So, it turns out to be pretty simple when you know what you're doing:
1) Add confman namespace and "confman" to exclude-result-prefixes.
<xsl:stylesheet
...
xmlns:confman="org.dspace.core.ConfigurationManager"
exclude-result-prefixes="... confman">
2) Add this simple template to process Solr result. More complex date
formatting can be done easily in XSLT 2.0
<http://www.w3.org/TR/xslt20/#format-date>, however Cocoon still uses
XSLT 1.0. It is currently also possible to call Java functions to do
date formatting.
<xsl:template match="/response/result/doc/date" mode="lastItem">
Last item was imported: <xsl:value-of
select="substring(text(), 1, 10)"/>
</xsl:template>
3) Add the following code to the place where you want the resulting
text to appear:
<xsl:variable name="solr-search-url"
select="confman:getProperty('discovery', 'search.server')"/>
<xsl:apply-templates select="document(concat($solr-search-url,
'/select?q=search.resourcetype:2&sort=dc.date.accessioned_dt%20desc&rows=1&fl=dc.date.accessioned_dt&omitHeader=true'))"
mode="lastItem"/>
For example, to add it after the list of Recent items in Mirage,
override its template like this:
<xsl:template match="dri:referenceSet[@type = 'summaryList' and
@n='site-last-submitted']" priority="2">
<xsl:apply-templates select="dri:head"/>
<!-- Here we decide whether we have a hierarchical list or a
flat one -->
<xsl:choose>
<xsl:when
test="descendant-or-self::dri:referenceSet/@rend='hierarchy' or
ancestor::dri:referenceSet/@rend='hierarchy'">
<ul>
<xsl:apply-templates
select="*[not(name()='head')]" mode="summaryList"/>
</ul>
</xsl:when>
<xsl:otherwise>
<ul class="ds-artifact-list">
<xsl:apply-templates
select="*[not(name()='head')]" mode="summaryList"/>
</ul>
</xsl:otherwise>
</xsl:choose>
<xsl:variable name="solr-search-url"
select="confman:getProperty('discovery', 'search.server')"/>
<xsl:apply-templates select="document(concat($solr-search-url,
'/select?q=search.resourcetype:2&sort=dc.date.accessioned_dt%20desc&rows=1&fl=dc.date.accessioned_dt&omitHeader=true'))"
mode="lastItem"/>
</xsl:template>
Just remember that this requires Discovery. I tested it in DSpace 1.8,
it may work in 1.7, too.
While experimenting with this I also prepared a short DSpace Solr
tutorial with examples. Hopefully, the page should appear here later
today (someone has to create it for me first, I don't have the right):
https://wiki.duraspace.org/display/DSPACE/Solr
Regards,
~~helix84
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