Example usage for java.io PushbackInputStream read

Introduction

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

Prototype

public int read() throws IOException 

Source Link

Document

Reads the next byte of data from this input stream.

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' };

    try {//from www . jav  a2 s . c  o  m
        InputStream is = new ByteArrayInputStream(byteArray);
        PushbackInputStream pis = new PushbackInputStream(is);

        System.out.println(pis.available());

        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: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.  ja  va  2  s  .com
        // 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 w w w .  j  a  va2  s  . c  o m
        int p = in.read();
        in.unread(p);
        return p;
    } catch (IOException e) {
        return -1;
    }
}

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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"));
            }// ww  w .j a  v a  2  s  . c  o m
            pushback.unread(third);
        }
        pushback.unread(second);
    }
    pushback.unread(first);

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

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From source file:Main.java

public static final int ReadInt(PushbackInputStream in, int def) {
    int b;/* w ww .  j  av  a 2s  .c  om*/
    boolean neg = false;
    int i = 0, digits = 0;
    try {
        while (true) {
            b = (int) in.read() & 0xff;
            if (b == '-' && digits == 0)
                neg = !neg;
            else if (Character.isDigit(b)) {
                i = 10 * i + (b - (int) '0');
                ++digits;
            } else if (digits != 0 || !Character.isSpace((char) b)) {
                if (b != -1)
                    in.unread(b);
                break;
            }
        }
    } catch (IOException e) {
    }
    try {
        while ((b = in.read()) != '/' && b != -1)
            ;
    } catch (IOException e) {
    }
    if (neg)
        i = -i;
    return digits > 0 ? i : def;
}

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

/**
 * Extracts all events in the stream/*from   ww w  .  ja  va  2  s .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:com.digitalpebble.behemoth.io.warc.HttpResponse.java

private static int readLine(PushbackInputStream in, StringBuilder line, boolean allowContinuedLine)
        throws IOException {
    line.setLength(0);/*from  w  w w  .  j ava2s.c  o m*/
    for (int c = in.read(); c != -1; c = in.read()) {
        switch (c) {
        case '\r':
            if (peek(in) == '\n') {
                in.read();
            }
        case '\n':
            if (line.length() > 0) {
                // at EOL -- check for continued line if the current
                // (possibly continued) line wasn't blank
                if (allowContinuedLine)
                    switch (peek(in)) {
                    case ' ':
                    case '\t': // line is continued
                        in.read();
                        continue;
                    }
            }
            return line.length(); // else complete
        default:
            line.append((char) c);
        }
    }
    throw new EOFException();
}

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From source file:com.digitalpebble.storm.crawler.protocol.http.HttpResponse.java

private static int peek(PushbackInputStream in) throws IOException {
    int value = in.read();
    in.unread(value);/*from  w  w  w. ja va 2s .com*/
    return value;
}

---

From source file:com.digitalpebble.storm.crawler.protocol.http.HttpResponse.java

private static int readLine(PushbackInputStream in, StringBuffer line, boolean allowContinuedLine)
        throws IOException {
    line.setLength(0);/* w w  w . ja v  a  2s.c  o  m*/
    for (int c = in.read(); c != -1; c = in.read()) {
        switch (c) {
        case '\r':
            if (peek(in) == '\n') {
                in.read();
            }
        case '\n':
            if (line.length() > 0) {
                // at EOL -- check for continued line if the current
                // (possibly continued) line wasn't blank
                if (allowContinuedLine)
                    switch (peek(in)) {
                    case ' ':
                    case '\t': // line is continued
                        in.read();
                        continue;
                    }
            }
            return line.length(); // else complete
        default:
            line.append((char) c);
        }
    }
    throw new EOFException();
}

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From source file:grails.converters.JSON.java

/**
 * Parses the given request's InputStream and returns ether a JSONObject or a JSONArry
 *
 * @param request the JSON Request//from   ww w . j a  v  a 2 s  .com
 * @return ether a JSONObject or a JSONArray - depending on the given JSON
 * @throws ConverterException when the JSON content is not valid
 */
public static Object parse(HttpServletRequest request) throws ConverterException {
    Object json = request.getAttribute(CACHED_JSON);
    if (json != null) {
        return json;
    }

    String encoding = request.getCharacterEncoding();
    if (encoding == null) {
        encoding = Converter.DEFAULT_REQUEST_ENCODING;
    }
    try {
        PushbackInputStream pushbackInputStream = null;
        int firstByte = -1;
        try {
            pushbackInputStream = new PushbackInputStream(request.getInputStream());
            firstByte = pushbackInputStream.read();
        } catch (IOException ioe) {
        }

        if (firstByte == -1) {
            return new JSONObject();
        }

        pushbackInputStream.unread(firstByte);
        json = parse(pushbackInputStream, encoding);
        request.setAttribute(CACHED_JSON, json);
        return json;
    } catch (IOException e) {
        throw new ConverterException("Error parsing JSON", e);
    }
}

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