Examples of org.apache.lucene.index.IndexReader

org.apache.lucene.index.IndexReader
IndexReader is an abstract class, providing an interface for accessing an index. Search of an index is done entirely through this abstract interface, so that any subclass which implements it is searchable.
Concrete subclasses of IndexReader are usually constructed with a call to one of the static open() methods, e.g. {@link #open(Directory,boolean)}.
For efficiency, in this API documents are often referred to via document numbers, non-negative integers which each name a unique document in the index. These document numbers are ephemeral--they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions.
An IndexReader can be opened on a directory for which an IndexWriter is opened already, but it cannot be used to delete documents from the index then.
NOTE: for backwards API compatibility, several methods are not listed as abstract, but have no useful implementations in this base class and instead always throw UnsupportedOperationException. Subclasses are strongly encouraged to override these methods, but in many cases may not need to.

NOTE: as of 2.4, it's possible to open a read-only IndexReader using the static open methods that accept the boolean readOnly parameter. Such a reader has better concurrency as it's not necessary to synchronize on the isDeleted method. You must specify false if you want to make changes with the resulting IndexReader.

NOTE: {@link IndexReader} instances are completely threadsafe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexReader instance; use your own (non-Lucene) objects instead.

      Document[] data= createDataTwo();
      
      TestDataDigester testDigester=new TestDataDigester(_facetHandlers,data);
      BoboIndexer indexer=new BoboIndexer(testDigester,dir);
      indexer.index();
      IndexReader r = IndexReader.open(dir,false);
      r.close();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

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      Document[] data= createData();
      
      TestDataDigester testDigester=new TestDataDigester(_facetHandlers,data);
      BoboIndexer indexer=new BoboIndexer(testDigester,dir);
      indexer.index();
      IndexReader r = IndexReader.open(dir,false);
      r.close();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

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    BrowseResult result = null;
    BoboBrowser boboBrowser=null;
    int expectedHitNum = (_documentSize/2) - 1;
    try {
      Directory ramIndexDir = createIndex();
      IndexReader srcReader=IndexReader.open(ramIndexDir,true);
      boboBrowser = new BoboBrowser(BoboIndexReader.getInstance(srcReader,_facetHandlers, null));
      result = boboBrowser.browse(br);
      
      assertEquals(expectedHitNum,result.getNumHits());

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    BrowseResult result = null;
    BoboBrowser boboBrowser=null;
    
    try {
      Directory ramIndexDir = createIndexTwo();
      IndexReader srcReader=IndexReader.open(ramIndexDir,true);
      boboBrowser = new BoboBrowser(BoboIndexReader.getInstance(srcReader,_facetHandlers, null));
      
      BrowseRequest br=new BrowseRequest();
      br.setCount(20);
      br.setOffset(0);

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      Document[] data= createData();
      
      TestDataDigester testDigester=new TestDataDigester(_facetHandlers,data);
      BoboIndexer indexer=new BoboIndexer(testDigester,dir);
      indexer.index();
      IndexReader r = IndexReader.open(dir,false);
      r.close();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }

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    BrowseResult result = null;
    BoboBrowser boboBrowser=null;
    int expectedHitNum = 3;
    try {
      Directory ramIndexDir = createIndex();
      IndexReader srcReader=IndexReader.open(ramIndexDir,true);
      boboBrowser = new BoboBrowser(BoboIndexReader.getInstance(srcReader,_facetHandlers, null));
      result = boboBrowser.browse(br);
      
      assertEquals(expectedHitNum,result.getNumHits());
    } catch (BrowseException e) {

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  public void digest(DataHandler handler) throws IOException {
    int numcars=getMaxDocs();
    Random rand=new Random();
        
    IndexReader reader=null;
    try{
      reader=IndexReader.open(FSDirectory.open(getDataFile()),true);
      int carcount=reader.maxDoc();
      
      Document[] docCache=new Document[carcount];
      for (int i=0;i<carcount;++i){
        docCache[i]=reader.document(i);
      }
      
      for (int i=0;i<numcars;++i){
        if (i!=0 && i%1000==0){
          System.out.println(i+" cars indexed.");
        }
        Document doc=new Document();
        int n=rand.nextInt(10);
        if (n==0){
          makeCar(doc,cars[rand.nextInt(cars.length)]);          
        }
        else{
          Document srcDoc=docCache[rand.nextInt(carcount)];
          makeCar(doc,srcDoc);          
        }
        
        populateDocument(doc,null);                                
        handler.handleDocument(doc);        
      }
    }
    finally{
      if (reader!=null){
        reader.close();
      }
    }
  }

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public class IndexDumper {
  private BoboIndexReader _reader;
  private int curr_docid=0;
  private int maxdoc;
  public IndexDumper(File idxDir) throws IOException{
    IndexReader idxReader=IndexReader.open(FSDirectory.open(idxDir),true);
    if (idxReader!=null){
      try{
        _reader=BoboIndexReader.getInstance(idxReader);
        maxdoc=_reader.maxDoc();
      }
      catch(Exception e){
        e.printStackTrace();
        maxdoc=0;
        idxReader.close();
      }
    }
  }

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    File outfile = new File(_outDir,"facetvals.txt");
    BufferedOutputStream ostream = new BufferedOutputStream(new FileOutputStream(outfile));
    PrintWriter writer = new PrintWriter(new OutputStreamWriter(ostream,"UTF-8"));
    
    IndexReader reader=IndexReader.open(_idxDir);
    BoboIndexReader boboReader = BoboIndexReader.getInstance(reader);
    
    Set<String> fieldNames = boboReader.getFacetNames();
    for (String fieldName : fieldNames)
    {
      TermEnum te = reader.terms(new Term(fieldName,""));
      while(te.next())
      {
        Term t = te.term();
        if (!fieldName.equals(t.field())) break;
        writer.println(t.field()+":"+t.text());

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    }
    
    Thread.sleep(10000);
    
    File indexDir = manager.getIndexDirectory();
    IndexReader indexReader = IndexReader.open(indexDir);
    String[] words = suggest.suggest("test", indexReader, DocumentCreator.FIELD_TEXT);
    assertEquals(0,words.length);
  
    words = suggest.suggest("full",indexReader,DocumentCreator.FIELD_TEXT);
    assertEquals(1,words.length);

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