Examples of org.apache.lucene.store.Directory.copy()

org.apache.lucene.store.Directory.copy()
Copy contents of a directory src to a directory dest. If a file in src already exists in dest then the one in dest will be blindly overwritten.
NOTE: the source directory cannot change while this method is running. Otherwise the results are undefined and you could easily hit a FileNotFoundException.
NOTE: this method only copies files that look like index files (ie, have extensions matching the known extensions of index files). @param src source directory @param dest destination directory @param closeDirSrc if true, call {@link #close()} method on source directory @throws IOException

      
      // fsync all copied files (except segmentsFile)
      indexDir.sync(files);
      
      // now copy and fsync segmentsFile
      clientDir.copy(indexDir, segmentsFile, segmentsFile, IOContext.READONCE);
      indexDir.sync(Collections.singletonList(segmentsFile));
      
      success = true;
    } finally {
      if (!success) {

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    CompoundFileDirectory csw = new CompoundFileDirectory(newDir, "d.cfs", newIOContext(random()), true);
    createSequenceFile(newDir, "d1", (byte) 0, 15);
    IndexOutput out = csw.createOutput("d.xyz", newIOContext(random()));
    out.writeInt(0);
    try {
      newDir.copy(csw, "d1", "d1", newIOContext(random()));
      fail("file does already exist");
    } catch (IllegalArgumentException e) {
      //
    }
    out.close();

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    out.writeInt(0);
    out1.writeInt(1);
    out.close();
    out1.close();
    nested.close();
    newDir.copy(csw, "b.cfs", "b.cfs", newIOContext(random()));
    newDir.copy(csw, "b.cfe", "b.cfe", newIOContext(random()));
    newDir.deleteFile("b.cfs");
    newDir.deleteFile("b.cfe");
    csw.close();

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    out1.writeInt(1);
    out.close();
    out1.close();
    nested.close();
    newDir.copy(csw, "b.cfs", "b.cfs", newIOContext(random()));
    newDir.copy(csw, "b.cfe", "b.cfe", newIOContext(random()));
    newDir.deleteFile("b.cfs");
    newDir.deleteFile("b.cfe");
    csw.close();
    
    assertEquals(2, newDir.listAll().length);

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    }
    
    final CompoundFileDirectory cfd = new CompoundFileDirectory(d, "c.cfs", newIOContext(random()), true);
    for(int fileIdx=0;fileIdx<FILE_COUNT;fileIdx++) {
      final String fileName = "file." + fileIdx;
      d.copy(cfd, fileName, fileName, newIOContext(random()));
    }
    cfd.close();


    final IndexInput[] ins = new IndexInput[FILE_COUNT];
    final CompoundFileDirectory cfr = new CompoundFileDirectory(d, "c.cfs", newIOContext(random()), false);

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    out.writeInt(0);
    out1.writeInt(1);
    out.close();
    out1.close();
    nested.close();
    newDir.copy(csw, "b.cfs", "b.cfs", newIOContext(random()));
    newDir.copy(csw, "b.cfe", "b.cfe", newIOContext(random()));
    newDir.deleteFile("b.cfs");
    newDir.deleteFile("b.cfe");
    csw.close();

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    out1.writeInt(1);
    out.close();
    out1.close();
    nested.close();
    newDir.copy(csw, "b.cfs", "b.cfs", newIOContext(random()));
    newDir.copy(csw, "b.cfe", "b.cfe", newIOContext(random()));
    newDir.deleteFile("b.cfs");
    newDir.deleteFile("b.cfe");
    csw.close();
    
    assertEquals(2, newDir.listAll().length);

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    }
    
    final CompoundFileDirectory cfd = new CompoundFileDirectory(d, "c.cfs", newIOContext(random()), true);
    for(int fileIdx=0;fileIdx<FILE_COUNT;fileIdx++) {
      final String fileName = "file." + fileIdx;
      d.copy(cfd, fileName, fileName, newIOContext(random()));
    }
    cfd.close();


    final IndexInput[] ins = new IndexInput[FILE_COUNT];
    final CompoundFileDirectory cfr = new CompoundFileDirectory(d, "c.cfs", newIOContext(random()), false);

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      // fsync all copied files (except segmentsFile)
      indexDir.sync(files);
      
      // now copy and fsync segmentsFile
      clientDir.copy(indexDir, segmentsFile, segmentsFile, IOContext.READONCE);
      indexDir.sync(Collections.singletonList(segmentsFile));
      
      success = true;
    } finally {
      if (!success) {

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      // now copy and fsync segmentsFile, taxonomy first because it is ok if a
      // reader sees a more advanced taxonomy than the index.
      if (taxoSegmentsFile != null) {
        taxoClientDir.copy(taxoDir, taxoSegmentsFile, taxoSegmentsFile, IOContext.READONCE);
      }
      indexClientDir.copy(indexDir, indexSegmentsFile, indexSegmentsFile, IOContext.READONCE);
      
      if (taxoSegmentsFile != null) {
        taxoDir.sync(Collections.singletonList(taxoSegmentsFile));
      }
      indexDir.sync(Collections.singletonList(indexSegmentsFile));

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