92 lines
3.2 KiB
Java
92 lines
3.2 KiB
Java
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.voicemail.impl.scheduling;
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import android.content.Context;
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import android.content.Intent;
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import android.os.BadParcelableException;
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import android.os.Bundle;
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import android.support.annotation.NonNull;
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import com.android.voicemail.impl.VvmLog;
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/** Common operations on {@link Task} */
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final class Tasks {
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private Tasks() {}
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static final String EXTRA_CLASS_NAME = "extra_class_name";
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/** The task cannot be created. */
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static final class TaskCreationException extends Exception {
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TaskCreationException(Throwable throwable) {
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super(throwable);
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}
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}
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/**
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* Create a task from a bundle. The bundle is created either with {@link #toBundle(Task)} or
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* {@link #createIntent(Context, Class)} from the target {@link Task}
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*/
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@NonNull
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public static Task createTask(Context context, Bundle extras) throws TaskCreationException {
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// The extra contains custom parcelables which cannot be unmarshalled by the framework class
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// loader.
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extras.setClassLoader(context.getClassLoader());
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String className;
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try {
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className = extras.getString(EXTRA_CLASS_NAME);
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} catch (BadParcelableException e) {
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// BadParcelableException:Parcelable protocol requires that the class implements Parcelable
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// This happens when the task is submitted before an update, and can no longer be unparceled.
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throw new TaskCreationException(e);
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}
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VvmLog.i("Task.createTask", "create task:" + className);
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if (className == null) {
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throw new IllegalArgumentException("EXTRA_CLASS_NAME expected");
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}
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try {
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Task task = (Task) Class.forName(className).getDeclaredConstructor().newInstance();
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task.onCreate(context, extras);
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return task;
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} catch (ReflectiveOperationException e) {
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throw new IllegalArgumentException(e);
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}
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}
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/**
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* Serializes necessary states to a bundle that can be used to restore the task with {@link
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* #createTask(Context, Bundle)}
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*/
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public static Bundle toBundle(Task task) {
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Bundle result = task.toBundle();
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result.putString(EXTRA_CLASS_NAME, task.getClass().getName());
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return result;
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}
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/**
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* Create an intent that when called with {@link Context#startService(Intent)}, will queue the
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* <code>task</code>. Implementations of {@link Task} should use the result of this and fill in
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* necessary information.
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*/
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public static Intent createIntent(Context context, Class<? extends Task> task) {
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Intent intent = new Intent(context, TaskReceiver.class);
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intent.setPackage(context.getPackageName());
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intent.putExtra(EXTRA_CLASS_NAME, task.getName());
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return intent;
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}
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}
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