1 /*
2  * Copyright 2020 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 androidx.datastore.core
18 
19 import androidx.datastore.TestingSerializerConfig
20 import java.io.IOException
21 import java.io.InputStream
22 import java.io.OutputStream
23 
24 class TestingSerializer(
25     private val config: TestingSerializerConfig = TestingSerializerConfig(),
26 ) : Serializer<Byte> {
readFromnull27     override suspend fun readFrom(input: InputStream): Byte {
28         // hack to make failReadWithCorruptionException during runtime
29         var failReadWithCorruptionException = config.failReadWithCorruptionException
30         if (!config.listOfFailReadWithCorruptionException.isEmpty()) {
31             failReadWithCorruptionException = config.listOfFailReadWithCorruptionException.get(0)
32             config.listOfFailReadWithCorruptionException =
33                 config.listOfFailReadWithCorruptionException.drop(1)
34         }
35         if (failReadWithCorruptionException) {
36             throw CorruptionException("CorruptionException", IOException())
37         }
38 
39         if (config.failingRead) {
40             throw IOException("I was asked to fail on reads")
41         }
42 
43         val read = input.read()
44         if (read == -1) {
45             return 0
46         }
47         return read.toByte()
48     }
49 
writeTonull50     override suspend fun writeTo(t: Byte, output: OutputStream) {
51         config.writeCount++
52         if (config.failingWrite) {
53             throw IOException("I was asked to fail on writes")
54         }
55         output.write(t.toInt())
56     }
57 
58     override val defaultValue: Byte
59         get() = config.defaultValue
60 }
61