LookupListener中的resultChanged方法是在EDT中执行么？

下面是LookupListener接口的定义

package org.openide.util;

import java.util.*;


/** General listener for changes in lookup.
 *
 * @author  Jaroslav Tulach
 */
public interface LookupListener extends EventListener {
    /** A change in lookup occured. Please note that this method
     * should never block since it might be called from lookup implementation
     * internal threads. If you block here you are in risk that the thread
     * you wait for might in turn to wait for the lookup internal thread to
     * finish its work.
     * @param ev event describing the change
     */
    public void resultChanged(LookupEvent ev);
}

 TopComponent实现了LookupListener接口，并注册为result = Utilities.actionsGlobalContext().lookupResult(XXX.class)的监听器

问题：TopComponent覆盖的resultChanged是否在EDT中执行。

1 尝试在resultChanged中输出当前线程名：Thread[AWT-EventQueue-0,6,IDE Main]

2 在这篇教程中http://platform.netbeans.org/tutorials/nbm-selection-1.html，其resultChanged方法中直接调用了修改JLabel对象文本的方法，如下

    @Override
    public void resultChanged(LookupEvent lookupEvent) {
        Lookup.Result r = (Lookup.Result) lookupEvent.getSource();
        Collection c = r.allInstances();
        if (!c.isEmpty()) {
            APIObject o = (APIObject) c.iterator().next();
            jLabel1.setText (Integer.toString(o.getIndex()));
            jLabel2.setText (o.getDate().toString());
        } else {
            jLabel1.setText("[no selection]");
            jLabel2.setText ("");
        }
    }

 总结：resultChanged很可能直接在EDT中执行，但尚未找到明确的说明。