/**
  * Returns the desired spectrum.
  *
  * @param spectrumKey the key of the spectrum
  * @return the desired spectrum
  */
 public MSnSpectrum getSpectrum(String spectrumKey) {
   String spectrumFile = Spectrum.getSpectrumFile(spectrumKey);
   String spectrumTitle = Spectrum.getSpectrumTitle(spectrumKey);
   try {
     return (MSnSpectrum) spectrumFactory.getSpectrum(spectrumFile, spectrumTitle);
   } catch (Exception e) {
     System.out.println(e.getMessage());
     return null;
   }
 }
  /**
   * Fills the PSM specific map.
   *
   * @param inputMap The input map
   * @param waitingHandler the handler displaying feedback to the user
   * @param shotgunProtocol information about the protocol
   * @param identificationParameters the identification parameters
   * @throws java.sql.SQLException exception thrown whenever an error occurred while interacting
   *     with the back-end database
   * @throws java.io.IOException exception thrown whenever an error occurred while reading an
   *     external file
   * @throws java.lang.ClassNotFoundException exception thrown whenever an error occurred while
   *     deserializing an object
   * @throws java.lang.InterruptedException exception thrown whenever a threading error occurred
   * @throws uk.ac.ebi.jmzml.xml.io.MzMLUnmarshallerException exception thrown whenever an error
   *     occurred while reading an mzML file
   */
  public void selectBestHitAndFillPsmMap(
      InputMap inputMap,
      WaitingHandler waitingHandler,
      ShotgunProtocol shotgunProtocol,
      IdentificationParameters identificationParameters)
      throws SQLException, IOException, ClassNotFoundException, InterruptedException,
          MzMLUnmarshallerException {

    waitingHandler.setSecondaryProgressCounterIndeterminate(false);
    waitingHandler.setMaxSecondaryProgressCounter(identification.getSpectrumIdentificationSize());

    PeptideSpectrumAnnotator spectrumAnnotator = new PeptideSpectrumAnnotator();
    boolean multiSE = inputMap.isMultipleAlgorithms();

    SequenceMatchingPreferences sequenceMatchingPreferences =
        identificationParameters.getSequenceMatchingPreferences();
    AnnotationSettings annotationPreferences = identificationParameters.getAnnotationPreferences();

    PeptideAssumptionFilter idFilter = identificationParameters.getPeptideAssumptionFilter();

    // Keep a map of the spectrum keys grouped by peptide
    HashMap<String, ArrayList<String>> orderedPsmMap = null;
    if (MemoryConsumptionStatus.memoryUsed() < 0.8) {
      orderedPsmMap =
          new HashMap<String, ArrayList<String>>(
              identification.getSpectrumIdentificationMap().size());
    }

    PSParameter psParameter = new PSParameter();

    for (String spectrumFileName : identification.getSpectrumFiles()) {

      HashMap<String, ArrayList<String>> keysMap = null;
      if (orderedPsmMap != null) {
        keysMap = new HashMap<String, ArrayList<String>>();
      }

      PsmIterator psmIterator =
          identification.getPsmIterator(spectrumFileName, null, true, waitingHandler);

      while (psmIterator.hasNext()) {

        SpectrumMatch advocateMatch = psmIterator.next();
        String spectrumKey = advocateMatch.getKey();

        // map of the peptide first hits for this spectrum: score -> max protein count -> max search
        // engine votes -> amino acids annotated -> min mass deviation -> peptide sequence
        HashMap<
                Double,
                HashMap<
                    Integer,
                    HashMap<
                        Integer,
                        HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>>>
            peptideAssumptions =
                new HashMap<
                    Double,
                    HashMap<
                        Integer,
                        HashMap<
                            Integer,
                            HashMap<
                                Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>>>();

        // map of the tag first hits: score -> assumptions
        HashMap<Double, ArrayList<TagAssumption>> tagAssumptions =
            new HashMap<Double, ArrayList<TagAssumption>>();

        ArrayList<String> identifications = new ArrayList<String>();

        HashMap<Integer, HashMap<Double, ArrayList<SpectrumIdentificationAssumption>>> assumptions =
            identification.getAssumptions(spectrumKey);

        for (int searchEngine1 : assumptions.keySet()) {

          HashMap<Double, ArrayList<SpectrumIdentificationAssumption>> advocate1Map =
              assumptions.get(searchEngine1);

          double bestEvalue = Collections.min(advocate1Map.keySet());

          for (SpectrumIdentificationAssumption assumption1 : advocate1Map.get(bestEvalue)) {

            if (assumption1 instanceof PeptideAssumption) {

              PeptideAssumption peptideAssumption1 = (PeptideAssumption) assumption1;
              String id = peptideAssumption1.getPeptide().getKey();

              if (!identifications.contains(id)) {

                psParameter = (PSParameter) peptideAssumption1.getUrParam(psParameter);
                double p;

                if (multiSE && sequenceFactory.concatenatedTargetDecoy()) {
                  p = psParameter.getSearchEngineProbability();
                } else {
                  p = peptideAssumption1.getScore();
                }

                int nSE = 1;
                int proteinMax = 1;
                for (String protein :
                    peptideAssumption1
                        .getPeptide()
                        .getParentProteins(sequenceMatchingPreferences)) {
                  Integer tempCount = proteinCount.get(protein);
                  if (tempCount != null && tempCount > proteinMax) {
                    proteinMax = tempCount;
                  }
                }

                for (int searchEngine2 : assumptions.keySet()) {

                  if (searchEngine1 != searchEngine2) {

                    HashMap<Double, ArrayList<SpectrumIdentificationAssumption>> advocate2Map =
                        assumptions.get(searchEngine2);

                    boolean found = false;
                    ArrayList<Double> eValues2 = new ArrayList<Double>(advocate2Map.keySet());
                    Collections.sort(eValues2);

                    for (double eValue2 : eValues2) {
                      for (SpectrumIdentificationAssumption assumption2 :
                          advocate2Map.get(eValue2)) {

                        if (assumption2 instanceof PeptideAssumption) {

                          PeptideAssumption peptideAssumption2 = (PeptideAssumption) assumption2;

                          if (peptideAssumption1
                              .getPeptide()
                              .isSameSequenceAndModificationStatus(
                                  peptideAssumption2.getPeptide(), sequenceMatchingPreferences)) {
                            PSParameter psParameter2 =
                                (PSParameter) peptideAssumption2.getUrParam(psParameter);
                            p = p * psParameter2.getSearchEngineProbability();
                            nSE++;
                            found = true;
                            break;
                          }
                        }
                      }
                      if (found) {
                        break;
                      }
                    }
                  }
                }

                identifications.add(id);

                HashMap<
                        Integer,
                        HashMap<
                            Integer,
                            HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>>
                    pMap = peptideAssumptions.get(p);
                if (pMap == null) {
                  pMap =
                      new HashMap<
                          Integer,
                          HashMap<
                              Integer,
                              HashMap<
                                  Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>>(
                          advocate1Map.size());
                  peptideAssumptions.put(p, pMap);
                }

                HashMap<
                        Integer,
                        HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>
                    proteinMaxMap = pMap.get(proteinMax);
                if (proteinMaxMap == null) {
                  proteinMaxMap =
                      new HashMap<
                          Integer,
                          HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>(1);
                  pMap.put(proteinMax, proteinMaxMap);
                }

                HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>> nSeMap =
                    proteinMaxMap.get(nSE);
                if (nSeMap == null) {
                  nSeMap =
                      new HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>(1);
                  proteinMaxMap.put(nSE, nSeMap);
                  HashMap<Double, HashMap<String, PeptideAssumption>> coverageMap =
                      new HashMap<Double, HashMap<String, PeptideAssumption>>(1);
                  nSeMap.put(-1, coverageMap);
                  HashMap<String, PeptideAssumption> assumptionMap =
                      new HashMap<String, PeptideAssumption>(1);
                  coverageMap.put(-1.0, assumptionMap);
                  assumptionMap.put(
                      peptideAssumption1.getPeptide().getSequenceWithLowerCasePtms(),
                      peptideAssumption1);
                } else {
                  MSnSpectrum spectrum = (MSnSpectrum) spectrumFactory.getSpectrum(spectrumKey);

                  HashMap<Double, HashMap<String, PeptideAssumption>> coverageMap = nSeMap.get(-1);
                  if (coverageMap != null) {
                    HashMap<String, PeptideAssumption> assumptionMap = coverageMap.get(-1.0);
                    for (PeptideAssumption tempAssumption :
                        assumptionMap.values()) { // There should be only one
                      Peptide peptide = tempAssumption.getPeptide();
                      SpecificAnnotationSettings specificAnnotationPreferences =
                          annotationPreferences.getSpecificAnnotationPreferences(
                              spectrum.getSpectrumKey(),
                              tempAssumption,
                              identificationParameters.getSequenceMatchingPreferences(),
                              identificationParameters
                                  .getPtmScoringPreferences()
                                  .getSequenceMatchingPreferences());
                      HashMap<Integer, ArrayList<IonMatch>> coveredAminoAcids =
                          spectrumAnnotator.getCoveredAminoAcids(
                              annotationPreferences,
                              specificAnnotationPreferences,
                              (MSnSpectrum) spectrum,
                              peptide);
                      int nIons = coveredAminoAcids.size();
                      nSeMap.put(nIons, coverageMap);
                    }
                    nSeMap.remove(-1);
                  }

                  Peptide peptide = peptideAssumption1.getPeptide();
                  SpecificAnnotationSettings specificAnnotationPreferences =
                      annotationPreferences.getSpecificAnnotationPreferences(
                          spectrum.getSpectrumKey(),
                          peptideAssumption1,
                          identificationParameters.getSequenceMatchingPreferences(),
                          identificationParameters
                              .getPtmScoringPreferences()
                              .getSequenceMatchingPreferences());
                  HashMap<Integer, ArrayList<IonMatch>> coveredAminoAcids =
                      spectrumAnnotator.getCoveredAminoAcids(
                          annotationPreferences,
                          specificAnnotationPreferences,
                          (MSnSpectrum) spectrum,
                          peptide);
                  int nIons = coveredAminoAcids.size();

                  coverageMap = nSeMap.get(nIons);
                  if (coverageMap == null) {
                    coverageMap = new HashMap<Double, HashMap<String, PeptideAssumption>>(1);
                    HashMap<String, PeptideAssumption> assumptionMap =
                        new HashMap<String, PeptideAssumption>(1);
                    assumptionMap.put(
                        peptideAssumption1.getPeptide().getSequenceWithLowerCasePtms(),
                        peptideAssumption1);
                    coverageMap.put(-1.0, assumptionMap);
                    nSeMap.put(nIons, coverageMap);
                  } else {
                    HashMap<String, PeptideAssumption> assumptionMap = coverageMap.get(-1.0);
                    if (assumptionMap != null) {
                      for (PeptideAssumption tempAssumption :
                          assumptionMap.values()) { // There should be only one
                        double massError =
                            Math.abs(
                                tempAssumption.getDeltaMass(
                                    spectrum.getPrecursor().getMz(),
                                    shotgunProtocol.isMs1ResolutionPpm()));
                        coverageMap.put(massError, assumptionMap);
                      }
                      coverageMap.remove(-1.0);
                    }

                    double massError =
                        Math.abs(
                            peptideAssumption1.getDeltaMass(
                                spectrum.getPrecursor().getMz(),
                                shotgunProtocol.isMs1ResolutionPpm()));
                    assumptionMap = coverageMap.get(massError);
                    if (assumptionMap == null) {
                      assumptionMap = new HashMap<String, PeptideAssumption>(1);
                      coverageMap.put(massError, assumptionMap);
                    }
                    assumptionMap.put(
                        peptideAssumption1.getPeptide().getSequenceWithLowerCasePtms(),
                        peptideAssumption1);
                  }
                }
              }
            } else if (assumption1 instanceof TagAssumption) {
              TagAssumption tagAssumption = (TagAssumption) assumption1;
              ArrayList<TagAssumption> assumptionList = tagAssumptions.get(bestEvalue);
              if (assumptionList == null) {
                assumptionList = new ArrayList<TagAssumption>();
                tagAssumptions.put(bestEvalue, assumptionList);
              }
              assumptionList.add(tagAssumption);
            }
          }
        }

        SpectrumMatch spectrumMatch = new SpectrumMatch(spectrumKey);
        if (!peptideAssumptions.isEmpty()) {

          PeptideAssumption bestPeptideAssumption = null;
          ArrayList<Double> ps = new ArrayList<Double>(peptideAssumptions.keySet());
          Collections.sort(ps);
          double retainedP = 0;

          for (double p : ps) {

            retainedP = p;
            HashMap<
                    Integer,
                    HashMap<
                        Integer,
                        HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>>
                pMap = peptideAssumptions.get(p);
            ArrayList<Integer> proteinMaxs = new ArrayList<Integer>(pMap.keySet());
            Collections.sort(proteinMaxs, Collections.reverseOrder());

            for (int proteinMax : proteinMaxs) {

              HashMap<
                      Integer,
                      HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>>>
                  proteinMaxMap = pMap.get(proteinMax);
              ArrayList<Integer> nSEs = new ArrayList<Integer>(proteinMaxMap.keySet());
              Collections.sort(nSEs, Collections.reverseOrder());

              for (int nSE : nSEs) {

                HashMap<Integer, HashMap<Double, HashMap<String, PeptideAssumption>>> nSeMap =
                    proteinMaxMap.get(nSE);
                ArrayList<Integer> coverages = new ArrayList<Integer>(nSeMap.keySet());
                Collections.sort(coverages, Collections.reverseOrder());

                for (Integer coverage : coverages) {

                  HashMap<Double, HashMap<String, PeptideAssumption>> coverageMap =
                      nSeMap.get(coverage);
                  ArrayList<Double> minErrors = new ArrayList<Double>(coverageMap.keySet());
                  Collections.sort(minErrors);

                  for (double minError : minErrors) {

                    HashMap<String, PeptideAssumption> bestPeptideAssumptions =
                        coverageMap.get(minError);
                    ArrayList<String> sequences =
                        new ArrayList<String>(bestPeptideAssumptions.keySet());
                    Collections.sort(sequences);

                    for (String sequence : sequences) {
                      PeptideAssumption peptideAssumption = bestPeptideAssumptions.get(sequence);
                      if (idFilter.validateProteins(
                          peptideAssumption.getPeptide(), sequenceMatchingPreferences)) {
                        bestPeptideAssumption = peptideAssumption;
                        break;
                      }
                    }
                    if (bestPeptideAssumption != null) {
                      break;
                    }
                  }
                  if (bestPeptideAssumption != null) {
                    break;
                  }
                }
                if (bestPeptideAssumption != null) {
                  break;
                }
              }
              if (bestPeptideAssumption != null) {
                break;
              }
            }
            if (bestPeptideAssumption != null) {
              break;
            }
          }
          if (bestPeptideAssumption != null) {

            if (multiSE) {

              // try to find the most likely modification localization based on the search engine
              // results
              HashMap<PeptideAssumption, ArrayList<Double>> assumptionPEPs =
                  new HashMap<PeptideAssumption, ArrayList<Double>>();
              String bestAssumptionKey =
                  bestPeptideAssumption.getPeptide().getMatchingKey(sequenceMatchingPreferences);

              for (int searchEngine : assumptions.keySet()) {

                boolean found = false;
                HashMap<Double, ArrayList<SpectrumIdentificationAssumption>> advocateMap =
                    assumptions.get(searchEngine);
                ArrayList<Double> eValues = new ArrayList<Double>(advocateMap.keySet());
                Collections.sort(eValues);

                for (double eValue : eValues) {
                  for (SpectrumIdentificationAssumption assumption : advocateMap.get(eValue)) {

                    if (assumption instanceof PeptideAssumption) {

                      PeptideAssumption peptideAssumption = (PeptideAssumption) assumption;

                      if (peptideAssumption
                          .getPeptide()
                          .getMatchingKey(sequenceMatchingPreferences)
                          .equals(bestAssumptionKey)) {

                        found = true;
                        boolean found2 = false;

                        for (PeptideAssumption assumption1 : assumptionPEPs.keySet()) {
                          if (assumption1
                              .getPeptide()
                              .sameModificationsAs(peptideAssumption.getPeptide())) {
                            found2 = true;
                            psParameter = (PSParameter) assumption.getUrParam(psParameter);
                            ArrayList<Double> peps = assumptionPEPs.get(assumption1);
                            peps.add(psParameter.getSearchEngineProbability());
                            break;
                          }
                        }

                        if (!found2) {
                          ArrayList<Double> peps = new ArrayList<Double>(1);
                          assumptionPEPs.put(peptideAssumption, peps);
                          psParameter = (PSParameter) assumption.getUrParam(psParameter);
                          peps.add(psParameter.getSearchEngineProbability());
                        }
                      }
                    }
                  }

                  if (found) {
                    break;
                  }
                }
              }

              Double bestSeP = null;
              int nSe = -1;

              for (PeptideAssumption peptideAssumption : assumptionPEPs.keySet()) {

                ArrayList<Double> peps = assumptionPEPs.get(peptideAssumption);
                Double sep = Collections.min(peps);

                if (bestSeP == null || bestSeP > sep) {
                  bestSeP = sep;
                  nSe = peps.size();
                  bestPeptideAssumption = peptideAssumption;
                } else if (peps.size() > nSe) {
                  if (sep != null && (Math.abs(sep - bestSeP) <= 1e-10)) {
                    nSe = peps.size();
                    bestPeptideAssumption = peptideAssumption;
                  }
                }
              }
            }

            // create a PeptideShaker match based on the best search engine match
            Peptide sePeptide = bestPeptideAssumption.getPeptide();
            ArrayList<String> psProteins =
                new ArrayList<String>(sePeptide.getParentProteins(sequenceMatchingPreferences));
            ArrayList<ModificationMatch> psModificationMatches = null;
            if (sePeptide.isModified()) {
              psModificationMatches =
                  new ArrayList<ModificationMatch>(sePeptide.getNModifications());
              for (ModificationMatch seModMatch : sePeptide.getModificationMatches()) {
                psModificationMatches.add(
                    new ModificationMatch(
                        seModMatch.getTheoreticPtm(),
                        seModMatch.isVariable(),
                        seModMatch.getModificationSite()));
              }
            }

            Peptide psPeptide = new Peptide(sePeptide.getSequence(), psModificationMatches);
            psPeptide.setParentProteins(psProteins);
            PeptideAssumption psAssumption =
                new PeptideAssumption(
                    psPeptide,
                    1,
                    Advocate.peptideShaker.getIndex(),
                    bestPeptideAssumption.getIdentificationCharge(),
                    retainedP);

            spectrumMatch.setBestPeptideAssumption(psAssumption);

            if (orderedPsmMap != null) {
              String peptideKey = psPeptide.getMatchingKey(sequenceMatchingPreferences);
              ArrayList<String> spectrumKeys = keysMap.get(peptideKey);
              if (spectrumKeys == null) {
                spectrumKeys = new ArrayList<String>();
                keysMap.put(peptideKey, spectrumKeys);
              }
              spectrumKeys.add(spectrumKey);
            }

            psParameter = new PSParameter();
            psParameter.setSpectrumProbabilityScore(retainedP);

            PSParameter matchParameter =
                (PSParameter) bestPeptideAssumption.getUrParam(psParameter);
            psParameter.setSearchEngineProbability(matchParameter.getSearchEngineProbability());
            psParameter.setAlgorithmDeltaPEP(matchParameter.getAlgorithmDeltaPEP());
            psParameter.setDeltaPEP(matchParameter.getDeltaPEP());

            matchesValidator
                .getPsmMap()
                .addPoint(
                    psParameter.getPsmProbabilityScore(),
                    spectrumMatch,
                    sequenceMatchingPreferences);
            psParameter.setSpecificMapKey(
                spectrumMatch.getBestPeptideAssumption().getIdentificationCharge().value + "");
            identification.addSpectrumMatchParameter(spectrumKey, psParameter);
            identification.updateSpectrumMatch(spectrumMatch);
          }
        }
        if (!tagAssumptions.isEmpty()) {
          ArrayList<Double> evalues = new ArrayList<Double>(tagAssumptions.keySet());
          Double bestEvalue = Collections.min(evalues);
          TagAssumption bestAssumption = tagAssumptions.get(bestEvalue).get(0);
          spectrumMatch.setBestTagAssumption(bestAssumption);
          identification.updateSpectrumMatch(spectrumMatch);
          if (spectrumMatch.getBestPeptideAssumption() == null) {
            psParameter = new PSParameter();
            if (!multiSE) {
              psParameter.setSpectrumProbabilityScore(bestEvalue);
            }
            PSParameter matchParameter = (PSParameter) bestAssumption.getUrParam(psParameter);
            psParameter.setSearchEngineProbability(matchParameter.getSearchEngineProbability());
            psParameter.setAlgorithmDeltaPEP(matchParameter.getAlgorithmDeltaPEP());
            psParameter.setDeltaPEP(matchParameter.getDeltaPEP());
            psParameter.setSpecificMapKey(
                spectrumMatch.getBestTagAssumption().getIdentificationCharge().value + "");
            identification.addSpectrumMatchParameter(spectrumKey, psParameter);
          }
        }
        waitingHandler.increaseSecondaryProgressCounter();
        if (waitingHandler.isRunCanceled()) {
          return;
        }
      }

      if (orderedPsmMap != null) {
        ArrayList<String> orderedKeys =
            new ArrayList<String>(
                identification.getSpectrumIdentification(spectrumFileName).size());
        for (ArrayList<String> keys : keysMap.values()) {
          orderedKeys.addAll(keys);
        }
        orderedPsmMap.put(spectrumFileName, orderedKeys);

        if (MemoryConsumptionStatus.memoryUsed() > 0.9) {
          orderedPsmMap = null;
        }
      }
    }

    if (orderedPsmMap != null) {
      metrics.setOrderedSpectrumKeys(orderedPsmMap);
    }

    // the protein count map is no longer needed
    proteinCount.clear();

    waitingHandler.setSecondaryProgressCounterIndeterminate(true);
  }
  /**
   * Indicates whether the match designated by the match key validates the given item using the
   * given comparator and value threshold.
   *
   * @param itemName the name of the item to filter on
   * @param filterItemComparator the comparator to use
   * @param value the value to use as a threshold
   * @param spectrumKey the key of the match of interest
   * @param peptideAssumption the assumption to validate
   * @param identification the identification objects where to get identification matches from
   * @param identificationFeaturesGenerator the identification feature generator where to get
   *     identification features
   * @param identificationParameters the identification parameters used
   * @param peptideSpectrumAnnotator the annotator to use to annotate spectra when filtering on PSM
   *     or assumptions
   * @return a boolean indicating whether the match designated by the protein key validates the
   *     given item using the given comparator and value threshold.
   * @throws java.io.IOException exception thrown whenever an exception occurred while reading or
   *     writing a file
   * @throws java.lang.InterruptedException exception thrown whenever a threading issue occurred
   *     while validating that the match passes the filter
   * @throws java.lang.ClassNotFoundException exception thrown whenever an error occurred while
   *     deserilalizing a match
   * @throws java.sql.SQLException exception thrown whenever an error occurred while interacting
   *     with a database
   * @throws uk.ac.ebi.jmzml.xml.io.MzMLUnmarshallerException exception thrown whenever an error
   *     occurred while reading an mzML file
   * @throws org.apache.commons.math.MathException exception thrown whenever an error occurred while
   *     doing statistics on a distribution
   */
  public boolean isValidated(
      String itemName,
      FilterItemComparator filterItemComparator,
      Object value,
      String spectrumKey,
      PeptideAssumption peptideAssumption,
      Identification identification,
      IdentificationFeaturesGenerator identificationFeaturesGenerator,
      IdentificationParameters identificationParameters,
      PeptideSpectrumAnnotator peptideSpectrumAnnotator)
      throws IOException, InterruptedException, ClassNotFoundException, SQLException,
          MzMLUnmarshallerException, MathException {

    AssumptionFilterItem filterItem = AssumptionFilterItem.getItem(itemName);
    if (filterItem == null) {
      throw new IllegalArgumentException(
          "Filter item " + itemName + "not recognized as spectrum assumption filter item.");
    }
    String input = value.toString();
    switch (filterItem) {
      case precrusorMz:
        Precursor precursor = SpectrumFactory.getInstance().getPrecursor(spectrumKey);
        Double mz = precursor.getMz();
        return filterItemComparator.passes(input, mz.toString());
      case precrusorRT:
        precursor = SpectrumFactory.getInstance().getPrecursor(spectrumKey);
        Double rt = precursor.getRt();
        return filterItemComparator.passes(input, rt.toString());
      case precrusorCharge:
        Integer charge = peptideAssumption.getIdentificationCharge().value;
        return filterItemComparator.passes(input, charge.toString());
      case precrusorMzErrorDa:
        precursor = SpectrumFactory.getInstance().getPrecursor(spectrumKey);
        SearchParameters searchParameters = identificationParameters.getSearchParameters();
        Double mzError =
            Math.abs(
                peptideAssumption.getDeltaMass(
                    precursor.getMz(),
                    false,
                    searchParameters.getMinIsotopicCorrection(),
                    searchParameters.getMaxIsotopicCorrection()));
        return filterItemComparator.passes(input, mzError.toString());
      case precrusorMzErrorPpm:
        searchParameters = identificationParameters.getSearchParameters();
        precursor = SpectrumFactory.getInstance().getPrecursor(spectrumKey);
        mzError =
            Math.abs(
                peptideAssumption.getDeltaMass(
                    precursor.getMz(),
                    true,
                    searchParameters.getMinIsotopicCorrection(),
                    searchParameters.getMaxIsotopicCorrection()));
        return filterItemComparator.passes(input, mzError.toString());
      case precrusorMzErrorStat:
        searchParameters = identificationParameters.getSearchParameters();
        precursor = SpectrumFactory.getInstance().getPrecursor(spectrumKey);
        mzError =
            peptideAssumption.getDeltaMass(
                precursor.getMz(),
                identificationParameters.getSearchParameters().isPrecursorAccuracyTypePpm(),
                searchParameters.getMinIsotopicCorrection(),
                searchParameters.getMaxIsotopicCorrection());
        NonSymmetricalNormalDistribution precDeviationDistribution =
            identificationFeaturesGenerator.getMassErrorDistribution(
                Spectrum.getSpectrumFile(spectrumKey));
        Double p;
        if (mzError > precDeviationDistribution.getMean()) {
          p = precDeviationDistribution.getDescendingCumulativeProbabilityAt(mzError);
        } else {
          p = precDeviationDistribution.getCumulativeProbabilityAt(mzError);
        }
        return filterItemComparator.passes(input, p.toString());
      case sequenceCoverage:
        SpectrumFactory spectrumFactory = SpectrumFactory.getInstance();
        MSnSpectrum spectrum = (MSnSpectrum) spectrumFactory.getSpectrum(spectrumKey);
        Peptide peptide = peptideAssumption.getPeptide();
        AnnotationSettings annotationPreferences =
            identificationParameters.getAnnotationPreferences();
        SpecificAnnotationSettings specificAnnotationPreferences =
            annotationPreferences.getSpecificAnnotationPreferences(
                spectrum.getSpectrumKey(),
                peptideAssumption,
                identificationParameters.getSequenceMatchingPreferences(),
                identificationParameters
                    .getPtmScoringPreferences()
                    .getSequenceMatchingPreferences());
        HashMap<Integer, ArrayList<IonMatch>> matches =
            peptideSpectrumAnnotator.getCoveredAminoAcids(
                annotationPreferences,
                specificAnnotationPreferences,
                (MSnSpectrum) spectrum,
                peptide);
        double nCovered = 0;
        int nAA = peptide.getSequence().length();
        for (int i = 0; i <= nAA; i++) {
          ArrayList<IonMatch> matchesAtAa = matches.get(i);
          if (matchesAtAa != null && !matchesAtAa.isEmpty()) {
            nCovered++;
          }
        }
        Double coverage = 100.0 * nCovered / nAA;
        return filterItemComparator.passes(input, coverage.toString());
      case algorithmScore:
        Double score = peptideAssumption.getRawScore();
        if (score == null) {
          score = peptideAssumption.getScore();
        }
        return filterItemComparator.passes(input, score.toString());
      case fileNames:
        return filterItemComparator.passes(input, Spectrum.getSpectrumFile(spectrumKey));
      case confidence:
        PSParameter psParameter = new PSParameter();
        psParameter =
            (PSParameter) identification.getPeptideMatchParameter(spectrumKey, psParameter);
        Double confidence = psParameter.getProteinConfidence();
        return filterItemComparator.passes(input, confidence.toString());
      case validationStatus:
        psParameter = new PSParameter();
        psParameter =
            (PSParameter) identification.getPeptideMatchParameter(spectrumKey, psParameter);
        Integer validation = psParameter.getMatchValidationLevel().getIndex();
        return filterItemComparator.passes(input, validation.toString());
      case stared:
        psParameter = new PSParameter();
        psParameter =
            (PSParameter) identification.getPeptideMatchParameter(spectrumKey, psParameter);
        String starred;
        if (psParameter.isStarred()) {
          starred = FilterItemComparator.trueFalse[0];
        } else {
          starred = FilterItemComparator.trueFalse[1];
        }
        return filterItemComparator.passes(input, starred);
      default:
        throw new IllegalArgumentException(
            "Protein filter not implemented for item " + filterItem.name + ".");
    }
  }