public interface Trashable
{
    // Consider adding a "date trashed" and "user" properties.

    /**
     * Get the name of the trashable item.
     *
     * @return the name.
     */
    String getName();

    /**
     * Get the site the trashable item belongs.
     *
     * @return the site.
     */
    Site getSite();

    /**
     * Return true if the element is trashed.
     *
     * @return true or false.
     */
    boolean isTrashed();

    /**
     * Set the trashed value.
     *
     * @param value the value. True indicates the entity is in the trash.
     */
    void setTrashed(boolean value);
}

public interface PageElement extends Trashable, Serializable
{
  [snip]
}

public interface ContentElement extends PageElement
{
  [snip]
}

{
		// if no getter found yet, check all implemented interfaces
		if ( getter == null ) {
			for ( Class theInterface : containerClass.getInterfaces() ) {
				getter = getGetterOrNull( theInterface, propertyName );
				if ( getter != null ) {
					break;
				}
			}
		}
}

{
        // if no getter found yet, check all implemented interfaces
        if (getter == null)
        {
            ArrayDeque<Class<?>> stack = new ArrayDeque<>();
            for (Class<?> aClass : containerClass.getInterfaces()) stack.push(aClass);
            while(!stack.isEmpty())
            {
                Class<?> theInterface = stack.pop();
                for (Class<?> aClass : theInterface.getInterfaces()) stack.push(aClass);
                getter = getGetterOrNull(theInterface, propertyName);
                if (getter != null)
                {
                    break;
                }
            }
        }
}