issue #77 添加自定义消息匹配器的支持

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpMessageMatcher.java

@@ -0,0 +1,17 @@
+package me.chanjar.weixin.mp.api;
+
+import me.chanjar.weixin.mp.bean.WxMpXmlMessage;
+
+/**
+ * 消息匹配器，用在消息路由的时候
+ */
+public interface WxMpMessageMatcher {
+
+  /**
+   * 消息是否匹配某种模式
+   * @param message
+   * @return
+   */
+  public boolean match(WxMpXmlMessage message);
+
+}

weixin-java-mp/src/main/java/me/chanjar/weixin/mp/api/WxMpMessageRouter.java

@@ -225,7 +225,9 @@ public class WxMpMessageRouter {
     private String content;
     
     private String rContent;
-    
+
+    private WxMpMessageMatcher matcher;
+
     private boolean reEnter = false;
     
     private List<WxMpMessageHandler> handlers = new ArrayList<WxMpMessageHandler>();
@@ -306,6 +308,16 @@ public class WxMpMessageRouter {
       return this;
     }
 
+    /**
+     * 如果消息匹配某个matcher，用在用户需要自定义更复杂的匹配规则的时候
+     * @param matcher
+     * @return
+     */
+    public Rule matcher(WxMpMessageMatcher matcher) {
+      this.matcher = matcher;
+      return this;
+    }
+
     /**
      * 设置微信消息拦截器
      * @param interceptor
@@ -387,6 +399,8 @@ public class WxMpMessageRouter {
           (this.content == null || this.content.equals(wxMessage.getContent() == null ? null : wxMessage.getContent().trim()))
           &&
           (this.rContent == null || Pattern.matches(this.rContent, wxMessage.getContent() == null ? "" : wxMessage.getContent().trim()))
+          &&
+          (this.matcher == null || this.matcher.match(wxMessage))
       ;
     }