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.event.SysEventListener;
  import act.util.LogSupportedDestroyableBase;
  import org.osgl.util.S;
  
  import java.util.EventObject;
  import java.util.concurrent.atomic.AtomicInteger;
  
  public abstract class ActEventListenerBase<EVENT_TYPE extends EventObject> extends LogSupportedDestroyableBase implements ActEventListener<EVENT_TYPE> {
  
      private static final AtomicInteger ID_ = new AtomicInteger();
  
      private String id;
      public ActEventListenerBase(CharSequence id) {
          if (null == id) {
              id = genId();
          }
          this.id = id.toString();
      }
  
      public ActEventListenerBase() {
          this(genId());
      }
  
      @Override
      public String id() {
          return id;
      }
  
      @Override
      public int hashCode() {
          return id.hashCode();
      }
  
      @Override
      public final boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (obj instanceof SysEventListener) {
              SysEventListener that = (SysEventListener) obj;
              return S.eq(that.id(), this.id());
          }
          return false;
      }
  
      private static String genId() {
          return S.random(3) + ID_.getAndIncrement();
      }
  
  }
  