Example usage for java.io ObjectOutput writeBytes

Introduction

In this page you can find the example usage for java.io ObjectOutput writeBytes.

Prototype

void writeBytes(String s) throws IOException;

Source Link

Document

Writes a string to the output stream.

Usage

From source file:com.facebook.presto.bloomfilter.BloomFilter.java

public Slice serialize() {
    byte[] bytes = new byte[0];
    byte[] bytesPre = new byte[0];
    try {/* w  ww .  j  a v  a  2 s. c  o  m*/
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        ObjectOutput output = new ObjectOutputStream(buffer);
        output.writeObject(instance);
        bytes = buffer.toByteArray();

        ByteArrayOutputStream bufferPre = new ByteArrayOutputStream();
        ObjectOutput outputPre = new ObjectOutputStream(bufferPre);
        outputPre.writeObject(instancePreFilter);
        bytesPre = bufferPre.toByteArray();
    } catch (Exception ix) {
        log.error(ix);
    }

    // Create hash
    byte[] bfHash = Hashing.sha256().hashBytes(bytes).asBytes();

    // Compress
    byte[] compressed;
    try {
        compressed = compress(bytes);
    } catch (IOException ix) {
        log.error(ix);
        compressed = new byte[0];
    }
    int size = compressed.length;

    // Compress
    byte[] compressedPre;
    try {
        compressedPre = compress(bytesPre);
    } catch (IOException ix) {
        log.error(ix);
        compressedPre = new byte[0];
    }
    int sizePre = compressedPre.length;

    // To slice
    DynamicSliceOutput output = new DynamicSliceOutput(size);

    // Write hash
    output.writeBytes(bfHash); // 32 bytes

    // Write the length of the bloom filter
    output.appendInt(size);

    // Write the length of the pre bloom filter
    output.appendInt(sizePre);

    // Params
    output.appendInt(expectedInsertions);
    output.appendDouble(falsePositivePercentage);

    // Write the bloom filter
    output.appendBytes(compressed);

    // Write the bloom filter
    output.appendBytes(compressedPre);

    return output.slice();
}

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