Subject: [xsl] Recursion From: Vasu Chakkera <vasucv@xxxxxxxxx> Date: Mon, 28 May 2012 11:58:09 +0100 |
Guys, I had this issue, which I solved, but thought someone here could probably recreate with some better ideas?? I did not refractor this.. so , I am sure the code can be refractored or rearranged/ beautified .. But I am wanting to see if there is a completely different approach... The problem is as folllows.. XSLT is written for an XSD. This XSD may include another XSD and that may include more XSDs and so on and so forth,. This can end up becoming a huge tree. Some where, one of the XSDs can actually refer to another XSD which could have been already in the tree. So a normall thought process is that your XSLT will fail because it will end up into the infinite recursion ( circular reference).. So I wrote this XSLT to process such a tree... I have simulated this one with XMLS with nodes that are called <includes> // Main XML : ======= <xml1> <includes>file1.xml</includes> <includes>file2.xml</includes> </xml1> file1.xml ======= <xml1> <includes>file1.1.xml</includes> <includes>file1.2.xml</includes> </xml1> file2.xml ======= <xml1> <includes>file2.1.xml</includes> <includes>file2.2.xml</includes> </xml1> file1.1.xml ======= <xml1> <includes>file1.1.1xml</includes> <includes>file1.xml <!-- this one is bad circular reference --> </includes> </xml1> and so on... The XSLT is ======== <?xml version="1.0" encoding="UTF-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0"> <xsl:template match="xml1"> <xsl:call-template name="get-include"> <xsl:with-param name="init" select="0"/> </xsl:call-template> </xsl:template> <xsl:template name="get-include"> <xsl:param name="document-name"/> <xsl:param name="init"/> <xsl:param name="include-tree"/> <xsl:choose> <xsl:when test="$init = 1"> <xsl:for-each select="document($document-name)//includes"> <xsl:variable name="doc-name" select="."/> <xsl:value-of select="."/> <xsl:choose> <xsl:when test="contains($include-tree,$doc-name)"> <xsl:text>: This file is ignored : Circular Reference </xsl:text> <xsl:text>
</xsl:text> </xsl:when> <xsl:otherwise> <xsl:text>,</xsl:text> <xsl:call-template name="get-include"> <xsl:with-param name="document-name" select="$doc-name"/> <xsl:with-param name="init" select="1"/> <xsl:with-param name="include-tree" select="concat($include-tree,'/',$doc-name,'/')"/> </xsl:call-template> </xsl:otherwise> </xsl:choose> <xsl:text>
</xsl:text> </xsl:for-each> </xsl:when> <xsl:otherwise> <xsl:for-each select="//includes"> <xsl:text> 
 </xsl:text> <xsl:variable name="doc-name" select="."/> <xsl:value-of select="."/> <xsl:call-template name="get-include"> <xsl:with-param name="document-name" select="."/> <xsl:with-param name="init" select="1"/> <xsl:with-param name="include-tree" select="concat($include-tree,'/',$doc-name)"/> </xsl:call-template> </xsl:for-each> </xsl:otherwise> </xsl:choose> </xsl:template> </xsl:stylesheet> Any Ideas?? Vasu Chakkera
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