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

org.apache.lucene.store.Directory.listAll()
Returns an array of strings, one for each file in the directory. @throws IOException

    }


    IndexReader r = w.getReader();
    w.close();


    for(String fileName : d.listAll()) {
      try {
        d.deleteFile(fileName);
      } catch (IOException ioe) {
        // ignore: this means codec (correctly) is holding
        // the file open

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        // don't use NRT
        w.commit();
        r = DirectoryReader.open(dir);
      }


      List<String> files = new ArrayList<String>(Arrays.asList(dir.listAll()));


      // RAMDir won't have a write.lock, but fs dirs will:
      files.remove("write.lock");


      assertTrue(files.contains("_0.cfs"));

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        w.commit();
      }
      IndexReader r2 = DirectoryReader.openIfChanged(r);
      assertNotNull(r2);
      assertTrue(r != r2);
      files = Arrays.asList(dir.listAll());


      // NOTE: here we rely on "Windows" behavior, ie, even
      // though IW wanted to delete _0.cfs since it was
      // merged away, because we have a reader open
      // against this file, it should still be here:

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      assertTrue(files.contains("_0.cfs"));
      // forceMerge created this
      //assertTrue(files.contains("_2.cfs"));
      w.deleteUnusedFiles();


      files = Arrays.asList(dir.listAll());
      // r still holds this file open
      assertTrue(files.contains("_0.cfs"));
      //assertTrue(files.contains("_2.cfs"));


      r.close();

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      //assertTrue(files.contains("_2.cfs"));


      r.close();
      if (iter == 0) {
        // on closing NRT reader, it calls writer.deleteUnusedFiles
        files = Arrays.asList(dir.listAll());
        assertFalse(files.contains("_0.cfs"));
      } else {
        // now writer can remove it
        w.deleteUnusedFiles();
        files = Arrays.asList(dir.listAll());

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        files = Arrays.asList(dir.listAll());
        assertFalse(files.contains("_0.cfs"));
      } else {
        // now writer can remove it
        w.deleteUnusedFiles();
        files = Arrays.asList(dir.listAll());
        assertFalse(files.contains("_0.cfs"));
      }
      //assertTrue(files.contains("_2.cfs"));


      w.close();

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    // files are left in the Directory.
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random()))
                                         .setMaxBufferedDocs(2).setMergePolicy(newLogMergePolicy()).setUseCompoundFile(false));
    String[] files = dir.listAll();


    // Creating over empty dir should not create any files,
    // or, at most the write.lock file
    final int extraFileCount;
    if (files.length == 1) {

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    // create as many files as possible
    doc.add(newField("c", "val", customType));
    writer.addDocument(doc);
    // Adding just one document does not call flush yet.
    int computedExtraFileCount = 0;
    for (String file : dir.listAll()) {
      if (file.lastIndexOf('.') < 0
          // don't count stored fields and term vectors in
          || !Arrays.asList("fdx", "fdt", "tvx", "tvd", "tvf").contains(file.substring(file.lastIndexOf('.') + 1))) {
        ++computedExtraFileCount;
      }

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    doc = new Document();
    doc.add(newField("c", "val", customType));
    writer.addDocument(doc);


    // The second document should cause a flush.
    assertTrue("flush should have occurred and files should have been created", dir.listAll().length > 5 + extraFileCount);


    // After rollback, IW should remove all files
    writer.rollback();
    assertEquals("no files should exist in the directory after rollback", 0, dir.listAll().length);

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    // The second document should cause a flush.
    assertTrue("flush should have occurred and files should have been created", dir.listAll().length > 5 + extraFileCount);


    // After rollback, IW should remove all files
    writer.rollback();
    assertEquals("no files should exist in the directory after rollback", 0, dir.listAll().length);


    // Since we rolled-back above, that close should be a no-op
    writer.close();
    assertEquals("expected a no-op close after IW.rollback()", 0, dir.listAll().length);
    dir.close();

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