Replace StringDecoder injection with simpler API

The initial reason for this `StringDecoder` was to make sure the AndroidX navigation route would not use incompatible chars in the resulting String.

For that, `Uri.encode(String)` was used, but this is an Android API (`android.net.Uri`).
Unit tests would fail because Uri is not mocked (since we are not using Robolectric).
Therefore, a `StringDecoder` interface was introduced with 2 implementations: `UriDecoder` and `FakeStringDecoder`, Hilt modules were added, etc.
FWIW, the naming of the API was misleading: `StringDecoder.decodeString(encodedString: String)` does not inform how encoded the input is, so `UriDecoder` could "decode" something that was not necessarily uri "encoded".

The solution to this problem was to simply use regular Java APIs:
- `URLDecoder.decode(urlEncodedTopicId, "UTF-8")`
- `URLEncoder.encode(topicId, "UTF-8")`

core/common/src/main/java/com/google/samples/apps/nowinandroid/core/decoder/StringDecoder.kt

@@ -1,21 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.google.samples.apps.nowinandroid.core.decoder
-
-interface StringDecoder {
-    fun decodeString(encodedString: String): String
-}

core/common/src/main/java/com/google/samples/apps/nowinandroid/core/decoder/UriDecoder.kt

@@ -1,24 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.google.samples.apps.nowinandroid.core.decoder
-
-import android.net.Uri
-import javax.inject.Inject
-
-class UriDecoder @Inject constructor() : StringDecoder {
-    override fun decodeString(encodedString: String): String = Uri.decode(encodedString)
-}

core/common/src/main/java/com/google/samples/apps/nowinandroid/core/decoder/di/StringDecoderModule.kt

@@ -1,31 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.google.samples.apps.nowinandroid.core.decoder.di
-
-import com.google.samples.apps.nowinandroid.core.decoder.StringDecoder
-import com.google.samples.apps.nowinandroid.core.decoder.UriDecoder
-import dagger.Binds
-import dagger.Module
-import dagger.hilt.InstallIn
-import dagger.hilt.components.SingletonComponent
-
-@Module
-@InstallIn(SingletonComponent::class)
-abstract class StringDecoderModule {
-    @Binds
-    abstract fun bindStringDecoder(uriDecoder: UriDecoder): StringDecoder
-}

core/testing/src/main/java/com/google/samples/apps/nowinandroid/core/testing/decoder/FakeStringDecoder.kt

@@ -1,24 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.google.samples.apps.nowinandroid.core.testing.decoder
-
-import com.google.samples.apps.nowinandroid.core.decoder.StringDecoder
-import javax.inject.Inject
-
-class FakeStringDecoder @Inject constructor() : StringDecoder {
-    override fun decodeString(encodedString: String): String = encodedString
-}

core/testing/src/main/java/com/google/samples/apps/nowinandroid/core/testing/di/TestStringDecoderModule.kt

@@ -1,35 +0,0 @@
-/*
- * Copyright 2022 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.google.samples.apps.nowinandroid.core.testing.di
-
-import com.google.samples.apps.nowinandroid.core.decoder.StringDecoder
-import com.google.samples.apps.nowinandroid.core.decoder.di.StringDecoderModule
-import com.google.samples.apps.nowinandroid.core.testing.decoder.FakeStringDecoder
-import dagger.Binds
-import dagger.Module
-import dagger.hilt.components.SingletonComponent
-import dagger.hilt.testing.TestInstallIn
-
-@Module
-@TestInstallIn(
-    components = [SingletonComponent::class],
-    replaces = [StringDecoderModule::class],
-)
-abstract class TestStringDecoderModule {
-    @Binds
-    abstract fun bindsStringDecoder(fakeStringDecoder: FakeStringDecoder): StringDecoder
-}

feature/topic/src/main/java/com/google/samples/apps/nowinandroid/feature/topic/TopicViewModel.kt

@@ -23,7 +23,6 @@ import com.google.samples.apps.nowinandroid.core.data.repository.NewsResourceQue
 import com.google.samples.apps.nowinandroid.core.data.repository.TopicsRepository
 import com.google.samples.apps.nowinandroid.core.data.repository.UserDataRepository
 import com.google.samples.apps.nowinandroid.core.data.repository.UserNewsResourceRepository
-import com.google.samples.apps.nowinandroid.core.decoder.StringDecoder
 import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
 import com.google.samples.apps.nowinandroid.core.model.data.UserNewsResource
@@ -43,13 +42,12 @@ import javax.inject.Inject
 @HiltViewModel
 class TopicViewModel @Inject constructor(
     savedStateHandle: SavedStateHandle,
-    stringDecoder: StringDecoder,
     private val userDataRepository: UserDataRepository,
     topicsRepository: TopicsRepository,
     userNewsResourceRepository: UserNewsResourceRepository,
 ) : ViewModel() {
 
-    private val topicArgs: TopicArgs = TopicArgs(savedStateHandle, stringDecoder)
+    private val topicArgs: TopicArgs = TopicArgs(savedStateHandle)
 
     val topicId = topicArgs.topicId
 

feature/topic/src/main/java/com/google/samples/apps/nowinandroid/feature/topic/navigation/TopicNavigation.kt

@@ -16,7 +16,6 @@
 
 package com.google.samples.apps.nowinandroid.feature.topic.navigation
 
-import android.net.Uri
 import androidx.annotation.VisibleForTesting
 import androidx.lifecycle.SavedStateHandle
 import androidx.navigation.NavController
@@ -24,19 +23,20 @@ import androidx.navigation.NavGraphBuilder
 import androidx.navigation.NavType
 import androidx.navigation.compose.composable
 import androidx.navigation.navArgument
-import com.google.samples.apps.nowinandroid.core.decoder.StringDecoder
 import com.google.samples.apps.nowinandroid.feature.topic.TopicRoute
+import java.net.URLDecoder
+import java.net.URLEncoder
 
 @VisibleForTesting
 internal const val topicIdArg = "topicId"
 
 internal class TopicArgs(val topicId: String) {
-    constructor(savedStateHandle: SavedStateHandle, stringDecoder: StringDecoder) :
+    constructor(savedStateHandle: SavedStateHandle) :
-        this(stringDecoder.decodeString(checkNotNull(savedStateHandle[topicIdArg])))
+        this(URLDecoder.decode(checkNotNull(savedStateHandle[topicIdArg]), "UTF-8"))
 }
 
 fun NavController.navigateToTopic(topicId: String) {
-    val encodedId = Uri.encode(topicId)
+    val encodedId = URLEncoder.encode(topicId, "UTF-8")
     this.navigate("topic_route/$encodedId") {
         launchSingleTop = true
     }

feature/topic/src/test/java/com/google/samples/apps/nowinandroid/feature/topic/TopicViewModelTest.kt

@@ -22,7 +22,6 @@ import com.google.samples.apps.nowinandroid.core.model.data.FollowableTopic
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResource
 import com.google.samples.apps.nowinandroid.core.model.data.NewsResourceType.Video
 import com.google.samples.apps.nowinandroid.core.model.data.Topic
-import com.google.samples.apps.nowinandroid.core.testing.decoder.FakeStringDecoder
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestNewsRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestTopicsRepository
 import com.google.samples.apps.nowinandroid.core.testing.repository.TestUserDataRepository
@@ -63,7 +62,6 @@ class TopicViewModelTest {
     fun setup() {
         viewModel = TopicViewModel(
             savedStateHandle = SavedStateHandle(mapOf(topicIdArg to testInputTopics[0].topic.id)),
-            stringDecoder = FakeStringDecoder(),
             userDataRepository = userDataRepository,
             topicsRepository = topicsRepository,
             userNewsResourceRepository = userNewsResourceRepository,