| /* |
| * 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.app.Person; |
| import android.content.Context; |
| 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.Locale; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.StringJoiner; |
| import java.util.function.Function; |
| 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. |
| */ |
| public static ActionsSuggestionsModel.ConversationMessage[] toNativeMessages( |
| List<ConversationActions.Message> messages, |
| Function<CharSequence, String> languageDetector) { |
| 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]; |
| } |
| Deque<ActionsSuggestionsModel.ConversationMessage> nativeMessages = new ArrayDeque<>(); |
| PersonEncoder personEncoder = new PersonEncoder(); |
| int size = messagesWithText.size(); |
| for (int i = size - 1; i >= 0; i--) { |
| ConversationActions.Message message = messagesWithText.get(i); |
| long referenceTime = message.getReferenceTime() == null |
| ? 0 |
| : message.getReferenceTime().toInstant().toEpochMilli(); |
| nativeMessages.push(new ActionsSuggestionsModel.ConversationMessage( |
| personEncoder.encode(message.getAuthor()), |
| message.getText().toString(), referenceTime, |
| languageDetector.apply(message.getText()))); |
| } |
| return nativeMessages.toArray( |
| new ActionsSuggestionsModel.ConversationMessage[nativeMessages.size()]); |
| } |
| |
| /** |
| * Returns the result id for logging. |
| */ |
| public static String createResultId( |
| Context context, |
| List<ConversationActions.Message> messages, |
| int modelVersion, |
| List<Locale> modelLocales) { |
| final StringJoiner localesJoiner = new StringJoiner(","); |
| for (Locale locale : modelLocales) { |
| localesJoiner.add(locale.toLanguageTag()); |
| } |
| final String modelName = String.format( |
| Locale.US, "%s_v%d", localesJoiner.toString(), modelVersion); |
| final int hash = Objects.hash( |
| messages.stream() |
| .map(ConversationActions.Message::getText) |
| .collect(Collectors.toList()), |
| context.getPackageName()); |
| return SelectionSessionLogger.SignatureParser.createSignature( |
| SelectionSessionLogger.CLASSIFIER_ID, modelName, hash); |
| } |
| |
| 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; |
| } |
| } |
| } |