From 33036a1e6428d09d3ce35a820c983bf25107a136 Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Mon, 23 Feb 2004 12:42:04 +0000
Subject: [PATCH] kind=dc implemented.

---
 helm/DEVEL/rdfly/rdfly.ml | 52 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/helm/DEVEL/rdfly/rdfly.ml b/helm/DEVEL/rdfly/rdfly.ml
index bb734a62b..724d8f8bd 100644
--- a/helm/DEVEL/rdfly/rdfly.ml
+++ b/helm/DEVEL/rdfly/rdfly.ml
@@ -33,6 +33,15 @@ let msg_output_header msg obj =
 let msg_output_trailer msg =
   msg_output_string msg "  </h:Object>\n</rdf:RDF>\n"
 
+let msg_output_dc_header msg obj =
+  msg_output_string msg "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n\n" ;
+  msg_output_string msg ("<rdf:RDF xml:lang=\"en\"\n         xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n         xmlns:rdfs=\"http://www.w3.org/2000/01/rdf-schema#\"\n         xmlns:dc=\"http://purl.org/metadata/dublin_core#\"\n         xmlns:dcq=\"http://purl.org/metadata/dublin_core_qualifiers#\"\n         xmlns:h=\"http:/www.cs.unibo.it/helm/schemas/schema-h.rdf#\"\n         xmlns:hth=\"http://www.cs.unibo.it/helm/schemas/schema-hth.rdf#\">\n")
+;;
+
+let msg_output_dc_trailer msg =
+  msg_output_string msg "  </h:DirectoryOfObjects>\n</rdf:RDF>"
+;;
+
 let value_of_optional_value =
  function
     None -> assert false
@@ -54,6 +63,7 @@ let forward_metadata db obj =
    ) ;
   msg_output_trailer msg ;
   msg_serialize msg
+;;
 
 let backward_metadata db obj =
   let res = M.exec db ("SELECT * FROM refObj WHERE h_occurrence = '" ^ obj ^ "';") in
@@ -70,6 +80,47 @@ let backward_metadata db obj =
    ) ;
   msg_output_trailer msg ;
   msg_serialize msg
+;;
+
+let dc_metadata db obj =
+ let tables =
+  [ "dc:creator","dccreator" ;
+    "dc:date","dcdate" ;
+    "dc:description","dcdescription" ;
+    "dc:format","dcformat" ;
+    "dc:identifier","dcidentifier" ;
+    "dc:language","dclanguage" ;
+    "dc:publisher","dcpublisher" ;
+    "dcq:RelationType","dcqRelationType" ;
+    "dc:relation","dcrelation" ;
+    "dc:rights","dcrights" ;
+    "dc:source","dcsource" ;
+    "dc:subject","dcsubject" ;
+    "dc:title","dctitle" ;
+    "hth:ResourceFormat","hthResourceFormat" ;
+    "hth:contact","hthcontact" ;
+    "hth:firstVersion","hthfirstVersion" ;
+    "hth:institution","hthinstitution" ;
+    "hth:modified","hthmodified"
+ ]
+ in
+  let msg = mk_new_msg () in
+  msg_output_dc_header msg obj ;
+  List.iter
+   (fun (propertyname,tablename) -> 
+     let res =
+      M.exec db
+       ("SELECT * FROM " ^ tablename ^ " WHERE uri = '" ^ obj ^ "';") in
+     M.iter res
+      ~f:(function cols ->
+        let value = value_of_optional_value (cols.(0)) in
+        msg_output_string msg
+         ("    <" ^ propertyname ^ ">" ^ value ^ "</" ^ propertyname ^ ">\n") ;
+      ) ;
+   ) tables ;
+   msg_output_dc_trailer msg ;
+   msg_serialize msg
+;;
 
 let debug_print s = prerr_endline ("[RDFly] " ^ s)
 
@@ -114,6 +165,7 @@ let callback (req: Http_types.request) ch =
         match kind with
           "forward" -> return_xml (forward_metadata db obj) ch
         | "backward" -> return_xml (backward_metadata db obj) ch
+        | "dc" -> return_xml (dc_metadata db obj) ch
         | s -> return_html_error ("unsupported kind: " ^ s) ch
       end ;
       M.disconnect db
-- 
2.39.2