code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2013 Daniel Naber (http://www.danielnaber.de)
   * 
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.rules.de;
  
  import org.languagetool.AnalyzedToken;
  import org.languagetool.AnalyzedTokenReadings;
  import org.languagetool.JLanguageTool;
  import org.languagetool.tagging.de.AnalyzedGermanToken;
  import org.languagetool.tagging.de.GermanToken;
  
  /**
   * Helper methods for working with German POS tags.
   * @since 2.3
   */
  public final class GermanHelper {
  
    private GermanHelper() {
    }
  
    public static boolean hasReadingOfType(AnalyzedTokenReadings tokenReadings, GermanToken.POSType type) {
      if (tokenReadings == null) {
        return false;
      }
      for (AnalyzedToken token : tokenReadings) {
        if (token.getPOSTag() != null &&
            (token.getPOSTag().equals(JLanguageTool.SENTENCE_END_TAGNAME) ||
             token.getPOSTag().equals(JLanguageTool.PARAGRAPH_END_TAGNAME))) {
          return false;
        }
        AnalyzedGermanToken germanToken = new AnalyzedGermanToken(token);
        if (germanToken.getType() == type) {
          return true;
        }
      }
      return false;
    }
  
    /**
     * @since 2.4
     */
    public static String getNounCase(String posTag) {
      // input e.g. SUB:AKK:SIN:NEU
      return getIndexOrEmptyString(posTag, 1);
    }
  
    /**
     * @since 2.4
     */
    public static String getNounNumber(String posTag) {
      return getIndexOrEmptyString(posTag, 2);
    }
  
    /**
     * @since 2.4
     */
    public static String getNounGender(String posTag) {
      return getIndexOrEmptyString(posTag, 3);
    }
  
    /**
     * @since 2.4
     */
    public static String getDeterminerDefiniteness(String posTag) {
      // input e.g. ART:DEF:DAT:SIN:FEM
      return getIndexOrEmptyString(posTag, 1);
    }
  
    /**
     * @return GRU, KOM, or SUP
     * @since 5.4
     */
    public static String getComparison(String posTag) {
      // input e.g. ADJ:AKK:PLU:MAS:KOM:SOL
      String cmp = getIndexOrEmptyString(posTag, 4);
      if (!cmp.equals("GRU") && !cmp.equals("KOM") && !cmp.equals("SUP")) {
        // for cases like "PA2:PRD:GRU:VER"
        cmp = getIndexOrEmptyString(posTag, 2);
      }
      return cmp;
    }
  
    /**
     * @since 2.4
     */
    public static String getDeterminerCase(String posTag) {
      return getIndexOrEmptyString(posTag, 2);
    }
  
    /**
     * @since 2.4
     */
    public static String getDeterminerNumber(String posTag) {
      return getIndexOrEmptyString(posTag, 3);
    }
  
    /**
     * @since 2.4
     */
    public static String getDeterminerGender(String posTag) {
      return getIndexOrEmptyString(posTag, 4);
    }
  
    private static String getIndexOrEmptyString(String posTag, int idx) {
      if (posTag == null) {
        return "";
      }
      String[] array = posTag.split(":");
      if (array.length > idx) {
        return array[idx];
      } else {
        return "";
      }
    }
  
  }
  