X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=lib%2FZOOM%2FIRSpy%2FUtils.pm;h=e24fd6ca569c6478f602f7c74aa98bb87e4c98f8;hb=7e30dd5f86e43b3e2f19b33d713d413168c7fd6b;hp=cbdb5c8a4ab4edc229b4fc91148b20433a59c44e;hpb=e9810bfbcdbfadbeb838cbe71a6fa52375232d6a;p=irspy-moved-to-github.git

diff --git a/lib/ZOOM/IRSpy/Utils.pm b/lib/ZOOM/IRSpy/Utils.pm
index cbdb5c8..e24fd6c 100644
--- a/lib/ZOOM/IRSpy/Utils.pm
+++ b/lib/ZOOM/IRSpy/Utils.pm
@@ -1,4 +1,4 @@
-# $Id: Utils.pm,v 1.24 2007-03-01 13:59:45 mike Exp $
+# $Id: Utils.pm,v 1.27 2007-04-27 14:04:40 mike Exp $
 
 package ZOOM::IRSpy::Utils;
 
@@ -12,8 +12,12 @@ our @EXPORT_OK = qw(isodate
 		    cql_quote
 		    cql_target
 		    irspy_xpath_context
+		    irspy_make_identifier
+		    irspy_record2identifier
+		    irspy_identifier2target
 		    modify_xml_document
-		    bib1_access_point);
+		    bib1_access_point
+		    render_record);
 
 use XML::LibXML;
 use XML::LibXML::XPathContext;
@@ -72,11 +76,19 @@ sub cql_quote {
 }
 
 
-# Makes a CQL query that finds a specified target
+# Makes a CQL query that finds a specified target.  Arguments may be
+# either an ID alone, or a (host, port, db) triple.
 sub cql_target {
-    my($host, $port, $db) = @_;
+    my($protocol, $host, $port, $db) = @_;
 
-    return "rec.id=" . cql_quote("$host:$port/$db");
+    my $id;
+    if (defined $host) {
+	$id = irspy_make_identifier($protocol, $host, $port, $db);
+    } else {
+	$id = $protocol;
+    }
+
+    return "rec.id=" . cql_quote($id);
 }
 
 
@@ -103,10 +115,19 @@ sub irspy_namespace {
 sub irspy_xpath_context {
     my($record) = @_;
 
-    my $xml = ref $record ? $record->render() : $record;
-    my $parser = new XML::LibXML();
-    my $doc = $parser->parse_string($xml);
-    my $root = $doc->getDocumentElement();
+    if (ref $record && $record->isa("ZOOM::Record")) {
+	$record = $record->render();
+    }
+
+    my $root;
+    if (ref $record) {
+	$root = $record;
+    } else {
+	my $parser = new XML::LibXML();
+	my $doc = $parser->parse_string($record);
+	$root = $doc->getDocumentElement();
+    }
+
     my $xc = XML::LibXML::XPathContext->new($root);
     foreach my $prefix (keys %_namespaces) {
 	$xc->registerNs($prefix, $_namespaces{$prefix});
@@ -115,6 +136,60 @@ sub irspy_xpath_context {
 }
 
 
+# Construct an opaque identifier from its components.  Although it's
+# trivial, this is needed in so many places that it really needs to be
+# factored out.
+#
+# This is the converse of _parse_target_string() in IRSpy.pm, which
+# should be renamed and moved into this package.
+#
+sub irspy_make_identifier {
+    my($protocol, $host, $port, $dbname) = @_;
+
+    die "irspy_make_identifier(" . join(", ", map { "'$_'" } @_).
+	"): wrong number of arguments" if @_ != 4;
+
+    die "irspy_make_identifier(): protocol undefined" if !defined $protocol;
+    die "irspy_make_identifier(): host undefined" if !defined $host;
+    die "irspy_make_identifier(): port undefined" if !defined $port;
+    die "irspy_make_identifier(): dbname undefined" if !defined $dbname;
+
+    return "$protocol:$host:$port/$dbname";
+}
+
+
+# Returns the opaque identifier of an IRSpy record based on the
+# XPathContext'ed DOM object, as returned by irspy_xpath_context().
+# This is doing the same thing as irspy_make_identifier() but from a
+# record rather than a set of parameters.
+#
+sub irspy_record2identifier {
+    my($xc) = @_;
+
+    ### Must be kept the same as is used in ../../../zebra/*.xsl
+    return $xc->find("concat(e:serverInfo/\@protocol, ':',
+			     e:serverInfo/e:host, ':',
+			     e:serverInfo/e:port, '/',
+			     e:serverInfo/e:database)");
+}
+
+
+# Transforms an IRSpy opqaue identifier, as returned from
+# irspy_make_identifier() or irspy_record2identifier(), into a YAZ
+# target-string suitable for feeding to ZOOM.  Before we introduced
+# the protocol element at the start of the identifier string, this was
+# a null transform; now we have to be a bit cleverer.
+#
+sub irspy_identifier2target {
+    my($id) = @_;
+
+    my($protocol, $target) = ($id =~ /(.*?):(.*)/);
+    print STDERR "protocol='$protocol', target='$target'\n";
+    ### This assumes everything is Z39.50
+    return $target;
+}
+
+
 sub modify_xml_document {
     my($xc, $fieldsByKey, $data) = @_;
 
@@ -590,4 +665,18 @@ sub bib1_access_point {
 }
 
 
+sub render_record {
+    my($rs, $which, $elementSetName) = @_;
+
+    # There is a slight race condition here on the element-set name,
+    # but it shouldn't be a problem as this is (currently) only called
+    # from parts of the program that run single-threaded.
+    my $old = $rs->option(elementSetName => $elementSetName);
+    my $rec = $rs->record($which);
+    $rs->option(elementSetName => $old);
+
+    return $rec->render();
+}
+
+
 1;