Object Length (bytes) |
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| 41 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 42 | | Flags |R|
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| 43 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 44 | | SRP-ID-number |
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| 45 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 46 | | |
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| 47 | // Optional TLVs //
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| 48 | | |
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| 49 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| 50 |
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| 51 | */
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| 52 | protected static final Logger log = LoggerFactory.getLogger(PcepSrpObjectVer1.class);
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| 53 |
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| 54 | public static final byte SRP_OBJ_TYPE = 1;
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| 55 | public static final byte SRP_OBJ_CLASS = 33;
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| 56 | public static final byte SRP_OBJECT_VERSION = 1;
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| 57 | public static final short SRP_OBJ_MINIMUM_LENGTH = 12;
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| 58 | public static final int MINIMUM_COMMON_HEADER_LENGTH = 4;
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| 59 | public static final boolean DEFAULT_RFLAG = false;
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| 60 |
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| 61 | static final PcepObjectHeader DEFAULT_SRP_OBJECT_HEADER = new PcepObjectHeader(SRP_OBJ_CLASS, SRP_OBJ_TYPE,
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| 62 | PcepObjectHeader.REQ_OBJ_OPTIONAL_PROCESS, PcepObjectHeader.RSP_OBJ_PROCESSED, SRP_OBJ_MINIMUM_LENGTH);
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| 63 |
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| 64 | private PcepObjectHeader srpObjHeader;
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| 65 | private static int flags;
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| 66 | private boolean bRFlag;
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| 67 | private int srpId;
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| 68 |
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| 69 | //Optional TLV
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| 70 | private LinkedList<PcepValueType> llOptionalTlv;
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| 71 | public static final byte BBIT_SET = 1;
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| 72 | public static final byte BBIT_RESET = 0;
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| 73 |
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| 74 | /**
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| 75 | * Constructor to initialize member variables.
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| 76 | *
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| 77 | * @param srpObjHeader srp object header
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| 78 | * @param bRFlag R flag
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| 79 | * @param srpID srp Id
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| 80 | * @param llOptionalTlv list of optional tlv
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| 81 | */
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| 82 | public PcepSrpObjectVer1(PcepObjectHeader srpObjHeader, boolean bRFlag, int srpID,
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| 83 | LinkedList<PcepValueType> llOptionalTlv) {
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| 84 |
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| 85 | this.srpObjHeader = srpObjHeader;
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| 86 | this.bRFlag = bRFlag;
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| 87 | this.srpId = srpID;
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| 88 | this.llOptionalTlv = llOptionalTlv;
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * sets the SRP object header.
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| 93 | *
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| 94 | * @param obj srp object header
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| 95 | */
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| 96 | public void setSrpObjHeader(PcepObjectHeader obj) {
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| 97 | this.srpObjHeader = obj;
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| 98 | }
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| 99 |
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| 100 | @Override
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| 101 | public void setSrpID(int srpID) {
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| 102 | this.srpId = srpID;
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| 103 | }
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| 104 |
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| 105 | @Override
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| 106 | public void setRFlag(boolean bRFlag) {
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| 107 | this.bRFlag = bRFlag;
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| 108 | }
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| 109 |
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| 110 | /**
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| 111 | * Returns SRP object header.
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| 112 | *
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| 113 | * @return srpObjHeader
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| 114 | */
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| 115 | public PcepObjectHeader getSrpObjHeader() {
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| 116 | return this.srpObjHeader;
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| 117 | }
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| 118 |
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| 119 | @Override
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| 120 | public int getSrpID() {
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| 121 | return this.srpId;
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| 122 | }
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| 123 |
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| 124 | @Override
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| 125 | public boolean getRFlag() {
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| 126 | return this.bRFlag;
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| 127 | }
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| 128 |
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| 129 | @Override
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| 130 | public void setOptionalTlv(LinkedList<PcepValueType> llOptionalTlv) {
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| 131 | this.llOptionalTlv = llOptionalTlv;
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| 132 |
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| 133 | }
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| 134 |
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| 135 | @Override
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| 136 | public LinkedList<PcepValueType> getOptionalTlv() {
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| 137 | return this.llOptionalTlv;
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| 138 | }
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| 139 |
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| 140 | /**
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| 141 | * Reads from channel buffer and returns instance of PCEP SRP object.
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| 142 | *
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| 143 | * @param cb of channel buffer.
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| 144 | * @return PCEP SRP object
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| 145 | * @throws PcepParseException when srp object is not received in channel buffer
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| 146 | */
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| 147 | public static PcepSrpObject read(ChannelBuffer cb) throws PcepParseException {
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| 148 |
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| 149 | log.debug("SrpObject::read");
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| 150 | PcepObjectHeader srpObjHeader;
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| 151 | boolean bRFlag;
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| 152 |
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| 153 | int srpID;
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| 154 | int flags;
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| 155 | LinkedList<PcepValueType> llOptionalTlv = new LinkedList<PcepValueType>();
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| 156 |
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| 157 | srpObjHeader = PcepObjectHeader.read(cb);
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| 158 |
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| 159 | if (SRP_OBJ_CLASS != srpObjHeader.getObjClass()) {
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| 160 | throw new PcepParseException("SRP object expected. But received " + srpObjHeader.getObjClass());
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| 161 | }
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| 162 |
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| 163 | //take only SrpObject buffer.
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| 164 | ChannelBuffer tempCb = cb.readBytes(srpObjHeader.getObjLen() - MINIMUM_COMMON_HEADER_LENGTH);
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| 165 | flags = tempCb.readInt();
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| 166 | bRFlag = (0 < flags) ? true : false;
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| 167 | srpID = tempCb.readInt();
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| 168 |
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| 169 | llOptionalTlv = parseOptionalTlv(tempCb);
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| 170 |
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| 171 | return new PcepSrpObjectVer1(srpObjHeader, bRFlag, srpID, llOptionalTlv);
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| 172 | }
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| 173 |
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| 174 | @Override
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| 175 | public int write(ChannelBuffer cb) throws PcepParseException {
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| 176 |
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| 177 | int objStartIndex = cb.writerIndex();
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| 178 |
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| 179 | //write common header
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| 180 | int objLenIndex = srpObjHeader.write(cb);
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| 181 |
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| 182 | //write Flags
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| 183 | byte bFlag;
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| 184 |
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| 185 | bFlag = (bRFlag) ? BBIT_SET : BBIT_RESET;
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| 186 |
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| 187 | cb.writeInt(bFlag);
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| 188 |
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| 189 | //write SrpId
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| 190 | cb.writeInt(srpId);
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| 191 |
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| 192 | // Add optional TLV
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| 193 | if (!packOptionalTlv(cb)) {
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| 194 | throw new PcepParseException("Failed to write srp tlv to channel buffer.");
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| 195 | }
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| 196 |
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| 197 | //now write SRP Object Length
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| 198 | cb.setShort(objLenIndex, (short) (cb.writerIndex() - objStartIndex));
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| 199 |
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| 200 | return cb.writerIndex();
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| 201 | }
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| 202 |
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| 203 | /**
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| 204 | * Parse Optional TLvs from the channel buffer.
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| 205 | *
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| 206 | * @param cb of type channel buffer
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| 207 | * @return list of optional tlvs
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| 208 | * @throws PcepParseException when unsupported tlv is received in srp object
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| 209 | */
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| 210 | public static LinkedList<PcepValueType> parseOptionalTlv(ChannelBuffer cb) throws PcepParseException {
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| 211 |
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| 212 | LinkedList<PcepValueType> llOutOptionalTlv = new LinkedList<PcepValueType>();
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| 213 |
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| 214 | while (MINIMUM_COMMON_HEADER_LENGTH <= cb.readableBytes()) {
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| 215 |
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| 216 | PcepValueType tlv;
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| 217 | short hType = cb.readShort();
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| 218 | short hLength = cb.readShort();
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| 219 |
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| 220 | switch (hType) {
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| 221 |
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| 222 | case SymbolicPathNameTlv.TYPE:
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| 223 | tlv = SymbolicPathNameTlv.read(cb, hLength);
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| 224 | cb.skipBytes(hLength);
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| 225 | break;
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| 226 |
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| 227 | default:
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| 228 | throw new PcepParseException("Unsupported TLV received in SRP Object.");
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| 229 | }
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| 230 |
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| 231 | // Check for the padding
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| 232 | int pad = hLength % 4;
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| 233 | if (0 < pad) {
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| 234 | pad = 4 - pad;
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| 235 | if (pad <= cb.readableBytes()) {
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| 236 | cb.skipBytes(pad);
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| 237 | }
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| 238 | }
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| 239 | llOutOptionalTlv.add(tlv);
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| 240 | }
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| 241 |
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| 242 | return llOutOptionalTlv;
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| 243 | }
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| 244 |
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| 245 | /**
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| 246 | * Writes optional tlvs to channel buffer.
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| 247 | *
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| 248 | * @param cb of type channel buffer
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| 249 | * @return true if writing optional tlv to channel buffer is success.
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| 250 | */
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| 251 | protected boolean packOptionalTlv(ChannelBuffer cb) {
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| 252 |
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| 253 | ListIterator<PcepValueType> listIterator = llOptionalTlv.listIterator();
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| 254 |
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| 255 | while (listIterator.hasNext()) {
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| 256 | PcepValueType tlv = listIterator.next();
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| 257 |
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| 258 | if (null == tlv) {
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| 259 | log.debug("tlv is null from OptionalTlv list");
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| 260 | continue;
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| 261 | }
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| 262 | tlv.write(cb);
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| 263 |
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| 264 | // need to take care of padding
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| 265 | int pad = tlv.getLength() % 4;
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| 266 |
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| 267 | if (0 != pad) {
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| 268 | pad = 4 - pad;
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| 269 | for (int i = 0; i < pad; ++i) {
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| 270 | cb.writeByte((byte) 0);
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| 271 | }
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| 272 | }
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| 273 | }
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| 274 |
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| 275 | return true;
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| 276 | }
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| 277 |
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| 278 | /**
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| 279 | * builder class for PCEP srp Object.
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| 280 | */
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| 281 | public static class Builder implements PcepSrpObject.Builder {
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| 282 | private boolean bIsHeaderSet = false;
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| 283 | private boolean bIsSrpIdset = false;
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| 284 | private boolean bIsRFlagSet = false;
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| 285 |
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| 286 | private PcepObjectHeader srpObjHeader;
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| 287 | private int srpId;
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| 288 | private boolean bRFlag;
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| 289 | LinkedList<PcepValueType> llOptionalTlv = new LinkedList<PcepValueType>();
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| 290 |
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| 291 | private boolean bIsPFlagSet = false;
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| 292 | private boolean bPFlag;
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| 293 |
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| 294 | private boolean bIsIFlagSet = false;
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| 295 | private boolean bIFlag;
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| 296 |
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| 297 | @Override
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| 298 | public PcepSrpObject build() throws PcepParseException {
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| 299 | PcepObjectHeader srpObjHeader = this.bIsHeaderSet ? this.srpObjHeader : DEFAULT_SRP_OBJECT_HEADER;
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| 300 |
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| 301 | boolean bRFlag = this.bIsRFlagSet ? this.bRFlag : DEFAULT_RFLAG;
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| 302 |
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| 303 | if (!this.bIsSrpIdset) {
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| 304 | throw new PcepParseException("SrpID not set while building SRP Object.");
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| 305 | }
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| 306 |
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| 307 | if (bIsPFlagSet) {
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| 308 | srpObjHeader.setPFlag(bPFlag);
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| 309 | }
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| 310 |
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| 311 | if (bIsIFlagSet) {
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| 312 | srpObjHeader.setIFlag(bIFlag);
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| 313 | }
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| 314 |
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| 315 | return new PcepSrpObjectVer1(srpObjHeader, bRFlag, this.srpId, this.llOptionalTlv);
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| 316 | }
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| 317 |
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| 318 | @Override
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| 319 | public PcepObjectHeader getSrpObjHeader() {
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| 320 | return this.srpObjHeader;
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| 321 | }
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| 322 |
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| 323 | @Override
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| 324 | public Builder setSrpObjHeader(PcepObjectHeader obj) {
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| 325 | this.srpObjHeader = obj;
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| 326 | this.bIsHeaderSet = true;
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| 327 | return this;
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| 328 | }
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| 329 |
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| 330 | @Override
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| 331 | public int getSrpID() {
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| 332 | return this.srpId;
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| 333 | }
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| 334 |
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| 335 | @Override
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| 336 | public Builder setSrpID(int srpID) {
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| 337 | this.srpId = srpID;
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| 338 | this.bIsSrpIdset = true;
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| 339 | return this;
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| 340 | }
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| 341 |
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| 342 | @Override
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| 343 | public boolean getRFlag() {
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| 344 | return this.bRFlag;
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| 345 | }
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| 346 |
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| 347 | @Override
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| 348 | public Builder setRFlag(boolean bRFlag) {
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| 349 | this.bRFlag = bRFlag;
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| 350 | this.bIsRFlagSet = true;
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| 351 | return this;
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| 352 | }
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| 353 |
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| 354 | @Override
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| 355 | public Builder setOptionalTlv(LinkedList<PcepValueType> llOptionalTlv) {
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| 356 | this.llOptionalTlv = llOptionalTlv;
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| 357 | return this;
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| 358 | }
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| 359 |
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| 360 | @Override
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| 361 | public LinkedList<PcepValueType> getOptionalTlv() {
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| 362 | return this.llOptionalTlv;
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| 363 | }
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| 364 |
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| 365 | @Override
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| 366 | public Builder setPFlag(boolean value) {
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| 367 | this.bPFlag = value;
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| 368 | this.bIsPFlagSet = true;
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| 369 | return this;
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| 370 | }
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| 371 |
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| 372 | @Override
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| 373 | public Builder setIFlag(boolean value) {
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| 374 | this.bIFlag = value;
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| 375 | this.bIsIFlagSet = true;
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| 376 | return this;
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| 377 | }
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| 378 |
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| 379 | }
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| 380 |
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| 381 | @Override
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| 382 | public void print() {
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| 383 |
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| 384 | log.debug("SRP OBJECT");
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| 385 | long lTemp = (bRFlag) ? 1 : 0;
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| 386 | log.debug("r Flag: " + lTemp);
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| 387 | log.debug("SrpID: " + srpId);
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| 388 |
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| 389 | log.debug("OPTIONAL TLV");
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| 390 | ListIterator<PcepValueType> listIterator = llOptionalTlv.listIterator();
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| 391 | while (listIterator.hasNext()) {
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| 392 | listIterator.next().print();
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| 393 | }
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| 394 | }
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| 395 | @Override
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| 396 | public String toString() {
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| 397 | return MoreObjects.toStringHelper(getClass())
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| 398 | .add("R flag", bRFlag)
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| 399 | .add("SRP ID", srpId)
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| 400 | .add("Optional tlv list", llOptionalTlv)
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| 401 | .toString();
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| 402 | }
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| 403 | }
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