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dbutils.xqm
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Tue, Sep 17, 08:04

dbutils.xqm
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xquery version "3.0";
module namespace dbutil="http://exist-db.org/xquery/dbutil";
import module namespace sm="http://exist-db.org/xquery/securitymanager";
import module namespace xmldb="http://exist-db.org/xquery/xmldb";
(:~ Scan a collection tree recursively starting at $root. Call $func once for each collection found :)
declare function dbutil:scan-collections($root as xs:anyURI, $func as function(xs:anyURI) as item()*) {
$func($root),
if (sm:has-access($root, "rx")) then
for $child in xmldb:get-child-collections($root)
return
dbutil:scan-collections(xs:anyURI($root || "/" || $child), $func)
else
()
};
(:~
: List all resources contained in a collection and call the supplied function once for each
: resource with the complete path to the resource as parameter.
:)
declare function dbutil:scan-resources($collection as xs:anyURI, $func as function(xs:anyURI) as item()*) {
if (sm:has-access($collection, "rx")) then
for $child in xmldb:get-child-resources($collection)
return
$func(xs:anyURI($collection || "/" || $child))
else
()
};
(:~
: Scan a collection tree recursively starting at $root. Call the supplied function once for each
: resource encountered. The first parameter to $func is the collection URI, the second the resource
: path (including the collection part).
:)
declare function dbutil:scan($root as xs:anyURI, $func as function(xs:anyURI, xs:anyURI?) as item()*) {
dbutil:scan-collections($root, function($collection as xs:anyURI) {
$func($collection, ()),
(: scan-resources expects a function with one parameter, so we use a partial application
to fill in the collection parameter :)
dbutil:scan-resources($collection, $func($collection, ?))
})
};
declare function dbutil:find-by-mimetype($collection as xs:anyURI, $mimeType as xs:string+) {
dbutil:scan($collection, function($collection, $resource) {
if (exists($resource) and xmldb:get-mime-type($resource) = $mimeType) then
$resource
else
()
})
};
declare function dbutil:find-by-mimetype($collection as xs:anyURI, $mimeType as xs:string+, $func as function(xs:anyURI) as item()*) {
dbutil:scan($collection, function($collection, $resource) {
if (exists($resource) and xmldb:get-mime-type($resource) = $mimeType) then
$func($resource)
else
()
})
};

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