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

org.apache.lucene.store.Directory.openInput()
Returns a stream reading an existing file.

      Revision rev = new IndexRevision(writer);
      @SuppressWarnings("unchecked")
      Map<String, List<RevisionFile>> sourceFiles = rev.getSourceFiles();
      String source = sourceFiles.keySet().iterator().next();
      for (RevisionFile file : sourceFiles.values().iterator().next()) {
        IndexInput src = dir.openInput(file.fileName, IOContext.READONCE);
        InputStream in = rev.open(source, file.fileName);
        assertEquals(src.length(), in.available());
        byte[] srcBytes = new byte[(int) src.length()];
        byte[] inBytes = new byte[(int) src.length()];
        int offset = 0;

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        // ensure that finish() added the (valueCount-actualValueCount) missing values
        final long bytes = w.getFormat().byteCount(PackedInts.VERSION_CURRENT, valueCount, w.bitsPerValue);
        assertEquals(bytes, fp - startFp);


        {// test header
          IndexInput in = d.openInput("out.bin", newIOContext(random()));
          // header = codec header | bitsPerValue | valueCount | format
          CodecUtil.checkHeader(in, PackedInts.CODEC_NAME, PackedInts.VERSION_START, PackedInts.VERSION_CURRENT); // codec header
          assertEquals(w.bitsPerValue, in.readVInt());
          assertEquals(valueCount, in.readVInt());
          assertEquals(w.getFormat().getId(), in.readVInt());

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          assertEquals(startFp, in.getFilePointer());
          in.close();
        }


        {// test reader
          IndexInput in = d.openInput("out.bin", newIOContext(random()));
          PackedInts.Reader r = PackedInts.getReader(in);
          assertEquals(fp, in.getFilePointer());
          for(int i=0;i<valueCount;i++) {
            assertEquals("index=" + i + " valueCount="
                    + valueCount + " nbits=" + nbits + " for "

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          assertEquals(r.getClass() + "expected " + expectedBytesUsed + ", got: " + computedBytesUsed,
              expectedBytesUsed, computedBytesUsed);
        }


        { // test reader iterator next
          IndexInput in = d.openInput("out.bin", newIOContext(random()));
          PackedInts.ReaderIterator r = PackedInts.getReaderIterator(in, bufferSize);
          for(int i=0;i<valueCount;i++) {
            assertEquals("index=" + i + " valueCount="
                    + valueCount + " nbits=" + nbits + " for "
                    + r.getClass().getSimpleName(), values[i], r.next());

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          assertEquals(fp, in.getFilePointer());
          in.close();
        }


        { // test reader iterator bulk next
          IndexInput in = d.openInput("out.bin", newIOContext(random()));
          PackedInts.ReaderIterator r = PackedInts.getReaderIterator(in, bufferSize);
          int i = 0;
          while (i < valueCount) {
            final int count = _TestUtil.nextInt(random(), 1, 95);
            final LongsRef next = r.next(count);

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          assertEquals(fp, in.getFilePointer());
          in.close();
        }
        
        { // test direct reader get
          IndexInput in = d.openInput("out.bin", newIOContext(random()));
          PackedInts.Reader intsEnum = PackedInts.getDirectReader(in);
          for (int i = 0; i < valueCount; i++) {
            final String msg = "index=" + i + " valueCount="
                + valueCount + " nbits=" + nbits + " for "
                + intsEnum.getClass().getSimpleName();

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    final IndexOutput out = dir.createOutput("tests.bin", newIOContext(random()));
    for (int i = 0; i < valueCount; ++i) {
      out.writeLong(0);
    }
    out.close();
    final IndexInput in = dir.openInput("tests.bin", newIOContext(random()));
    for (int version = PackedInts.VERSION_START; version <= PackedInts.VERSION_CURRENT; ++version) {
      for (int bpv = 1; bpv <= 64; ++bpv) {
        for (PackedInts.Format format : PackedInts.Format.values()) {
          if (!format.isSupported(bpv)) {
            continue;

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      w.add(value);
      w.finish();
      final long end = out.getFilePointer();
      out.close();


      IndexInput in = dir.openInput("out", newIOContext(random()));
      Reader reader = PackedInts.getReader(in);
      String msg = "Impl=" + w.getClass().getSimpleName() + ", bitsPerValue=" + bitsPerValue;
      assertEquals(msg, 1, reader.size());
      assertEquals(msg, value, reader.get(0));
      assertEquals(msg, end, in.getFilePointer());

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      }
    }
    pout.flush();
    assertEquals((long) Math.ceil((double) totalBits / 8), out.getFilePointer());
    out.close();
    final IndexInput in = dir.openInput("out.bin", IOContext.READONCE);
    final PackedDataInput pin = new PackedDataInput(in);
    for (int i = 0; i < longs.length; ++i) {
      assertEquals("" + i, longs[i], pin.readLong(bitsPerValues[i]));
      if (skip[i]) {
        pin.skipToNextByte();

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      writer.finish();
      assertEquals(valueCount, writer.ord());
      final long fp = out.getFilePointer();
      out.close();


      IndexInput in1 = dir.openInput("out.bin", IOContext.DEFAULT);
      byte[] buf = new byte[(int) fp];
      in1.readBytes(buf, 0, (int) fp);
      in1.seek(0L);
      ByteArrayDataInput in2 = new ByteArrayDataInput(buf);
      final DataInput in = random().nextBoolean() ? in1 : in2;

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