Examples of java.io.PushbackInputStream

java.io.PushbackInputStream
A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" one byte. This is useful in situations where it is convenient for a fragment of code to read an indefinite number of data bytes that are delimited by a particular byte value; after reading the terminating byte, the code fragment can "unread" it, so that the next read operation on the input stream will reread the byte that was pushed back. For example, bytes representing the characters constituting an identifier might be terminated by a byte representing an operator character; a method whose job is to read just an identifier can read until it sees the operator and then push the operator back to be re-read. @author David Connelly @author Jonathan Payne @version 1.43, 06/19/06 @since JDK1.0

    }


    private String findBoundaryFromInputStream() throws IOException {
        InputStream is = message.getContent(InputStream.class);
        //boundary should definitely be in the first 2K;
        PushbackInputStream in = new PushbackInputStream(is, 4096);
        byte buf[] = new byte[2048];
        int i = in.read(buf);
        String msg = IOUtils.newStringFromBytes(buf, 0, i);
        in.unread(buf, 0, i);
        
        // Reset the input stream since we'll need it again later
        message.setContent(InputStream.class, in);


        // Use regex to get the boundary and return null if it's not found

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//                System.out.write(b, off, r);
//                System.out.flush();
//                return r;
//            }
//        };
        extract(new PushbackInputStream(in, 2));
    }

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    private static InputStream getNonEmptyContent(
        HttpURLConnection connection
    ) {
        InputStream in = null;
        try {
            PushbackInputStream pin = 
                new PushbackInputStream(connection.getInputStream());
            int c = pin.read();
            if (c != -1) {
                pin.unread((byte)c);
                in = pin;
            }
        } catch (IOException ioe) {
            // ignore
        }

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   * @tests java.io.PushbackInputStream#PushbackInputStream(java.io.InputStream)
   */
  public void test_ConstructorLjava_io_InputStream() {
    // Test for method java.io.PushbackInputStream(java.io.InputStream)
    try {
      pis = new PushbackInputStream(new ByteArrayInputStream("Hello"
          .getBytes()));
      pis.unread("He".getBytes());
    } catch (IOException e) {
      // Correct
      // Pushback buffer should be full

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   *        int)
   */
  public void test_ConstructorLjava_io_InputStreamI() {
    // Test for method java.io.PushbackInputStream(java.io.InputStream, int)
    try {
      pis = new PushbackInputStream(new ByteArrayInputStream("Hello"
          .getBytes()), 5);
      pis.unread("Hellos".getBytes());
    } catch (IOException e) {
      // Correct
      // Pushback buffer should be full

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   * Sets up the fixture, for example, open a network connection. This method
   * is called before a test is executed.
   */
  protected void setUp() {


    pis = new PushbackInputStream(new ByteArrayInputStream(fileString
        .getBytes()), 65535);
  }

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            throw new IOException("Content length exceeds maximum upload size");
        }


        parseMultiPart(
                new TokenStream(
                        new PushbackInputStream(
                                new BufferedInputStream(request.getInputStream()),
                                MAX_BOUNDARY_SIZE)), getBoundary(request.getContentType()));
    }

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    private static InputStream getNonEmptyContent(
        HttpURLConnection connection
    ) {
        InputStream in = null;
        try {
            PushbackInputStream pin = 
                new PushbackInputStream(connection.getInputStream());
            int c = pin.read();
            if (c != -1) {
                pin.unread((byte)c);
                in = pin;
            }
        } catch (IOException ioe) {
            // ignore
        }

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            response.setContentLength(-1);
            response.setStatus(HttpServletResponse.SC_OK);
            response.getOutputStream().flush();
            handler.setOutputStream(response.getOutputStream());


            PushbackInputStream in =
                    new PushbackInputStream(request.getInputStream());
            for (;;) {
                try {
                    ChannelBuffer buffer = read(in);
                    if (buffer == null) {
                        break;

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            channel.socket.connect(
                    remoteAddress, channel.getConfig().getConnectTimeoutMillis());
            connected = true;


            // Obtain I/O stream.
            channel.in = new PushbackInputStream(channel.socket.getInputStream(), 1);
            channel.out = channel.socket.getOutputStream();


            // Fire events.
            future.setSuccess();
            if (!bound) {

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