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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 android.view.textclassifier;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.WorkerThread;
import android.content.Context;
import android.os.Looper;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.service.textclassifier.ITextClassificationCallback;
import android.service.textclassifier.ITextClassifierService;
import android.service.textclassifier.ITextLinksCallback;
import android.service.textclassifier.ITextSelectionCallback;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.annotations.VisibleForTesting.Visibility;
import com.android.internal.util.Preconditions;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* Proxy to the system's default TextClassifier.
* @hide
*/
@VisibleForTesting(visibility = Visibility.PACKAGE)
public final class SystemTextClassifier implements TextClassifier {
private static final String LOG_TAG = "SystemTextClassifier";
private final ITextClassifierService mManagerService;
private final TextClassificationConstants mSettings;
private final TextClassifier mFallback;
private final String mPackageName;
private TextClassificationSessionId mSessionId;
public SystemTextClassifier(Context context, TextClassificationConstants settings)
throws ServiceManager.ServiceNotFoundException {
mManagerService = ITextClassifierService.Stub.asInterface(
ServiceManager.getServiceOrThrow(Context.TEXT_CLASSIFICATION_SERVICE));
mSettings = Preconditions.checkNotNull(settings);
mFallback = new TextClassifierImpl(context, settings);
mPackageName = Preconditions.checkNotNull(context.getPackageName());
}
/**
* @inheritDoc
*/
@Override
@WorkerThread
public TextSelection suggestSelection(TextSelection.Request request) {
Preconditions.checkNotNull(request);
Utils.checkMainThread();
try {
final TextSelectionCallback callback = new TextSelectionCallback();
mManagerService.onSuggestSelection(mSessionId, request, callback);
final TextSelection selection = callback.mReceiver.get();
if (selection != null) {
return selection;
}
} catch (RemoteException | InterruptedException e) {
Log.e(LOG_TAG, "Error suggesting selection for text. Using fallback.", e);
}
return mFallback.suggestSelection(request);
}
/**
* @inheritDoc
*/
@Override
@WorkerThread
public TextClassification classifyText(TextClassification.Request request) {
Preconditions.checkNotNull(request);
Utils.checkMainThread();
try {
final TextClassificationCallback callback = new TextClassificationCallback();
mManagerService.onClassifyText(mSessionId, request, callback);
final TextClassification classification = callback.mReceiver.get();
if (classification != null) {
return classification;
}
} catch (RemoteException | InterruptedException e) {
Log.e(LOG_TAG, "Error classifying text. Using fallback.", e);
}
return mFallback.classifyText(request);
}
/**
* @inheritDoc
*/
@Override
@WorkerThread
public TextLinks generateLinks(@NonNull TextLinks.Request request) {
Preconditions.checkNotNull(request);
Utils.checkMainThread();
if (!mSettings.isSmartLinkifyEnabled() && request.isLegacyFallback()) {
return Utils.generateLegacyLinks(request);
}
try {
request.setCallingPackageName(mPackageName);
final TextLinksCallback callback = new TextLinksCallback();
mManagerService.onGenerateLinks(mSessionId, request, callback);
final TextLinks links = callback.mReceiver.get();
if (links != null) {
return links;
}
} catch (RemoteException | InterruptedException e) {
Log.e(LOG_TAG, "Error generating links. Using fallback.", e);
}
return mFallback.generateLinks(request);
}
/**
* @inheritDoc
*/
@Override
@WorkerThread
public int getMaxGenerateLinksTextLength() {
// TODO: retrieve this from the bound service.
return mFallback.getMaxGenerateLinksTextLength();
}
@Override
public void destroy() {
try {
if (mSessionId != null) {
mManagerService.onDestroyTextClassificationSession(mSessionId);
}
} catch (RemoteException e) {
Log.e(LOG_TAG, "Error destroying classification session.", e);
}
}
/**
* Attempts to initialize a new classification session.
*
* @param classificationContext the classification context
* @param sessionId the session's id
*/
void initializeRemoteSession(
@NonNull TextClassificationContext classificationContext,
@NonNull TextClassificationSessionId sessionId) {
mSessionId = Preconditions.checkNotNull(sessionId);
try {
mManagerService.onCreateTextClassificationSession(classificationContext, mSessionId);
} catch (RemoteException e) {
Log.e(LOG_TAG, "Error starting a new classification session.", e);
}
}
private static final class TextSelectionCallback extends ITextSelectionCallback.Stub {
final ResponseReceiver<TextSelection> mReceiver = new ResponseReceiver<>();
@Override
public void onSuccess(TextSelection selection) {
mReceiver.onSuccess(selection);
}
@Override
public void onFailure() {
mReceiver.onFailure();
}
}
private static final class TextClassificationCallback extends ITextClassificationCallback.Stub {
final ResponseReceiver<TextClassification> mReceiver = new ResponseReceiver<>();
@Override
public void onSuccess(TextClassification classification) {
mReceiver.onSuccess(classification);
}
@Override
public void onFailure() {
mReceiver.onFailure();
}
}
private static final class TextLinksCallback extends ITextLinksCallback.Stub {
final ResponseReceiver<TextLinks> mReceiver = new ResponseReceiver<>();
@Override
public void onSuccess(TextLinks links) {
mReceiver.onSuccess(links);
}
@Override
public void onFailure() {
mReceiver.onFailure();
}
}
private static final class ResponseReceiver<T> {
private final CountDownLatch mLatch = new CountDownLatch(1);
private T mResponse;
public void onSuccess(T response) {
mResponse = response;
mLatch.countDown();
}
public void onFailure() {
Log.e(LOG_TAG, "Request failed.", null);
mLatch.countDown();
}
@Nullable
public T get() throws InterruptedException {
// If this is running on the main thread, do not block for a response.
// The response will unfortunately be null and the TextClassifier should depend on its
// fallback.
// NOTE that TextClassifier calls should preferably always be called on a worker thread.
if (Looper.myLooper() != Looper.getMainLooper()) {
mLatch.await(2, TimeUnit.SECONDS);
}
return mResponse;
}
}
}
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