Fix indentation for Java sources.

1 files changed, 544 insertions, 544 deletions

diff --git a/platform/android/viewer/src/com/artifex/mupdfdemo/AsyncTask.java b/platform/android/viewer/src/com/artifex/mupdfdemo/AsyncTask.java
index b370794c..f2dcf70a 100644
--- a/platform/android/viewer/src/com/artifex/mupdfdemo/AsyncTask.java
+++ b/platform/android/viewer/src/com/artifex/mupdfdemo/AsyncTask.java
@@ -5,7 +5,7 @@
  * 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
+ *	  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,
@@ -67,25 +67,25 @@ import android.os.Message;
  * <p>Here is an example of subclassing:</p>
  * <pre class="prettyprint">
  * private class DownloadFilesTask extends AsyncTask&lt;URL, Integer, Long&gt; {
- *     protected Long doInBackground(URL... urls) {
- *         int count = urls.length;
- *         long totalSize = 0;
- *         for (int i = 0; i < count; i++) {
- *             totalSize += Downloader.downloadFile(urls[i]);
- *             publishProgress((int) ((i / (float) count) * 100));
- *             // Escape early if cancel() is called
- *             if (isCancelled()) break;
- *         }
- *         return totalSize;
- *     }
+ *	 protected Long doInBackground(URL... urls) {
+ *		 int count = urls.length;
+ *		 long totalSize = 0;
+ *		 for (int i = 0; i < count; i++) {
+ *			 totalSize += Downloader.downloadFile(urls[i]);
+ *			 publishProgress((int) ((i / (float) count) * 100));
+ *			 // Escape early if cancel() is called
+ *			 if (isCancelled()) break;
+ *		 }
+ *		 return totalSize;
+ *	 }
  *
- *     protected void onProgressUpdate(Integer... progress) {
- *         setProgressPercent(progress[0]);
- *     }
+ *	 protected void onProgressUpdate(Integer... progress) {
+ *		 setProgressPercent(progress[0]);
+ *	 }
  *
- *     protected void onPostExecute(Long result) {
- *         showDialog("Downloaded " + result + " bytes");
- *     }
+ *	 protected void onPostExecute(Long result) {
+ *		 showDialog("Downloaded " + result + " bytes");
+ *	 }
  * }
  * </pre>
  *
@@ -97,12 +97,12 @@ import android.os.Message;
  * <h2>AsyncTask's generic types</h2>
  * <p>The three types used by an asynchronous task are the following:</p>
  * <ol>
- *     <li><code>Params</code>, the type of the parameters sent to the task upon
- *     execution.</li>
- *     <li><code>Progress</code>, the type of the progress units published during
- *     the background computation.</li>
- *     <li><code>Result</code>, the type of the result of the background
- *     computation.</li>
+ *	 <li><code>Params</code>, the type of the parameters sent to the task upon
+ *	 execution.</li>
+ *	 <li><code>Progress</code>, the type of the progress units published during
+ *	 the background computation.</li>
+ *	 <li><code>Result</code>, the type of the result of the background
+ *	 computation.</li>
  * </ol>
  * <p>Not all types are always used by an asynchronous task. To mark a type as unused,
  * simply use the type {@link Void}:</p>
@@ -113,25 +113,25 @@ import android.os.Message;
  * <h2>The 4 steps</h2>
  * <p>When an asynchronous task is executed, the task goes through 4 steps:</p>
  * <ol>
- *     <li>{@link #onPreExecute()}, invoked on the UI thread before the task
- *     is executed. This step is normally used to setup the task, for instance by
- *     showing a progress bar in the user interface.</li>
- *     <li>{@link #doInBackground}, invoked on the background thread
- *     immediately after {@link #onPreExecute()} finishes executing. This step is used
- *     to perform background computation that can take a long time. The parameters
- *     of the asynchronous task are passed to this step. The result of the computation must
- *     be returned by this step and will be passed back to the last step. This step
- *     can also use {@link #publishProgress} to publish one or more units
- *     of progress. These values are published on the UI thread, in the
- *     {@link #onProgressUpdate} step.</li>
- *     <li>{@link #onProgressUpdate}, invoked on the UI thread after a
- *     call to {@link #publishProgress}. The timing of the execution is
- *     undefined. This method is used to display any form of progress in the user
- *     interface while the background computation is still executing. For instance,
- *     it can be used to animate a progress bar or show logs in a text field.</li>
- *     <li>{@link #onPostExecute}, invoked on the UI thread after the background
- *     computation finishes. The result of the background computation is passed to
- *     this step as a parameter.</li>
+ *	 <li>{@link #onPreExecute()}, invoked on the UI thread before the task
+ *	 is executed. This step is normally used to setup the task, for instance by
+ *	 showing a progress bar in the user interface.</li>
+ *	 <li>{@link #doInBackground}, invoked on the background thread
+ *	 immediately after {@link #onPreExecute()} finishes executing. This step is used
+ *	 to perform background computation that can take a long time. The parameters
+ *	 of the asynchronous task are passed to this step. The result of the computation must
+ *	 be returned by this step and will be passed back to the last step. This step
+ *	 can also use {@link #publishProgress} to publish one or more units
+ *	 of progress. These values are published on the UI thread, in the
+ *	 {@link #onProgressUpdate} step.</li>
+ *	 <li>{@link #onProgressUpdate}, invoked on the UI thread after a
+ *	 call to {@link #publishProgress}. The timing of the execution is
+ *	 undefined. This method is used to display any form of progress in the user
+ *	 interface while the background computation is still executing. For instance,
+ *	 it can be used to animate a progress bar or show logs in a text field.</li>
+ *	 <li>{@link #onPostExecute}, invoked on the UI thread after the background
+ *	 computation finishes. The result of the background computation is passed to
+ *	 this step as a parameter.</li>
  * </ol>
  *
  * <h2>Cancelling a task</h2>
@@ -147,24 +147,24 @@ import android.os.Message;
  * <p>There are a few threading rules that must be followed for this class to
  * work properly:</p>
  * <ul>
- *     <li>The AsyncTask class must be loaded on the UI thread. This is done
- *     automatically as of {@link android.os.Build.VERSION_CODES#JELLY_BEAN}.</li>
- *     <li>The task instance must be created on the UI thread.</li>
- *     <li>{@link #execute} must be invoked on the UI thread.</li>
- *     <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
- *     {@link #doInBackground}, {@link #onProgressUpdate} manually.</li>
- *     <li>The task can be executed only once (an exception will be thrown if
- *     a second execution is attempted.)</li>
+ *	 <li>The AsyncTask class must be loaded on the UI thread. This is done
+ *	 automatically as of {@link android.os.Build.VERSION_CODES#JELLY_BEAN}.</li>
+ *	 <li>The task instance must be created on the UI thread.</li>
+ *	 <li>{@link #execute} must be invoked on the UI thread.</li>
+ *	 <li>Do not call {@link #onPreExecute()}, {@link #onPostExecute},
+ *	 {@link #doInBackground}, {@link #onProgressUpdate} manually.</li>
+ *	 <li>The task can be executed only once (an exception will be thrown if
+ *	 a second execution is attempted.)</li>
  * </ul>
  *
  * <h2>Memory observability</h2>
  * <p>AsyncTask guarantees that all callback calls are synchronized in such a way that the following
  * operations are safe without explicit synchronizations.</p>
  * <ul>
- *     <li>Set member fields in the constructor or {@link #onPreExecute}, and refer to them
- *     in {@link #doInBackground}.
- *     <li>Set member fields in {@link #doInBackground}, and refer to them in
- *     {@link #onProgressUpdate} and {@link #onPostExecute}.
+ *	 <li>Set member fields in the constructor or {@link #onPreExecute}, and refer to them
+ *	 in {@link #doInBackground}.
+ *	 <li>Set member fields in {@link #doInBackground}, and refer to them in
+ *	 {@link #onProgressUpdate} and {@link #onPostExecute}.
  * </ul>
  *
  * <h2>Order of execution</h2>
@@ -178,493 +178,493 @@ import android.os.Message;
  * {@link #THREAD_POOL_EXECUTOR}.</p>
  */
 public abstract class AsyncTask<Params, Progress, Result> {
-    private static final String LOG_TAG = "AsyncTask";
-
-    private static final int CORE_POOL_SIZE = 5;
-    private static final int MAXIMUM_POOL_SIZE = 128;
-    private static final int KEEP_ALIVE = 1;
-
-    private static final ThreadFactory sThreadFactory = new ThreadFactory() {
-        private final AtomicInteger mCount = new AtomicInteger(1);
-
-        public Thread newThread(Runnable r) {
-            return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
-        }
-    };
-
-    private static final BlockingQueue<Runnable> sPoolWorkQueue =
-            new LinkedBlockingQueue<Runnable>(10);
-
-    /**
-     * An {@link Executor} that can be used to execute tasks in parallel.
-     */
-    public static final Executor THREAD_POOL_EXECUTOR
-            = new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE,
-                    TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory);
-
-    /**
-     * An {@link Executor} that executes tasks one at a time in serial
-     * order.  This serialization is global to a particular process.
-     */
-    public static final Executor SERIAL_EXECUTOR = new SerialExecutor();
-
-    private static final int MESSAGE_POST_RESULT = 0x1;
-    private static final int MESSAGE_POST_PROGRESS = 0x2;
-
-    private static final InternalHandler sHandler = new InternalHandler();
-
-    private static volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;
-    private final WorkerRunnable<Params, Result> mWorker;
-    private final FutureTask<Result> mFuture;
-
-    private volatile Status mStatus = Status.PENDING;
-
-    private final AtomicBoolean mCancelled = new AtomicBoolean();
-    private final AtomicBoolean mTaskInvoked = new AtomicBoolean();
-
-    private static class SerialExecutor implements Executor {
-        final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
-        Runnable mActive;
-
-        public synchronized void execute(final Runnable r) {
-            mTasks.offer(new Runnable() {
-                public void run() {
-                    try {
-                        r.run();
-                    } finally {
-                        scheduleNext();
-                    }
-                }
-            });
-            if (mActive == null) {
-                scheduleNext();
-            }
-        }
-
-        protected synchronized void scheduleNext() {
-            if ((mActive = mTasks.poll()) != null) {
-                THREAD_POOL_EXECUTOR.execute(mActive);
-            }
-        }
-    }
-
-    /**
-     * Indicates the current status of the task. Each status will be set only once
-     * during the lifetime of a task.
-     */
-    public enum Status {
-        /**
-         * Indicates that the task has not been executed yet.
-         */
-        PENDING,
-        /**
-         * Indicates that the task is running.
-         */
-        RUNNING,
-        /**
-         * Indicates that {@link AsyncTask#onPostExecute} has finished.
-         */
-        FINISHED,
-    }
-
-    /** @hide Used to force static handler to be created. */
-    public static void init() {
-        sHandler.getLooper();
-    }
-
-    /** @hide */
-    public static void setDefaultExecutor(Executor exec) {
-        sDefaultExecutor = exec;
-    }
-
-    /**
-     * Creates a new asynchronous task. This constructor must be invoked on the UI thread.
-     */
-    public AsyncTask() {
-        mWorker = new WorkerRunnable<Params, Result>() {
-            public Result call() throws Exception {
-                mTaskInvoked.set(true);
-
-                Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
-                //noinspection unchecked
-                return postResult(doInBackground(mParams));
-            }
-        };
-
-        mFuture = new FutureTask<Result>(mWorker) {
-            @Override
-            protected void done() {
-                try {
-                    postResultIfNotInvoked(get());
-                } catch (InterruptedException e) {
-                    android.util.Log.w(LOG_TAG, e);
-                } catch (ExecutionException e) {
-                    throw new RuntimeException("An error occured while executing doInBackground()",
-                            e.getCause());
-                } catch (CancellationException e) {
-                    postResultIfNotInvoked(null);
-                }
-            }
-        };
-    }
-
-    private void postResultIfNotInvoked(Result result) {
-        final boolean wasTaskInvoked = mTaskInvoked.get();
-        if (!wasTaskInvoked) {
-            postResult(result);
-        }
-    }
-
-    private Result postResult(Result result) {
-        @SuppressWarnings("unchecked")
-        Message message = sHandler.obtainMessage(MESSAGE_POST_RESULT,
-                new AsyncTaskResult<Result>(this, result));
-        message.sendToTarget();
-        return result;
-    }
-
-    /**
-     * Returns the current status of this task.
-     *
-     * @return The current status.
-     */
-    public final Status getStatus() {
-        return mStatus;
-    }
-
-    /**
-     * Override this method to perform a computation on a background thread. The
-     * specified parameters are the parameters passed to {@link #execute}
-     * by the caller of this task.
-     *
-     * This method can call {@link #publishProgress} to publish updates
-     * on the UI thread.
-     *
-     * @param params The parameters of the task.
-     *
-     * @return A result, defined by the subclass of this task.
-     *
-     * @see #onPreExecute()
-     * @see #onPostExecute
-     * @see #publishProgress
-     */
-    protected abstract Result doInBackground(Params... params);
-
-    /**
-     * Runs on the UI thread before {@link #doInBackground}.
-     *
-     * @see #onPostExecute
-     * @see #doInBackground
-     */
-    protected void onPreExecute() {
-    }
-
-    /**
-     * <p>Runs on the UI thread after {@link #doInBackground}. The
-     * specified result is the value returned by {@link #doInBackground}.</p>
-     *
-     * <p>This method won't be invoked if the task was cancelled.</p>
-     *
-     * @param result The result of the operation computed by {@link #doInBackground}.
-     *
-     * @see #onPreExecute
-     * @see #doInBackground
-     * @see #onCancelled(Object)
-     */
-    @SuppressWarnings({"UnusedDeclaration"})
-    protected void onPostExecute(Result result) {
-    }
-
-    /**
-     * Runs on the UI thread after {@link #publishProgress} is invoked.
-     * The specified values are the values passed to {@link #publishProgress}.
-     *
-     * @param values The values indicating progress.
-     *
-     * @see #publishProgress
-     * @see #doInBackground
-     */
-    @SuppressWarnings({"UnusedDeclaration"})
-    protected void onProgressUpdate(Progress... values) {
-    }
-
-    /**
-     * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
-     * {@link #doInBackground(Object[])} has finished.</p>
-     *
-     * <p>The default implementation simply invokes {@link #onCancelled()} and
-     * ignores the result. If you write your own implementation, do not call
-     * <code>super.onCancelled(result)</code>.</p>
-     *
-     * @param result The result, if any, computed in
-     *               {@link #doInBackground(Object[])}, can be null
-     *
-     * @see #cancel(boolean)
-     * @see #isCancelled()
-     */
-    @SuppressWarnings({"UnusedParameters"})
-    protected void onCancelled(Result result) {
-        onCancelled();
-    }
-
-    /**
-     * <p>Applications should preferably override {@link #onCancelled(Object)}.
-     * This method is invoked by the default implementation of
-     * {@link #onCancelled(Object)}.</p>
-     *
-     * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
-     * {@link #doInBackground(Object[])} has finished.</p>
-     *
-     * @see #onCancelled(Object)
-     * @see #cancel(boolean)
-     * @see #isCancelled()
-     */
-    protected void onCancelled() {
-    }
-
-    /**
-     * Returns <tt>true</tt> if this task was cancelled before it completed
-     * normally. If you are calling {@link #cancel(boolean)} on the task,
-     * the value returned by this method should be checked periodically from
-     * {@link #doInBackground(Object[])} to end the task as soon as possible.
-     *
-     * @return <tt>true</tt> if task was cancelled before it completed
-     *
-     * @see #cancel(boolean)
-     */
-    public final boolean isCancelled() {
-        return mCancelled.get();
-    }
-
-    /**
-     * <p>Attempts to cancel execution of this task.  This attempt will
-     * fail if the task has already completed, already been cancelled,
-     * or could not be cancelled for some other reason. If successful,
-     * and this task has not started when <tt>cancel</tt> is called,
-     * this task should never run. If the task has already started,
-     * then the <tt>mayInterruptIfRunning</tt> parameter determines
-     * whether the thread executing this task should be interrupted in
-     * an attempt to stop the task.</p>
-     *
-     * <p>Calling this method will result in {@link #onCancelled(Object)} being
-     * invoked on the UI thread after {@link #doInBackground(Object[])}
-     * returns. Calling this method guarantees that {@link #onPostExecute(Object)}
-     * is never invoked. After invoking this method, you should check the
-     * value returned by {@link #isCancelled()} periodically from
-     * {@link #doInBackground(Object[])} to finish the task as early as
-     * possible.</p>
-     *
-     * @param mayInterruptIfRunning <tt>true</tt> if the thread executing this
-     *        task should be interrupted; otherwise, in-progress tasks are allowed
-     *        to complete.
-     *
-     * @return <tt>false</tt> if the task could not be cancelled,
-     *         typically because it has already completed normally;
-     *         <tt>true</tt> otherwise
-     *
-     * @see #isCancelled()
-     * @see #onCancelled(Object)
-     */
-    public final boolean cancel(boolean mayInterruptIfRunning) {
-        mCancelled.set(true);
-        return mFuture.cancel(mayInterruptIfRunning);
-    }
-
-    /**
-     * Waits if necessary for the computation to complete, and then
-     * retrieves its result.
-     *
-     * @return The computed result.
-     *
-     * @throws CancellationException If the computation was cancelled.
-     * @throws ExecutionException If the computation threw an exception.
-     * @throws InterruptedException If the current thread was interrupted
-     *         while waiting.
-     */
-    public final Result get() throws InterruptedException, ExecutionException {
-        return mFuture.get();
-    }
-
-    /**
-     * Waits if necessary for at most the given time for the computation
-     * to complete, and then retrieves its result.
-     *
-     * @param timeout Time to wait before cancelling the operation.
-     * @param unit The time unit for the timeout.
-     *
-     * @return The computed result.
-     *
-     * @throws CancellationException If the computation was cancelled.
-     * @throws ExecutionException If the computation threw an exception.
-     * @throws InterruptedException If the current thread was interrupted
-     *         while waiting.
-     * @throws TimeoutException If the wait timed out.
-     */
-    public final Result get(long timeout, TimeUnit unit) throws InterruptedException,
-            ExecutionException, TimeoutException {
-        return mFuture.get(timeout, unit);
-    }
-
-    /**
-     * Executes the task with the specified parameters. The task returns
-     * itself (this) so that the caller can keep a reference to it.
-     *
-     * <p>Note: this function schedules the task on a queue for a single background
-     * thread or pool of threads depending on the platform version.  When first
-     * introduced, AsyncTasks were executed serially on a single background thread.
-     * Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed
-     * to a pool of threads allowing multiple tasks to operate in parallel. Starting
-     * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are back to being
-     * executed on a single thread to avoid common application errors caused
-     * by parallel execution.  If you truly want parallel execution, you can use
-     * the {@link #executeOnExecutor} version of this method
-     * with {@link #THREAD_POOL_EXECUTOR}; however, see commentary there for warnings
-     * on its use.
-     *
-     * <p>This method must be invoked on the UI thread.
-     *
-     * @param params The parameters of the task.
-     *
-     * @return This instance of AsyncTask.
-     *
-     * @throws IllegalStateException If {@link #getStatus()} returns either
-     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
-     *
-     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
-     * @see #execute(Runnable)
-     */
-    public final AsyncTask<Params, Progress, Result> execute(Params... params) {
-        return executeOnExecutor(sDefaultExecutor, params);
-    }
-
-    /**
-     * Executes the task with the specified parameters. The task returns
-     * itself (this) so that the caller can keep a reference to it.
-     *
-     * <p>This method is typically used with {@link #THREAD_POOL_EXECUTOR} to
-     * allow multiple tasks to run in parallel on a pool of threads managed by
-     * AsyncTask, however you can also use your own {@link Executor} for custom
-     * behavior.
-     *
-     * <p><em>Warning:</em> Allowing multiple tasks to run in parallel from
-     * a thread pool is generally <em>not</em> what one wants, because the order
-     * of their operation is not defined.  For example, if these tasks are used
-     * to modify any state in common (such as writing a file due to a button click),
-     * there are no guarantees on the order of the modifications.
-     * Without careful work it is possible in rare cases for the newer version
-     * of the data to be over-written by an older one, leading to obscure data
-     * loss and stability issues.  Such changes are best
-     * executed in serial; to guarantee such work is serialized regardless of
-     * platform version you can use this function with {@link #SERIAL_EXECUTOR}.
-     *
-     * <p>This method must be invoked on the UI thread.
-     *
-     * @param exec The executor to use.  {@link #THREAD_POOL_EXECUTOR} is available as a
-     *              convenient process-wide thread pool for tasks that are loosely coupled.
-     * @param params The parameters of the task.
-     *
-     * @return This instance of AsyncTask.
-     *
-     * @throws IllegalStateException If {@link #getStatus()} returns either
-     *         {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
-     *
-     * @see #execute(Object[])
-     */
-    public final AsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec,
-            Params... params) {
-        if (mStatus != Status.PENDING) {
-            switch (mStatus) {
-                case RUNNING:
-                    throw new IllegalStateException("Cannot execute task:"
-                            + " the task is already running.");
-                case FINISHED:
-                    throw new IllegalStateException("Cannot execute task:"
-                            + " the task has already been executed "
-                            + "(a task can be executed only once)");
-            }
-        }
-
-        mStatus = Status.RUNNING;
-
-        onPreExecute();
-
-        mWorker.mParams = params;
-        exec.execute(mFuture);
-
-        return this;
-    }
-
-    /**
-     * Convenience version of {@link #execute(Object...)} for use with
-     * a simple Runnable object. See {@link #execute(Object[])} for more
-     * information on the order of execution.
-     *
-     * @see #execute(Object[])
-     * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
-     */
-    public static void execute(Runnable runnable) {
-        sDefaultExecutor.execute(runnable);
-    }
-
-    /**
-     * This method can be invoked from {@link #doInBackground} to
-     * publish updates on the UI thread while the background computation is
-     * still running. Each call to this method will trigger the execution of
-     * {@link #onProgressUpdate} on the UI thread.
-     *
-     * {@link #onProgressUpdate} will note be called if the task has been
-     * canceled.
-     *
-     * @param values The progress values to update the UI with.
-     *
-     * @see #onProgressUpdate
-     * @see #doInBackground
-     */
-    protected final void publishProgress(Progress... values) {
-        if (!isCancelled()) {
-            sHandler.obtainMessage(MESSAGE_POST_PROGRESS,
-                    new AsyncTaskResult<Progress>(this, values)).sendToTarget();
-        }
-    }
-
-    private void finish(Result result) {
-        if (isCancelled()) {
-            onCancelled(result);
-        } else {
-            onPostExecute(result);
-        }
-        mStatus = Status.FINISHED;
-    }
-
-    private static class InternalHandler extends Handler {
-        @SuppressWarnings({"unchecked", "RawUseOfParameterizedType"})
-        @Override
-        public void handleMessage(Message msg) {
-            AsyncTaskResult result = (AsyncTaskResult) msg.obj;
-            switch (msg.what) {
-                case MESSAGE_POST_RESULT:
-                    // There is only one result
-                    result.mTask.finish(result.mData[0]);
-                    break;
-                case MESSAGE_POST_PROGRESS:
-                    result.mTask.onProgressUpdate(result.mData);
-                    break;
-            }
-        }
-    }
-
-    private static abstract class WorkerRunnable<Params, Result> implements Callable<Result> {
-        Params[] mParams;
-    }
-
-    @SuppressWarnings({"RawUseOfParameterizedType"})
-    private static class AsyncTaskResult<Data> {
-        final AsyncTask mTask;
-        final Data[] mData;
-
-        AsyncTaskResult(AsyncTask task, Data... data) {
-            mTask = task;
-            mData = data;
-        }
-    }
+	private static final String LOG_TAG = "AsyncTask";
+
+	private static final int CORE_POOL_SIZE = 5;
+	private static final int MAXIMUM_POOL_SIZE = 128;
+	private static final int KEEP_ALIVE = 1;
+
+	private static final ThreadFactory sThreadFactory = new ThreadFactory() {
+		private final AtomicInteger mCount = new AtomicInteger(1);
+
+		public Thread newThread(Runnable r) {
+			return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());
+		}
+	};
+
+	private static final BlockingQueue<Runnable> sPoolWorkQueue =
+			new LinkedBlockingQueue<Runnable>(10);
+
+	/**
+	 * An {@link Executor} that can be used to execute tasks in parallel.
+	 */
+	public static final Executor THREAD_POOL_EXECUTOR
+			= new ThreadPoolExecutor(CORE_POOL_SIZE, MAXIMUM_POOL_SIZE, KEEP_ALIVE,
+					TimeUnit.SECONDS, sPoolWorkQueue, sThreadFactory);
+
+	/**
+	 * An {@link Executor} that executes tasks one at a time in serial
+	 * order.  This serialization is global to a particular process.
+	 */
+	public static final Executor SERIAL_EXECUTOR = new SerialExecutor();
+
+	private static final int MESSAGE_POST_RESULT = 0x1;
+	private static final int MESSAGE_POST_PROGRESS = 0x2;
+
+	private static final InternalHandler sHandler = new InternalHandler();
+
+	private static volatile Executor sDefaultExecutor = SERIAL_EXECUTOR;
+	private final WorkerRunnable<Params, Result> mWorker;
+	private final FutureTask<Result> mFuture;
+
+	private volatile Status mStatus = Status.PENDING;
+
+	private final AtomicBoolean mCancelled = new AtomicBoolean();
+	private final AtomicBoolean mTaskInvoked = new AtomicBoolean();
+
+	private static class SerialExecutor implements Executor {
+		final ArrayDeque<Runnable> mTasks = new ArrayDeque<Runnable>();
+		Runnable mActive;
+
+		public synchronized void execute(final Runnable r) {
+			mTasks.offer(new Runnable() {
+				public void run() {
+					try {
+						r.run();
+					} finally {
+						scheduleNext();
+					}
+				}
+			});
+			if (mActive == null) {
+				scheduleNext();
+			}
+		}
+
+		protected synchronized void scheduleNext() {
+			if ((mActive = mTasks.poll()) != null) {
+				THREAD_POOL_EXECUTOR.execute(mActive);
+			}
+		}
+	}
+
+	/**
+	 * Indicates the current status of the task. Each status will be set only once
+	 * during the lifetime of a task.
+	 */
+	public enum Status {
+		/**
+		 * Indicates that the task has not been executed yet.
+		 */
+		PENDING,
+		/**
+		 * Indicates that the task is running.
+		 */
+		RUNNING,
+		/**
+		 * Indicates that {@link AsyncTask#onPostExecute} has finished.
+		 */
+		FINISHED,
+	}
+
+	/** @hide Used to force static handler to be created. */
+	public static void init() {
+		sHandler.getLooper();
+	}
+
+	/** @hide */
+	public static void setDefaultExecutor(Executor exec) {
+		sDefaultExecutor = exec;
+	}
+
+	/**
+	 * Creates a new asynchronous task. This constructor must be invoked on the UI thread.
+	 */
+	public AsyncTask() {
+		mWorker = new WorkerRunnable<Params, Result>() {
+			public Result call() throws Exception {
+				mTaskInvoked.set(true);
+
+				Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
+				//noinspection unchecked
+				return postResult(doInBackground(mParams));
+			}
+		};
+
+		mFuture = new FutureTask<Result>(mWorker) {
+			@Override
+			protected void done() {
+				try {
+					postResultIfNotInvoked(get());
+				} catch (InterruptedException e) {
+					android.util.Log.w(LOG_TAG, e);
+				} catch (ExecutionException e) {
+					throw new RuntimeException("An error occured while executing doInBackground()",
+							e.getCause());
+				} catch (CancellationException e) {
+					postResultIfNotInvoked(null);
+				}
+			}
+		};
+	}
+
+	private void postResultIfNotInvoked(Result result) {
+		final boolean wasTaskInvoked = mTaskInvoked.get();
+		if (!wasTaskInvoked) {
+			postResult(result);
+		}
+	}
+
+	private Result postResult(Result result) {
+		@SuppressWarnings("unchecked")
+		Message message = sHandler.obtainMessage(MESSAGE_POST_RESULT,
+				new AsyncTaskResult<Result>(this, result));
+		message.sendToTarget();
+		return result;
+	}
+
+	/**
+	 * Returns the current status of this task.
+	 *
+	 * @return The current status.
+	 */
+	public final Status getStatus() {
+		return mStatus;
+	}
+
+	/**
+	 * Override this method to perform a computation on a background thread. The
+	 * specified parameters are the parameters passed to {@link #execute}
+	 * by the caller of this task.
+	 *
+	 * This method can call {@link #publishProgress} to publish updates
+	 * on the UI thread.
+	 *
+	 * @param params The parameters of the task.
+	 *
+	 * @return A result, defined by the subclass of this task.
+	 *
+	 * @see #onPreExecute()
+	 * @see #onPostExecute
+	 * @see #publishProgress
+	 */
+	protected abstract Result doInBackground(Params... params);
+
+	/**
+	 * Runs on the UI thread before {@link #doInBackground}.
+	 *
+	 * @see #onPostExecute
+	 * @see #doInBackground
+	 */
+	protected void onPreExecute() {
+	}
+
+	/**
+	 * <p>Runs on the UI thread after {@link #doInBackground}. The
+	 * specified result is the value returned by {@link #doInBackground}.</p>
+	 *
+	 * <p>This method won't be invoked if the task was cancelled.</p>
+	 *
+	 * @param result The result of the operation computed by {@link #doInBackground}.
+	 *
+	 * @see #onPreExecute
+	 * @see #doInBackground
+	 * @see #onCancelled(Object)
+	 */
+	@SuppressWarnings({"UnusedDeclaration"})
+	protected void onPostExecute(Result result) {
+	}
+
+	/**
+	 * Runs on the UI thread after {@link #publishProgress} is invoked.
+	 * The specified values are the values passed to {@link #publishProgress}.
+	 *
+	 * @param values The values indicating progress.
+	 *
+	 * @see #publishProgress
+	 * @see #doInBackground
+	 */
+	@SuppressWarnings({"UnusedDeclaration"})
+	protected void onProgressUpdate(Progress... values) {
+	}
+
+	/**
+	 * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
+	 * {@link #doInBackground(Object[])} has finished.</p>
+	 *
+	 * <p>The default implementation simply invokes {@link #onCancelled()} and
+	 * ignores the result. If you write your own implementation, do not call
+	 * <code>super.onCancelled(result)</code>.</p>
+	 *
+	 * @param result The result, if any, computed in
+	 *		 {@link #doInBackground(Object[])}, can be null
+	 *
+	 * @see #cancel(boolean)
+	 * @see #isCancelled()
+	 */
+	@SuppressWarnings({"UnusedParameters"})
+	protected void onCancelled(Result result) {
+		onCancelled();
+	}
+
+	/**
+	 * <p>Applications should preferably override {@link #onCancelled(Object)}.
+	 * This method is invoked by the default implementation of
+	 * {@link #onCancelled(Object)}.</p>
+	 *
+	 * <p>Runs on the UI thread after {@link #cancel(boolean)} is invoked and
+	 * {@link #doInBackground(Object[])} has finished.</p>
+	 *
+	 * @see #onCancelled(Object)
+	 * @see #cancel(boolean)
+	 * @see #isCancelled()
+	 */
+	protected void onCancelled() {
+	}
+
+	/**
+	 * Returns <tt>true</tt> if this task was cancelled before it completed
+	 * normally. If you are calling {@link #cancel(boolean)} on the task,
+	 * the value returned by this method should be checked periodically from
+	 * {@link #doInBackground(Object[])} to end the task as soon as possible.
+	 *
+	 * @return <tt>true</tt> if task was cancelled before it completed
+	 *
+	 * @see #cancel(boolean)
+	 */
+	public final boolean isCancelled() {
+		return mCancelled.get();
+	}
+
+	/**
+	 * <p>Attempts to cancel execution of this task.  This attempt will
+	 * fail if the task has already completed, already been cancelled,
+	 * or could not be cancelled for some other reason. If successful,
+	 * and this task has not started when <tt>cancel</tt> is called,
+	 * this task should never run. If the task has already started,
+	 * then the <tt>mayInterruptIfRunning</tt> parameter determines
+	 * whether the thread executing this task should be interrupted in
+	 * an attempt to stop the task.</p>
+	 *
+	 * <p>Calling this method will result in {@link #onCancelled(Object)} being
+	 * invoked on the UI thread after {@link #doInBackground(Object[])}
+	 * returns. Calling this method guarantees that {@link #onPostExecute(Object)}
+	 * is never invoked. After invoking this method, you should check the
+	 * value returned by {@link #isCancelled()} periodically from
+	 * {@link #doInBackground(Object[])} to finish the task as early as
+	 * possible.</p>
+	 *
+	 * @param mayInterruptIfRunning <tt>true</tt> if the thread executing this
+	 *		task should be interrupted; otherwise, in-progress tasks are allowed
+	 *		to complete.
+	 *
+	 * @return <tt>false</tt> if the task could not be cancelled,
+	 *		 typically because it has already completed normally;
+	 *		 <tt>true</tt> otherwise
+	 *
+	 * @see #isCancelled()
+	 * @see #onCancelled(Object)
+	 */
+	public final boolean cancel(boolean mayInterruptIfRunning) {
+		mCancelled.set(true);
+		return mFuture.cancel(mayInterruptIfRunning);
+	}
+
+	/**
+	 * Waits if necessary for the computation to complete, and then
+	 * retrieves its result.
+	 *
+	 * @return The computed result.
+	 *
+	 * @throws CancellationException If the computation was cancelled.
+	 * @throws ExecutionException If the computation threw an exception.
+	 * @throws InterruptedException If the current thread was interrupted
+	 *		 while waiting.
+	 */
+	public final Result get() throws InterruptedException, ExecutionException {
+		return mFuture.get();
+	}
+
+	/**
+	 * Waits if necessary for at most the given time for the computation
+	 * to complete, and then retrieves its result.
+	 *
+	 * @param timeout Time to wait before cancelling the operation.
+	 * @param unit The time unit for the timeout.
+	 *
+	 * @return The computed result.
+	 *
+	 * @throws CancellationException If the computation was cancelled.
+	 * @throws ExecutionException If the computation threw an exception.
+	 * @throws InterruptedException If the current thread was interrupted
+	 *		 while waiting.
+	 * @throws TimeoutException If the wait timed out.
+	 */
+	public final Result get(long timeout, TimeUnit unit) throws InterruptedException,
+			ExecutionException, TimeoutException {
+		return mFuture.get(timeout, unit);
+	}
+
+	/**
+	 * Executes the task with the specified parameters. The task returns
+	 * itself (this) so that the caller can keep a reference to it.
+	 *
+	 * <p>Note: this function schedules the task on a queue for a single background
+	 * thread or pool of threads depending on the platform version.  When first
+	 * introduced, AsyncTasks were executed serially on a single background thread.
+	 * Starting with {@link android.os.Build.VERSION_CODES#DONUT}, this was changed
+	 * to a pool of threads allowing multiple tasks to operate in parallel. Starting
+	 * {@link android.os.Build.VERSION_CODES#HONEYCOMB}, tasks are back to being
+	 * executed on a single thread to avoid common application errors caused
+	 * by parallel execution.  If you truly want parallel execution, you can use
+	 * the {@link #executeOnExecutor} version of this method
+	 * with {@link #THREAD_POOL_EXECUTOR}; however, see commentary there for warnings
+	 * on its use.
+	 *
+	 * <p>This method must be invoked on the UI thread.
+	 *
+	 * @param params The parameters of the task.
+	 *
+	 * @return This instance of AsyncTask.
+	 *
+	 * @throws IllegalStateException If {@link #getStatus()} returns either
+	 *		 {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+	 *
+	 * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+	 * @see #execute(Runnable)
+	 */
+	public final AsyncTask<Params, Progress, Result> execute(Params... params) {
+		return executeOnExecutor(sDefaultExecutor, params);
+	}
+
+	/**
+	 * Executes the task with the specified parameters. The task returns
+	 * itself (this) so that the caller can keep a reference to it.
+	 *
+	 * <p>This method is typically used with {@link #THREAD_POOL_EXECUTOR} to
+	 * allow multiple tasks to run in parallel on a pool of threads managed by
+	 * AsyncTask, however you can also use your own {@link Executor} for custom
+	 * behavior.
+	 *
+	 * <p><em>Warning:</em> Allowing multiple tasks to run in parallel from
+	 * a thread pool is generally <em>not</em> what one wants, because the order
+	 * of their operation is not defined.  For example, if these tasks are used
+	 * to modify any state in common (such as writing a file due to a button click),
+	 * there are no guarantees on the order of the modifications.
+	 * Without careful work it is possible in rare cases for the newer version
+	 * of the data to be over-written by an older one, leading to obscure data
+	 * loss and stability issues.  Such changes are best
+	 * executed in serial; to guarantee such work is serialized regardless of
+	 * platform version you can use this function with {@link #SERIAL_EXECUTOR}.
+	 *
+	 * <p>This method must be invoked on the UI thread.
+	 *
+	 * @param exec The executor to use.  {@link #THREAD_POOL_EXECUTOR} is available as a
+	 *			  convenient process-wide thread pool for tasks that are loosely coupled.
+	 * @param params The parameters of the task.
+	 *
+	 * @return This instance of AsyncTask.
+	 *
+	 * @throws IllegalStateException If {@link #getStatus()} returns either
+	 *		 {@link AsyncTask.Status#RUNNING} or {@link AsyncTask.Status#FINISHED}.
+	 *
+	 * @see #execute(Object[])
+	 */
+	public final AsyncTask<Params, Progress, Result> executeOnExecutor(Executor exec,
+			Params... params) {
+		if (mStatus != Status.PENDING) {
+			switch (mStatus) {
+				case RUNNING:
+					throw new IllegalStateException("Cannot execute task:"
+							+ " the task is already running.");
+				case FINISHED:
+					throw new IllegalStateException("Cannot execute task:"
+							+ " the task has already been executed "
+							+ "(a task can be executed only once)");
+			}
+		}
+
+		mStatus = Status.RUNNING;
+
+		onPreExecute();
+
+		mWorker.mParams = params;
+		exec.execute(mFuture);
+
+		return this;
+	}
+
+	/**
+	 * Convenience version of {@link #execute(Object...)} for use with
+	 * a simple Runnable object. See {@link #execute(Object[])} for more
+	 * information on the order of execution.
+	 *
+	 * @see #execute(Object[])
+	 * @see #executeOnExecutor(java.util.concurrent.Executor, Object[])
+	 */
+	public static void execute(Runnable runnable) {
+		sDefaultExecutor.execute(runnable);
+	}
+
+	/**
+	 * This method can be invoked from {@link #doInBackground} to
+	 * publish updates on the UI thread while the background computation is
+	 * still running. Each call to this method will trigger the execution of
+	 * {@link #onProgressUpdate} on the UI thread.
+	 *
+	 * {@link #onProgressUpdate} will note be called if the task has been
+	 * canceled.
+	 *
+	 * @param values The progress values to update the UI with.
+	 *
+	 * @see #onProgressUpdate
+	 * @see #doInBackground
+	 */
+	protected final void publishProgress(Progress... values) {
+		if (!isCancelled()) {
+			sHandler.obtainMessage(MESSAGE_POST_PROGRESS,
+					new AsyncTaskResult<Progress>(this, values)).sendToTarget();
+		}
+	}
+
+	private void finish(Result result) {
+		if (isCancelled()) {
+			onCancelled(result);
+		} else {
+			onPostExecute(result);
+		}
+		mStatus = Status.FINISHED;
+	}
+
+	private static class InternalHandler extends Handler {
+		@SuppressWarnings({"unchecked", "RawUseOfParameterizedType"})
+		@Override
+		public void handleMessage(Message msg) {
+			AsyncTaskResult result = (AsyncTaskResult) msg.obj;
+			switch (msg.what) {
+				case MESSAGE_POST_RESULT:
+					// There is only one result
+					result.mTask.finish(result.mData[0]);
+					break;
+				case MESSAGE_POST_PROGRESS:
+					result.mTask.onProgressUpdate(result.mData);
+					break;
+			}
+		}
+	}
+
+	private static abstract class WorkerRunnable<Params, Result> implements Callable<Result> {
+		Params[] mParams;
+	}
+
+	@SuppressWarnings({"RawUseOfParameterizedType"})
+	private static class AsyncTaskResult<Data> {
+		final AsyncTask mTask;
+		final Data[] mData;
+
+		AsyncTaskResult(AsyncTask task, Data... data) {
+			mTask = task;
+			mData = data;
+		}
+	}
 }