Example usage for org.apache.lucene.util SmallFloat floatToByte315

Introduction

In this page you can find the example usage for org.apache.lucene.util SmallFloat floatToByte315.

Prototype

public static byte floatToByte315(float f) 

Source Link

Document

floatToByte(b, mantissaBits=3, zeroExponent=15)
smallest non-zero value = 5.820766E-10
largest value = 7.5161928E9
epsilon = 0.125

Usage

From source file:BM25LSimilarity.java

License:Apache License

/**
 * The default implementation encodes <code>boost / sqrt(length)</code> with
 * {@link SmallFloat#floatToByte315(float)}. This is compatible with
 * Lucene's default implementation. If you change this, then you should
 * change {@link #decodeNormValue(byte)} to match.
 *///from  w w  w  . j  a  v  a2  s  . c om
protected byte encodeNormValue(float boost, int fieldLength) {
    return SmallFloat.floatToByte315(boost / (float) Math.sqrt(fieldLength));
}

---

From source file:com.core.nlp.similarity.DefaultSimilarity.java

License:Apache License

/**
 * Encodes a normalization factor for storage in an index.
 * <p/>//w  ww  .  j  a  v a 2  s .  com
 * The encoding uses a three-bit mantissa, a five-bit exponent, and the
 * zero-exponent point at 15, thus representing values from around 7x10^9 to
 * 2x10^-9 with about one significant decimal digit of accuracy. Zero is also
 * represented. Negative numbers are rounded up to zero. Values too large to
 * represent are rounded down to the largest representable value. Positive
 * values too small to represent are rounded up to the smallest positive
 * representable value.
 *
 * @see org.apache.lucene.document.Field#setBoost(float)
 * @see org.apache.lucene.util.SmallFloat
 */
@Override
public final long encodeNormValue(float f) {
    return SmallFloat.floatToByte315(f);
}

---

From source file:elhuyar.bilakit.SimilarityCLIRFactory.java

License:Open Source License

/**
 * Encodes a normalization factor for storage in an index.
 * <p>/*from w  w  w  .  j  ava  2 s  .c  o  m*/
 * The encoding uses a three-bit mantissa, a five-bit exponent, and the
 * zero-exponent point at 15, thus representing values from around 7x10^9 to
 * 2x10^-9 with about one significant decimal digit of accuracy. Zero is also
 * represented. Negative numbers are rounded up to zero. Values too large to
 * represent are rounded down to the largest representable value. Positive
 * values too small to represent are rounded up to the smallest positive
 * representable value.
 * 
 * @see org.apache.lucene.document.Field#setBoost(float)
 * @see org.apache.lucene.util.SmallFloat
 */
public final long encodeNormValue(float f) {
    return SmallFloat.floatToByte315(f);
}

---

From source file:org.codelibs.elasticsearch.common.lucene.all.AllTokenStream.java

License:Apache License

AllTokenStream(TokenStream input, float boost) {
    super(input);
    payloadAttribute = addAttribute(PayloadAttribute.class);
    payloadSpare.bytes[0] = SmallFloat.floatToByte315(boost);
}

---

From source file:org.dice.solrenhancements.similarity.DiceDefaultSimilarity.java

License:Apache License

/**
 * Encodes a normalization factor for storage in an index.
 * <p>/*from  www. j  a  va  2  s. c  o m*/
 * The encoding uses a three-bit mantissa, a five-bit exponent, and the
 * zero-exponent point at 15, thus representing values from around 7x10^9 to
 * 2x10^-9 with about one significant decimal digit of accuracy. Zero is also
 * represented. Negative numbers are rounded up to zero. Values too large to
 * represent are rounded down to the largest representable value. Positive
 * values too small to represent are rounded up to the smallest positive
 * representable value.
 *
 * @see org.apache.lucene.document.Field#setBoost(float)
 * @see org.apache.lucene.util.SmallFloat
 */
@Override
public long encodeNormValue(float f) {
    return SmallFloat.floatToByte315(f);
}

---

From source file:org.elasticsearch.index.similarity.ClosedSimilarity.java

/** The default implementation encodes <code>boost / sqrt(length)</code>
 * with {@link SmallFloat#floatToByte315(float)}.  This is compatible with 
 * Lucene's default implementation.  If you change this, then you should 
 * change {@link #decodeNormValue(byte)} to match. */
protected byte encodeNormValue(float boost, int fieldLength) {

    byte encValue = SmallFloat.floatToByte315(boost / (float) Math.sqrt(fieldLength));
    log.info("Encoding value: Boost: " + boost + " fieldLEngth: " + fieldLength + " encByte: " + encValue);
    return encValue;
}

---

From source file:org.meresco.lucene.search.join.ScoreSuperCollector.java

License:Open Source License

@Override
public void collect(int doc) throws IOException {
    if (this.keyValues != null) {
        int value = (int) this.keyValues.get(doc);
        if (value > 0) {
            if (value >= this.scores.length) {
                this.scores = ScoreSuperCollector.resize(this.scores, (int) ((value + 1) * 1.25));
            }/*from   w ww  .  j a  v  a  2  s.co  m*/
            this.scores[value] = SmallFloat.floatToByte315(scorer.score());
        }
    }
}

---