Example usage for java.nio ByteBuffer allocate

List of usage examples for java.nio ByteBuffer allocate

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Introduction

In this page you can find the example usage for java.nio ByteBuffer allocate.

Prototype

public static ByteBuffer allocate(int capacity)

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:com.sastix.cms.server.services.cache.CacheFileUtilsServiceImpl.java

@Override
public byte[] downloadResource(URL url) throws IOException {
    //create buffer with capacity in bytes
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {/*from ww  w .ja  v  a 2  s. c om*/
        ByteBuffer bufIn = ByteBuffer.allocate(1024);
        ReadableByteChannel rbc = Channels.newChannel(url.openStream());
        int bytesRead;
        while ((bytesRead = rbc.read(bufIn)) > 0) {
            baos.write(bufIn.array(), 0, bytesRead);
            bufIn.rewind();
        }
        bufIn.clear();
        return baos.toByteArray();
    } finally {
        baos.close();
    }
}

From source file:Main.java

public static byte[] genSirfCommand(String commandHexa) {
    int length = commandHexa.length() / 2;
    ByteBuffer command = ByteBuffer.allocate(length);
    command.put(new BigInteger(commandHexa, 16).toByteArray(), 1, length);
    return command.array();
}

From source file:ConversionUtil.java

public static byte[] convertToByteArray(char value) {
    byte[] bytes = new byte[2];
    ByteBuffer buffer = ByteBuffer.allocate(bytes.length);
    buffer.putChar(value);//from  ww w .  jav  a 2 s .co m
    return buffer.array();
    // buffer.get(bytes);
    /*
    for (int i =0;i<bytes.length; ++i) {
    int offset = (bytes.length -i-1) *8;
    bytes[i] = (byte)((value & (0xff << offset)) >>> offset);
    }
     **/
    // return bytes;
}

From source file:SelfClassLoader.java

private byte[] loadClassBytes(String className) throws ClassNotFoundException {
    try {//from ww  w .ja  v  a2  s . c  o  m
        String classFile = getClassFile(className);
        FileInputStream fis = new FileInputStream(classFile);
        FileChannel fileC = fis.getChannel();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        WritableByteChannel outC = Channels.newChannel(baos);
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        while (true) {
            int i = fileC.read(buffer);
            if (i == 0 || i == -1) {
                break;
            }
            buffer.flip();
            outC.write(buffer);
            buffer.clear();
        }
        fis.close();
        return baos.toByteArray();
    } catch (IOException fnfe) {
        throw new ClassNotFoundException(className);
    }
}

From source file:com.example.IdGenerator.java

public long generateLong() {
    final LocalDateTime now = LocalDateTime.now(clock);
    final Duration duration = Duration.between(BASE, now);
    final int high = (int) duration.getSeconds();
    final int low = duration.getNano();
    final byte[] hbs = ByteBuffer.allocate(4).putInt(high).array();
    final byte[] lbs = ByteBuffer.allocate(4).putInt(low).array();
    final byte[] bytes = new byte[8];
    System.arraycopy(hbs, 0, bytes, 0, 4);
    System.arraycopy(lbs, 0, bytes, 4, 4);
    final ByteBuffer buffer = ByteBuffer.allocate(8).put(bytes, 0, 8);
    buffer.flip();// ww w.  j  av  a  2s .  c om
    return buffer.getLong();
}

From source file:com.mozilla.bagheera.util.IdUtil.java

/**
 * Takes a given id and prefixes it with a byte character and the date in a non-random fashion
 * This method expects id to be something like a UUID consisting only of hex characters.  If id 
 * is something else this will produce unpredictable results.
 * @param id/* www . j  a va  2  s  . c  o m*/
 * @param d
 * @return
 * @throws IOException
 */
public static byte[] nonRandByteBucketizeId(String id, Date d) throws IOException {
    if (StringUtils.isBlank(id)) {
        throw new IllegalArgumentException("id cannot be null or empty");
    }
    if (d == null) {
        throw new IllegalArgumentException("date cannot be null");
    }

    // bucket byte + SDF bytes + id bytes
    ByteBuffer buf = ByteBuffer.allocate(9 + id.length());
    int bucket = 0;
    if (id.length() >= 2) {
        // Munge two hex characters into the range of a single byte
        bucket = Integer.parseInt(id.substring(0, 2), 16) - 128;
    } else {
        bucket = Integer.parseInt(id, 16) - 128;
    }
    buf.put((byte) bucket);
    buf.put(SDF.format(d).getBytes());
    buf.put(id.getBytes());

    return buf.array();
}

From source file:eu.pursuit.core.ItemName.java

public byte[] toByteArray() {
    int length = 0;
    if (scopeId != null) {
        length += scopeId.getLength();//  ww w  . j a  v a 2 s  .  com
    }

    if (rendezvousId != null) {
        length += rendezvousId.getId().length;
    }

    ByteBuffer buffer = ByteBuffer.allocate(length);
    if (scopeId != null) {
        scopeId.fill(buffer);
    }

    if (rendezvousId != null) {
        buffer.put(rendezvousId.getId());
    }
    return buffer.array();
}

From source file:net.beaconpe.jraklib.protocol.AcknowledgePacket.java

@Override
protected void _encode() {
    ByteBuffer payload = ByteBuffer.allocate(1024);
    int count = packets.length;
    int records = 0;

    if (count > 0) {
        int pointer = 0;
        int start = packets[0];
        int last = packets[0];

        while (pointer + 1 < count) {
            int current = packets[pointer++];
            int diff = current - last;
            if (diff == 1) {
                last = current;// w w w.ja v  a 2  s.  c  om
            } else if (diff > 1) { //Forget about duplicated packets (bad queues?)
                if (start == last) {
                    payload.put((byte) 0x01);
                    payload.put(Binary.writeLTriad(start));
                    start = last = current;
                } else {
                    payload.put((byte) 0x00);
                    payload.put(Binary.writeLTriad(start));
                    payload.put(Binary.writeLTriad(last));
                    start = last = current;
                }
                records = records + 1;
            }
        }

        if (start == last) {
            payload.put((byte) 0x01);
            payload.put(Binary.writeLTriad(start));
        } else {
            payload.put((byte) 0x00);
            payload.put(Binary.writeLTriad(start));
            payload.put(Binary.writeLTriad(last));
        }
        records = records + 1;
    }
    putShort((short) records);
    put(ArrayUtils.subarray(payload.array(), 0, payload.position()));
}

From source file:RegexProperties.java

public void load(FileInputStream inStream) throws IOException, PatternSyntaxException {
    FileChannel fc = inStream.getChannel();

    ByteBuffer bb = ByteBuffer.allocate((int) fc.size());
    fc.read(bb);/* ww  w.j a  v a2  s.  c om*/
    bb.flip();
    String fileContent = new String(bb.array());

    Pattern pattern = Pattern.compile("^(.*)$", Pattern.MULTILINE);
    Matcher matcher = pattern.matcher(fileContent);

    while (matcher.find()) {
        String line = matcher.group(1);
        if (line != null && !"".equals(line.trim()) && !line.startsWith("#") && !line.startsWith("!")) {
            String keyValue[] = null;
            if (line.indexOf("=") > 0)
                keyValue = line.split("=", 2);
            else
                keyValue = line.split(":", 2);

            if (keyValue != null) {
                super.put(keyValue[0].trim(), keyValue[1]);
            }
        }
    }
    fc = null;
    bb = null;
}

From source file:io.opencensus.contrib.spring.sleuth.v1x.OpenCensusSleuthSpan.java

@SuppressWarnings("deprecation")
private static SpanContext fromSleuthSpan(org.springframework.cloud.sleuth.Span span) {
    return SpanContext.create(
            TraceId.fromBytes(ByteBuffer.allocate(TraceId.SIZE).putLong(span.getTraceIdHigh())
                    .putLong(span.getTraceId()).array()),
            SpanId.fromBytes(ByteBuffer.allocate(SpanId.SIZE).putLong(span.getSpanId()).array()),
            Boolean.TRUE.equals(span.isExportable()) ? sampledOptions : notSampledOptions);
}