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.program;
18 
19 import dexfuzz.program.mutators.CodeMutator;
20 
21 /**
22  * Mutation should be subclassed by an AssociatedMutation in each CodeMutator,
23  * which will describe the parameters of the mutation, and override the getString()
24  * and parseString() methods here to allow serialization of the mutations.
25  */
26 public abstract class Mutation {
27 
28   public MutatableCode mutatableCode;
29 
30   // The first field of any serialized mutation - the mutator that uses it.
31   public Class<? extends CodeMutator> mutatorClass;
32   // The second field of any serialized mutation...
33   // This is an index into the Program's list of MutatableCodes
34   // i.e., it is NOT an index into the DEX file's CodeItems!
35   public int mutatableCodeIdx;
36 
setup(Class<? extends CodeMutator> mutatorClass, MutatableCode mutatableCode)37   public void setup(Class<? extends CodeMutator> mutatorClass, MutatableCode mutatableCode) {
38     this.mutatorClass = mutatorClass;
39     this.mutatableCode = mutatableCode;
40     this.mutatableCodeIdx = mutatableCode.mutatableCodeIdx;
41   }
42   /**
43    * Serializes the field(s) of the mutation to string format.
44    * The fields are separated by a space.
45    * @return the serialized string representation of the field(s) of the mutation.
46    */
getString()47   public abstract String getString();
48 
49   /**
50    * Deserializes the strings back to the field(s) of the mutation,
51    * given a string array as its argument. The string array
52    * contains the individual elements which were previously constructed by
53    * getstring() method. elements[0] stores the class name and elements[1]
54    * stores the mutable code index which are predefined in MutationSerializer.java.
55    * Users can deserialize the string representation in elements[2] and so forth.
56    * @param elements string array with serialized representations of the field(s) of the mutation.
57    */
parseString(String[] elements)58   public abstract void parseString(String[] elements);
59 }