[gxml] Porte Vala example to new API

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 5f95c97bd2b32c46b82f8b3271029dadd9869e33
Author: Daniel Espinosa <esodan gmail com>
Date:   Wed Sep 6 13:03:02 2017 -0700

    Porte Vala example to new API
    
    Part of Bug #773428 Fixing.

 examples/meson.build       |    1 +
 examples/vala/example.vala |   84 ++++++++++++++++++++++++++++----------------
 examples/vala/meson.build  |    4 ++
 meson.build                |    1 +
 4 files changed, 60 insertions(+), 30 deletions(-)
---
diff --git a/examples/meson.build b/examples/meson.build
new file mode 100644
index 0000000..3e15c22
--- /dev/null
+++ b/examples/meson.build
@@ -0,0 +1 @@
+subdir('vala')
diff --git a/examples/vala/example.vala b/examples/vala/example.vala
index f0d566f..1e45cbf 100755
--- a/examples/vala/example.vala
+++ b/examples/vala/example.vala
@@ -1,32 +1,32 @@
 using GXml;
 
-void create_a_document () {
+void create_a_document () throws GLib.Error {
        string[] authors = { "John Green", "Jane Austen", "J.D. Salinger" };
        string[] titles = { "The Fault in Our Stars", "Pride & Prejudice", "Nine Stories" };
 
-       Document doc = new Document ();
-       Element root = doc.create_element ("Bookshelf");
+       DomDocument doc = new GomDocument ();
+       DomElement root = doc.create_element ("Bookshelf");
        doc.append_child (root);
-       Element owner = doc.create_element ("Owner");
+       DomElement owner = doc.create_element ("Owner");
        root.append_child (owner);
        owner.set_attribute ("fullname", "John Green");
 
-       Element books = doc.create_element ("Books");
+       DomElement books = doc.create_element ("Books");
        root.append_child (books);
 
        for (int i = 0; i < authors.length; i++) {
-               Element book = doc.create_element ("Book");
+               DomElement book = doc.create_element ("Book");
                book.set_attribute ("author", authors[i]);
                book.set_attribute ("title", titles[i]);
                books.append_child (book);
        }
 
-       stdout.printf ("create_a_document:\n%s\n", doc.to_string (true, 8));
+       stdout.printf ("create_a_document:\n%s\n", (doc as GomDocument).write_string ());
 }
 
-void create_a_document_from_a_string () {
+void create_a_document_from_a_string () throws GLib.Error {
        string xml;
-       Document doc;
+       DomDocument doc;
 
        xml = """<?xml version="1.0"?>
 <Bookshelf>
@@ -38,39 +38,63 @@ void create_a_document_from_a_string () {
 </Books>
 </Bookshelf>""";
 
-       doc = new Document.from_string (xml);
-       stdout.printf ("create_a_document_from_a_string:\n%s\n", doc.to_string (true, 8));
+       doc = new GomDocument.from_string (xml);
+       stdout.printf ("create_a_document_from_a_string:\n%s\n", (doc as GomDocument).write_string ());
 }
 
-void create_a_document_from_a_file () {
-       File f = File.new_for_path ("bookshelf.xml");
-       Cancellable can = new Cancellable ();
-       Document doc;
+void create_a_document_from_a_file (string uri) throws GLib.Error {
+       File f = File.new_for_uri (uri+"/bookshelf2.xml");
+       stdout.printf (uri+"\n");
+       DomDocument doc;
 
-       doc = new Document.from_gfile (f, can);
-       stdout.printf ("create_a_document_from_a_file:\n%s\n", doc.to_string (true, 8));
+       doc = new GomDocument.from_file (f);
+       stdout.printf ("create_a_document_from_a_file:\n%s\n", (doc as GomDocument).write_string ());
 }
 
-void create_a_document_from_a_path () {
-       Document doc;
+void create_a_document_from_a_path (string uri) throws GLib.Error {
+       DomDocument doc;
+       GLib.File f = GLib.File.new_for_uri (uri+"/bookshelf2.xml");
 
-       doc = new Document.from_path ("bookshelf.xml");
-       stdout.printf ("create_a_document_from_a_path:\n%s\n", doc.to_string (true, 8));
+       doc = new GomDocument.from_path (f.get_path ());
+       stdout.printf ("create_a_document_from_a_path:\n%s\n", (doc as GomDocument).write_string ());
 }
 
-void saving_a_document_to_a_path () {
-       Document doc;
+void saving_a_document_to_a_path (string uri) throws GLib.Error {
+       string xml;
+       DomDocument doc;
 
-       doc = new Document.from_path ("bookshelf.xml");
-       doc.save_to_path ("bookshelf2.xml");
+       xml = """<?xml version="1.0"?>
+<Bookshelf>
+<Owner fullname="John Green"/>
+<Books>
+<Book author="John Green" title="The Fault in Our Stars"/>
+<Book author="Jane Austen" title="Pride &amp; Prejudice"/>
+<Book author="J.D. Salinger" title="Nine Stories"/>
+</Books>
+</Bookshelf>""";
+       GLib.File f = GLib.File.new_for_uri (uri+"/bookshelf2.xml");
+       stdout.printf (f.get_path ()+"\n");
+       doc = new GomDocument.from_string (xml);
+       if (f.query_exists ()) f.delete ();
+       (doc as GomDocument).write_file (f);
+       if (!f.query_exists ()) stdout.printf ("Can't save file bookshelf2.xml");
 }
 
 int main (string[] args) {
-       create_a_document ();
-       create_a_document_from_a_string ();
-       create_a_document_from_a_file ();
-       create_a_document_from_a_path ();
-       saving_a_document_to_a_path ();
+       GLib.File ex = GLib.File.new_for_path (args[0]);
+       GLib.File fex = ex.get_parent ();
+       
+       try {
+               create_a_document ();
+               create_a_document_from_a_string ();
+               saving_a_document_to_a_path (fex.get_uri ());
+               create_a_document_from_a_path (fex.get_uri ());
+               create_a_document_from_a_file (fex.get_uri ());
+               GLib.File f = GLib.File.new_for_uri (fex.get_uri ()+"/bookshelf2.xml");
+               if (f.query_exists ()) f.delete ();
+       } catch (GLib.Error e) {
+               warning ("Error: "+e.message);
+       }
 
        return 0;
 }
diff --git a/examples/vala/meson.build b/examples/vala/meson.build
new file mode 100644
index 0000000..8b3a0e0
--- /dev/null
+++ b/examples/vala/meson.build
@@ -0,0 +1,4 @@
+executable('gxml-vala', 'example.vala',
+       link_with: [lib],
+       dependencies: [xml, gio, gee, inc_rooth_dep]
+       )
diff --git a/meson.build b/meson.build
index 5a588e5..55d069f 100644
--- a/meson.build
+++ b/meson.build
@@ -22,3 +22,4 @@ subdir('vapi')
 subdir('gxml')
 subdir('docs')
 subdir('test')
+subdir('examples')