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
17package dexfuzz;
18
19import java.util.ArrayList;
20import java.util.HashMap;
21import java.util.List;
22import java.util.Map;
23
24/**
25 * A wrapper for a dictionary tracking what mutations have been performed.
26 */
27public 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
36  public MutationStats() {
37    stats = new HashMap<String,Long>();
38    statsOrder = new ArrayList<String>();
39  }
40
41  public void incrementStat(String statName) {
42    increaseStat(statName, 1);
43  }
44
45  /**
46   * Increase the named stat by the specified amount.
47   */
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   */
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