@Test
public void testBackwardsCompatibility() throws Exception {
// tests that if the taxonomy index doesn't have the INDEX_EPOCH
// property (supports pre-3.6 indexes), all still works.
Directory dir = newDirectory();
// create an empty index first, so that DirTaxoWriter initializes indexEpoch to 1.
new IndexWriter(dir, new IndexWriterConfig(TEST_VERSION_CURRENT, null)).close();
DirectoryTaxonomyWriter taxoWriter =
new DirectoryTaxonomyWriter(dir, OpenMode.CREATE_OR_APPEND, NO_OP_CACHE);
taxoWriter.close();
DirectoryTaxonomyReader taxoReader = new DirectoryTaxonomyReader(dir);
assertEquals(
1,
Integer.parseInt(taxoReader.getCommitUserData().get(DirectoryTaxonomyWriter.INDEX_EPOCH)));
assertNull(TaxonomyReader.openIfChanged(taxoReader));
taxoReader.close();
dir.close();
}
