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      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 
     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