Android Open Source - android-deferred-object Deferred Async Task

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License

The source code is released under:

GNU General Public License

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Java Source Code

package org.codeandmagic.deferredobject.android;
/*from   ww  w  .j  av  a 2  s. c  o  m*/
import org.codeandmagic.deferredobject.AbstractPromise;

import android.os.AsyncTask;

public abstract class DeferredAsyncTask<Resolved, Rejected, Progress> extends
    AbstractPromise<Resolved, Rejected, Progress> {

  public final AsyncTask<Void, Progress, Resolved> task;
  private Exception exception;

  public DeferredAsyncTask() {
    task = new AsyncTask<Void, Progress, Resolved>() {

      @Override
      protected void onCancelled() {
        DeferredAsyncTask.this.fail(null);
      }

      @Override
      protected void onPostExecute(Resolved resolved) {
        if (null == resolved) DeferredAsyncTask.this
                    .reject(convertExceptionToFailure(exception));
        else {
          final Rejected rejected = convertResultToFailure(resolved);
          if (null == rejected) DeferredAsyncTask.this.resolve(resolved);
          else DeferredAsyncTask.this.reject(rejected);
        }
      }

      @Override
      protected void onProgressUpdate(Progress... progress) {
        DeferredAsyncTask.this.notify(progress[0]);
      }

      @Override
      protected Resolved doInBackground(Void... params) {
        try {
          return DeferredAsyncTask.this.doInBackground();
        }
        catch (Exception e) {
          exception = e;
          return null;
        }
      }
    }.execute();
  }

  protected abstract Resolved doInBackground() throws Exception;

  protected Rejected convertResultToFailure(Resolved resolved) {
    return null;
  }

  protected Rejected convertExceptionToFailure(Exception exception) {
    return null;
  }

  public static class TaskException extends RuntimeException {
    private static final long serialVersionUID = -4400838550293270727L;

    public TaskException(Throwable cause) {
      super(cause);
    }
  }
}

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