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From Karl Øie <k...@gan.no>
Subject Re: Deleting documents from index question.
Date Mon, 17 Jun 2002 13:38:07 GMT
hi, i think you must run writer.optimize after deleting docs before it takes 
effect, deleted documents are only marked as deleted until then...


mvh karl øie

On Monday 17 June 2002 15:33, Rick Vestal wrote:
> Good morning all,
>
> I'm trying to delete a set of documents from an index,
> and am running into a problem where all the documents are
> not deleted.  My problem is either the way I am using the API
> or it is a bug in lucene...I'm not sure which one it is.
>
> I've included a sample program here that shows the problem.  Note
> that you will have to change the path at the top to a valid set
> of files on your machine.  If anybody has any ideas on why I
> am not removing the files correctly, please let me know.
>
> Thanks,
>
> -- Rick
>
> /*
>  * Created by IntelliJ IDEA.
>  * User: rvestal
>  * Date: Jun 16, 2002
>  * Time: 10:23:51 PM
>  * To change template for new class use
>  * Code Style | Class Templates options (Tools | IDE Options).
>  */
> package org.intellij.plugins.docPlugin;
>
> import org.apache.lucene.analysis.Analyzer;
> import org.apache.lucene.analysis.standard.StandardAnalyzer;
> import org.apache.lucene.document.*;
> import org.apache.lucene.index.*;
> import org.apache.lucene.queryParser.QueryParser;
> import org.apache.lucene.search.*;
> import org.apache.lucene.store.*;
>
> import java.io.*;
> import java.util.Vector;
>
> public class IndexTest {
>
>     // path to ant 1.4.1 docs
>     private static String mDirToIndex = "c:/utils/ant/docs/manual/api/";
>
>     private static String INDEX_DIR = "indexTest";
>
>
>     static private void collectFiles( File dir, Vector files ) {
>         File[] children = dir.listFiles();
>         for ( int ix = 0; ix < children.length; ix++ ) {
>             File child = children[ix];
>             if ( child.isDirectory() ) {
>                 collectFiles( child, files );
>             } else {
>                 files.add( child );
>             }
>         }
>     }
>
>
>     public static void main( String[] args ) {
>         File indexDir = new File( INDEX_DIR );
>         if ( !indexDir.exists() ) {
>             indexDir.mkdirs();
>         }
>
>         Vector files = new Vector();
>         collectFiles( new File( mDirToIndex ), files );
>
>         try {
>             IndexWriter writer = new IndexWriter( INDEX_DIR, new
> StandardAnalyzer(), true );
>
>             for ( int ix = 0; ix < files.size(); ix++ ) {
>                 File file = ( File ) files.get( ix );
>                 writer.addDocument( IndexTestDocument.createDocument(
> file ) );
>             }
>             System.out.println( "Added: " + files.size() + " files." );
>
>             writer.optimize();
>             writer.close();
>             writer = null;
>
>             Searcher searcher = new IndexSearcher( INDEX_DIR );
>             Analyzer analyzer = new StandardAnalyzer();
>             Query query = QueryParser.parse( "Ant", "contents", analyzer
> );
>
>             Hits hits = searcher.search( query );
>             System.out.println( "Hits after add: " + hits.length() );
>             searcher.close();
>
>             Directory directory = FSDirectory.getDirectory( INDEX_DIR,
> false );
>             IndexReader reader = IndexReader.open( directory );
>
>             int count = 0;
>             for ( int ix = 0; ix < files.size(); ix++ ) {
>                 String path = IndexTestDocument.normalizePath( ( ( File
> )
> files.get( ix ) ).getAbsolutePath().replace( '\\', '/' ) );
>
>                 int numDocs = reader.numDocs();
>                 boolean bDeleted = false;
>                 for ( int ndx = 0; ndx < numDocs; ndx++ ) {
>                     if ( !reader.isDeleted( ndx ) ) {
>                         String docPath = IndexTestDocument.getPath(
> reader.document( ndx ) );
>                         if ( docPath.equals( path ) ) {
>                             count++;
>                             reader.delete( ndx );
>                             bDeleted = true;
>                             break;
>                         }
>                     }
>                 }
>                 if ( !bDeleted ) {
>                     System.out.println( "  Not Deleted: " + path );
>                     for( int ndx = 0; ndx < numDocs; ndx++ ) {
>                         if ( !reader.isDeleted( ndx ) ) {
>                             String docPath = IndexTestDocument.getPath(
> reader.document( ndx ) );
>                             System.out.println( "      path " + ndx + ":
> " +
> docPath );
>                         }
>                     }
>                 }
>             }
>             System.out.println( "Removed " + count + " documents of (" +
>
> files.size() + ")" );
>             reader.close();
>
>             searcher = new IndexSearcher( INDEX_DIR );
>             analyzer = new StandardAnalyzer();
>             query = QueryParser.parse( "Ant", "contents", analyzer );
>
>             hits = searcher.search( query );
>             System.out.println( "Hits after remove: " + hits.length() );
>
>         } catch ( Exception ex ) {
>             ex.printStackTrace();
>         }
>     }
>
>
>     static class IndexTestDocument {
>
>         static public Document createDocument( File f )
>             throws FileNotFoundException {
>             Document doc = new Document();
>             doc.add( Field.Text( "path", normalizePath( f.getPath() ) )
> );
>             Reader reader = new BufferedReader( new InputStreamReader(
> new
> FileInputStream( f ) ) );
>             doc.add( Field.Text( "contents", reader ) );
>             return doc;
>         }
>
>
>         static public String getPath( Document doc ) {
>             return ( String ) doc.get( "path" );
>         }
>
>         static public String normalizePath( String path ) {
>             if ( path == null || path.length() == 0 ) {
>                 return "";
>             }
>             path = path.replace( '\\', '/' );
>             File f = new File( path );
>             if ( f.isDirectory() ) {
>                 if ( path.charAt( path.length() - 1 ) != '/' ) {
>                     path = path + "/";
>                 }
>             }
>             return path;
>         }
>     }
> }


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