修剪 Camel 路由中使用的 xpath 表达式

发布于 2024-11-16 15:42:44 字数 1231 浏览 1 评论 0原文

这可能是骆驼问题或 xpath 问题:)。非camel人员请注意：camel使用javax.xml.xpath来解析他们的xml。

在骆驼路线中，我试图从 xml 主体中提取一个元素用作我的文件名：

Namespaces ns = getNamespaces();

String fileIDxPath = (see notes);

from("direct:testOutToFile")
    .setHeader(Exchange.FILE_NAME, ns.xpath(fileIDxPath))
    .to("file:/tmp/testing/generatedXML");

但我似乎无法获得一个 xpath 来为我提供节点的修剪值 。这是我尝试过的 xpath：

A) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/
B) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()
C) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()[normalize-space()]
D) normalize-space(//rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text())

A) 返回整个节点，而不仅仅是值
B) 返回值，但包含大量空格
C) 还返回包含所有空格的值
D) 抛出 XPathExpressionException

问题对于 xpath 专家来说 - 我是否在 xpath 中遗漏了一些可以修剪此值的内容？

骆驼专家的问题 - 也许我可以在评估后修剪这个值？我知道我可以通过另一个步骤来传递它，但我认为这将是一个足够常见的用例，可以在 ns.xpath 调用本身中得到支持。

我还注意到 ns.xpath 将标头设置为“com.sun.org.apache.xml.internal.dtm.ref.DTMNodeList”的实例，而不是 String，这将是预期的类型。

谢谢大家，
罗伊

原文

This might be either a camel or an xpath question :). Note to non-camel folks: camel uses javax.xml.xpath to resolve their xml.

In a camel route, I'm trying to pull an element out of the xml body to use as my filename:

Namespaces ns = getNamespaces();

String fileIDxPath = (see notes);

from("direct:testOutToFile")
    .setHeader(Exchange.FILE_NAME, ns.xpath(fileIDxPath))
    .to("file:/tmp/testing/generatedXML");

But I can't seem to get an xpath that gives me the trimmed value of the node. Here's the xpath that I've tried:

A) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/
B) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()
C) //rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()[normalize-space()]
D) normalize-space(//rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text())

A) Returns the whole node, not just the value
B) Returns the value, but with loads of whitespace
C) Also returns the value with all of the whitespace
D) Throws XPathExpressionException

Question for xpath gurus - am I missing something in my xpath that would trim this value?

Question for camel gurus - maybe I can trim this value after it's evaluated? I know I could pass it through another step, but I'd think that this would be a common enough use case to be supported in the ns.xpath call itself.

I also noticed that the ns.xpath sets the header to an instance of 'com.sun.org.apache.xml.internal.dtm.ref.DTMNodeList' instead String, which would be the expected type.

Thanks all,
Roy

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瑕疵 2024-11-23 15:42:44

试试这个...它在 2.8-SNAPSHOT 中工作正常

.setHeader(Exchange.FILE_NAME, 
           XPathBuilder.xpath("normalize-space(//rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()", String.class))

try this...it works fine in 2.8-SNAPSHOT

.setHeader(Exchange.FILE_NAME, 
           XPathBuilder.xpath("normalize-space(//rm:TradeMsg/rm:Submitter/rm:partyTradeIdentifier/fpml:tradeId/text()", String.class))

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