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/*
* Copyright (C) 2014 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 com.android.printspooler.ui;
import android.app.Activity;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.Loader;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.print.PrinterId;
import android.print.PrinterInfo;
import com.android.internal.os.SomeArgs;
import java.util.ArrayList;
import java.util.List;
public class PrinterRegistry {
private static final int LOADER_ID_PRINTERS_LOADER = 1;
private final Activity mActivity;
private final List<PrinterInfo> mPrinters = new ArrayList<>();
private final Runnable mReadyCallback;
private final Handler mHandler;
private boolean mReady;
private OnPrintersChangeListener mOnPrintersChangeListener;
public interface OnPrintersChangeListener {
public void onPrintersChanged(List<PrinterInfo> printers);
public void onPrintersInvalid();
}
public PrinterRegistry(Activity activity, Runnable readyCallback) {
mActivity = activity;
mReadyCallback = readyCallback;
mHandler = new MyHandler(activity.getMainLooper());
activity.getLoaderManager().initLoader(LOADER_ID_PRINTERS_LOADER,
null, mLoaderCallbacks);
}
public void setOnPrintersChangeListener(OnPrintersChangeListener listener) {
mOnPrintersChangeListener = listener;
}
public List<PrinterInfo> getPrinters() {
return mPrinters;
}
public void addHistoricalPrinter(PrinterInfo printer) {
FusedPrintersProvider provider = getPrinterProvider();
if (provider != null) {
getPrinterProvider().addHistoricalPrinter(printer);
}
}
public void forgetFavoritePrinter(PrinterId printerId) {
FusedPrintersProvider provider = getPrinterProvider();
if (provider != null) {
provider.forgetFavoritePrinter(printerId);
}
}
public boolean isFavoritePrinter(PrinterId printerId) {
FusedPrintersProvider provider = getPrinterProvider();
if (provider != null) {
return provider.isFavoritePrinter(printerId);
}
return false;
}
public void setTrackedPrinter(PrinterId printerId) {
FusedPrintersProvider provider = getPrinterProvider();
if (provider != null) {
provider.setTrackedPrinter(printerId);
}
}
public boolean areHistoricalPrintersLoaded() {
FusedPrintersProvider provider = getPrinterProvider();
if (provider != null) {
return getPrinterProvider().areHistoricalPrintersLoaded();
}
return false;
}
private FusedPrintersProvider getPrinterProvider() {
Loader<?> loader = mActivity.getLoaderManager().getLoader(LOADER_ID_PRINTERS_LOADER);
return (FusedPrintersProvider) loader;
}
private final LoaderCallbacks<List<PrinterInfo>> mLoaderCallbacks =
new LoaderCallbacks<List<PrinterInfo>>() {
@Override
public void onLoaderReset(Loader<List<PrinterInfo>> loader) {
if (loader.getId() == LOADER_ID_PRINTERS_LOADER) {
mPrinters.clear();
if (mOnPrintersChangeListener != null) {
// Post a message as we are in onLoadFinished and certain operations
// are not allowed in this callback, such as fragment transactions.
// Clients should not handle this explicitly.
mHandler.obtainMessage(MyHandler.MSG_PRINTERS_INVALID,
mOnPrintersChangeListener).sendToTarget();
}
}
}
// LoaderCallbacks#onLoadFinished
@Override
public void onLoadFinished(Loader<List<PrinterInfo>> loader, List<PrinterInfo> printers) {
if (loader.getId() == LOADER_ID_PRINTERS_LOADER) {
mPrinters.clear();
mPrinters.addAll(printers);
if (mOnPrintersChangeListener != null) {
// Post a message as we are in onLoadFinished and certain operations
// are not allowed in this callback, such as fragment transactions.
// Clients should not handle this explicitly.
SomeArgs args = SomeArgs.obtain();
args.arg1 = mOnPrintersChangeListener;
args.arg2 = printers;
mHandler.obtainMessage(MyHandler.MSG_PRINTERS_CHANGED, args).sendToTarget();
}
if (!mReady) {
mReady = true;
if (mReadyCallback != null) {
mReadyCallback.run();
}
}
}
}
// LoaderCallbacks#onCreateLoader
@Override
public Loader<List<PrinterInfo>> onCreateLoader(int id, Bundle args) {
if (id == LOADER_ID_PRINTERS_LOADER) {
return new FusedPrintersProvider(mActivity);
}
return null;
}
};
private static final class MyHandler extends Handler {
public static final int MSG_PRINTERS_CHANGED = 0;
public static final int MSG_PRINTERS_INVALID = 1;
public MyHandler(Looper looper) {
super(looper, null , false);
}
@Override
@SuppressWarnings("unchecked")
public void handleMessage(Message message) {
switch (message.what) {
case MSG_PRINTERS_CHANGED: {
SomeArgs args = (SomeArgs) message.obj;
OnPrintersChangeListener callback = (OnPrintersChangeListener) args.arg1;
List<PrinterInfo> printers = (List<PrinterInfo>) args.arg2;
args.recycle();
callback.onPrintersChanged(printers);
} break;
case MSG_PRINTERS_INVALID: {
OnPrintersChangeListener callback = (OnPrintersChangeListener) message.obj;
callback.onPrintersInvalid();
} break;
}
}
}
}
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