com.github.kevinsawicki.wishlist.AsyncLoader Maven / Gradle / Ivy

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/*
 * Copyright (C) 2011 Alexander Blom
 *
 * 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.github.kevinsawicki.wishlist;

import android.content.Context;
import android.support.v4.content.AsyncTaskLoader;

/**
 * Loader which extends AsyncTaskLoaders and handles caveats as pointed out in
 * http://code.google.com/p/android/issues/detail?id=14944.
 * 
 * Based on CursorLoader.java in the Fragment compatibility package
 *
 * @param 
 *          data type
 * @author Alexander Blom ([email protected])
 */
public abstract class AsyncLoader extends AsyncTaskLoader {

  private D data;

  /**
   * Create async loader
   *
   * @param context
   */
  public AsyncLoader(final Context context) {
    super(context);
  }

  @Override
  public void deliverResult(final D data) {
    if (isReset())
      // An async query came in while the loader is stopped
      return;

    this.data = data;

    super.deliverResult(data);
  }

  @Override
  protected void onStartLoading() {
    if (data != null)
      deliverResult(data);

    if (takeContentChanged() || data == null)
      forceLoad();
  }

  @Override
  protected void onStopLoading() {
    // Attempt to cancel the current load task if possible.
    cancelLoad();
  }

  @Override
  protected void onReset() {
    super.onReset();

    // Ensure the loader is stopped
    onStopLoading();

    data = null;
  }
}