add isAdmin method for RoleVO

mooctest-site-server/src/main/java/cn/iselab/mooctest/site/web/data/RoleVO.java

@@ -9,6 +9,8 @@ import com.fasterxml.jackson.annotation.JsonInclude;
 @JsonInclude(JsonInclude.Include.NON_NULL)
 public class RoleVO extends BaseVO {
 
+    public static final int ROLE_ADMIN = 1;
+
     private Long id;
 
     private String name;
@@ -38,4 +40,8 @@ public class RoleVO extends BaseVO {
     public void setCreateTime(Long createTime) {
         this.createTime = createTime;
     }
+
+    public boolean isAdmin() {
+        return getId() == ROLE_ADMIN;
+    }
 }