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 * simple result wrapper that can store a boolean value and a String, to
22 * be used as method return value if we have to keep exceptions in the callee
26 public static final Result OK = new Result();
28 // final so that we don't need getters
29 public final String error;
31 // if you need a positive result, use OK
36 private Result (String errorMsg){
41 public boolean equals(Object o){
42 // we only compare if there was an error, not which one
43 if (o instanceof Boolean){
44 return (error == null) == (Boolean)o;
45 } else if (o instanceof Result){
46 return (error == null) == (((Result)o).error == null);
51 public static Result failure (String errorMsg){
52 return new Result(errorMsg);