Adds telephony repository and interactor.

This is needed for downstream dependencies to observe the call state.

Bug: 246631653
Test: Unit test included
Change-Id: If7f213dea82581e04620189ca3b13dea3295d9ae

packages/SystemUI/src/com/android/systemui/dagger/SystemUIModule.java

@@ -81,6 +81,7 @@ import com.android.systemui.statusbar.policy.ZenModeController;
 import com.android.systemui.statusbar.policy.dagger.SmartRepliesInflationModule;
 import com.android.systemui.statusbar.policy.dagger.StatusBarPolicyModule;
 import com.android.systemui.statusbar.window.StatusBarWindowModule;
+import com.android.systemui.telephony.data.repository.TelephonyRepositoryModule;
 import com.android.systemui.tuner.dagger.TunerModule;
 import com.android.systemui.unfold.SysUIUnfoldModule;
 import com.android.systemui.user.UserModule;
@@ -145,6 +146,7 @@ import dagger.Provides;
             StatusBarWindowModule.class,
             SysUIConcurrencyModule.class,
             SysUIUnfoldModule.class,
+            TelephonyRepositoryModule.class,
             TunerModule.class,
             UserModule.class,
             UtilModule.class,

packages/SystemUI/src/com/android/systemui/telephony/data/repository/TelephonyRepository.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 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
+ *
+ *      http://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.android.systemui.telephony.data.repository
+
+import android.telephony.Annotation
+import android.telephony.TelephonyCallback
+import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.telephony.TelephonyListenerManager
+import javax.inject.Inject
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+
+/** Defines interface for classes that encapsulate _some_ telephony-related state. */
+interface TelephonyRepository {
+    /** The state of the current call. */
+    @Annotation.CallState val callState: Flow<Int>
+}
+
+/**
+ * NOTE: This repository tracks only telephony-related state regarding the default mobile
+ * subscription. `TelephonyListenerManager` does not create new instances of `TelephonyManager` on a
+ * per-subscription basis and thus will always be tracking telephony information regarding
+ * `SubscriptionManager.getDefaultSubscriptionId`. See `TelephonyManager` and `SubscriptionManager`
+ * for more documentation.
+ */
+@SysUISingleton
+class TelephonyRepositoryImpl
+@Inject
+constructor(
+    private val manager: TelephonyListenerManager,
+) : TelephonyRepository {
+    @Annotation.CallState
+    override val callState: Flow<Int> = conflatedCallbackFlow {
+        val listener = TelephonyCallback.CallStateListener { state -> trySend(state) }
+
+        manager.addCallStateListener(listener)
+
+        awaitClose { manager.removeCallStateListener(listener) }
+    }
+}

packages/SystemUI/src/com/android/systemui/telephony/data/repository/TelephonyRepositoryModule.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 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
+ *
+ *      http://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.android.systemui.telephony.data.repository
+
+import dagger.Binds
+import dagger.Module
+
+@Module
+interface TelephonyRepositoryModule {
+    @Binds fun repository(impl: TelephonyRepositoryImpl): TelephonyRepository
+}

packages/SystemUI/src/com/android/systemui/telephony/domain/interactor/TelephonyInteractor.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 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
+ *
+ *      http://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.android.systemui.telephony.domain.interactor
+
+import android.telephony.Annotation
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.telephony.data.repository.TelephonyRepository
+import javax.inject.Inject
+import kotlinx.coroutines.flow.Flow
+
+/** Hosts business logic related to telephony. */
+@SysUISingleton
+class TelephonyInteractor
+@Inject
+constructor(
+    repository: TelephonyRepository,
+) {
+    @Annotation.CallState val callState: Flow<Int> = repository.callState
+}

packages/SystemUI/tests/src/com/android/systemui/telephony/data/repository/TelephonyRepositoryImplTest.kt

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 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
+ *
+ *      http://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.android.systemui.telephony.data.repository
+
+import android.telephony.TelephonyCallback
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.telephony.TelephonyListenerManager
+import com.android.systemui.util.mockito.kotlinArgumentCaptor
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.runBlocking
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+import org.mockito.Mock
+import org.mockito.Mockito.verify
+import org.mockito.MockitoAnnotations
+
+@SmallTest
+@RunWith(JUnit4::class)
+class TelephonyRepositoryImplTest : SysuiTestCase() {
+
+    @Mock private lateinit var manager: TelephonyListenerManager
+
+    private lateinit var underTest: TelephonyRepositoryImpl
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+
+        underTest =
+            TelephonyRepositoryImpl(
+                manager = manager,
+            )
+    }
+
+    @Test
+    fun callState() =
+        runBlocking(IMMEDIATE) {
+            var callState: Int? = null
+            val job = underTest.callState.onEach { callState = it }.launchIn(this)
+            val listenerCaptor = kotlinArgumentCaptor<TelephonyCallback.CallStateListener>()
+            verify(manager).addCallStateListener(listenerCaptor.capture())
+            val listener = listenerCaptor.value
+
+            listener.onCallStateChanged(0)
+            assertThat(callState).isEqualTo(0)
+
+            listener.onCallStateChanged(1)
+            assertThat(callState).isEqualTo(1)
+
+            listener.onCallStateChanged(2)
+            assertThat(callState).isEqualTo(2)
+
+            job.cancel()
+
+            verify(manager).removeCallStateListener(listener)
+        }
+
+    companion object {
+        private val IMMEDIATE = Dispatchers.Main.immediate
+    }
+}

packages/SystemUI/tests/utils/src/com/android/systemui/telephony/data/repository/FakeTelephonyRepository.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 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
+ *
+ *      http://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.android.systemui.telephony.data.repository
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+class FakeTelephonyRepository : TelephonyRepository {
+
+    private val _callState = MutableStateFlow(0)
+    override val callState: Flow<Int> = _callState.asStateFlow()
+
+    fun setCallState(value: Int) {
+        _callState.value = value
+    }
+}