Example usage for java.io PushbackInputStream unread

Introduction

In this page you can find the example usage for java.io PushbackInputStream unread.

Prototype

public void unread(byte[] b) throws IOException 

Source Link

Document

Pushes back an array of bytes by copying it to the front of the pushback buffer.

Usage

From source file:Main.java

public static void main(String[] args) {
    byte[] arrByte = new byte[1024];
    byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' };

    InputStream is = new ByteArrayInputStream(byteArray);
    PushbackInputStream pis = new PushbackInputStream(is, 10);

    try {/*from www  .  j a v  a 2 s.  c o m*/
        for (int i = 0; i < byteArray.length; i++) {
            arrByte[i] = (byte) pis.read();
            System.out.println((char) arrByte[i]);
        }
        byte[] b = { 'W', 'o', 'r', 'l', 'd' };
        pis.unread(b);
        for (int i = 0; i < byteArray.length; i++) {
            arrByte[i] = (byte) pis.read();
            System.out.println((char) arrByte[i]);
        }
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

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From source file:PushbackInputStreamDemo.java

public static void main(String args[]) throws IOException {
    String s = "if (a == 4) a = 0;\n";
    byte buf[] = s.getBytes();
    ByteArrayInputStream in = new ByteArrayInputStream(buf);
    PushbackInputStream f = new PushbackInputStream(in);
    int c;/*ww w  .j a v a  2 s.  com*/

    while ((c = f.read()) != -1) {
        switch (c) {
        case '=':
            if ((c = f.read()) == '=')
                System.out.print(".eq.");
            else {
                System.out.print("<-");
                f.unread(c);
            }
            break;
        default:
            System.out.print((char) c);
            break;
        }
    }
}

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From source file:Main.java

public static void main(String args[]) throws IOException {
    byte buf[] = "==  = ".getBytes();
    PushbackInputStream f = new PushbackInputStream(new ByteArrayInputStream(buf));
    int c;//from   ww  w . jav a2 s .c  o m
    while ((c = f.read()) != -1) {
        switch (c) {
        case '=':
            c = f.read();
            if (c == '=')
                System.out.print(".eq.");
            else {
                System.out.print("=");
                f.unread(c);
            }
            break;
        default:
            System.out.print((char) c);
            break;
        }
    }
}

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From source file:Main.java

public static void main(String args[]) throws IOException {
    byte buf[] = "==  = ".getBytes();
    PushbackInputStream f = new PushbackInputStream(new ByteArrayInputStream(buf), 100);
    int c;/*  www  .ja v a 2 s  .c o  m*/
    while ((c = f.read()) != -1) {
        switch (c) {
        case '=':
            c = f.read();
            if (c == '=')
                System.out.print(".eq.");
            else {
                System.out.print("=");
                f.unread(c);
            }
            break;
        default:
            System.out.print((char) c);
            break;
        }
    }
}

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From source file:Main.java

public static void main(String[] args) {
    byte[] arrByte = new byte[1024];
    byte[] byteArray = new byte[] { 'j', 'a', 'v', 'a', '2', 's', '.', 'c', 'o', 'm' };

    InputStream is = new ByteArrayInputStream(byteArray);
    PushbackInputStream pis = new PushbackInputStream(is, 10);

    try {/*from   w w  w .  j  a  v  a  2s.c  om*/
        // read from the buffer one character at a time
        for (int i = 0; i < byteArray.length; i++) {
            // read a char into our array
            arrByte[i] = (byte) pis.read();
            System.out.println((char) arrByte[i]);
        }
        // unread a char
        pis.unread('F');

        // read again from the buffer 
        arrByte[1] = (byte) pis.read();
        System.out.println((char) arrByte[1]);
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

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From source file:Main.java

public static final int peek(PushbackInputStream in) {
    try {/*from  www.j a  v  a 2  s.c o  m*/
        int p = in.read();
        in.unread(p);
        return p;
    } catch (IOException e) {
        return -1;
    }
}

---

From source file:Main.java

/**
 * Checks the InputStream if it contains  GZIP compressed data
 *
 * @param inputStream InputStream to be checked
 * @return true or false if the stream contains GZIP compressed data
 * @throws java.io.IOException//from w w  w.j  av  a 2 s .co  m
 */
public static boolean isInputStreamGZIPCompressed(final PushbackInputStream inputStream) throws IOException {
    if (inputStream == null)
        return false;

    byte[] signature = new byte[2];
    int readStatus = inputStream.read(signature);
    inputStream.unread(signature);
    int streamHeader = ((int) signature[0] & 0xff) | ((signature[1] << 8) & 0xff00);
    return readStatus == 2 && GZIPInputStream.GZIP_MAGIC == streamHeader;
}

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From source file:eu.europeana.uim.sugarcrmclient.internal.ExtendedSaajSoapMessageFactory.java

/**
 * Detects if the incoming stream is Gzip encoded
 * /*from ww w .  ja  v  a 2  s.  c o  m*/
 * @param pb
 * @return an InputStream/GZIPInputStream 
 * @throws IOException
 */
public static InputStream decompressStream(PushbackInputStream pb) throws IOException {
    byte[] signature = new byte[2];
    pb.read(signature);
    pb.unread(signature);

    if (signature[0] == 31 && signature[1] == -117)
        return new GZIPInputStream(pb);
    else
        return pb;
}

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From source file:com.ning.metrics.serialization.smile.SmileEnvelopeEventDeserializer.java

/**
 * Extracts all events in the stream//w  ww .j ava 2s. co m
 * Note: Stream must be formatted as an array of (serialized) SmileEnvelopeEvents.
 *
 * @param in InputStream containing events
 * @return A list of SmileEnvelopeEvents
 * @throws IOException generic I/O exception
 */
public static List<SmileEnvelopeEvent> extractEvents(final InputStream in) throws IOException {
    final PushbackInputStream pbIn = new PushbackInputStream(in);

    final byte firstByte = (byte) pbIn.read();

    // EOF?
    if (firstByte == -1) {
        return null;
    }

    pbIn.unread(firstByte);

    SmileEnvelopeEventDeserializer deser = (firstByte == SMILE_MARKER)
            ? new SmileEnvelopeEventDeserializer(pbIn, false)
            : new SmileEnvelopeEventDeserializer(pbIn, true);
    final List<SmileEnvelopeEvent> events = new LinkedList<SmileEnvelopeEvent>();

    while (deser.hasNextEvent()) {
        SmileEnvelopeEvent event = deser.getNextEvent();
        if (event == null) {
            // TODO: this is NOT expected, should warn
            break;
        }
        events.add(event);
    }
    return events;
}

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From source file:Main.java

public static BufferedReader readMap(InputStream in) throws IOException {

    PushbackInputStream pushback = new PushbackInputStream(in, 3);

    int first = pushback.read();
    if (first == 0xEF) {
        int second = pushback.read();
        if (second == 0xBB) {
            int third = pushback.read();
            if (third == 0xBF) {
                return new BufferedReader(new InputStreamReader(pushback, "UTF-8"));
            }/*from   w ww  .j  a v a  2s .  com*/
            pushback.unread(third);
        }
        pushback.unread(second);
    }
    pushback.unread(first);

    return new BufferedReader(new InputStreamReader(pushback, "ISO-8859-1"));
}

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