package is2.util; import is2.data.Long2IntInterface; /** * @author Bernd Bohnet, 01.09.2009 * * Maps for the Hash Kernel the long values to the int values. */ final public class Long2Int implements Long2IntInterface { public Long2Int() { size=115911564; } public Long2Int(int s) { size=s; } /** Integer counter for long2int */ final private int size; //0x03ffffff //0x07ffffff /* (non-Javadoc) * @see is2.sp09k9992.Long2IntIterface#size() */ public int size() {return size;} /* (non-Javadoc) * @see is2.sp09k9992.Long2IntIterface#start() * has no meaning for this implementation */ final public void start() {} /* (non-Javadoc) * @see is2.sp09k9992.Long2IntIterface#l2i(long) */ final public int l2i(long l) { if (l<0) return -1; // this works well LAS 88.138 // int r= (int)(( l ^ (l&0xffffffff00000000L) >>> 29 ));//0x811c9dc5 ^ // 29 // return Math.abs(r % size); // this works a bit better and good with 0x03ffffff // /* long r= l;//26 l = (l>>12)&0xfffffffffffff000L; r ^= l;//38 l = (l>>11)&0xffffffffffffc000L; r ^= l;//49 l = (l>>9)& 0xffffffffffff0000L; //53 r ^= l;//58 l = (l>>7)&0xfffffffffffc0000L; //62 r ^=l;//65 int x = (int)r; x = x % size; // return x >= 0 ? x : -x ;// Math.abs(r % size); */ // 26 0x03ffffff // together with 0x07ffffff 27 88.372 long r= l;// 27 l = (l>>13)&0xffffffffffffe000L; r ^= l; // 40 l = (l>>11)&0xffffffffffff0000L; r ^= l; // 51 l = (l>>9)& 0xfffffffffffc0000L; //53 r ^= l; // 60 l = (l>>7)& 0xfffffffffff00000L; //62 r ^=l; //67 int x = ((int)r) % size; return x >= 0 ? x : -x ; } }