Introduce Message.USER_LOCAL and added logic to map person to user id

1. Introduce Message.USER_LOCAL to allow caller to specify which
   message is from the local user.

2. TextClassifierImpl will now encode the Person object to a user
   id.

3. Fixed a bug in Person.equals check

BUG: 111437455
BUG: 111406942

Test: atest frameworks/base/core/tests/coretests/src/android/view/textclassifier/ActionsSuggestionsHelperTest.java

Change-Id: I6629f42244a402fa210f87afa88a629c2ca4a510
diff --git a/api/current.txt b/api/current.txt
index e84bc8d..b719c46 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -51896,6 +51896,7 @@
     method public java.time.ZonedDateTime getTime();
     method public void writeToParcel(android.os.Parcel, int);
     field public static final android.os.Parcelable.Creator<android.view.textclassifier.ConversationActions.Message> CREATOR;
+    field public static final android.app.Person PERSON_USER_LOCAL;
   }
 
   public static final class ConversationActions.Message.Builder {
diff --git a/api/system-current.txt b/api/system-current.txt
index bf2c357..7bd9ad5 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -441,10 +441,10 @@
   }
 
   public class KeyguardManager {
-    method public void setPrivateNotificationsAllowed(boolean);
-    method public boolean getPrivateNotificationsAllowed();
     method public android.content.Intent createConfirmFactoryResetCredentialIntent(java.lang.CharSequence, java.lang.CharSequence, java.lang.CharSequence);
+    method public boolean getPrivateNotificationsAllowed();
     method public void requestDismissKeyguard(android.app.Activity, java.lang.CharSequence, android.app.KeyguardManager.KeyguardDismissCallback);
+    method public void setPrivateNotificationsAllowed(boolean);
   }
 
   public class Notification implements android.os.Parcelable {
diff --git a/core/java/android/app/Person.java b/core/java/android/app/Person.java
index a2dae3b..0abc998 100644
--- a/core/java/android/app/Person.java
+++ b/core/java/android/app/Person.java
@@ -127,8 +127,8 @@
         if (obj instanceof Person) {
             final Person other = (Person) obj;
             return Objects.equals(mName, other.mName)
-                    && mIcon == null ? other.mIcon == null :
-                    (other.mIcon != null && mIcon.sameAs(other.mIcon))
+                    && (mIcon == null ? other.mIcon == null :
+                    (other.mIcon != null && mIcon.sameAs(other.mIcon)))
                     && Objects.equals(mUri, other.mUri)
                     && Objects.equals(mKey, other.mKey)
                     && mIsBot == other.mIsBot
diff --git a/core/java/android/view/textclassifier/ActionsSuggestionsHelper.java b/core/java/android/view/textclassifier/ActionsSuggestionsHelper.java
new file mode 100644
index 0000000..8df83c0
--- /dev/null
+++ b/core/java/android/view/textclassifier/ActionsSuggestionsHelper.java
@@ -0,0 +1,115 @@
+/*
+ * 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;
+        }
+    }
+}
diff --git a/core/java/android/view/textclassifier/ConversationActions.java b/core/java/android/view/textclassifier/ConversationActions.java
index 5fcf227..1a7b911 100644
--- a/core/java/android/view/textclassifier/ConversationActions.java
+++ b/core/java/android/view/textclassifier/ConversationActions.java
@@ -345,6 +345,16 @@
 
     /** Represents a message in the conversation. */
     public static final class Message implements Parcelable {
+        /**
+         * Represents the local user.
+         *
+         * @see Builder#setAuthor(Person)
+         */
+        public static final Person PERSON_USER_LOCAL =
+                new Person.Builder()
+                        .setKey("text-classifier-conversation-actions-local-user")
+                        .build();
+
         @Nullable
         private final Person mAuthor;
         @Nullable
@@ -446,7 +456,11 @@
             @Nullable
             private Bundle mExtras;
 
-            /** Sets the person who composed this message. */
+            /**
+             * Sets the person who composed this message.
+             * <p>
+             * Use {@link #PERSON_USER_LOCAL} to represent the local user.
+             */
             @NonNull
             public Builder setAuthor(@Nullable Person author) {
                 mAuthor = author;
diff --git a/core/java/android/view/textclassifier/TextClassifierImpl.java b/core/java/android/view/textclassifier/TextClassifierImpl.java
index 798a820..66da45d 100644
--- a/core/java/android/view/textclassifier/TextClassifierImpl.java
+++ b/core/java/android/view/textclassifier/TextClassifierImpl.java
@@ -40,7 +40,6 @@
 import android.provider.Browser;
 import android.provider.CalendarContract;
 import android.provider.ContactsContract;
-import android.text.TextUtils;
 
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.util.IndentingPrintWriter;
@@ -269,17 +268,17 @@
             final ZonedDateTime refTime = ZonedDateTime.now();
             final Collection<String> entitiesToIdentify = request.getEntityConfig() != null
                     ? request.getEntityConfig().resolveEntityListModifications(
-                            getEntitiesForHints(request.getEntityConfig().getHints()))
+                    getEntitiesForHints(request.getEntityConfig().getHints()))
                     : mSettings.getEntityListDefault();
             final AnnotatorModel annotatorImpl =
                     getAnnotatorImpl(request.getDefaultLocales());
             final AnnotatorModel.AnnotatedSpan[] annotations =
                     annotatorImpl.annotate(
-                        textString,
-                        new AnnotatorModel.AnnotationOptions(
-                                refTime.toInstant().toEpochMilli(),
-                                        refTime.getZone().getId(),
-                                concatenateLocales(request.getDefaultLocales())));
+                            textString,
+                            new AnnotatorModel.AnnotationOptions(
+                                    refTime.toInstant().toEpochMilli(),
+                                    refTime.getZone().getId(),
+                                    concatenateLocales(request.getDefaultLocales())));
             for (AnnotatorModel.AnnotatedSpan span : annotations) {
                 final AnnotatorModel.ClassificationResult[] results =
                         span.getClassification();
@@ -373,20 +372,13 @@
                 // Actions model is optional, fallback if it is not available.
                 return mFallback.suggestConversationActions(request);
             }
-            List<ActionsSuggestionsModel.ConversationMessage> nativeMessages = new ArrayList<>();
-            for (ConversationActions.Message message : request.getConversation()) {
-                if (TextUtils.isEmpty(message.getText())) {
-                    continue;
-                }
-                // TODO: We need to map the Person object to user id.
-                int userId = 1;
-                nativeMessages.add(
-                        new ActionsSuggestionsModel.ConversationMessage(
-                                userId, message.getText().toString()));
+            ActionsSuggestionsModel.ConversationMessage[] nativeMessages =
+                    ActionsSuggestionsHelper.toNativeMessages(request.getConversation());
+            if (nativeMessages.length == 0) {
+                return mFallback.suggestConversationActions(request);
             }
             ActionsSuggestionsModel.Conversation nativeConversation =
-                    new ActionsSuggestionsModel.Conversation(nativeMessages.toArray(
-                            new ActionsSuggestionsModel.ConversationMessage[0]));
+                    new ActionsSuggestionsModel.Conversation(nativeMessages);
 
             ActionsSuggestionsModel.ActionSuggestion[] nativeSuggestions =
                     actionsImpl.suggestActions(nativeConversation, null);
diff --git a/core/tests/coretests/src/android/view/textclassifier/ActionsSuggestionsHelperTest.java b/core/tests/coretests/src/android/view/textclassifier/ActionsSuggestionsHelperTest.java
new file mode 100644
index 0000000..f0faaf6
--- /dev/null
+++ b/core/tests/coretests/src/android/view/textclassifier/ActionsSuggestionsHelperTest.java
@@ -0,0 +1,157 @@
+/*
+ * 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 static com.google.common.truth.Truth.assertThat;
+
+import android.app.Person;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+
+import com.google.android.textclassifier.ActionsSuggestionsModel;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class ActionsSuggestionsHelperTest {
+    @Test
+    public void testToNativeMessages_emptyInput() {
+        ActionsSuggestionsModel.ConversationMessage[] conversationMessages =
+                ActionsSuggestionsHelper.toNativeMessages(Collections.emptyList());
+
+        assertThat(conversationMessages).isEmpty();
+    }
+
+    @Test
+    public void testToNativeMessages_noTextMessages() {
+        ConversationActions.Message messageWithoutText =
+                new ConversationActions.Message.Builder().build();
+
+        ActionsSuggestionsModel.ConversationMessage[] conversationMessages =
+                ActionsSuggestionsHelper.toNativeMessages(
+                        Collections.singletonList(messageWithoutText));
+
+        assertThat(conversationMessages).isEmpty();
+    }
+
+    @Test
+    public void testToNativeMessages_missingPersonInFirstMessage() {
+        ConversationActions.Message firstMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("first")
+                        .build();
+        ConversationActions.Message secondMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("second")
+                        .setAuthor(new Person.Builder().build())
+                        .build();
+        ConversationActions.Message thirdMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("third")
+                        .setAuthor(ConversationActions.Message.PERSON_USER_LOCAL)
+                        .build();
+
+        ActionsSuggestionsModel.ConversationMessage[] conversationMessages =
+                ActionsSuggestionsHelper.toNativeMessages(
+                        Arrays.asList(firstMessage, secondMessage, thirdMessage));
+
+        assertThat(conversationMessages).hasLength(2);
+        assertNativeMessage(conversationMessages[0], secondMessage.getText(), 1);
+        assertNativeMessage(conversationMessages[1], thirdMessage.getText(), 0);
+    }
+
+    @Test
+    public void testToNativeMessages_missingPersonInMiddleOfConversation() {
+        ConversationActions.Message firstMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("first")
+                        .setAuthor(new Person.Builder().setName("first").build())
+                        .build();
+        ConversationActions.Message secondMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("second")
+                        .build();
+        ConversationActions.Message thirdMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("third")
+                        .setAuthor(new Person.Builder().setName("third").build())
+                        .build();
+        ConversationActions.Message fourthMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("fourth")
+                        .setAuthor(new Person.Builder().setName("fourth").build())
+                        .build();
+
+        ActionsSuggestionsModel.ConversationMessage[] conversationMessages =
+                ActionsSuggestionsHelper.toNativeMessages(
+                        Arrays.asList(firstMessage, secondMessage, thirdMessage, fourthMessage));
+
+        assertThat(conversationMessages).hasLength(2);
+        assertNativeMessage(conversationMessages[0], thirdMessage.getText(), 2);
+        assertNativeMessage(conversationMessages[1], fourthMessage.getText(), 1);
+    }
+
+    @Test
+    public void testToNativeMessages_userIdEncoding() {
+        Person userA = new Person.Builder().setName("userA").build();
+        Person userB = new Person.Builder().setName("userB").build();
+
+        ConversationActions.Message firstMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("first")
+                        .setAuthor(userB)
+                        .build();
+        ConversationActions.Message secondMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("second")
+                        .setAuthor(userA)
+                        .build();
+        ConversationActions.Message thirdMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("third")
+                        .setAuthor(ConversationActions.Message.PERSON_USER_LOCAL)
+                        .build();
+        ConversationActions.Message fourthMessage =
+                new ConversationActions.Message.Builder()
+                        .setText("fourth")
+                        .setAuthor(userA)
+                        .build();
+
+        ActionsSuggestionsModel.ConversationMessage[] conversationMessages =
+                ActionsSuggestionsHelper.toNativeMessages(
+                        Arrays.asList(firstMessage, secondMessage, thirdMessage, fourthMessage));
+
+        assertThat(conversationMessages).hasLength(4);
+        assertNativeMessage(conversationMessages[0], firstMessage.getText(), 2);
+        assertNativeMessage(conversationMessages[1], secondMessage.getText(), 1);
+        assertNativeMessage(conversationMessages[2], thirdMessage.getText(), 0);
+        assertNativeMessage(conversationMessages[3], fourthMessage.getText(), 1);
+    }
+
+    private static void assertNativeMessage(
+            ActionsSuggestionsModel.ConversationMessage nativeMessage,
+            CharSequence text,
+            int userId) {
+        assertThat(nativeMessage.getText()).isEqualTo(text.toString());
+        assertThat(nativeMessage.getUserId()).isEqualTo(userId);
+    }
+}