Examples of org.apache.lucene.document.Field

org.apache.lucene.document.Field
A field is a section of a Document. Each field has two parts, a name and a value. Values may be free text, provided as a String or as a Reader, or they may be atomic keywords, which are not further processed. Such keywords may be used to represent dates, urls, etc. Fields are optionally stored in the index, so that they may be returned with hits on the document.

   */
  protected Field createEnumField(int fieldConstant, Enum<?> value, Store store) {
    if (value == null)
      return null;


    return new Field(String.valueOf(fieldConstant), String.valueOf(value.ordinal()), store, Index.UN_TOKENIZED);
  }

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  public Document getLuceneDocument() {
    Document document = new Document();
    document.add( createField(TITLE_FIELD_NAME,getTitle(), Field.Index.ANALYZED,4) );
    document.add( createField(DESCRIPTION_FIELD_NAME,getDescription(), Field.Index.ANALYZED,2) );
    document.add( createField(CONTENT_FIELD_NAME,getContent(), Field.Index.ANALYZED, 0.5f ) );
    document.add(new Field(RESOURCEURL_FIELD_NAME,getResourceUrl(), Field.Store.YES, Field.Index.NOT_ANALYZED) );//SET to ANALYZED
    document.add(new Field(DOCUMENTTYPE_FIELD_NAME,getDocumentType(), Field.Store.YES, Field.Index.NOT_ANALYZED) );
    if(getCssIcon() != null)
      document.add(new Field(CSS_ICON,getCssIcon(), Field.Store.YES, Field.Index.NOT_ANALYZED) );
    document.add(new Field(FILETYPE_FIELD_NAME,getFileType(), Field.Store.YES, Field.Index.NOT_ANALYZED) );
    document.add( createField(AUTHOR_FIELD_NAME,getAuthor(), Field.Index.ANALYZED, 2) );
      try {
        if(getCreatedDate() != null) {
          document.add(new Field(CREATED_FIELD_NAME,DateTools.dateToString(getCreatedDate(), DateTools.Resolution.DAY), Field.Store.YES, Field.Index.ANALYZED) );
        }
      }catch (Exception ex) {
        // No createdDate set => does not add field
      }
      try {
        if(getLastChange() != null) {
        document.add(new Field(CHANGED_FIELD_NAME,DateTools.dateToString(getLastChange(), DateTools.Resolution.DAY), Field.Store.YES, Field.Index.ANALYZED) );
        }
      }catch (Exception ex) {
        // No changedDate set => does not add field
      }
      try {
        if(getTimestamp() != null) {
        document.add(new Field(TIME_STAMP_NAME,DateTools.dateToString(getTimestamp(), DateTools.Resolution.MILLISECOND), Field.Store.YES, Field.Index.NO) );
        }
      }catch (Exception ex) {
        // No changedDate set => does not add field
      }
      // Add various metadata
      if (metadata != null) {
        for (Entry<String, List<String>> metaDataEntry : metadata.entrySet()) {
          String key = metaDataEntry.getKey();
          List<String> values = metaDataEntry.getValue();
          for (String value : values) {
            //FIXME:FG: tokenized or not? which priority
            document.add( createField(key, value, Field.Index.ANALYZED, 2) );
          }
        }
      }
      document.add(new Field(PARENT_CONTEXT_TYPE_FIELD_NAME,getParentContextType(), Field.Store.YES, Field.Index.ANALYZED) );
      document.add(new Field(PARENT_CONTEXT_NAME_FIELD_NAME,getParentContextName(), Field.Store.YES, Field.Index.ANALYZED) );
      return document;
  }

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      return document;
  }




  private Field createField(String fieldName, String content, Field.Index fieldIndex, float wight) {
    Field field = new Field(fieldName,content, Field.Store.YES, fieldIndex);
    field.setBoost(wight);
    return field;
  }

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                  Integer.MAX_VALUE))
              .setOpenMode(OpenMode.CREATE));
      queryParser = new QueryParser(Version.LUCENE_31, "text", analyzer);
      queryParser.setDefaultOperator(QueryParser.AND_OPERATOR);


      fulltext = new Field("text", "", Field.Store.NO,
          Field.Index.ANALYZED);
      fulltext.setOmitTermFreqAndPositions(true);


      // Used as base-set for a NOT-Query
      inverse = new Field("true", "yes", Field.Store.NO,
          Field.Index.ANALYZED);
      inverse.setOmitTermFreqAndPositions(true);


      document = new Document();
      document.add(fulltext);

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    return result;
  }
  
  private Document createDocument(String content) {
    Document doc = new Document();
    doc.add(new Field(FIELD_NAME, content, Field.Store.NO, Field.Index.TOKENIZED, Field.TermVector.WITH_POSITIONS));
    return doc;
  }

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  private MemoryIndex createMemoryIndex(Document doc) {
    MemoryIndex index = new MemoryIndex();
    Enumeration iter = doc.fields();
    while (iter.hasMoreElements()) {
      Field field = (Field) iter.nextElement();
      index.addField(field.name(), field.stringValue(), analyzer);
    }
    return index;
  }

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    throws ClassNotFoundException, IOException, IllegalArgumentException,
             NoSuchFieldException, IllegalAccessException, InstantiationException,
             NullPointerException {


    Document oDoc = new Document();
    oDoc.add (new Field("workarea" , contact.getWorkarea(), Field.Store.YES, Field.Index.UN_TOKENIZED));
    oDoc.add (new Field("guid"     , contact.getGui() , Field.Store.YES, Field.Index.UN_TOKENIZED));
    oDoc.add (new Field("author"   , contact.getAuthor() , Field.Store.YES, Field.Index.UN_TOKENIZED));
    oDoc.add (new Field("value"    , contact.getValue(), Field.Store.YES, Field.Index.TOKENIZED));
    oIWrt.addDocument(oDoc);
  } // addBug

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      if (sTitle==null) sTitle = "untitled";
    }


    Document oDoc = new Document();


    oDoc.add (new Field("subpath", sRelativePath, Field.Store.YES, Field.Index.UN_TOKENIZED));
    oDoc.add (new Field("name", sName, Field.Store.YES, Field.Index.UN_TOKENIZED));
    oDoc.add (new Field("title", sTitle, Field.Store.YES, Field.Index.TOKENIZED));
    oDoc.add (new Field("text" , Util.substitute(oMatcher, oTagPattern, new StringSubstitution(""), sHTMLText, Util.SUBSTITUTE_ALL), Field.Store.NO, Field.Index.TOKENIZED));


    return oDoc;
  } // makeHTMLDocument

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    Directory ramDir = new RAMDirectory();
    try {
      IndexWriter writer = new IndexWriter(ramDir, /*new StandardAnalyzer()/*/XFactory.getWriterAnalyzer());
      Document doc = new Document();
      Field fd = new Field(FIELD_NAME, CONTENT, Field.Store.YES, Field.Index.TOKENIZED,Field.TermVector.WITH_POSITIONS_OFFSETS);
      doc.add(fd);
      writer.addDocument(doc);
      writer.optimize();
      writer.close();

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    //接下来是标准的Lucene建立索引和检索的代码
    Directory ramDir = new RAMDirectory();
    IndexWriter writer = new IndexWriter(ramDir, analyzer, MaxFieldLength.UNLIMITED);
    Document doc = new Document();
    Field fd = new Field(FIELD_NAME, content, Field.Store.YES,
        Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS);
    doc.add(fd);
    writer.addDocument(doc);
    writer.optimize();
    writer.close();

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