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

               
            case '\r':
               int c2 = in.read();
               if ((c2 != '\n') && (c2 != -1)) {
                  if (!(in instanceof PushbackInputStream)) {
                     in = new PushbackInputStream(in);
                  }
                  ((PushbackInputStream)in).unread(c2);
               } else {
                  done = true;
                  break;

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                    sDataObjectCount = 0;
                    return null;
                }
            }


            PushbackInputStream pis = new PushbackInputStream(in);
            int tag = pis.read();


            if (tag == -1)
            {
                return null;
            }


            pis.unread(tag);


            if (tag != 0x30)  // assume ascii PEM encoded.
            {
                return readPEMCertificate(pis);
            }

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                    sCrlDataObjectCount = 0;
                    return null;
                }
            }


            PushbackInputStream pis = new PushbackInputStream(inStream);
            int tag = pis.read();


            if (tag == -1)
            {
                return null;
            }


            pis.unread(tag);


            if (tag != 0x30)  // assume ascii PEM encoded.
            {
                return readPEMCRL(pis);
            }

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    private int theA;
    private int theB;
    
    public JSMin(InputStream in, OutputStream out) {
        this.in = new PushbackInputStream(in);
        this.out = out;
    }

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        private PushbackInputStream delegate;
        
        public ValueExpressionFilterInputStream(InputStream in)
        {
            super();
            delegate = new PushbackInputStream(in,255);
        }

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            socket.setTcpNoDelay(soNodelay);
            socket.setSoTimeout(soTimeout);
            if (sendBufferSize != -1) {
                socket.setSendBufferSize(sendBufferSize);
            }
            inputStream = new PushbackInputStream(socket.getInputStream());
            outputStream = new BufferedOutputStream(
                new WrappedOutputStream(socket.getOutputStream()),
                socket.getSendBufferSize()
            );
            isOpen = true;

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        socket = socketFactory.createSocket(socket, hostName, portNumber, true);
        if (sendBufferSize != -1) {
            socket.setSendBufferSize(sendBufferSize);
        }        
        inputStream = new PushbackInputStream(socket.getInputStream());
        outputStream = new BufferedOutputStream(
            new WrappedOutputStream(socket.getOutputStream()),
            socket.getSendBufferSize()
        );
        usingSecureSocket = true;

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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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    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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    * @param defaultEnc default encoding if stream does not have 
    *                   BOM marker. Give NULL to use system-level default.
    */
   public UnicodeReader(InputStream in, String defaultEnc) {
    super(in);
      internalIn = new PushbackInputStream(in, BOM_SIZE);
      this.defaultEnc = defaultEnc;
   }

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