| /* |
| * 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 android.view.textclassifier; |
| |
| import android.annotation.NonNull; |
| import android.app.Person; |
| import android.text.TextUtils; |
| import android.util.ArrayMap; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| |
| import com.google.android.textclassifier.ActionsSuggestionsModel; |
| |
| import java.util.ArrayDeque; |
| import java.util.ArrayList; |
| import java.util.Deque; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Helper class for action suggestions. |
| * |
| * @hide |
| */ |
| @VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE) |
| public final class ActionsSuggestionsHelper { |
| private static final int USER_LOCAL = 0; |
| private static final int FIRST_NON_LOCAL_USER = 1; |
| |
| private ActionsSuggestionsHelper() {} |
| |
| /** |
| * Converts the messages to a list of native messages object that the model can understand. |
| * <p> |
| * User id encoding - local user is represented as 0, Other users are numbered according to |
| * how far before they spoke last time in the conversation. For example, considering this |
| * conversation: |
| * <ul> |
| * <li> User A: xxx |
| * <li> Local user: yyy |
| * <li> User B: zzz |
| * </ul> |
| * User A will be encoded as 2, user B will be encoded as 1 and local user will be encoded as 0. |
| */ |
| @NonNull |
| public static ActionsSuggestionsModel.ConversationMessage[] toNativeMessages( |
| @NonNull List<ConversationActions.Message> messages) { |
| List<ConversationActions.Message> messagesWithText = |
| messages.stream() |
| .filter(message -> !TextUtils.isEmpty(message.getText())) |
| .collect(Collectors.toCollection(ArrayList::new)); |
| if (messagesWithText.isEmpty()) { |
| return new ActionsSuggestionsModel.ConversationMessage[0]; |
| } |
| int size = messagesWithText.size(); |
| // If the last message (the most important one) does not have the Person object, we will |
| // just use the last message and consider this message is sent from a remote user. |
| ConversationActions.Message lastMessage = messages.get(size - 1); |
| boolean useLastMessageOnly = lastMessage.getAuthor() == null; |
| if (useLastMessageOnly) { |
| return new ActionsSuggestionsModel.ConversationMessage[]{ |
| new ActionsSuggestionsModel.ConversationMessage( |
| FIRST_NON_LOCAL_USER, |
| lastMessage.getText().toString())}; |
| } |
| |
| // Encode the messages in the reverse order, stop whenever the Person object is missing. |
| Deque<ActionsSuggestionsModel.ConversationMessage> nativeMessages = new ArrayDeque<>(); |
| PersonEncoder personEncoder = new PersonEncoder(); |
| for (int i = size - 1; i >= 0; i--) { |
| ConversationActions.Message message = messagesWithText.get(i); |
| if (message.getAuthor() == null) { |
| break; |
| } |
| nativeMessages.push(new ActionsSuggestionsModel.ConversationMessage( |
| personEncoder.encode(message.getAuthor()), |
| message.getText().toString())); |
| } |
| return nativeMessages.toArray( |
| new ActionsSuggestionsModel.ConversationMessage[nativeMessages.size()]); |
| } |
| |
| private static final class PersonEncoder { |
| private final Map<Person, Integer> mMapping = new ArrayMap<>(); |
| private int mNextUserId = FIRST_NON_LOCAL_USER; |
| |
| private int encode(Person person) { |
| if (ConversationActions.Message.PERSON_USER_LOCAL.equals(person)) { |
| return USER_LOCAL; |
| } |
| Integer result = mMapping.get(person); |
| if (result == null) { |
| mMapping.put(person, mNextUserId); |
| result = mNextUserId; |
| mNextUserId++; |
| } |
| return result; |
| } |
| } |
| } |