From b462579455546641011653a43546c4055389bf5e Mon Sep 17 00:00:00 2001
From: miker <miker@dcc99617-32d9-48b4-a31d-7c20da2025e4>
Date: Wed, 13 Apr 2011 15:34:24 +0000
Subject: [PATCH] strip useless whitespace from XML output for transfer size reduction

git-svn-id: svn://svn.open-ils.org/ILS/trunk@20065 dcc99617-32d9-48b4-a31d-7c20da2025e4
---
 Open-ILS/src/sql/Pg/002.schema.config.sql          |    2 +-
 Open-ILS/src/sql/Pg/990.schema.unapi.sql           |    1 +
 .../0514.schema.unapi2-strip-whitespace.sql        |   99 ++++++++++++++++++++
 3 files changed, 101 insertions(+), 1 deletions(-)
 create mode 100644 Open-ILS/src/sql/Pg/upgrade/0514.schema.unapi2-strip-whitespace.sql

diff --git a/Open-ILS/src/sql/Pg/002.schema.config.sql b/Open-ILS/src/sql/Pg/002.schema.config.sql
index 306c58b..a76a0b0 100644
--- a/Open-ILS/src/sql/Pg/002.schema.config.sql
+++ b/Open-ILS/src/sql/Pg/002.schema.config.sql
@@ -70,7 +70,7 @@ CREATE TABLE config.upgrade_log (
     install_date    TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
 );
 
-INSERT INTO config.upgrade_log (version) VALUES ('0513'); -- miker
+INSERT INTO config.upgrade_log (version) VALUES ('0514'); -- miker
 
 CREATE TABLE config.bib_source (
 	id		SERIAL	PRIMARY KEY,
diff --git a/Open-ILS/src/sql/Pg/990.schema.unapi.sql b/Open-ILS/src/sql/Pg/990.schema.unapi.sql
index d0e11c2..4cfa20c 100644
--- a/Open-ILS/src/sql/Pg/990.schema.unapi.sql
+++ b/Open-ILS/src/sql/Pg/990.schema.unapi.sql
@@ -222,6 +222,7 @@ BEGIN
         output := tmp_xml;
     END IF;
 
+    output := REGEXP_REPLACE(output::TEXT,E'>\\s+<','><','gs')::XML;
     RETURN output;
 END;
 $F$ LANGUAGE PLPGSQL;
diff --git a/Open-ILS/src/sql/Pg/upgrade/0514.schema.unapi2-strip-whitespace.sql b/Open-ILS/src/sql/Pg/upgrade/0514.schema.unapi2-strip-whitespace.sql
new file mode 100644
index 0000000..65681ae
--- /dev/null
+++ b/Open-ILS/src/sql/Pg/upgrade/0514.schema.unapi2-strip-whitespace.sql
@@ -0,0 +1,99 @@
+BEGIN;
+
+INSERT INTO config.upgrade_log (version) VALUES ('0514'); -- miker
+
+CREATE OR REPLACE FUNCTION unapi.bre ( obj_id BIGINT, format TEXT,  ename TEXT, includes TEXT[], org TEXT, depth INT DEFAULT NULL, slimit INT DEFAULT NULL, soffset INT DEFAULT NULL, include_xmlns BOOL DEFAULT TRUE ) RETURNS XML AS $F$
+DECLARE
+    me      biblio.record_entry%ROWTYPE;
+    layout  unapi.bre_output_layout%ROWTYPE;
+    xfrm    config.xml_transform%ROWTYPE;
+    ouid    INT;
+    tmp_xml TEXT;
+    top_el  TEXT;
+    output  XML;
+    hxml    XML;
+    axml    XML;
+BEGIN
+
+    SELECT id INTO ouid FROM actor.org_unit WHERE shortname = org;
+
+    IF ouid IS NULL THEN
+        RETURN NULL::XML;
+    END IF;
+
+    IF format = 'holdings_xml' THEN -- the special case
+        output := unapi.holdings_xml( obj_id, ouid, org, depth, includes, slimit, soffset, include_xmlns);
+        RETURN output;
+    END IF;
+
+    SELECT * INTO layout FROM unapi.bre_output_layout WHERE name = format;
+
+    IF layout.name IS NULL THEN
+        RETURN NULL::XML;
+    END IF;
+
+    SELECT * INTO xfrm FROM config.xml_transform WHERE name = layout.transform;
+
+    SELECT * INTO me FROM biblio.record_entry WHERE id = obj_id;
+
+    -- grab SVF if we need them
+    IF ('mra' = ANY (includes)) THEN
+        axml := unapi.mra(obj_id,NULL,NULL,NULL,NULL);
+    ELSE
+        axml := NULL::XML;
+    END IF;
+
+    -- grab hodlings if we need them
+    IF ('holdings_xml' = ANY (includes)) THEN
+        hxml := unapi.holdings_xml(obj_id, ouid, org, depth, evergreen.array_remove_item_by_value(includes,'holdings_xml'), slimit, soffset, include_xmlns);
+    ELSE
+        hxml := NULL::XML;
+    END IF;
+
+
+    -- generate our item node
+
+
+    IF format = 'marcxml' THEN
+        tmp_xml := me.marc;
+        IF tmp_xml !~ E'<marc:' THEN -- If we're not using the prefixed namespace in this record, then remove all declarations of it
+           tmp_xml := REGEXP_REPLACE(tmp_xml, ' xmlns:marc="http://www.loc.gov/MARC21/slim"', '', 'g');
+        END IF;
+    ELSE
+        tmp_xml := oils_xslt_process(me.marc, xfrm.xslt)::XML;
+    END IF;
+
+    top_el := REGEXP_REPLACE(tmp_xml, E'^.*?<((?:\\S+:)?' || layout.holdings_element || ').*$', E'\\1');
+
+    IF axml IS NOT NULL THEN
+        tmp_xml := REGEXP_REPLACE(tmp_xml, '</' || top_el || '>(.*?)$', axml || '</' || top_el || E'>\\1');
+    END IF;
+
+    IF hxml IS NOT NULL THEN -- XXX how do we configure the holdings position?
+        tmp_xml := REGEXP_REPLACE(tmp_xml, '</' || top_el || '>(.*?)$', hxml || '</' || top_el || E'>\\1');
+    END IF;
+
+    IF ('bre.unapi' = ANY (includes)) THEN
+        output := REGEXP_REPLACE(
+            tmp_xml,
+            '</' || top_el || '>(.*?)',
+            XMLELEMENT(
+                name abbr,
+                XMLATTRIBUTES(
+                    'http://www.w3.org/1999/xhtml' AS xmlns,
+                    'unapi-id' AS class,
+                    'tag:open-ils.org:U2@bre/' || obj_id || '/' || org AS title
+                )
+            )::TEXT || '</' || top_el || E'>\\1'
+        );
+    ELSE
+        output := tmp_xml;
+    END IF;
+
+    output := REGEXP_REPLACE(output::TEXT,E'>\\s+<','><','gs')::XML;
+    RETURN output;
+END;
+$F$ LANGUAGE PLPGSQL;
+
+COMMIT;
+
-- 
1.7.2.5