package com.zone.weixin4j.handler;
   
   import com.zone.weixin4j.exception.WeixinException;
   import com.zone.weixin4j.request.WeixinMessage;
   import com.zone.weixin4j.request.WeixinRequest;
   
   import java.util.HashSet;
   import java.util.Set;
   
  /**
   * 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)
  			throws WeixinException {
  		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
  	 */
  	public boolean canHandle0(WeixinRequest request, WeixinMessage message) throws WeixinException {
  		return true;
  	}
  
  	@Override
  	public int weight() {
  		return 1;
  	}
  }