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Date: Wed, 06 Sep 2006 10:24:55 +0300
From: Volodymyr Bychkoviak <vbychkoviak@i-hypergrid.com>
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To: java-user@lucene.apache.org
Subject: Re: obtaining the number of documents stored in a .cfs file
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I've used following code to recover index. Note: it only works with .cfs 
files.


    String path = // path to index
    File file = new File(path);
    Directory directory = FSDirectory.getDirectory(file, false);

    String[] files = file.list(new FilenameFilter() {

      public boolean accept(File dir, String name) {
        return name.endsWith(".cfs");
      }

    });
   
    SegmentInfos infos = new SegmentInfos();
    int counter = 0;
    for (int i = 0; i < files.length; i++) {
      String fileName = files[i];
      String segmentName = fileName.substring(1, fileName.lastIndexOf('.'));
     
      int segmentInt = Integer.parseInt(segmentName,Character.MAX_RADIX);
      counter = Math.max(counter, segmentInt);
     
      segmentName = fileName.substring(0, fileName.lastIndexOf('.'));
     
      Directory fileReader = new CompoundFileReader(directory,fileName);
      IndexInput indexStream = fileReader.openInput(segmentName + ".fdx");
      int size = (int)(indexStream.length() / 8);
      indexStream.close();
      fileReader.close();
     
      SegmentInfo segmentInfo = new SegmentInfo(segmentName,size,directory);
      infos.addElement(segmentInfo);
    }

    infos.counter = counter++;
   
    infos.write(directory);

Stanislav Jordanov wrote:
> Suppose I have a bunch of valid .cfs files while the 
> segmens/segments.new file is missing or invalid.
> The task is to 'recover' the present .cfs files into a valid index.
> I think it will be necessary and sufficient to create a segments file 
> that references the .cfs files.
> The only problem I've encountered in generating a vaild and 
> well-formed segments file is that I need to know the number of docs in 
> each cfs file.
> So the couple of questions is:
> Do I have to put the right number of docs for each segments or any 
> (dummy) number will do?
> If I have to put the right number there, how do I get it having the 
> cfs file?
>
> Stanislav
>
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-- 
regards,
Volodymyr Bychkoviak


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