1 files changed, 89 insertions, 0 deletions
diff --git a/src/com/android/car/messenger/core/ui/conversationlist/ConversationListViewModel.java b/src/com/android/car/messenger/core/ui/conversationlist/ConversationListViewModel.java
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+++ b/src/com/android/car/messenger/core/ui/conversationlist/ConversationListViewModel.java
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+/*
+ * Copyright (C) 2018 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.car.messenger.core.ui.conversationlist;
+
+import android.annotation.SuppressLint;
+import android.app.Application;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MediatorLiveData;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.android.car.messenger.core.interfaces.AppFactory;
+import com.android.car.messenger.core.interfaces.DataModel;
+import com.android.car.messenger.core.models.UserAccount;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/** View model for ConversationLogFragment which provides message history live data. */
+public class ConversationListViewModel extends AndroidViewModel {
+    @SuppressLint("StaticFieldLeak")
+    @NonNull
+    private final DataModel mDataModel;
+
+    @Nullable private UserAccount mUserAccount;
+    @Nullable private LiveData<UIConversationLog> mUIConversationLogLiveData;
+
+    public ConversationListViewModel(@NonNull Application application) {
+        super(application);
+        mDataModel = AppFactory.get().getDataModel();
+    }
+
+    /**
+     * Gets an observable {@link UIConversationLog} for the connected account
+     *
+     * <p>The observable emits the following: - {@link UIConversationLog#isLoading()} returns true
+     * when loading - {@link UIConversationLog#getConnectionStatus()} returns appropriate connection
+     * status, such as connected or disconnected - {@link UIConversationLog#getData()} returns a
+     * non-null list of {@link UIConversationItem}, or empty if no items found
+     */
+    @NonNull
+    public LiveData<UIConversationLog> getConversations(@Nullable UserAccount userAccount) {
+        if (userAccount == null) {
+            MediatorLiveData<UIConversationLog> mutableLiveData = new MediatorLiveData<>();
+            mutableLiveData.postValue(UIConversationLog.getDisconnectedState());
+            return mutableLiveData;
+        }
+        if (mUserAccount != null
+                && mUserAccount.getId() == userAccount.getId()
+                && mUIConversationLogLiveData != null) {
+            return mUIConversationLogLiveData;
+        }
+        mUserAccount = userAccount;
+        mUIConversationLogLiveData = createUIConversationLog(mUserAccount);
+        return mUIConversationLogLiveData;
+    }
+
+    private LiveData<UIConversationLog> createUIConversationLog(@NonNull UserAccount userAccount) {
+        MediatorLiveData<UIConversationLog> mutableLiveData = new MediatorLiveData<>();
+        mutableLiveData.postValue(UIConversationLog.getLoadingState());
+        mutableLiveData.addSource(
+                mDataModel.getConversations(userAccount),
+                list -> {
+                    List<UIConversationItem> data =
+                            list.stream()
+                                    .map(UIConversationItemConverter::convertToUIConversationItem)
+                                    .collect(Collectors.toList());
+                    UIConversationLog log = UIConversationLog.getLoadedState(data);
+                    mutableLiveData.postValue(log);
+                });
+        return mutableLiveData;
+    }
+}