mybatis mapper.xml文件中判断属性类型

参考文档：apache ognl 参考文档

假设map.id有两种类型，String或Array（别抬杠，我就想这么处理）
之前的写法：

<where>
	<if test="map.id !=null and map.id != ''">
	AND asset.id in
	    <foreach collection="map.id" item="item" open="(" close=")" separator=",">#{item}</foreach>
	</if>
</where>

这样如果传进来的id是String型，将会报错：
Error evaluating expression ‘xxx’. Return value (xxx) was not iterable.

那么如何在mapper.xml里面判断两种属性呢

<where>
    <choose>
        <when test="map.id instanceof String">
        AND asset.id = #{map.id}
        </when>
        <otherwise>
            <if test="map.id !=null and map.id != ''">
            AND asset.id in
                <foreach collection="map.id" item="item" open="(" close=")" separator=",">#{item}</foreach>
            </if>
        </otherwise>
    </choose>
</where>