content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.lucene.analysis.synonym;
  
  
  import org.apache.lucene.analysis.Analyzer;
  import org.apache.lucene.util.CharsRef;
  import org.apache.lucene.util.CharsRefBuilder;
  
  import java.io.IOException;
  import java.io.LineNumberReader;
  import java.io.Reader;
  import java.text.ParseException;
  import java.util.Arrays;
  
  /**
   * Parser for wordnet prolog format
   * <p>
   * See http://wordnet.princeton.edu/man/prologdb.5WN.html for a description of the format.
   *
   * @lucene.experimental
   */
  // TODO: allow you to specify syntactic categories (e.g. just nouns, etc)
  public class NewWordnetSynonymParser extends NewSynonymFilterFactory.SynonymParser {
      private final boolean expand;
  
      public NewWordnetSynonymParser(boolean dedup, boolean expand, Analyzer analyzer) {
          super(dedup, analyzer);
          this.expand = expand;
      }
  
      @Override
      public void parse(Reader in) throws IOException, ParseException {
          LineNumberReader br = new LineNumberReader(in);
          try {
              String line = null;
              String lastSynSetID = "";
              CharsRef[] synset = new CharsRef[8];
              int synsetSize = 0;
  
              while ((line = br.readLine()) != null) {
                  String synSetID = line.substring(2, 11);
  
                  if (!synSetID.equals(lastSynSetID)) {
                      addInternal(synset, synsetSize);
                      synsetSize = 0;
                  }
  
                  if (synset.length <= synsetSize + 1) {
                      synset = Arrays.copyOf(synset, synset.length * 2);
                  }
  
                  synset[synsetSize] = parseSynonym(line, new CharsRefBuilder());
                  synsetSize++;
                  lastSynSetID = synSetID;
              }
  
              // final synset in the file
              addInternal(synset, synsetSize);
          } catch (IllegalArgumentException e) {
              ParseException ex = new ParseException("Invalid synonym rule at line " + br.getLineNumber(), 0);
              ex.initCause(e);
              throw ex;
          } finally {
              br.close();
          }
      }
  
      private CharsRef parseSynonym(String line, CharsRefBuilder reuse) throws IOException {
          if (reuse == null) {
              reuse = new CharsRefBuilder();
          }
  
          int start = line.indexOf('\'') + 1;
          int end = line.lastIndexOf('\'');
  
          String text = line.substring(start, end).replace("''", "'");
          return analyze(text, reuse);
      }
  
      private void addInternal(CharsRef[] synset, int size) {
          if (size <= 1) {
              return; // nothing to do
          }
  
          if (expand) {
              for (int i = 0; i < size; i++) {
                  for (int j = 0; j < size; j++) {
                      add(synset[i], synset[j], false);
                  }
              }
          } else {
              for (int i = 0; i < size; i++) {
                  add(synset[i], synset[0], false);
              }
          }
      }
  }
  