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Re: [xsl] Data-driven XSLT code using dynamic mode values?


Subject: Re: [xsl] Data-driven XSLT code using dynamic mode values?
From: Hermann Stamm-Wilbrandt <STAMMW@xxxxxxxxxx>
Date: Fri, 2 Aug 2013 16:52:16 +0200

You did not specify which XSLT version you are interested in.

For XSLT 1.0 the <xsl:choose> solution you showed is the only solution.


Mit besten Gruessen / Best wishes,

Hermann Stamm-Wilbrandt
Level 3 support for XML Compiler team and Fixpack team lead
WebSphere DataPower SOA Appliances
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
https://twitter.com/HermannSW/     http://www.stamm-wilbrandt.de/ce/
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  |"Costello, Roger L." <costello@xxxxxxxxx>                                                                                                         |
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  |"xsl-list@xxxxxxxxxxxxxxxxxxxxxx" <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>,                                                                              |
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  |08/02/2013 04:26 PM                                                                                                                               |
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  |[xsl] Data-driven XSLT code using dynamic mode values?                                                                                            |
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Hi Folks,

I want to have multiple templates for the same element, each template
processes the element differently.

"Use modes," you say.

Okay, sounds good. So I will have multiple template rules:

    <xsl:template match="Header" mode="Remove">

    <xsl:template match="Header" mode="Replace">

    <xsl:template match="Header" mode="Reject">

Now let's turn to the problem of firing the appropriate template rule.

I have a variable which has a value that indicates whether I should do a
Remove, Replace, or Reject:

    <xsl:variable name="action" select="get the action from an XML file" />

I want to fire a template rule based on the value of $action.

Here's what I really, really want to do:

    <xsl:apply-templates select="." mode="$action" />

That would be so cool. That would truly be "data-driven code."

Unfortunately, using a variable as the value of @mode is not allowed.

Bummer.

Is my only solution to use xsl:choose:

          <xsl:choose>
              <xsl:when test="$action eq 'Remove'">
                  <xsl:apply-templates select="." mode="Remove" />
              </xsl:when>
              <xsl:when test="$action eq 'Replace'">
                  <xsl:apply-templates select="." mode="Replace" />
              </xsl:when>
              <xsl:when test="$action eq 'Reject'">
                  <xsl:apply-templates select="." mode="Reject" />
              </xsl:when>
          </xsl:choose>

That is an awful solution. It is brittle and not extensible code.

Please, please show me a better way than using xsl:choose.

/Roger


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