code: package org.languagetool.rules.uk;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import org.languagetool.AnalyzedToken;
  
  /**
   * @since 3.6
   */
  public class InflectionHelper {
  
    private InflectionHelper() {
    }
  
    public static class Inflection implements Comparable<Inflection> {
      final String gender;
      final String _case;
      final String animTag;
    
      Inflection(String gender, String _case, String animTag) {
        this.gender = gender;
        this._case = _case;
        this.animTag = animTag;
      }
    
      @Override
      public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((_case == null) ? 0 : _case.hashCode());
  //      result = prime * result + ((animTag == null) ? 0 : animTag.hashCode());
        result = prime * result + ((gender == null) ? 0 : gender.hashCode());
        return result;
      }
    
      @Override
      public boolean equals(Object obj) {
        if (this == obj)
          return true;
        if (obj == null)
          return false;
        if (getClass() != obj.getClass())
          return false;
    
        Inflection other = (Inflection) obj;
        return genderEquals(gender, other.gender)
            && _case.equals(other._case)
            && (animTag == null || other.animTag == null 
            || ! animMatters() || ! other.isAnimalSensitive() || animTag.equals(other.animTag));
      }
    
      private boolean genderEquals(String gender1, String gender2) {
        if( gender1.equals(gender2) )
          return true;
        
        if( gender1.equals("s") && gender2.matches("[mfn]") 
            || gender2.equals("s") && gender1.matches("[mfn]") )
          return true;
  
        return false;
      }
  
      public boolean equalsIgnoreGender(Inflection other) {
        return //gender.equals(other.gender)
            _case.equals(other._case)
            && (animTag == null || other.animTag == null 
            || ! animMatters() || animTag.equals(other.animTag));
      }
    
      boolean animMatters() {
        return animTag != null && ! "unanim".equals(animTag) && _case.equals("v_zna") && isAnimalSensitive();
      }
    
      private boolean isAnimalSensitive() {
        return "mp".contains(gender);
      }
    
      @Override
      public String toString() {
        return ":" + gender + ":" + _case
            + (animMatters() ? "_"+animTag : "");
      }
  
      @Override
      public int compareTo(Inflection o) {
        if( GEN_ORDER.get(gender) == null ) System.err.println ("unknown gender for " + gender + " for " + o);
        
        int compared = GEN_ORDER.get(gender).compareTo(GEN_ORDER.get(o.gender));
        if( compared != 0 )
          return compared;
        
        compared = VIDM_ORDER.get(_case).compareTo(VIDM_ORDER.get(o._case));
        return compared;
      }
    
    }
  
    public static List<Inflection> getAdjInflections(List<AnalyzedToken> adjTokenReadings) {
      return getAdjInflections(adjTokenReadings, "adj");
    }
  
    public static List<Inflection> getNumrInflections(List<AnalyzedToken> adjTokenReadings) {
      return getAdjInflections(adjTokenReadings, "numr");
    }
  
    public static List<Inflection> getAdjInflections(List<AnalyzedToken> adjTokenReadings, String postagStart) {
      List<Inflection> masterInflections = new ArrayList<>();
      for (AnalyzedToken token: adjTokenReadings) {
        String posTag = token.getPOSTag();
    
        if( posTag == null || ! posTag.startsWith(postagStart) )
          continue;
    
        Matcher matcher = TokenAgreementAdjNounRule.ADJ_INFLECTION_PATTERN.matcher(posTag);
        matcher.find();
    
        String gen = matcher.group(1);
        String vidm = matcher.group(2);
        String animTag = null;
        if (matcher.group(3) != null) {
          animTag = matcher.group(3).substring(2);	// :rinanim/:ranim
        }
    
        Inflection inflection = new Inflection(gen, vidm, animTag);
        if( ! masterInflections.contains(inflection) ) {
          masterInflections.add(inflection);
        }
      }
      return masterInflections;
    }
  
    static List<Inflection> getNounInflections(List<AnalyzedToken> nounTokenReadings) {
      return getNounInflections(nounTokenReadings, null);
    }
  
    public static List<Inflection> getNounInflections(List<AnalyzedToken> nounTokenReadings, Pattern ignoreTag) {
      List<Inflection> slaveInflections = new ArrayList<>();
      for (AnalyzedToken token: nounTokenReadings) {
        String posTag2 = token.getPOSTag();
        if( posTag2 == null )
          continue;
  
        if( ignoreTag != null && ignoreTag.matcher(posTag2).find() ) {
          continue;
        }
  
        Matcher matcher = TokenAgreementAdjNounRule.NOUN_INFLECTION_PATTERN.matcher(posTag2);
        if( ! matcher.find() ) {
          //  			System.err.println("Failed to find slave inflection tag in " + posTag2 + " for " + nounTokenReadings);
          continue;
        }
        String gen = matcher.group(2);
        String vidm = matcher.group(3);
        String animTag = matcher.group(1);
  
        Inflection inflection = new Inflection(gen, vidm, animTag);
        if( ! slaveInflections.contains(inflection) ) {
          slaveInflections.add(inflection);
        }
      }
      return slaveInflections;
    }
  
    static final Map<String,Integer> GEN_ORDER = new HashMap<>();
    private static final Map<String,Integer> VIDM_ORDER = new HashMap<>();
    
    static {
      GEN_ORDER.put("m", 0);
      GEN_ORDER.put("f", 1);
      GEN_ORDER.put("n", 3);
      GEN_ORDER.put("s", 4);      // for pron
      GEN_ORDER.put("p", 5);
      GEN_ORDER.put("i", 6);      // verb:inf
      GEN_ORDER.put("o", 7);      // verb:impers
  
      VIDM_ORDER.put("v_naz", 10);
      VIDM_ORDER.put("v_rod", 20);
      VIDM_ORDER.put("v_dav", 30);
      VIDM_ORDER.put("v_zna", 40);
      VIDM_ORDER.put("v_oru", 50);
      VIDM_ORDER.put("v_mis", 60);
      VIDM_ORDER.put("v_kly", 70);
    }
  
  }
  