Example usage for java.nio ByteBuffer asLongBuffer

Introduction

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

Prototype

public abstract LongBuffer asLongBuffer();

Source Link

Document

Returns a long buffer which is based on the remaining content of this byte buffer.

Usage

From source file:MainClass.java

private static void createFile() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/primes.bin");
    FileOutputStream outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    final int BUFFERSIZE = 100;
    ByteBuffer buf = ByteBuffer.allocate(BUFFERSIZE);
    LongBuffer longBuf = buf.asLongBuffer();
    int primesWritten = 0;
    while (primesWritten < primes.length) {
        longBuf.put(primes, primesWritten, min(longBuf.capacity(), primes.length - primesWritten));
        buf.limit(8 * longBuf.position());

        file.write(buf);/*from w w  w .  j  av  a2 s .  c  om*/
        primesWritten += longBuf.position();
        longBuf.clear();
        buf.clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

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From source file:Main.java

public static LongBuffer newLongBuffer(int numLongs) {
    ByteBuffer buffer = ByteBuffer.allocate(numLongs * 8);
    buffer.order(ByteOrder.nativeOrder());
    return buffer.asLongBuffer();
}

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From source file:Main.java

public static LongBuffer newLongBuffer(int numLongs) {
    ByteBuffer buffer = ByteBuffer.allocateDirect(numLongs * 8);
    buffer.order(ByteOrder.nativeOrder());
    return buffer.asLongBuffer();
}

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From source file:ome.io.bioformats.BfPixelsWrapper.java

/**
 * cgb - stolen from ImportLibrary - slightly modified
 *
 * Examines a byte array to see if it needs to be byte swapped and modifies
 * the byte array directly.//  w  ww .j av  a 2s .c  o  m
 * @param bytes The byte array to check and modify if required.
 * @return the <i>byteArray</i> either swapped or not for convenience.
 * @throws IOException if there is an error read from the file.
 * @throws FormatException if there is an error during metadata parsing.
 */
public byte[] swapIfRequired(byte[] bytes) throws FormatException, IOException {
    // We've got nothing to do if the samples are only 8-bits wide.
    if (pixelSize == 1)
        return bytes;

    boolean isLittleEndian = reader.isLittleEndian();
    ByteBuffer buffer = ByteBuffer.wrap(bytes);
    int length;
    if (isLittleEndian) {
        if (pixelSize == 2) { // short/ushort
            ShortBuffer buf = buffer.asShortBuffer();
            length = buffer.limit() / 2;
            for (int i = 0; i < length; i++) {
                buf.put(i, DataTools.swap(buf.get(i)));
            }
        } else if (pixelSize == 4) { // int/uint/float
            IntBuffer buf = buffer.asIntBuffer();
            length = buffer.limit() / 4;
            for (int i = 0; i < length; i++) {
                buf.put(i, DataTools.swap(buf.get(i)));
            }
        } else if (pixelSize == 8) // long/double
        {
            LongBuffer buf = buffer.asLongBuffer();
            length = buffer.limit() / 8;
            for (int i = 0; i < length; i++) {
                buf.put(i, DataTools.swap(buf.get(i)));
            }
        } else {
            throw new FormatException(String.format("Unsupported sample bit width: %d", pixelSize));
        }
    }
    // We've got a big-endian file with a big-endian byte array.
    bytes = buffer.array();
    return bytes;
}

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From source file:org.bimserver.utils.BinUtils.java

public static byte[] longToByteArray(long inLong) {
    byte[] bArray = new byte[8];
    ByteBuffer bBuffer = ByteBuffer.wrap(bArray);
    LongBuffer lBuffer = bBuffer.asLongBuffer();
    lBuffer.put(inLong);//from w w w . j  a  va 2s.  c o  m
    return bArray;
}

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From source file:org.jclouds.kinetic.strategy.internal.KineticStorageStrategyImpl.java

private Blob createBlobFromByteSource(final String container, final String key, final ByteSource byteSource) {
    BlobBuilder builder = blobBuilders.get();
    builder.name(key);//from ww w. ja va2  s. c o  m
    File file = getFileForBlobKey(container, key);
    try {
        String cacheControl = null;
        String contentDisposition = null;
        String contentEncoding = null;
        String contentLanguage = null;
        String contentType = null;
        HashCode hashCode = null;
        Date expires = null;
        ImmutableMap.Builder<String, String> userMetadata = ImmutableMap.builder();

        UserDefinedFileAttributeView view = getUserDefinedFileAttributeView(file.toPath());
        if (view != null) {
            Set<String> attributes = ImmutableSet.copyOf(view.list());

            cacheControl = readStringAttributeIfPresent(view, attributes, XATTR_CACHE_CONTROL);
            contentDisposition = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_DISPOSITION);
            contentEncoding = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_ENCODING);
            contentLanguage = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_LANGUAGE);
            contentType = readStringAttributeIfPresent(view, attributes, XATTR_CONTENT_TYPE);
            if (contentType == null && autoDetectContentType) {
                contentType = probeContentType(file.toPath());
            }
            if (attributes.contains(XATTR_CONTENT_MD5)) {
                ByteBuffer buf = ByteBuffer.allocate(view.size(XATTR_CONTENT_MD5));
                view.read(XATTR_CONTENT_MD5, buf);
                hashCode = HashCode.fromBytes(buf.array());
            }
            if (attributes.contains(XATTR_EXPIRES)) {
                ByteBuffer buf = ByteBuffer.allocate(view.size(XATTR_EXPIRES));
                view.read(XATTR_EXPIRES, buf);
                buf.flip();
                expires = new Date(buf.asLongBuffer().get());
            }
            for (String attribute : attributes) {
                if (!attribute.startsWith(XATTR_USER_METADATA_PREFIX)) {
                    continue;
                }
                String value = readStringAttributeIfPresent(view, attributes, attribute);
                userMetadata.put(attribute.substring(XATTR_USER_METADATA_PREFIX.length()), value);
            }

            builder.payload(byteSource).cacheControl(cacheControl).contentDisposition(contentDisposition)
                    .contentEncoding(contentEncoding).contentLanguage(contentLanguage)
                    .contentLength(byteSource.size()).contentMD5(hashCode).contentType(contentType)
                    .expires(expires).userMetadata(userMetadata.build());
        } else {
            builder.payload(byteSource).contentLength(byteSource.size())
                    .contentMD5(byteSource.hash(Hashing.md5()).asBytes());
        }
    } catch (IOException e) {
        throw Throwables.propagate(e);
    }
    Blob blob = builder.build();
    blob.getMetadata().setContainer(container);
    blob.getMetadata().setLastModified(new Date(file.lastModified()));
    blob.getMetadata().setSize(file.length());
    if (blob.getPayload().getContentMetadata().getContentMD5() != null)
        blob.getMetadata()
                .setETag(base16().lowerCase().encode(blob.getPayload().getContentMetadata().getContentMD5()));
    return blob;
}

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