Bharat saraswal | f1a52b8 | 2015-08-21 16:34:20 +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.PcepLabelRange;
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| 25 | import org.onosproject.pcepio.protocol.PcepLabelRangeObject;
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| 26 | import org.onosproject.pcepio.protocol.PcepSrpObject;
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| 27 | import org.slf4j.Logger;
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| 28 | import org.slf4j.LoggerFactory;
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| 29 |
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| 30 | import com.google.common.base.MoreObjects;
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| 31 |
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| 32 | /**
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| 33 | * Provides PCEP Label Range.
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| 34 | */
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| 35 | public class PcepLabelRangeVer1 implements PcepLabelRange {
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| 36 |
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| 37 | protected static final Logger log = LoggerFactory.getLogger(PcepLabelRangeVer1.class);
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| 38 |
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| 39 | /*
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| 40 | <label-range> ::= <SRP>
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| 41 | <labelrange-list>
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| 42 | Where
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| 43 | <labelrange-list>::=<LABEL-RANGE>[<labelrange-list>]
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| 44 | */
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| 45 |
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| 46 | // PCEP SRP Object
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| 47 | private PcepSrpObject srpObject;
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| 48 | //<labelrange-list> of type PcepLabelRangeObject.
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| 49 | private LinkedList<PcepLabelRangeObject> llLabelRangeList;
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| 50 |
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| 51 | /**
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| 52 | * Default Constructor.
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| 53 | */
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| 54 | public PcepLabelRangeVer1() {
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| 55 | srpObject = null;
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| 56 | llLabelRangeList = null;
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| 57 | }
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| 58 |
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| 59 | /**
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| 60 | * Constructor to initialize objects.
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| 61 | *
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| 62 | * @param srpObj PCEP Srp object.
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| 63 | * @param llLabelRangeList list of PcepLabelRangeObject.
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| 64 | */
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| 65 | PcepLabelRangeVer1(PcepSrpObject srpObj, LinkedList<PcepLabelRangeObject> llLabelRangeList) {
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| 66 | this.srpObject = srpObj;
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| 67 | this.llLabelRangeList = llLabelRangeList;
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| 68 | }
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| 69 |
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| 70 | @Override
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| 71 | public PcepSrpObject getSrpObject() {
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| 72 | return srpObject;
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| 73 | }
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| 74 |
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| 75 | @Override
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| 76 | public void setSrpObject(PcepSrpObject srpObject) {
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| 77 | this.srpObject = srpObject;
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| 78 |
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| 79 | }
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| 80 |
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| 81 | @Override
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| 82 | public LinkedList<PcepLabelRangeObject> getLabelRangeList() {
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| 83 | return llLabelRangeList;
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| 84 | }
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| 85 |
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| 86 | @Override
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| 87 | public void setLabelRangeList(LinkedList<PcepLabelRangeObject> ll) {
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| 88 | this.llLabelRangeList = ll;
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| 89 | }
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| 90 |
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| 91 | /**
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| 92 | * Reads channel buffer and returns object of PcepLabelRange.
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| 93 | *
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| 94 | * @param cb of type channel buffer.
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| 95 | * @return object of PcepLabelRange
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| 96 | * @throws PcepParseException when fails to read from channel buffer
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| 97 | */
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| 98 | public static PcepLabelRange read(ChannelBuffer cb) throws PcepParseException {
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| 99 |
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| 100 | //parse and store SRP mandatory object
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| 101 | PcepSrpObject srpObj = null;
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| 102 | srpObj = PcepSrpObjectVer1.read(cb);
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| 103 | if (srpObj == null) {
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| 104 | throw new PcepParseException("Exception while parsing srp object");
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| 105 | }
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| 106 |
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| 107 | LinkedList<PcepLabelRangeObject> llLabelRangeList = new LinkedList<PcepLabelRangeObject>();
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| 108 | boolean bFoundLabelRangeObj = false;
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| 109 | while (0 < cb.readableBytes()) {
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| 110 | //parse and store <labelrange-list>
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| 111 | PcepLabelRangeObject lrObj;
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| 112 | lrObj = PcepLabelRangeObjectVer1.read(cb);
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| 113 | if (lrObj == null) {
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| 114 | throw new PcepParseException("Exception while parsing label range object");
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| 115 | } else {
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| 116 | llLabelRangeList.add(lrObj);
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| 117 | bFoundLabelRangeObj = true;
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| 118 | }
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| 119 | }
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| 120 |
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| 121 | if (!bFoundLabelRangeObj) {
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| 122 | throw new PcepParseException("At least one LABEL-RANGE MUST be present.");
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| 123 | }
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| 124 | return new PcepLabelRangeVer1(srpObj, llLabelRangeList);
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| 125 | }
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| 126 |
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| 127 | @Override
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| 128 | public int write(ChannelBuffer cb) throws PcepParseException {
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| 129 | //write Object header
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| 130 | int objStartIndex = cb.writerIndex();
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| 131 |
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| 132 | //write <SRP>
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| 133 | int objLenIndex = srpObject.write(cb);
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| 134 |
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| 135 | if (objLenIndex <= 0) {
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| 136 | throw new PcepParseException("bjectLength is " + objLenIndex);
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| 137 | }
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| 138 |
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| 139 | //write <labelrange-list>
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| 140 | ListIterator<PcepLabelRangeObject> listIterator = llLabelRangeList.listIterator();
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| 141 | while (listIterator.hasNext()) {
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| 142 | listIterator.next().write(cb);
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| 143 | }
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| 144 |
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| 145 | //Update object length now
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| 146 | int length = cb.writerIndex() - objStartIndex;
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| 147 | // As per RFC the length of object should be
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| 148 | // multiples of 4
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| 149 | int pad = length % 4;
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| 150 | if (pad != 0) {
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| 151 | pad = 4 - pad;
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| 152 | for (int i = 0; i < pad; i++) {
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| 153 | cb.writeByte((byte) 0);
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| 154 | }
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| 155 | length = length + pad;
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| 156 | }
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| 157 | cb.setShort(objLenIndex, (short) length);
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| 158 | return length;
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| 159 | }
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| 160 |
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| 161 | @Override
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| 162 | public String toString() {
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| 163 | return MoreObjects.toStringHelper(getClass()).add("srpObject", srpObject)
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| 164 | .add("LabelRangeList", llLabelRangeList).toString();
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| 165 | }
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| 166 | }
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