Hi all,
I have a tree structure backend template:
<xs:element name="nodes">
<xs:complexType>
<xs:sequence>
<xs:element name="node" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element ref="node" minOccurs="0"
maxOccurs="unbounded"/>
<xs:element name="nl-NL" type="xs:string"/>
<xs:element name="label" type="xs:string"/>
</xs:sequence>
<xs:attribute name="id" type="xs:string"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
I want to generate an autonumber id for each item in a tree. Once strict rule
is that once an id is giving to an element it should never be reused. Even id's
of elements that are deleted.
To implement this i use an post processing xslt:
<xsl:import href="extensions://types/resources/xsl//autoids.xsl"/>
<xsl:variable name="max_id_stored" select="/nodes/@maxid"/>
<xsl:variable name="CONTAINER_EL">node</xsl:variable>
<xsl:variable name="ID_ATTR">id</xsl:variable>
<xsl:variable name="ELM_IGNORE">state</xsl:variable>
<xsl:template match="nodes">
<nodes maxid="{$new_max_id}">
<xsl:apply-templates select="*"/>
</nodes>
</xsl:template>
where maxid is constantly updated!.
the autoid.xsl contains:
<xsl:variable name="max">
<xsl:call-template name="max">
<xsl:with-param name="nodes"
select="//*[name()=$CONTAINER_EL]/@*[name()=$ID_ATTR and
string(number(.))!='NaN']"/>
</xsl:call-template>
</xsl:variable>
<xsl:variable name="maxid">
<xsl:choose>
<xsl:when test="(string(number($max_id_stored))='NaN' or
number($max_id_stored) <= number($max)) and number($max) >= 0">
<xsl:value-of select="number($max) + 1"/>
</xsl:when>
<xsl:when test="string(number($max_id_stored)) != 'NaN'">
<xsl:value-of select="$max_id_stored"/>
</xsl:when>
<xsl:otherwise>0</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="nrOfElementsWithoutId"
select="count(//*[name()=$CONTAINER_EL and (@*[name()=$ID_ATTR]='' or
count(@*[name()=$ID_ATTR])=0)])"/>
<xsl:variable name="new_max_id"
select="number($nrOfElementsWithoutId)+number($maxid)"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*[name()=$CONTAINER_EL]" priority="9">
<xsl:copy>
<xsl:attribute name="{$ID_ATTR}">
<xsl:choose>
<xsl:when test="number(@*[name()=$ID_ATTR]) >= 0 or
string-length(@*[name()=$ID_ATTR]) > 0">
<xsl:value-of select="@*[name()=$ID_ATTR]"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="emptyPrecedingIds">
<xsl:number level="any" count="*[name()=$CONTAINER_EL and
(@*[name()=$ID_ATTR]='' or count(@*[name()=$ID_ATTR])=0)]"/>
</xsl:variable>
<xsl:number value="number($maxid)+number($emptyPrecedingIds)-1"
format="1"/>
</xsl:otherwise>
</xsl:choose>
</xsl:attribute>
<xsl:apply-templates select="@*[name()!=$ID_ATTR]|node()"/>
</xsl:copy>
</xsl:template>
This code reuses id's.
What i also notices is that <xsl:variable name="max_id_stored"
select="/nodes/@maxid"/> is not updated with the new maxid after a save. Only
after i close en open the document again. This is one of the reason it can
reuses ids of those elements that are deleted. How come max_id_stored is not
changed after a save? Any help?
THanks in advance,
Amon
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