package com.foxinmy.weixin4j.handler;
   
   import java.util.Set;
   
   import com.foxinmy.weixin4j.request.WeixinMessage;
   import com.foxinmy.weixin4j.request.WeixinRequest;
   import com.foxinmy.weixin4j.response.WeixinResponse;
   import com.foxinmy.weixin4j.util.ClassUtil;
   
  /**
   * 消息适配器:对于特定的消息类型进行适配,如text文本、voice语音消息
   *
   * @className MessageHandlerAdapter
   * @author jinyu(foxinmy@gmail.com)
   * @date 2015年5月17日
   * @since JDK 1.6
   * @see com.foxinmy.weixin4j.request.WeixinMessage
   */
  @SuppressWarnings("unchecked")
  public abstract class MessageHandlerAdapter<M extends WeixinMessage> implements
  		WeixinMessageHandler {
  
  	@Override
  	public boolean canHandle(WeixinRequest request, WeixinMessage message,
  			Set<String> nodeNames) {
  		return message != null
  				&& message.getClass() == ClassUtil.getGenericType(getClass())
  				&& canHandle0(request, (M) message);
  	}
  
  	/**
  	 * 能否处理请求
  	 *
  	 * @param request
  	 *            微信请求
  	 * @param message
  	 *            微信消息
  	 * @return true则执行doHandler0 @
  	 */
  	protected boolean canHandle0(WeixinRequest request, M message) {
  		return true;
  	}
  
  	@Override
  	public WeixinResponse doHandle(WeixinRequest request, WeixinMessage message) {
  		return doHandle0((M) message);
  	}
  
  	/**
  	 * 处理请求
  	 *
  	 * @param message
  	 *            微信消息
  	 * @return
  	 */
  	protected abstract WeixinResponse doHandle0(M message);
  
  	/**
  	 * 缺省值为1,存在多个匹配到的MessageHandler则比较weight大小
  	 */
  	@Override
  	public int weight() {
  		return 1;
  	}
  }