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/*
* Copyright (C) 2016 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.print;
import android.annotation.NonNull;
import android.content.Context;
import android.content.Loader;
import android.os.Handler;
import android.os.Message;
import android.printservice.recommendation.RecommendationInfo;
import com.android.internal.util.Preconditions;
import java.util.List;
/**
* Loader for the list of print service recommendations.
*
* @hide
*/
public class PrintServiceRecommendationsLoader extends Loader<List<RecommendationInfo>> {
/** The print manager to be used by this object */
private final @NonNull PrintManager mPrintManager;
/** Handler to sequentialize the delivery of the results to the main thread */
private final @NonNull Handler mHandler;
/** Listens for updates to the data from the platform */
private PrintManager.PrintServiceRecommendationsChangeListener mListener;
/**
* Create a new PrintServicesLoader.
*
* @param printManager The print manager supplying the data
* @param context Context of the using object
*/
public PrintServiceRecommendationsLoader(@NonNull PrintManager printManager,
@NonNull Context context) {
super(Preconditions.checkNotNull(context));
mHandler = new MyHandler();
mPrintManager = Preconditions.checkNotNull(printManager);
}
@Override
protected void onForceLoad() {
queueNewResult();
}
/**
* Read the print service recommendations and queue it to be delivered on the main thread.
*/
private void queueNewResult() {
Message m = mHandler.obtainMessage(0);
m.obj = mPrintManager.getPrintServiceRecommendations();
mHandler.sendMessage(m);
}
@Override
protected void onStartLoading() {
mListener = new PrintManager.PrintServiceRecommendationsChangeListener() {
@Override
public void onPrintServiceRecommendationsChanged() {
queueNewResult();
}
};
mPrintManager.addPrintServiceRecommendationsChangeListener(mListener, null);
// Immediately deliver a result
deliverResult(mPrintManager.getPrintServiceRecommendations());
}
@Override
protected void onStopLoading() {
if (mListener != null) {
mPrintManager.removePrintServiceRecommendationsChangeListener(mListener);
mListener = null;
}
mHandler.removeMessages(0);
}
@Override
protected void onReset() {
onStopLoading();
}
/**
* Handler to sequentialize all the updates to the main thread.
*/
private class MyHandler extends Handler {
/**
* Create a new handler on the main thread.
*/
public MyHandler() {
super(getContext().getMainLooper());
}
@Override
public void handleMessage(Message msg) {
if (isStarted()) {
deliverResult((List<RecommendationInfo>) msg.obj);
}
}
}
}
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