Examples of java.nio.Buffer

java.nio.Buffer
A buffer is a list of elements of a specific primitive type.
A buffer can be described by following properties:
- Capacity, is the number of elements a buffer can hold. Capacity is no less than zero and never changes.
- Posotion, is a cursor of this buffer. Elements are read or write at the position if you do not specify an index explicitly. Position is no less than zero and no greater than the limit.
- Limit controls the scope of accessible elements. You can only read or write elements from index zero to limit - 1. Accessing elements out of the scope will cause exception. Limit is no less than zero and no greater than capacity.
- Mark, is used to remember the current position, so that you can reset the position later. Mark is no less than zero and no greater than position.
- A buffer can be readonly or read-write. Trying to modify the elements of a readonly buffer will cause ReadOnlyBufferException, while changing the position, limit and mark of a readonly buffer is OK.
- A buffer can be direct or indirect. A direct buffer will try its best to take advantage of native memory APIs and it may not stay in java heap, thus not affected by GC.
Buffers are not thread-safe. If concurrent access to a buffer instance is required, then the callers are responsible to take care of the synchronization issues.

        // Write them out, read what we wrote and check it
        client.write(buffers);
        ByteBuffer readBuffer = ByteBuffer.allocate(1024);
        worker.read(readBuffer);
        readBuffer.flip();
        Buffer expected = ByteBuffer.allocate(1024).put(data).put(data).flip();
        assertEquals(expected, readBuffer);


        // Tidy-up
        worker.close();
        client.close();

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  public static OpenEXRImage read(ImageInputStream source) throws IOException {
    return new OpenEXRImage(source);
  }


  private Buffer getChannelBuffer(String name) {
    Buffer buf = data.get(name);
    return buf != null ? buf : getChannelBufferSync(name);
  }

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    Buffer buf = data.get(name);
    return buf != null ? buf : getChannelBufferSync(name);
  }


  private synchronized Buffer getChannelBufferSync(String name) {
    Buffer buf = data.get(name);
    if (buf == null) {
      ChannelList chlist = getChannelList();
      Channel channel = chlist.getChannel(name);
      Box2i dataWindow = getDataWindow();
      int w = dataWindow.getXSize();

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          int sx = channel.getxSampling();
          int sy = channel.getySampling();
          if (y % sy == 0) {
            int nx = 1 + (x1 - x0 - (x1 % sx)) / sx;
            int offset = ((y - ymin) / sy) * nx;
            Buffer chBuf = getChannelBuffer(name);
            PixelType pt = channel.getPixelType();


            switch (pt) {
            case UINT:
              bytes.asIntBuffer().put((IntBuffer)

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         int chunkSize = 10; // 10K
         int chunkId = 0;


         CharBuffer cbuf = CharBuffer.allocate(1024 * chunkSize);
         while (bufferedReader.read(cbuf) >= 0) {
            Buffer buffer = cbuf.flip();
            String textChunk = buffer.toString();
            cache.put(textFile + (chunkId++), textChunk);
            cbuf.clear();
            if (chunkId % 100 == 0) System.out.printf("  Inserted %s chunks from %s into grid%n", chunkId, textFile);
         }
      } finally {

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        return ((Buffer) o).array();
    }


    @Override
    public int offset(Object o) {
        Buffer buffer = (Buffer) o;
        return buffer.arrayOffset() + buffer.position();
    }

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        return ((Buffer) o).array();
    }


    @Override
    public int offset(Object o) {
        Buffer buffer = (Buffer) o;
        return buffer.arrayOffset() + buffer.position();
    }

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        bs.dbuffer = ((ByteBuffer)bs.buffer).asDoubleBuffer();
        bs.write();
    }
    public void testBufferFieldReadUnchanged() {
        BufferStructure bs = new BufferStructure();
        Buffer b = ByteBuffer.allocateDirect(16);
        bs.buffer = b;
        bs.dbuffer = ((ByteBuffer)bs.buffer).asDoubleBuffer();
        bs.write();
        bs.read();
        assertEquals("Buffer field should be unchanged", b, bs.buffer);

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