Redesign MatrixStateEvent as a GObject

.gitignore

@@ -70,3 +70,4 @@ Makefile.in
 /src/matrix-presence-event.c
 /src/matrix-room-event.c
 /src/matrix-room-member-event.c
+/src/matrix-state-event.c

src/Makefile.am

@@ -24,6 +24,7 @@ libmatrix_glib_0_0_la_VALA_SOURCES = \
 	matrix-compacts.vala \
 	matrix-event.vala \
 	matrix-presence-event.vala \
+	matrix-state-event.vala \
 	matrix-room-event.vala \
 	matrix-room-member-event.vala \
 	$(NULL)

src/matrix-http-api.vala

@@ -797,9 +797,7 @@ public class Matrix.HTTPAPI : GLib.Object, Matrix.API {
             builder.begin_array();
             initial_state.foreach(
                     (entry) => {
-                        try {
-                            builder.add_value(entry.get_json_node());
-                        } catch (Matrix.Error e) {}
+                        builder.add_value(entry.json);
                     });
             builder.end_array();
         }

src/matrix-state-event.vala

@@ -0,0 +1,58 @@
+/*
+ * This file is part of matrix-glib-sdk
+ *
+ * matrix-glib-sdk is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * matrix-glib-sdk is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with matrix-glib-sdk. If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+namespace Matrix {
+    public class StateEvent : Matrix.Event {
+        public string? state_key { get; set; default = null; }
+        public Json.Node? content { get; set; default = null; }
+
+        protected override void
+        from_json(Json.Node json_data)
+            throws Matrix.Error
+        {
+            var root = json_data.get_object();
+            Json.Node? node;
+
+            if ((node = root.get_member("state_key")) != null) {
+                state_key = node.get_string();
+            }
+
+            if ((node = root.get_member("content")) != null) {
+                content = node;
+            }
+
+            base.from_json(json_data);
+        }
+
+        protected override void
+        to_json(Json.Node json_node)
+            throws Matrix.Error
+        {
+            var root = json_node.get_object();
+
+            if (state_key != null) {
+                root.set_string_member("state_key", state_key);
+            }
+
+            if (content != null) {
+                root.set_member("content", content);
+            }
+
+            base.to_json(json_node);
+        }
+    }
+}