Port node db saving and RDF export to xml writer api.

2003-11-08  Christian Persch  <chpe@cvs.gnome.org>

	* embed/ephy-favicon-cache.c: (ephy_favicon_cache_get_type),
	(ephy_favicon_cache_finalize):
	* embed/ephy-history.c: (ephy_history_save):
	* lib/ephy-file-helpers.c: (ephy_file_switch_temp_file):
	* lib/ephy-file-helpers.h:
	* lib/ephy-node-db.c: (ephy_node_db_load_from_file),
	(ephy_node_db_write_to_xml_valist),
	(ephy_node_db_write_to_xml_safe):
	* lib/ephy-node-db.h:
	* lib/ephy-node.c: (write_parent), (ephy_node_write_to_xml):
	* lib/ephy-node.h:
	* lib/ephy-state.c: (ephy_states_save), (ensure_states):
	* src/bookmarks/ephy-bookmarks-export.c: (write_topics_list),
	(ephy_bookmarks_export_rdf):
	* src/bookmarks/ephy-bookmarks.c: (ephy_bookmarks_save):

	Port node db saving and RDF export to xml writer api.

1 files changed, 163 insertions, 57 deletions

diff --git a/src/bookmarks/ephy-bookmarks-export.c b/src/bookmarks/ephy-bookmarks-export.c
index be9b97ea7..b0ac4bc56 100644
--- a/src/bookmarks/ephy-bookmarks-export.c
+++ b/src/bookmarks/ephy-bookmarks-export.c
@@ -1,5 +1,6 @@
 /*
  *  Copyright (C) 2003 Marco Pesenti Gritti
+ *  Copyright (C) 2003 Christian Persch
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -14,24 +15,29 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ *  $Id$
  */
 
-#include <libxml/tree.h>
-#include <libgnomevfs/gnome-vfs-uri.h>
-#include <libgnomevfs/gnome-vfs-utils.h>
-
 #include "ephy-bookmarks-export.h"
 #include "ephy-node-common.h"
 #include "ephy-file-helpers.h"
 #include "ephy-debug.h"
 
-static void
-add_topics_list (EphyNode *topics, EphyNode *bmk,
-		 xmlNodePtr parent, xmlNsPtr dc_ns)
+#include <libxml/tree.h>
+#include <libxml/xmlwriter.h>
+#include <libgnomevfs/gnome-vfs-uri.h>
+#include <libgnomevfs/gnome-vfs-utils.h>
+
+static int
+write_topics_list (EphyNode *topics,
+		   EphyNode *bmk,
+		   xmlTextWriterPtr writer)
 {
 	GPtrArray *children;
+	GList *keywords = NULL, *l;
 	int i;
-	GList *bmks = NULL, *l;
+	int ret = 0;
 
 	children = ephy_node_get_children (topics);
 	for (i = 0; i < children->len; i++)
@@ -47,26 +53,27 @@ add_topics_list (EphyNode *topics, EphyNode *bmk,
 		if (priority == EPHY_NODE_NORMAL_PRIORITY &&
 		    ephy_node_has_child (kid, bmk))
 		{
-			bmks = g_list_append (bmks, kid);
+			keywords = g_list_prepend (keywords, kid);
 		}
 	}
 	ephy_node_thaw (topics);
 
-	if (bmks == NULL) return;
-
-	for (l = bmks; l != NULL; l = l->next)
+	for (l = keywords; l != NULL; l = l->next)
 	{
-		const char *name;
 		EphyNode *node = l->data;
-		xmlNodePtr item_node;
+		const char *name;
 
 		name = ephy_node_get_property_string
 			(node, EPHY_NODE_KEYWORD_PROP_NAME);
-		item_node = xmlNewChild (parent, dc_ns, "subject", NULL);
-		xmlNodeSetContent (item_node, name);
+
+		ret = xmlTextWriterWriteElementNS
+			(writer, "dc", "subject", NULL, name);
+		if (ret < 0) break;
 	}
 
-	g_list_free (bmks);
+	g_list_free (keywords);
+
+	return ret >= 0 ? 0 : -1;
 }
 
 void
@@ -74,50 +81,128 @@ ephy_bookmarks_export_rdf (EphyBookmarks *bookmarks,
 			   const char *filename)
 {
 	EphyNode *bmks, *topics, *smart_bmks;
-	xmlDocPtr doc;
-	xmlNodePtr root, xml_node, channel_node, channel_seq_node;
-	xmlNsPtr ephy_ns, rdf_ns, dc_ns;
+	xmlTextWriterPtr writer;
+	char *tmp_file;
 	GPtrArray *children;
 	char *file_uri;
-	int i;
+	int i, ret;
+
+	LOG ("Exporting as RDF to %s", filename)
+
+	START_PROFILER ("Exporting as RDF")
+
+	tmp_file = g_strconcat (filename, ".tmp", NULL);
+
+	/* FIXME: do we want to turn on compression here? */
+	writer = xmlNewTextWriterFilename (tmp_file, 0);
+	if (writer == NULL) return;
 
-	LOG ("Exporting to rdf")
+	ret = xmlTextWriterStartDocument (writer, "1.0", NULL, NULL);
+	if (ret < 0) goto out;
 
-	xmlIndentTreeOutput = TRUE;
-	doc = xmlNewDoc ("1.0");
+	ret = xmlTextWriterStartElementNS
+		(writer, "rdf", "RDF", "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
+	if (ret < 0) goto out;
 
-	root = xmlNewDocNode (doc, NULL, "rdf:RDF", NULL);
-	xmlDocSetRootElement (doc, root);
-	rdf_ns = xmlNewNs (root, "http://www.w3.org/1999/02/22-rdf-syntax-ns#", "rdf");
-	xmlNewNs (root, "http://purl.org/rss/1.0/", NULL);
-	dc_ns = xmlNewNs (root, "http://purl.org/dc/elements/1.1/", "dc");
-	ephy_ns = xmlNewNs (root, "http://gnome.org/ns/epiphany#", "ephy");
-	channel_node = xmlNewChild (root, NULL, "channel", NULL);
+	ret = xmlTextWriterWriteAttribute (writer, "xmlns", "http://purl.org/rss/1.0/");
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterWriteAttributeNS
+		(writer, "xmlns", "dc", NULL, "http://purl.org/dc/elements/1.1/");
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterWriteAttributeNS
+		(writer, "xmlns", "ephy", NULL, "http://gnome.org/ns/epiphany#");
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterStartElement (writer, "channel");
+	if (ret < 0) goto out;
+
+	/* FIXME is this UTF-8 ? */
 	file_uri = gnome_vfs_get_uri_from_local_path (filename);
-	xmlSetProp (channel_node, "rdf:about", file_uri);
+	ret = xmlTextWriterWriteAttributeNS (writer, "rdf", "about", NULL, file_uri);
 	g_free (file_uri);
+	if (ret < 0) goto out;
 
-	xml_node = xmlNewChild (channel_node, NULL, "title", NULL);
-	xmlNodeSetContent (xml_node, "Epiphany bookmarks");
+	ret = xmlTextWriterWriteElement (writer, "title", "Epiphany bookmarks");
+	if (ret < 0) goto out;
 
-	xml_node = xmlNewChild (channel_node, NULL, "link", NULL);
-	xmlNodeSetContent (xml_node, "http://epiphany.mozdev.org");
+	ret = xmlTextWriterWriteElement
+		(writer, "link", "http://www.gnome.org/projects/epiphany/");
+	if (ret < 0) goto out;
 
-	xml_node = xmlNewChild (channel_node, NULL, "items", NULL);
+	ret = xmlTextWriterStartElement (writer, "items");
+	if (ret < 0) goto out;
 
-	channel_seq_node = xmlNewChild (xml_node, rdf_ns, "Seq", NULL);
+	ret = xmlTextWriterStartElementNS (writer, "rdf", "Seq", NULL);
+	if (ret < 0) goto out;
 
 	bmks = ephy_bookmarks_get_bookmarks (bookmarks);
 	topics = ephy_bookmarks_get_keywords (bookmarks);
 	smart_bmks = ephy_bookmarks_get_smart_bookmarks (bookmarks);
 
 	children = ephy_node_get_children (bmks);
-	for (i = 0; i < children->len; i++)
+	for (i=0; i < children->len; i++)
+	{
+		EphyNode *kid;
+		const char *url;
+		char *link = NULL;
+		gboolean smart_url;
+
+		kid = g_ptr_array_index (children, i);
+
+		smart_url = ephy_node_has_child (smart_bmks, kid);
+		url = ephy_node_get_property_string
+			(kid, EPHY_NODE_BMK_PROP_LOCATION);
+		if (smart_url)
+		{
+			GnomeVFSURI *uri;
+
+			uri = gnome_vfs_uri_new (url);
+
+			if (uri)
+			{
+				link = g_strconcat (gnome_vfs_uri_get_scheme (uri),
+						    "://",
+						    gnome_vfs_uri_get_host_name (uri),
+						    NULL);
+
+				gnome_vfs_uri_unref (uri);
+			}
+		}
+
+		if (link == NULL)
+		{
+			link = g_strdup (url);
+		}
+
+		ret = xmlTextWriterStartElementNS (writer, "rdf", "li", NULL);
+		if (ret < 0) break;
+
+		ret = xmlTextWriterWriteAttributeNS
+			(writer, "rdf", "about", NULL, link);
+		if (ret < 0) break;
+
+		ret = xmlTextWriterEndElement (writer); /* rdf:li */
+		if (ret < 0) break;
+	}
+	ephy_node_thaw (bmks);
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterEndElement (writer); /* rdf:Seq */
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterEndElement (writer); /* items */
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterEndElement (writer); /* channel */
+	if (ret < 0) goto out;
+	
+	children = ephy_node_get_children (bmks);
+	for (i=0; i < children->len; i++)
 	{
 		EphyNode *kid;
 		const char *url, *title;
-		xmlNodePtr item_node;
-		xmlChar *encoded_link;
 		char *link = NULL;
 		gboolean smart_url;
 
@@ -151,33 +236,54 @@ ephy_bookmarks_export_rdf (EphyBookmarks *bookmarks,
 			link = g_strdup (url);
 		}
 
-		encoded_link = xmlEncodeEntitiesReentrant (doc, link);
-
-		item_node = xmlNewChild (channel_seq_node, rdf_ns, "li", NULL);
-		xmlSetNsProp (item_node, rdf_ns, "about", link);
+		ret = xmlTextWriterStartElement (writer, "item");
+		if (ret < 0) break;
 
-		item_node = xmlNewChild (root, NULL, "item", NULL);
-		xmlSetNsProp (item_node, rdf_ns, "about", link);
+		ret = xmlTextWriterWriteAttributeNS
+			(writer, "rdf", "about", NULL, link);
+		if (ret < 0) break;
 
-		xml_node = xmlNewChild (item_node, NULL, "title", title);
+		ret = xmlTextWriterWriteElement (writer, "title", title);
+		if (ret < 0) break;
 
-		xml_node = xmlNewChild (item_node, NULL, "link", encoded_link);
+		ret = xmlTextWriterWriteElement (writer, "link", link);
+		if (ret < 0) break;
 
 		if (smart_url)
 		{
-			xmlChar *encoded_url;
-			encoded_url = xmlEncodeEntitiesReentrant (doc, url);
-			xml_node = xmlNewChild (item_node, ephy_ns, "smartlink", encoded_url);
-			xmlFree (encoded_url);
+			ret = xmlTextWriterWriteElementNS (writer, "ephy", "smartlink", NULL, url);
+			if (ret < 0) break;
 		}
 
-		add_topics_list (topics, kid, item_node, dc_ns);
+		ret = write_topics_list (topics, kid, writer);
+		if (ret < 0) break;
+
+		ret = xmlTextWriterEndElement (writer); /* item */
 
-		xmlFree (encoded_link);
 		g_free (link);
+
+		i++;
 	}
 	ephy_node_thaw (bmks);
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterEndElement (writer); /* rdf:RDF */
+	if (ret < 0) goto out;
+
+	ret = xmlTextWriterEndDocument (writer);
+
+out:
+	xmlFreeTextWriter (writer);
+
+	if (ret >= 0)
+	{
+		if (ephy_file_switch_temp_file (filename, tmp_file) == FALSE)
+		{
+			ret = -1;
+		}
+	}
+
+	STOP_PROFILER ("Exporting as RDF")
 
-	ephy_file_save_xml (filename, doc);
-	xmlFreeDoc(doc);
+	LOG ("Exporting as RDF %s.", ret >= 0 ? "succeeded" : "FAILED")
 }