From ff69b79f1a2ba5e82c925332b2fdfdf8dc33d836 Mon Sep 17 00:00:00 2001
From: Jason Stephenson <jason@sigio.com>
Date: Tue, 16 Nov 2021 18:32:34 -0500
Subject: [PATCH] Add authority.generate_overlay_template to DB upgrade script

---
 ...unctions.lp1937294-support-newer-postgresql.sql | 89 ++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/Open-ILS/src/sql/Pg/upgrade/XXXX.functions.lp1937294-support-newer-postgresql.sql b/Open-ILS/src/sql/Pg/upgrade/XXXX.functions.lp1937294-support-newer-postgresql.sql
index 885764f252..c82900ad89 100644
--- a/Open-ILS/src/sql/Pg/upgrade/XXXX.functions.lp1937294-support-newer-postgresql.sql
+++ b/Open-ILS/src/sql/Pg/upgrade/XXXX.functions.lp1937294-support-newer-postgresql.sql
@@ -473,4 +473,93 @@ BEGIN
 END;
 $$ LANGUAGE PLPGSQL;
 
+CREATE OR REPLACE FUNCTION authority.generate_overlay_template (source_xml TEXT) RETURNS TEXT AS $f$
+DECLARE
+    cset                INT;
+    main_entry          authority.control_set_authority_field%ROWTYPE;
+    bib_field           authority.control_set_bib_field%ROWTYPE;
+    auth_id             INT DEFAULT oils_xpath_string('//*[@tag="901"]/*[local-name()="subfield" and @code="c"]', source_xml)::INT;
+    tmp_data            XML;
+    replace_data        XML[] DEFAULT '{}'::XML[];
+    replace_rules       TEXT[] DEFAULT '{}'::TEXT[];
+    auth_field          XML[];
+    auth_i1             TEXT;
+    auth_i2             TEXT;
+BEGIN
+    IF auth_id IS NULL THEN
+        RETURN NULL;
+    END IF;
+
+    -- Default to the LoC controll set
+    SELECT control_set INTO cset FROM authority.record_entry WHERE id = auth_id;
+
+    -- if none, make a best guess
+    IF cset IS NULL THEN
+        SELECT  control_set INTO cset
+          FROM  authority.control_set_authority_field
+          WHERE tag IN (
+                    SELECT  UNNEST(XPATH('//*[starts-with(@tag,"1")]/@tag',marc::XML)::TEXT[])
+                      FROM  authority.record_entry
+                      WHERE id = auth_id
+                )
+          LIMIT 1;
+    END IF;
+
+    -- if STILL none, no-op change
+    IF cset IS NULL THEN
+        RETURN XMLELEMENT(
+            name record,
+            XMLATTRIBUTES('http://www.loc.gov/MARC21/slim' AS xmlns),
+            XMLELEMENT( name leader, '00881nam a2200193   4500'),
+            XMLELEMENT(
+                name datafield,
+                XMLATTRIBUTES( '905' AS tag, ' ' AS ind1, ' ' AS ind2),
+                XMLELEMENT(
+                    name subfield,
+                    XMLATTRIBUTES('d' AS code),
+                    '901c'
+                )
+            )
+        )::TEXT;
+    END IF;
+
+    FOR main_entry IN SELECT * FROM authority.control_set_authority_field acsaf WHERE acsaf.control_set = cset AND acsaf.main_entry IS NULL LOOP
+        auth_field := XPATH('//*[@tag="'||main_entry.tag||'"][1]',source_xml::XML);
+        auth_i1 = (XPATH('//*[@ind1]',auth_field[1]))[1];
+        auth_i2 = (XPATH('//*[@ind2]',auth_field[1]))[1];
+        IF ARRAY_LENGTH(auth_field,1) > 0 THEN
+            FOR bib_field IN SELECT * FROM authority.control_set_bib_field WHERE authority_field = main_entry.id LOOP
+                SELECT XMLELEMENT( -- XMLAGG avoids magical <element> creation, but requires unnest subquery
+                    name datafield,
+                    XMLATTRIBUTES(bib_field.tag AS tag, auth_i1 AS ind1, auth_i2 AS ind2),
+                    XMLAGG(UNNEST)
+                ) INTO tmp_data FROM UNNEST(XPATH('//*[local-name()="subfield"]', auth_field[1]));
+                replace_data := replace_data || tmp_data;
+                replace_rules := replace_rules || ( bib_field.tag || main_entry.sf_list || E'[0~\\)' || auth_id || '$]' );
+                tmp_data = NULL;
+            END LOOP;
+            EXIT;
+        END IF;
+    END LOOP;
+
+    SELECT XMLAGG(UNNEST) INTO tmp_data FROM UNNEST(replace_data);
+
+    RETURN XMLELEMENT(
+        name record,
+        XMLATTRIBUTES('http://www.loc.gov/MARC21/slim' AS xmlns),
+        XMLELEMENT( name leader, '00881nam a2200193   4500'),
+        tmp_data,
+        XMLELEMENT(
+            name datafield,
+            XMLATTRIBUTES( '905' AS tag, ' ' AS ind1, ' ' AS ind2),
+            XMLELEMENT(
+                name subfield,
+                XMLATTRIBUTES('r' AS code),
+                ARRAY_TO_STRING(replace_rules,',')
+            )
+        )
+    )::TEXT;
+END;
+$f$ STABLE LANGUAGE PLPGSQL;
+
 COMMIT;
-- 
2.11.0