AsyncImage.java 文件源码

/**
 * Returns the real image source, if already present. Otherwise, this
 * returns <code>null</code>.
 *
 * @return the real image source, or <code>null</code> if not present
 */
private ImageProducer getRealSource()
{
  synchronized (AsyncImage.this)
    {
      ImageProducer source = realSource;
      if (source == null)
        {
          Image ri = realImage;
          if (ri != null)
            {
              realSource = source = ri.getSource();
            }
        }
      return source;
    }
}