pce/src/main/java/org/opendaylight/transportpce/pce/graph/PostAlgoPathValidator.java

   1 /*
   2  * Copyright © 2017 AT&T, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.transportpce.pce.graph;
  10
  11 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  12 import java.util.ArrayList;
  13 import java.util.Arrays;
  14 import java.util.BitSet;
  15 import java.util.Collections;
  16 import java.util.HashMap;
  17 import java.util.List;
  18 import java.util.Map;
  19 import org.jgrapht.GraphPath;
  20 import org.opendaylight.transportpce.common.ResponseCodes;
  21 import org.opendaylight.transportpce.common.StringConstants;
  22 import org.opendaylight.transportpce.common.fixedflex.GridConstant;
  23 import org.opendaylight.transportpce.common.fixedflex.GridUtils;
  24 import org.opendaylight.transportpce.pce.constraints.PceConstraints;
  25 import org.opendaylight.transportpce.pce.constraints.PceConstraints.ResourcePair;
  26 import org.opendaylight.transportpce.pce.model.SpectrumAssignment;
  27 import org.opendaylight.transportpce.pce.networkanalyzer.PceNode;
  28 import org.opendaylight.transportpce.pce.networkanalyzer.PceResult;
  29 import org.opendaylight.yang.gen.v1.http.org.openroadm.network.types.rev200529.OpenroadmLinkType;
  30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.network.rev180226.NodeId;
  31 import org.opendaylight.yangtools.yang.common.Uint16;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public class PostAlgoPathValidator {
  36     /* Logging. */
  37     private static final Logger LOG = LoggerFactory.getLogger(PostAlgoPathValidator.class);
  38
  39     private static final double MIN_OSNR_W100G = 17;
  40     private static final double TRX_OSNR = 33;
  41     private static final double ADD_OSNR = 30;
  42     public static final Long CONST_OSNR = 1L;
  43     public static final double SYS_MARGIN = 0;
  44
  45     @SuppressFBWarnings(
  46         value = "SF_SWITCH_FALLTHROUGH",
  47         justification = "intentional fallthrough")
  48     public PceResult checkPath(GraphPath<String, PceGraphEdge> path, Map<NodeId, PceNode> allPceNodes,
  49         PceResult pceResult, PceConstraints pceHardConstraints, String serviceType) {
  50
  51         // check if the path is empty
  52         if (path.getEdgeList().isEmpty()) {
  53             pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
  54             return pceResult;
  55         }
  56         int tribSlotNb = 1;
  57         int spectralWidthSlotNumber = GridConstant.SPECTRAL_WIDTH_SLOT_NUMBER_MAP
  58             .getOrDefault(serviceType, GridConstant.NB_SLOTS_100G);
  59         SpectrumAssignment spectrumAssignment = null;
  60         //variable to deal with 1GE (Nb=1) and 10GE (Nb=10) cases
  61         switch (serviceType) {
  62             case StringConstants.SERVICE_TYPE_OTUC4:
  63             case StringConstants.SERVICE_TYPE_400GE:
  64                 spectralWidthSlotNumber = GridConstant.SPECTRAL_WIDTH_SLOT_NUMBER_MAP
  65                     .getOrDefault(serviceType, GridConstant.NB_SLOTS_400G);
  66             //fallthrough
  67             case StringConstants.SERVICE_TYPE_100GE_T:
  68             case StringConstants.SERVICE_TYPE_OTU4:
  69                 spectrumAssignment = getSpectrumAssignment(path,
  70                         allPceNodes, spectralWidthSlotNumber);
  71                 pceResult.setServiceType(serviceType);
  72                 if (spectrumAssignment.getBeginIndex() == 0 && spectrumAssignment.getStopIndex() == 0) {
  73                     pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
  74                     pceResult.setLocalCause(PceResult.LocalCause.NO_PATH_EXISTS);
  75                     return pceResult;
  76                 }
  77                 if (spectrumAssignment.isFlexGrid()) {
  78                     LOG.info("Spectrum assignment flexgrid mode");
  79                     pceResult.setResultWavelength(GridConstant.IRRELEVANT_WAVELENGTH_NUMBER);
  80                 } else {
  81                     LOG.info("Spectrum assignment fixedgrid mode");
  82                     pceResult.setResultWavelength(
  83                             GridUtils.getWaveLengthIndexFromSpectrumAssigment(spectrumAssignment.getBeginIndex()));
  84                 }
  85                 pceResult.setMinFreq(GridUtils.getStartFrequencyFromIndex(spectrumAssignment.getBeginIndex()));
  86                 pceResult.setMaxFreq(GridUtils.getStopFrequencyFromIndex(spectrumAssignment.getStopIndex()));
  87                 LOG.info("In PostAlgoPathValidator: spectrum assignment found {} {}", spectrumAssignment, path);
  88
  89                 // Check the OSNR
  90                 if (!checkOSNR(path)) {
  91                     pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
  92                     pceResult.setLocalCause(PceResult.LocalCause.OUT_OF_SPEC_OSNR);
  93                     return pceResult;
  94                 }
  95
  96                 // Check if MaxLatency is defined in the hard constraints
  97                 if ((pceHardConstraints.getMaxLatency() != -1)
  98                         && (!checkLatency(pceHardConstraints.getMaxLatency(), path))) {
  99                     pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
 100                     pceResult.setLocalCause(PceResult.LocalCause.TOO_HIGH_LATENCY);
 101                     return pceResult;
 102                 }
 103
 104                 // Check if nodes are included in the hard constraints
 105                 if (!checkInclude(path, pceHardConstraints)) {
 106                     pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
 107                     pceResult.setLocalCause(PceResult.LocalCause.HD_NODE_INCLUDE);
 108                     return pceResult;
 109                 }
 110
 111                 // TODO here other post algo validations can be added
 112                 // more data can be sent to PceGraph module via PceResult structure if required
 113
 114                 pceResult.setRC(ResponseCodes.RESPONSE_OK);
 115                 pceResult.setLocalCause(PceResult.LocalCause.NONE);
 116                 break;
 117             case StringConstants.SERVICE_TYPE_100GE_M:
 118             case StringConstants.SERVICE_TYPE_10GE:
 119                 tribSlotNb = StringConstants.SERVICE_TYPE_10GE.equals(serviceType) ? 8 : 20;
 120             //fallthrough
 121             case StringConstants.SERVICE_TYPE_1GE:
 122                 pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
 123                 pceResult.setServiceType(serviceType);
 124                 Map<String, Uint16> tribPort = chooseTribPort(path, allPceNodes);
 125                 Map<String, List<Uint16>> tribSlot = chooseTribSlot(path, allPceNodes, tribSlotNb);
 126
 127                 if (tribPort != null && tribSlot != null) {
 128                     pceResult.setResultTribPort(tribPort);
 129                     pceResult.setResultTribSlot(tribSlot);
 130                     pceResult.setResultTribSlotNb(tribSlotNb);
 131                     pceResult.setRC(ResponseCodes.RESPONSE_OK);
 132                     LOG.info("In PostAlgoPathValidator: found TribPort {} - tribSlot {} - tribSlotNb {}",
 133                         tribPort, tribSlot, tribSlotNb);
 134                 }
 135                 break;
 136             case StringConstants.SERVICE_TYPE_ODU4:
 137             case StringConstants.SERVICE_TYPE_ODUC4:
 138                 pceResult.setRC(ResponseCodes.RESPONSE_OK);
 139                 LOG.info("In PostAlgoPathValidator: ODU4/ODUC4 path found {}", path);
 140                 break;
 141             default:
 142                 pceResult.setRC(ResponseCodes.RESPONSE_FAILED);
 143                 LOG.warn("In PostAlgoPathValidator checkPath: unsupported serviceType {} found {}",
 144                     serviceType, path);
 145                 break;
 146         }
 147         return pceResult;
 148     }
 149
 150     // Check the latency
 151     private boolean checkLatency(Long maxLatency, GraphPath<String, PceGraphEdge> path) {
 152         double latency = 0;
 153
 154         for (PceGraphEdge edge : path.getEdgeList()) {
 155             try {
 156                 latency += edge.link().getLatency();
 157                 LOG.debug("- In checkLatency: latency of {} = {} units", edge.link().getLinkId().getValue(), latency);
 158             } catch (NullPointerException e) {
 159                 LOG.warn("- In checkLatency: the link {} does not contain latency field",
 160                     edge.link().getLinkId().getValue());
 161             }
 162         }
 163         return (latency < maxLatency);
 164     }
 165
 166     // Check the inclusion if it is defined in the hard constraints
 167     private boolean checkInclude(GraphPath<String, PceGraphEdge> path, PceConstraints pceHardConstraintsInput) {
 168         List<ResourcePair> listToInclude = pceHardConstraintsInput.getListToInclude();
 169         if (listToInclude.isEmpty()) {
 170             return true;
 171         }
 172
 173         List<PceGraphEdge> pathEdges = path.getEdgeList();
 174         LOG.debug(" in checkInclude vertex list: [{}]", path.getVertexList());
 175
 176         List<String> listOfElementsSubNode = new ArrayList<>();
 177         listOfElementsSubNode.add(pathEdges.get(0).link().getsourceNetworkSupNodeId());
 178         listOfElementsSubNode.addAll(listOfElementsBuild(pathEdges, PceConstraints.ResourceType.NODE,
 179             pceHardConstraintsInput));
 180
 181         List<String> listOfElementsCLLI = new ArrayList<>();
 182         listOfElementsCLLI.add(pathEdges.get(0).link().getsourceCLLI());
 183         listOfElementsCLLI.addAll(listOfElementsBuild(pathEdges, PceConstraints.ResourceType.CLLI,
 184             pceHardConstraintsInput));
 185
 186         List<String> listOfElementsSRLG = new ArrayList<>();
 187         // first link is XPONDEROUTPUT, no SRLG for it
 188         listOfElementsSRLG.add("NONE");
 189         listOfElementsSRLG.addAll(listOfElementsBuild(pathEdges, PceConstraints.ResourceType.SRLG,
 190             pceHardConstraintsInput));
 191
 192         // validation: check each type for each element
 193         for (ResourcePair next : listToInclude) {
 194             int indx = -1;
 195             switch (next.getType()) {
 196                 case NODE:
 197                     if (listOfElementsSubNode.contains(next.getName())) {
 198                         indx = listOfElementsSubNode.indexOf(next.getName());
 199                     }
 200                     break;
 201                 case SRLG:
 202                     if (listOfElementsSRLG.contains(next.getName())) {
 203                         indx = listOfElementsSRLG.indexOf(next.getName());
 204                     }
 205                     break;
 206                 case CLLI:
 207                     if (listOfElementsCLLI.contains(next.getName())) {
 208                         indx = listOfElementsCLLI.indexOf(next.getName());
 209                     }
 210                     break;
 211                 default:
 212                     LOG.warn(" in checkInclude vertex list unsupported resource type: [{}]", next.getType());
 213             }
 214
 215             if (indx < 0) {
 216                 LOG.debug(" in checkInclude stopped : {} ", next.getName());
 217                 return false;
 218             }
 219
 220             LOG.debug(" in checkInclude next found {} in {}", next.getName(), path.getVertexList());
 221
 222             listOfElementsSubNode.subList(0, indx).clear();
 223             listOfElementsCLLI.subList(0, indx).clear();
 224             listOfElementsSRLG.subList(0, indx).clear();
 225         }
 226
 227         LOG.info(" in checkInclude passed : {} ", path.getVertexList());
 228         return true;
 229     }
 230
 231     private List<String> listOfElementsBuild(List<PceGraphEdge> pathEdges, PceConstraints.ResourceType type,
 232         PceConstraints pceHardConstraints) {
 233
 234         List<String> listOfElements = new ArrayList<>();
 235         for (PceGraphEdge link : pathEdges) {
 236             switch (type) {
 237                 case NODE:
 238                     listOfElements.add(link.link().getdestNetworkSupNodeId());
 239                     break;
 240                 case CLLI:
 241                     listOfElements.add(link.link().getdestCLLI());
 242                     break;
 243                 case SRLG:
 244                     if (link.link().getlinkType() != OpenroadmLinkType.ROADMTOROADM) {
 245                         listOfElements.add("NONE");
 246                         break;
 247                     }
 248                     // srlg of link is List<Long>. But in this algo we need string representation of
 249                     // one SRLG
 250                     // this should be any SRLG mentioned in include constraints if any of them if
 251                     // mentioned
 252                     boolean found = false;
 253                     for (Long srlg : link.link().getsrlgList()) {
 254                         String srlgStr = String.valueOf(srlg);
 255                         if (pceHardConstraints.getSRLGnames().contains(srlgStr)) {
 256                             listOfElements.add(srlgStr);
 257                             LOG.info("listOfElementsBuild. FOUND SRLG {} in link {}", srlgStr, link.link());
 258                             found = true;
 259                         }
 260                     }
 261                     if (!found) {
 262                         // there is no specific srlg to include. thus add to list just the first one
 263                         listOfElements.add("NONE");
 264                     }
 265                     break;
 266                 default:
 267                     LOG.debug("listOfElementsBuild unsupported resource type");
 268             }
 269         }
 270         return listOfElements;
 271     }
 272
 273     private Map<String, Uint16> chooseTribPort(GraphPath<String,
 274         PceGraphEdge> path, Map<NodeId, PceNode> allPceNodes) {
 275         LOG.info("In choosetribPort: edgeList = {} ", path.getEdgeList());
 276         Map<String, Uint16> tribPortMap = new HashMap<>();
 277
 278         for (PceGraphEdge edge : path.getEdgeList()) {
 279             NodeId linkSrcNode = edge.link().getSourceId();
 280             String linkSrcTp = edge.link().getSourceTP().toString();
 281             NodeId linkDestNode = edge.link().getDestId();
 282             String linkDestTp = edge.link().getDestTP().toString();
 283             PceNode pceOtnNodeSrc = allPceNodes.get(linkSrcNode);
 284             PceNode pceOtnNodeDest = allPceNodes.get(linkDestNode);
 285             List<Uint16> srcTpnPool = pceOtnNodeSrc.getAvailableTribPorts().get(linkSrcTp);
 286             List<Uint16> destTpnPool = pceOtnNodeDest.getAvailableTribPorts().get(linkDestTp);
 287             List<Uint16> commonEdgeTpnPool = new ArrayList<>();
 288             for (Uint16 integer : srcTpnPool) {
 289                 if (destTpnPool.contains(integer)) {
 290                     commonEdgeTpnPool.add(integer);
 291                 }
 292             }
 293             Collections.sort(commonEdgeTpnPool);
 294             if (!commonEdgeTpnPool.isEmpty()) {
 295                 tribPortMap.put(edge.link().getLinkId().getValue(), commonEdgeTpnPool.get(0));
 296             }
 297         }
 298         tribPortMap.forEach((k,v) -> LOG.info("TribPortMap : k = {}, v = {}", k, v));
 299         return tribPortMap;
 300     }
 301
 302     private Map<String, List<Uint16>> chooseTribSlot(GraphPath<String,
 303         PceGraphEdge> path, Map<NodeId, PceNode> allPceNodes, int nbSlot) {
 304         LOG.info("In choosetribSlot: edgeList = {} ", path.getEdgeList());
 305         Map<String, List<Uint16>> tribSlotMap = new HashMap<>();
 306
 307         for (PceGraphEdge edge : path.getEdgeList()) {
 308             NodeId linkSrcNode = edge.link().getSourceId();
 309             String linkSrcTp = edge.link().getSourceTP().toString();
 310             NodeId linkDestNode = edge.link().getDestId();
 311             String linkDestTp = edge.link().getDestTP().toString();
 312             PceNode pceOtnNodeSrc = allPceNodes.get(linkSrcNode);
 313             PceNode pceOtnNodeDest = allPceNodes.get(linkDestNode);
 314             List<Uint16> srcTsPool = pceOtnNodeSrc.getAvailableTribSlots().get(linkSrcTp);
 315             List<Uint16> destTsPool = pceOtnNodeDest.getAvailableTribSlots().get(linkDestTp);
 316             List<Uint16> commonEdgeTsPool = new ArrayList<>();
 317             List<Uint16> tribSlotList = new ArrayList<>();
 318             for (Uint16 integer : srcTsPool) {
 319                 if (destTsPool.contains(integer)) {
 320                     commonEdgeTsPool.add(integer);
 321                 }
 322             }
 323             Collections.sort(commonEdgeTsPool);
 324             boolean discontinue = true;
 325             int index = 0;
 326             while (discontinue && (commonEdgeTsPool.size() - index >= nbSlot)) {
 327                 discontinue = false;
 328                 Integer val = commonEdgeTsPool.get(index).toJava();
 329                 for (int i = 0; i < nbSlot; i++) {
 330                     if (commonEdgeTsPool.get(index + i).equals(Uint16.valueOf(val + i))) {
 331                         tribSlotList.add(commonEdgeTsPool.get(index + i));
 332                     } else {
 333                         discontinue = true;
 334                         tribSlotList.clear();
 335                         index += i;
 336                         break;
 337                     }
 338                 }
 339             }
 340             tribSlotMap.put(edge.link().getLinkId().getValue(), tribSlotList);
 341         }
 342         tribSlotMap.forEach((k,v) -> LOG.info("TribSlotMap : k = {}, v = {}", k, v));
 343         return tribSlotMap;
 344     }
 345
 346     // Check the path OSNR
 347     private boolean checkOSNR(GraphPath<String, PceGraphEdge> path) {
 348         double linkOsnrDb;
 349         double osnrDb = 0;
 350         LOG.info("- In checkOSNR: OSNR of the transmitter = {} dB", TRX_OSNR);
 351         LOG.info("- In checkOSNR: add-path incremental OSNR = {} dB", ADD_OSNR);
 352         double inverseLocalOsnr = getInverseOsnrLinkLu(TRX_OSNR) + getInverseOsnrLinkLu(ADD_OSNR);
 353         for (PceGraphEdge edge : path.getEdgeList()) {
 354             if (edge.link().getlinkType() == OpenroadmLinkType.ROADMTOROADM) {
 355                 // link OSNR in dB
 356                 linkOsnrDb = edge.link().getosnr();
 357                 LOG.info("- In checkOSNR: OSNR of {} = {} dB", edge.link().getLinkId().getValue(), linkOsnrDb);
 358                 // 1 over the local OSNR, in linear units
 359                 inverseLocalOsnr += getInverseOsnrLinkLu(linkOsnrDb);
 360             }
 361         }
 362         try {
 363             osnrDb = getOsnrDb(1 / inverseLocalOsnr);
 364         } catch (ArithmeticException e) {
 365             LOG.debug("In checkOSNR: OSNR is equal to 0 and the number of links is: {}", path.getEdgeList().size());
 366             return false;
 367         }
 368         LOG.info("In checkOSNR: OSNR of the path is {} dB", osnrDb);
 369         return ((osnrDb + SYS_MARGIN) > MIN_OSNR_W100G);
 370     }
 371
 372     private double getOsnrDb(double osnrLu) {
 373         double osnrDb;
 374         osnrDb = 10 * Math.log10(osnrLu);
 375         return osnrDb;
 376     }
 377
 378     private double getInverseOsnrLinkLu(double linkOsnrDb) {
 379         // 1 over the link OSNR, in linear units
 380         double linkOsnrLu;
 381         linkOsnrLu = Math.pow(10, (linkOsnrDb / 10.0));
 382         LOG.debug("In retrieveosnr: the inverse of link osnr is {} (Linear Unit)", linkOsnrLu);
 383         return (CONST_OSNR / linkOsnrLu);
 384     }
 385
 386     /**
 387      * Get spectrum assignment for path.
 388      *
 389      * @param path                    the path for which we get spectrum assignment.
 390      * @param allPceNodes             all optical nodes.
 391      * @param spectralWidthSlotNumber number of slot for spectral width. Depends on
 392      *                                service type.
 393      * @return a spectrum assignment object which contains begin and end index. If
 394      *         no spectrum assignment found, beginIndex = stopIndex = 0
 395      */
 396     private SpectrumAssignment getSpectrumAssignment(GraphPath<String, PceGraphEdge> path,
 397             Map<NodeId, PceNode> allPceNodes, int spectralWidthSlotNumber) {
 398         byte[] freqMap = new byte[GridConstant.NB_OCTECTS];
 399         Arrays.fill(freqMap, (byte) GridConstant.AVAILABLE_SLOT_VALUE);
 400         BitSet result = BitSet.valueOf(freqMap);
 401         boolean isFlexGrid = true;
 402         LOG.info("Processing path {} with length {}", path, path.getLength());
 403         BitSet pceNodeFreqMap;
 404         for (PceGraphEdge edge : path.getEdgeList()) {
 405             LOG.info("Processing source {} ", edge.link().getSourceId());
 406             if (allPceNodes.containsKey(edge.link().getSourceId())) {
 407                 PceNode pceNode = allPceNodes.get(edge.link().getSourceId());
 408                 LOG.info("Processing PCE node {}", pceNode);
 409                 if (StringConstants.OPENROADM_DEVICE_VERSION_1_2_1.equals(pceNode.getVersion())) {
 410                     LOG.info("Node {}: version is {} and slot width granularity is {} -> fixed grid mode",
 411                         pceNode.getNodeId(), pceNode.getVersion(), pceNode.getSlotWidthGranularity());
 412                     isFlexGrid = false;
 413                 }
 414                 if ((pceNode.getSlotWidthGranularity().equals(GridConstant.SLOT_WIDTH_50))
 415                     && (pceNode.getCentralFreqGranularity().equals(GridConstant.SLOT_WIDTH_50))) {
 416                     LOG.info("Node {}: version is {} with slot width granularity  {} and central "
 417                             + "frequency granularity is {} -> fixed grid mode",
 418                         pceNode.getNodeId(), pceNode.getVersion(), pceNode.getSlotWidthGranularity(),
 419                         pceNode.getCentralFreqGranularity());
 420                     isFlexGrid = false;
 421                 }
 422                 pceNodeFreqMap = pceNode.getBitSetData();
 423                 LOG.debug("Pce node bitset {}", pceNodeFreqMap);
 424                 if (pceNodeFreqMap != null) {
 425                     result.and(pceNodeFreqMap);
 426                     LOG.debug("intermediate bitset {}", result);
 427                 }
 428             }
 429         }
 430         LOG.debug("Bitset result {}", result);
 431         return computeBestSpectrumAssignment(result, spectralWidthSlotNumber, isFlexGrid);
 432     }
 433
 434     /**
 435      * Compute spectrum assignment from spectrum occupation for spectral width.
 436      *
 437      * @param spectrumOccupation      the spectrum occupation BitSet.
 438      * @param spectralWidthSlotNumber the nb slots for spectral width.
 439      * @param isFlexGrid              true if flexible grid, false otherwise.
 440      * @return a spectrum assignment object which contains begin and stop index. If
 441      *         no spectrum assignment found, beginIndex = stopIndex = 0
 442      */
 443     private SpectrumAssignment computeBestSpectrumAssignment(BitSet spectrumOccupation, int spectralWidthSlotNumber,
 444             boolean isFlexGrid) {
 445         SpectrumAssignment spectrumAssignment = new SpectrumAssignment(0, 0);
 446         spectrumAssignment.setFlexGrid(isFlexGrid);
 447         BitSet referenceBitSet = new BitSet(spectralWidthSlotNumber);
 448         referenceBitSet.set(0, spectralWidthSlotNumber);
 449         int nbSteps = 1;
 450         if (isFlexGrid) {
 451             nbSteps = spectralWidthSlotNumber;
 452         }
 453         //higher is the frequency, smallest is the wavelength number
 454         //in operational, the allocation is done through wavelength starting from the smallest
 455         //so we have to loop from the last element of the spectrum occupation
 456         for (int i = spectrumOccupation.size(); i >= spectralWidthSlotNumber; i -= nbSteps) {
 457             if (spectrumOccupation.get(i - spectralWidthSlotNumber, i).equals(referenceBitSet)) {
 458                 spectrumAssignment.setBeginIndex(i - spectralWidthSlotNumber);
 459                 spectrumAssignment.setStopIndex(i - 1);
 460                 break;
 461             }
 462         }
 463         return spectrumAssignment;
 464     }
 465
 466 }