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/*
* Copyright (C) 2017 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.voicemail.impl.scheduling;
import android.content.Context;
import android.content.Intent;
import android.os.BadParcelableException;
import android.os.Bundle;
import android.support.annotation.NonNull;
import com.android.voicemail.impl.VvmLog;
/** Common operations on {@link Task} */
final class Tasks {
private Tasks() {}
static final String EXTRA_CLASS_NAME = "extra_class_name";
/** The task cannot be created. */
static final class TaskCreationException extends Exception {
TaskCreationException(Throwable throwable) {
super(throwable);
}
}
/**
* Create a task from a bundle. The bundle is created either with {@link #toBundle(Task)} or
* {@link #createIntent(Context, Class)} from the target {@link Task}
*/
@NonNull
public static Task createTask(Context context, Bundle extras) throws TaskCreationException {
// The extra contains custom parcelables which cannot be unmarshalled by the framework class
// loader.
extras.setClassLoader(context.getClassLoader());
String className;
try {
className = extras.getString(EXTRA_CLASS_NAME);
} catch (BadParcelableException e) {
// BadParcelableException:Parcelable protocol requires that the class implements Parcelable
// This happens when the task is submitted before an update, and can no longer be unparceled.
throw new TaskCreationException(e);
}
VvmLog.i("Task.createTask", "create task:" + className);
if (className == null) {
throw new IllegalArgumentException("EXTRA_CLASS_NAME expected");
}
try {
Task task = (Task) Class.forName(className).getDeclaredConstructor().newInstance();
task.onCreate(context, extras);
return task;
} catch (ReflectiveOperationException e) {
throw new IllegalArgumentException(e);
}
}
/**
* Serializes necessary states to a bundle that can be used to restore the task with {@link
* #createTask(Context, Bundle)}
*/
public static Bundle toBundle(Task task) {
Bundle result = task.toBundle();
result.putString(EXTRA_CLASS_NAME, task.getClass().getName());
return result;
}
/**
* Create an intent that when called with {@link Context#startService(Intent)}, will queue the
* <code>task</code>. Implementations of {@link Task} should use the result of this and fill in
* necessary information.
*/
public static Intent createIntent(Context context, Class<? extends Task> task) {
Intent intent = new Intent(context, TaskReceiver.class);
intent.setPackage(context.getPackageName());
intent.putExtra(EXTRA_CLASS_NAME, task.getName());
return intent;
}
}
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