2. HashCode utilities.

Listing 2. HashCode utilities.


final class Utility {

 static final int hashCode(int source, boolean x) {
  return PRIME*source + (x ? 1 : 0);
 }
 
 static final int hashCode(int source, int x) {
  return PRIME*source + x;
 }
 
 static final int hashCode(int source, long x) {
  return PRIME*source + (int)(PRIME*(x >>> 32)
    + (x & 0xFFFFFFFF));
 }
 
 static final int hashCode(int source, float x) {
   return hashCode(source, x == 0.0F ? 0 : Float.floatToIntBits(x));
 }

 static final int hashCode(int source, double x) {
   return hashCode(source, x == 0.0 ? 0L :
    			Double.doubleToLongBits(x));
 }
 
 static final int hashCode(int source, Object x) {
  return (x == null) ? 0 : PRIME*source + x.hashCode();
 }

 static final int hashCode(int source, Object[] x) {
  for (int i = 0; i < x.length; ++i) {
    source = hashCode(source, x[i]);
  }
  return source;
 }
 // repeat for arrays of primitives,
 // arrays of arrays,... as required
}

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