2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0.
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 package gov.nasa.jpf.util;
21 * object to compute complex hash values that can be accumulated and
22 * delegated (to aggregates etc.)
23 * used to obtain hashcodes for states
25 public class HashData {
26 private static final int poly = 0x88888EEF;
33 public int getValue () {
34 return (m >>> 4) ^ (m & 15);
37 public void add (int value) {
48 public void add (long value){
49 add((int)(value ^ (value >>> 32)));
52 public void add (Object o) {
58 public void add (boolean b) {
59 // a clear case of '42', but that's the "official" boolean hashing