package com.foxinmy.weixin4j.handler;
   
   import java.util.HashSet;
   import java.util.Set;
   
   import com.foxinmy.weixin4j.request.WeixinMessage;
   import com.foxinmy.weixin4j.request.WeixinRequest;
   
   /**
   * 多个消息类型适配
   *
   * @className MultipleMessageHandlerAdapter
   * @author jinyu(foxinmy@gmail.com)
   * @date 2016年3月12日
   * @since JDK 1.6
   * @see
   */
  public abstract class MultipleMessageHandlerAdapter implements WeixinMessageHandler {
  
      private final Set<Class<? extends WeixinMessage>> messageClasses;
  
      public MultipleMessageHandlerAdapter(Class<? extends WeixinMessage>... messageClasses) {
          if (messageClasses == null) {
              throw new IllegalArgumentException("messageClasses not be empty");
          }
          this.messageClasses = new HashSet<Class<? extends WeixinMessage>>(
                  Math.max((int) (messageClasses.length / .75f) + 1, 16));
          for (Class<? extends WeixinMessage> clazz : messageClasses) {
              this.messageClasses.add(clazz);
          }
      }
  
      @Override
      public boolean canHandle(WeixinRequest request, WeixinMessage message, Set<String> nodeNames) {
          return message != null && messageClasses.contains(message.getClass()) && canHandle0(request, message);
      }
  
      /**
       * 能否处理请求
       *
       * @param request
       *            微信请求
       * @param message
       *            微信消息
       * @return true则执行doHandler
       * @throws WeixinException
       */
      protected boolean canHandle0(WeixinRequest request, WeixinMessage message) {
          return true;
      }
  
      @Override
      public int weight() {
          return 1;
      }
  }