wso2 ESB 中是否有用于字符串填充的 XPath 表达式? [英] Is there any XPath expression for String Padding in wso2 ESB?
问题描述
我在 synapse.properties 中启用了 XPath 2.0 配置 synapse.xpath.dom.failover.enabled=true 但仍然无法完成字符串填充.有什么表达方式可以实现吗?
I have enabled XPath 2.0 configuration synapse.xpath.dom.failover.enabled=true in synapse.properties but still unable to get string padding done. Is there any expression to achieve it?
特定字符串的长度需要为 10 个字符，如果小于它，我们必须用特殊字符 '%' 填充它.
The length of a particular string needs to be 10 chars, if it is lesser than it, we have to pad it with the special character '%'.
例如，Input = 'WSO2'，填充后应该是'WSO2%%%%%%'
Eg., Input = 'WSO2', after padding it should be 'WSO2%%%%%%'
提前致谢
推荐答案
这可以像这样使用 XPath 1.0 来实现，假设在实际实现中 "WSO2" 将被动态输入字符串替换:
This can be achieved using XPath 1.0 like so, assuming that "WSO2" will be replaced by dynamic input string in the actual implementation :
substring(concat('WSO2', '%%%%%%%%%%'), 1, 10)
上述 XPath 的工作原理基本上是将 10 个特定的 for-padding 字符的字符串连接到原始输入字符串，然后将结果子串化以仅获取前 10 个字符.在以下 XSL 问题中发现了这个技巧:XSL 左右对齐与 Padding
The above XPath basically works by concatenating string of 10 specific for-padding characters to the original input string, and then substring the result to get only the first 10 characters. Found this trick in the following XSL question : XSL left-right justification with Padding
把它放在一个更通用的公式中:
To put this in a more generic formula :
substring(concat('input_string', '%%%%....'), 1, n)
input_string: 填充操作将应用到的字符串%: 用于填充的字符，重复n次n: 输出字符串中预期的固定字符数input_string: string to which padding operation will applied%: character used for padding, repeatedntimesn: fixed number of characters expected in the output string
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