content: package act.event;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.App;
  import act.app.event.SysEvent;
  import act.app.event.SysEventId;
  import act.app.event.SysEventListener;
  import act.util.SubTypeFinder;
  import org.osgl.$;
  
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.util.EventObject;
  
  public class EventListenerClassFinder extends SubTypeFinder<ActEventListener> {
  
      public EventListenerClassFinder() {
          super(ActEventListener.class);
      }
  
      @Override
      protected void found(final Class<? extends ActEventListener> target, final App app) {
          final EventBus bus = app.eventBus();
          ParameterizedType ptype = null;
          Type superType = target.getGenericSuperclass();
          while (ptype == null) {
              if (superType instanceof ParameterizedType) {
                  ptype = (ParameterizedType) superType;
              } else {
                  if (Object.class == superType) {
                      logger.warn("Event listener registration failed: cannot find generic information for %s", target.getName());
                      return;
                  }
                  superType = ((Class) superType).getGenericSuperclass();
              }
          }
          Type[] ca = ptype.getActualTypeArguments();
          for (Type t : ca) {
              if (t instanceof Class) {
                  final Class<? extends EventObject> tc = $.cast(t);
                  if (SysEvent.class.isAssignableFrom(tc)) {
                      SysEvent prototype = $.cast($.newInstance(tc, app));
                      SysEventListener listener = $.cast(app.getInstance(target));
                      app.eventBus().bind(SysEventId.values()[prototype.id()], listener);
                  } else if (ActEvent.class.isAssignableFrom(tc)) {
                      SysEventId bindOn = SysEventId.START;
                      BindOn bindOnSpec = target.getAnnotation(BindOn.class);
                      if (null == bindOnSpec) {
                          bindOnSpec = tc.getAnnotation(BindOn.class);
                      }
                      if (null != bindOnSpec) {
                          bindOn = bindOnSpec.value();
                      }
                      app.eventBus().bind(bindOn, new SysEventListenerBase() {
                          @Override
                          public void on(EventObject event) throws Exception {
                              ActEventListener listener = app.getInstance(target);
                              bus.bind(tc, listener);
                          }
                      });
                      return;
                  }
              }
          }
      }
  }
  