如何在骆驼中找到Xpath并为标签添加值

Question

I'm trying to find an Xpath from exchange body and add a value to the tag.

<root>
<details1>    
   <Name>Ying</Name>
   <status></status>
</details1>
<details2>    
   <Name>Ying</Name>
   <status></status>
</details2>
</root>

I want to find xPath=root/details2/status From this exchange body and add value to the status. Since there are two occurances of status in the body String I will not be able to use String1.replace('<status></status>',<status>no</status>) Is there any way to use camel Xpath to find the correct tag and add the value?

Answer 1

With xpath you can find and read the correct tag. But how are you going to write it? One solution could be to use the xpath inside an xlst tranformation. So you can add the value you want to put in the element in a camel header "myHeader" and then use it in the xslt as an xsl:param .

Assuming the xml is in the inbox folder then

 from("file:inbox?noop=true")
 .setHeader("myHeader",constant("no"))
 .to("xslt:mytransform.xslt")
 .to("file:outbox/?fileName=out.xml");

Will put the value "no" in root/details2/status.

Where mytransform.xlst inside your /src/main/resources folder is like

<xsl:stylesheet version="1.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes" indent="yes"/>
    <xsl:strip-space elements="*"/>
    <xsl:param name="myHeader"/>

    <xsl:template match="node()|@*">
        <xsl:copy>
            <xsl:apply-templates select="node()|@*"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="/root/details2/status[. = '']">
        <status><xsl:value-of select="$myHeader"/></status>
    </xsl:template>
</xsl:stylesheet>

Xpath /root/details2/status[. = ''] matches empty status elements