Java MultiFields.getTerms方法代碼示例

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
/**
 * Creates a new QueryAutoStopWordAnalyzer with stopwords calculated for the
 * given selection of fields from terms with a document frequency greater than
 * the given maxDocFreq
 *
 * @param delegate Analyzer whose TokenStream will be filtered
 * @param indexReader IndexReader to identify the stopwords from
 * @param fields Selection of fields to calculate stopwords for
 * @param maxDocFreq Document frequency terms should be above in order to be stopwords
 * @throws IOException Can be thrown while reading from the IndexReader
 */
public QueryAutoStopWordAnalyzer(
    Analyzer delegate,
    IndexReader indexReader,
    Collection<String> fields,
    int maxDocFreq) throws IOException {
  super(delegate.getReuseStrategy());
  this.delegate = delegate;
  
  for (String field : fields) {
    Set<String> stopWords = new HashSet<>();
    Terms terms = MultiFields.getTerms(indexReader, field);
    CharsRefBuilder spare = new CharsRefBuilder();
    if (terms != null) {
      TermsEnum te = terms.iterator(null);
      BytesRef text;
      while ((text = te.next()) != null) {
        if (te.docFreq() > maxDocFreq) {
          spare.copyUTF8Bytes(text);
          stopWords.add(spare.toString());
        }
      }
    }
    stopWordsPerField.put(field, stopWords);
  }
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
public void visitMatchingTerms(
  IndexReader reader,
  String fieldName,
  MatchingTermVisitor mtv) throws IOException
{
  /* check term presence in index here for symmetry with other SimpleTerm's */
  Terms terms = MultiFields.getTerms(reader, fieldName);
  if (terms != null) {
    TermsEnum termsEnum = terms.iterator(null);

    TermsEnum.SeekStatus status = termsEnum.seekCeil(new BytesRef(getTermText()));
    if (status == TermsEnum.SeekStatus.FOUND) {
      mtv.visitMatchingTerm(getLuceneTerm(fieldName));
    }
  }
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
protected FieldStatsShardResponse shardOperation(FieldStatsShardRequest request) {
    ShardId shardId = request.shardId();
    Map<String, FieldStats> fieldStats = new HashMap<>();
    IndexService indexServices = indicesService.indexServiceSafe(shardId.getIndex());
    MapperService mapperService = indexServices.mapperService();
    IndexShard shard = indexServices.shardSafe(shardId.id());
    try (Engine.Searcher searcher = shard.acquireSearcher("fieldstats")) {
        for (String field : request.getFields()) {
            MappedFieldType fieldType = mapperService.fullName(field);
            if (fieldType != null) {
                IndexReader reader = searcher.reader();
                Terms terms = MultiFields.getTerms(reader, field);
                if (terms != null) {
                    fieldStats.put(field, fieldType.stats(terms, reader.maxDoc()));
                }
            } else {
                throw new IllegalArgumentException("field [" + field + "] doesn't exist");
            }
        }
    } catch (IOException e) {
        throw ExceptionsHelper.convertToElastic(e);
    }
    return new FieldStatsShardResponse(shardId, fieldStats);
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
/**
 * {@inheritDoc}
 */
@Override
public ClassificationResult<BytesRef> assignClass(String inputDocument) throws IOException {
  if (atomicReader == null) {
    throw new IOException("You must first call Classifier#train");
  }
  double max = - Double.MAX_VALUE;
  BytesRef foundClass = new BytesRef();

  Terms terms = MultiFields.getTerms(atomicReader, classFieldName);
  TermsEnum termsEnum = terms.iterator(null);
  BytesRef next;
  String[] tokenizedDoc = tokenizeDoc(inputDocument);
  while ((next = termsEnum.next()) != null) {
    double clVal = calculateLogPrior(next) + calculateLogLikelihood(tokenizedDoc, next);
    if (clVal > max) {
      max = clVal;
      foundClass = BytesRef.deepCopyOf(next);
    }
  }
  double score = 10 / Math.abs(max);
  return new ClassificationResult<>(foundClass, score);
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
private int countTerms(MultiTermQuery q) throws Exception {
  final Terms terms = MultiFields.getTerms(reader, q.getField());
  if (terms == null)
    return 0;
  final TermsEnum termEnum = q.getTermsEnum(terms);
  assertNotNull(termEnum);
  int count = 0;
  BytesRef cur, last = null;
  while ((cur = termEnum.next()) != null) {
    count++;
    if (last != null) {
      assertTrue(last.compareTo(cur) < 0);
    }
    last = BytesRef.deepCopyOf(cur);
  } 
  // LUCENE-3314: the results after next() already returned null are undefined,
  // assertNull(termEnum.next());
  return count;
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
public void testAllDocs() throws Exception {
  initializeIndex(new String[]{"A", "B", "C", "D"});
  IndexReader reader = DirectoryReader.open(dir);
  IndexSearcher searcher = newSearcher(reader);
  TermRangeQuery query = new TermRangeQuery("content", null, null, true, true);
  Terms terms = MultiFields.getTerms(searcher.getIndexReader(), "content");
  assertFalse(query.getTermsEnum(terms) instanceof TermRangeTermsEnum);
  assertEquals(4, searcher.search(query, null, 1000).scoreDocs.length);
  query = new TermRangeQuery("content", null, null, false, false);
  assertFalse(query.getTermsEnum(terms) instanceof TermRangeTermsEnum);
  assertEquals(4, searcher.search(query, null, 1000).scoreDocs.length);
  query = TermRangeQuery.newStringRange("content", "", null, true, false);
  assertFalse(query.getTermsEnum(terms) instanceof TermRangeTermsEnum);
  assertEquals(4, searcher.search(query, null, 1000).scoreDocs.length);
  // and now anothe one
  query = TermRangeQuery.newStringRange("content", "B", null, true, false);
  assertTrue(query.getTermsEnum(terms) instanceof TermRangeTermsEnum);
  assertEquals(3, searcher.search(query, null, 1000).scoreDocs.length);
  reader.close();
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
/**
 * Tests if a WildcardQuery that has only a trailing * in the term is
 * rewritten to a single PrefixQuery. The boost and rewriteMethod should be
 * preserved.
 */
public void testPrefixTerm() throws IOException {
  Directory indexStore = getIndexStore("field", new String[]{"prefix", "prefixx"});
  IndexReader reader = DirectoryReader.open(indexStore);
  IndexSearcher searcher = newSearcher(reader);

  MultiTermQuery wq = new WildcardQuery(new Term("field", "prefix*"));
  assertMatches(searcher, wq, 2);
  Terms terms = MultiFields.getTerms(searcher.getIndexReader(), "field");
  assertTrue(wq.getTermsEnum(terms) instanceof PrefixTermsEnum);
  
  wq = new WildcardQuery(new Term("field", "*"));
  assertMatches(searcher, wq, 2);
  assertFalse(wq.getTermsEnum(terms) instanceof PrefixTermsEnum);
  assertFalse(wq.getTermsEnum(terms).getClass().getSimpleName().contains("AutomatonTermsEnum"));
  reader.close();
  indexStore.close();
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
/**
 * {@inheritDoc}
 */
@Override
public ClassificationResult<BytesRef> assignClass(String inputDocument) throws IOException {
  if (atomicReader == null) {
    throw new IOException("You must first call Classifier#train");
  }
  double max = - Double.MAX_VALUE;
  BytesRef foundClass = new BytesRef();

  Terms terms = MultiFields.getTerms(atomicReader, classFieldName);
  TermsEnum termsEnum = terms.iterator(null);
  BytesRef next;
  String[] tokenizedDoc = tokenizeDoc(inputDocument);
  while ((next = termsEnum.next()) != null) {
    double clVal = calculateLogPrior(next) + calculateLogLikelihood(tokenizedDoc, next);
    if (clVal > max) {
      max = clVal;
      foundClass = BytesRef.deepCopyOf(next);
    }
  }
  double score = 10 / Math.abs(max);
  return new ClassificationResult<BytesRef>(foundClass, score);
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
public void visitMatchingTerms(
  IndexReader reader,
  String fieldName,
  MatchingTermVisitor mtv) throws IOException
{
  int prefixLength = prefix.length();
  Terms terms = MultiFields.getTerms(reader, fieldName);
  if (terms != null) {
    Matcher matcher = pattern.matcher("");
    try {
      TermsEnum termsEnum = terms.iterator(null);

      TermsEnum.SeekStatus status = termsEnum.seekCeil(prefixRef);
      BytesRef text;
      if (status == TermsEnum.SeekStatus.FOUND) {
        text = prefixRef;
      } else if (status == TermsEnum.SeekStatus.NOT_FOUND) {
        text = termsEnum.term();
      } else {
        text = null;
      }

      while(text != null) {
        if (text != null && StringHelper.startsWith(text, prefixRef)) {
          String textString = text.utf8ToString();
          matcher.reset(textString.substring(prefixLength));
          if (matcher.matches()) {
            mtv.visitMatchingTerm(new Term(fieldName, textString));
          }
        } else {
          break;
        }
        text = termsEnum.next();
      }
    } finally {
      matcher.reset();
    }
  }
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
public void visitMatchingTerms(
  IndexReader reader,
  String fieldName,
  MatchingTermVisitor mtv) throws IOException
{
  /* inspired by PrefixQuery.rewrite(): */
  Terms terms = MultiFields.getTerms(reader, fieldName);
  if (terms != null) {
    TermsEnum termsEnum = terms.iterator(null);

    boolean skip = false;
    TermsEnum.SeekStatus status = termsEnum.seekCeil(new BytesRef(getPrefix()));
    if (status == TermsEnum.SeekStatus.FOUND) {
      mtv.visitMatchingTerm(getLucenePrefixTerm(fieldName));
    } else if (status == TermsEnum.SeekStatus.NOT_FOUND) {
      if (StringHelper.startsWith(termsEnum.term(), prefixRef)) {
        mtv.visitMatchingTerm(new Term(fieldName, termsEnum.term().utf8ToString()));
      } else {
        skip = true;
      }
    } else {
      // EOF
      skip = true;
    }

    if (!skip) {
      while(true) {
        BytesRef text = termsEnum.next();
        if (text != null && StringHelper.startsWith(text, prefixRef)) {
          mtv.visitMatchingTerm(new Term(fieldName, text.utf8ToString()));
        } else {
          break;
        }
      }
    }
  }
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
/**
 * Test handling of the empty language
 */
public void testEmptyOptimization() throws IOException {
  AutomatonQuery aq = new AutomatonQuery(newTerm("bogus"), Automata.makeEmpty());
  // not yet available: assertTrue(aq.getEnum(searcher.getIndexReader())
  // instanceof EmptyTermEnum);
  Terms terms = MultiFields.getTerms(searcher.getIndexReader(), FN);
  assertSame(TermsEnum.EMPTY, aq.getTermsEnum(terms));
  assertEquals(0, automatonQueryNrHits(aq));
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException
{
  final BinaryDocValues terms = cache.getTerms(readerContext.reader(), field, false, PackedInts.FAST);
  final IndexReader top = ReaderUtil.getTopLevelContext(readerContext).reader();
  Terms t = MultiFields.getTerms(top, qfield);
  final TermsEnum termsEnum = t == null ? TermsEnum.EMPTY : t.iterator(null);
  
  return new IntDocValues(this) {

    @Override
    public int intVal(int doc) 
    {
      try {
        final BytesRef term = terms.get(doc);
        if (termsEnum.seekExact(term)) {
          return termsEnum.docFreq();
        } else {
          return 0;
        }
      } 
      catch (IOException e) {
        throw new RuntimeException("caught exception in function "+description()+" : doc="+doc, e);
      }
    }
  };
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
@Override
public final InputIterator getEntryIterator() throws IOException {
  final Terms terms = MultiFields.getTerms(reader, field);
  if (terms != null) {
    return new InputIterator.InputIteratorWrapper(terms.iterator(null));
  } else {
    return InputIterator.EMPTY;
  }
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
HighFrequencyIterator() throws IOException {
  Terms terms = MultiFields.getTerms(reader, field);
  if (terms != null) {
    termsEnum = terms.iterator(null);
  } else {
    termsEnum = null;
  }
  minNumDocs = (int)(thresh * (float)reader.numDocs());
}
 

import org.apache.lucene.index.MultiFields; //導入方法依賴的package包/類
private double getTextTermFreqForClass(BytesRef c) throws IOException {
  double avgNumberOfUniqueTerms = 0;
  for (String textFieldName : textFieldNames) {
    Terms terms = MultiFields.getTerms(atomicReader, textFieldName);
    long numPostings = terms.getSumDocFreq(); // number of term/doc pairs
    avgNumberOfUniqueTerms += numPostings / (double) terms.getDocCount(); // avg # of unique terms per doc
  }
  int docsWithC = atomicReader.docFreq(new Term(classFieldName, c));
  return avgNumberOfUniqueTerms * docsWithC; // avg # of unique terms in text fields per doc * # docs with c
}