public static int numFields(Document doc) 
{
    Enumeration fields = doc.fields();
    int result = 0;
    while (fields.hasMoreElements()) {
      fields.nextElement();
      result++;
    }
    return result;
}

 public static  void setupDoc(Document doc) 
{
  
    nameValues = new HashMap();
    nameValues.put(TEXT_FIELD_1_KEY, FIELD_1_TEXT);
    nameValues.put(TEXT_FIELD_2_KEY, FIELD_2_TEXT);
    nameValues.put(KEYWORD_FIELD_KEY, KEYWORD_TEXT);
    nameValues.put(UNINDEXED_FIELD_KEY, UNINDEXED_FIELD_TEXT);
    nameValues.put(UNSTORED_FIELD_1_KEY, UNSTORED_1_FIELD_TEXT);
    nameValues.put(UNSTORED_FIELD_2_KEY, UNSTORED_2_FIELD_TEXT);
    doc.add(textField1);
    doc.add(textField2);
    doc.add(keyField);
    doc.add(unIndField);
    doc.add(unStoredField1);
    doc.add(unStoredField2);
}

Adds the fields above to a document

 public static  void writeDoc(Directory dir,
    Document doc) 
{
    
    writeDoc(dir, "test", doc);
}

Writes the document to the directory using a segment named "test"

 public static  void writeDoc(Directory dir,
    String segment,
    Document doc) 
{
    Analyzer analyzer = new WhitespaceAnalyzer();
    Similarity similarity = Similarity.getDefault();
    writeDoc(dir, analyzer, similarity, segment, doc);
}

Writes the document to the directory in the given segment

 public static  void writeDoc(Directory dir,
    Analyzer analyzer,
    Similarity similarity,
    Document doc) 
{
    writeDoc(dir, analyzer, similarity, "test", doc);
}

Writes the document to the directory segment named "test" using the specified analyzer and similarity

 public static  void writeDoc(Directory dir,
    Analyzer analyzer,
    Similarity similarity,
    String segment,
    Document doc) 
{
    DocumentWriter writer = new DocumentWriter(dir, analyzer, similarity, 50);
    try {
      writer.addDocument(segment, doc);
    } catch (IOException e) {
      e.printStackTrace();
    }
}

Writes the document to the directory segment using the analyzer and the similarity score