1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package dexfuzz;
18 
19 import java.util.ArrayList;
20 import java.util.HashMap;
21 import java.util.List;
22 import java.util.Map;
23 
24 /**
25  * A wrapper for a dictionary tracking what mutations have been performed.
26  */
27 public class MutationStats {
28 
29   public static class StatNotFoundException extends RuntimeException {
30     private static final long serialVersionUID = -7038515184655168470L;
31   }
32 
33   private Map<String,Long> stats;
34   private List<String> statsOrder;
35 
MutationStats()36   public MutationStats() {
37     stats = new HashMap<String,Long>();
38     statsOrder = new ArrayList<String>();
39   }
40 
incrementStat(String statName)41   public void incrementStat(String statName) {
42     increaseStat(statName, 1);
43   }
44 
45   /**
46    * Increase the named stat by the specified amount.
47    */
increaseStat(String statName, long amt)48   public void increaseStat(String statName, long amt) {
49     if (!stats.containsKey(statName)) {
50       stats.put(statName, 0L);
51       statsOrder.add(statName);
52     }
53     stats.put(statName, stats.get(statName) + amt);
54   }
55 
56   /**
57    * Get a string representing the collected stats - looks like a JSON dictionary.
58    */
getStatsString()59   public String getStatsString() {
60     StringBuilder builder = new StringBuilder();
61     builder.append("{");
62     boolean first = true;
63     for (String statName : statsOrder) {
64       if (!first) {
65         builder.append(", ");
66       } else {
67         first = false;
68       }
69       builder.append("\"").append(statName).append("\": ").append(stats.get(statName));
70     }
71     builder.append("}");
72     return builder.toString();
73   }
74 }
75