Enforcing character case in a context variable or string

Products

• CA API Gateway

Issue/Introduction

The CA API Gateway can use XSL transformations to manipulate strings in various ways. It may be necessary to case the characters in a string or context variable to either all upper- or lowercase. A stylesheet can be used to modify non-XML messages using XSL transformations. This methodology can be used in a service policy to manipulate non-XML strings.

Environment

All supported versions of the API Gateway

Resolution

The following stylesheet can be used to force character casing for a particular context variable or string:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes"/>
    <xsl:param name="foo"/>
    <xsl:template match="/">
             <xsl:variable name="lowercase" select="'abcdefghijklmnopqrstuvwxyz'"/>
       <xsl:variable name="uppercase" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/>
         <xsl:value-of select="translate($foo,$uppercase,$lowercase)"/>
    </xsl:template>
</xsl:stylesheet>

The value of the foo context variable as set in the published service policy will be transformed from lowercase to uppercase. The values $uppercase and $lowercase in the value-of element can be swapped in order to transform from uppercase to lowercase. A sample policy that sets a context variable and executes a case change is attached to this article.

Attachments:

• forcingCharCase.xml