Scala example source code file (Statics.java)

This example Scala source code file (Statics.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

runtime, statics

The Statics.java Scala example source code

package scala.runtime;

/** Not for public consumption.  Usage by the runtime only.
 */

public final class Statics {
  public static int mix(int hash, int data) {
    int h = mixLast(hash, data);
    h = Integer.rotateLeft(h, 13);
    return h * 5 + 0xe6546b64;
  }

  public static int mixLast(int hash, int data) {
    int k = data;

    k *= 0xcc9e2d51;
    k = Integer.rotateLeft(k, 15);
    k *= 0x1b873593;

    return hash ^ k;
  }

  public static int finalizeHash(int hash, int length) {
    return avalanche(hash ^ length);
  }

  /** Force all bits of the hash to avalanche. Used for finalizing the hash. */
  public static int avalanche(int h) {
    h ^= h >>> 16;
    h *= 0x85ebca6b;
    h ^= h >>> 13;
    h *= 0xc2b2ae35;
    h ^= h >>> 16;

    return h;
  }

  public static int longHash(long lv) {
    if ((int)lv == lv)
      return (int)lv;
    else
      return (int)(lv ^ (lv >>> 32));
  }

  public static int doubleHash(double dv) {
    int iv = (int)dv;
    if (iv == dv)
      return iv;

    float fv = (float)dv;
    if (fv == dv)
      return java.lang.Float.floatToIntBits(fv);

    long lv = (long)dv;
    if (lv == dv)
      return (int)lv;

    lv = Double.doubleToLongBits(dv);
    return (int)(lv ^ (lv >>> 32));
  }

  public static int floatHash(float fv) {
    int iv = (int)fv;
    if (iv == fv)
      return iv;

    long lv = (long)fv;
    if (lv == fv)
      return (int)(lv^(lv>>>32));

    return java.lang.Float.floatToIntBits(fv);
  }

  public static int anyHash(Object x) {
    if (x == null)
      return 0;

    if (x instanceof java.lang.Long)
      return longHash(((java.lang.Long)x).longValue());

    if (x instanceof java.lang.Double)
      return doubleHash(((java.lang.Double)x).doubleValue());

    if (x instanceof java.lang.Float)
      return floatHash(((java.lang.Float)x).floatValue());

    return x.hashCode();
  }
}