From a8436e9b42a1b5a2b30b13a13496539fc23f480e Mon Sep 17 00:00:00 2001
From: Matthias Vogelgesang <matthias.vogelgesang@kit.edu>
Date: Fri, 2 Mar 2012 10:31:40 +0100
Subject: Make UcaCamera a base class not an interface

---
 src/uca-camera.c | 88 +++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 72 insertions(+), 16 deletions(-)

(limited to 'src/uca-camera.c')

diff --git a/src/uca-camera.c b/src/uca-camera.c
index cb7890b..d8c1a25 100644
--- a/src/uca-camera.c
+++ b/src/uca-camera.c
@@ -18,7 +18,19 @@
 #include <glib.h>
 #include "uca-camera.h"
 
-G_DEFINE_INTERFACE(UcaCamera, uca_camera, G_TYPE_OBJECT)
+#define UCA_CAMERA_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UCA_TYPE_CAMERA, UcaCameraPrivate))
+
+G_DEFINE_TYPE(UcaCamera, uca_camera, G_TYPE_OBJECT)
+
+/**
+ * UcaCameraError:
+ * @UCA_CAMERA_ERROR_RECORDING: Camera is already recording
+ * @UCA_CAMERA_ERROR_NOT_RECORDING: Camera is not recording
+ */
+GQuark uca_camera_error_quark()
+{
+    return g_quark_from_static_string("uca-camera-error-quark");
+}
 
 enum {
     PROP_0 = 0,
@@ -30,10 +42,26 @@ enum {
     N_PROPERTIES
 };
 
+struct _UcaCameraPrivate {
+    gboolean recording;
+};
+
 static GParamSpec *uca_camera_properties[N_PROPERTIES] = { NULL, };
 
-static void uca_camera_default_init(UcaCameraInterface *klass)
+static void uca_camera_set_property(GObject *object, guint property_id, const GValue *value, GParamSpec *pspec)
+{
+}
+
+static void uca_camera_get_property(GObject *object, guint property_id, GValue *value, GParamSpec *pspec)
+{
+}
+
+static void uca_camera_class_init(UcaCameraClass *klass)
 {
+    GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
+    gobject_class->set_property = uca_camera_set_property;
+    gobject_class->get_property = uca_camera_get_property;
+
     klass->start_recording = NULL;
     klass->stop_recording = NULL;
     klass->grab = NULL;
@@ -73,43 +101,71 @@ static void uca_camera_default_init(UcaCameraInterface *klass)
             1, G_MAXUINT, 1,
             G_PARAM_READWRITE);
 
-    for (int i = PROP_0 + 1; i < N_PROPERTIES; i++)
-        g_object_interface_install_property(klass, uca_camera_properties[i]);
+    for (guint id = PROP_0 + 1; id < N_PROPERTIES; id++)
+        g_object_class_install_property(gobject_class, id, uca_camera_properties[id]);
+
+    g_type_class_add_private(klass, sizeof(UcaCameraPrivate));
+}
+
+static void uca_camera_init(UcaCamera *camera)
+{
+    camera->priv = UCA_CAMERA_GET_PRIVATE(camera);
+    camera->priv->recording = FALSE;
 }
 
 void uca_camera_start_recording(UcaCamera *camera, GError **error)
 {
     g_return_if_fail(UCA_IS_CAMERA(camera));
 
-    UcaCameraInterface *iface = UCA_CAMERA_GET_INTERFACE(camera);
+    UcaCameraClass *klass = UCA_CAMERA_GET_CLASS(camera);
+
+    g_return_if_fail(klass != NULL);
+    g_return_if_fail(klass->start_recording != NULL);
 
-    g_return_if_fail(iface != NULL);
-    g_return_if_fail(iface->start_recording != NULL);
+    if (camera->priv->recording) {
+        g_set_error(error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_RECORDING,
+                "Camera is already recording");
+        return;
+    }
 
-    (*iface->start_recording)(camera, error);
+    camera->priv->recording = TRUE;
+    (*klass->start_recording)(camera, error);
 }
 
 void uca_camera_stop_recording(UcaCamera *camera, GError **error)
 {
     g_return_if_fail(UCA_IS_CAMERA(camera));
 
-    UcaCameraInterface *iface = UCA_CAMERA_GET_INTERFACE(camera);
+    UcaCameraClass *klass = UCA_CAMERA_GET_CLASS(camera);
 
-    g_return_if_fail(iface != NULL);
-    g_return_if_fail(iface->start_recording != NULL);
+    g_return_if_fail(klass != NULL);
+    g_return_if_fail(klass->stop_recording != NULL);
 
-    (*iface->stop_recording)(camera, error);
+    if (!camera->priv->recording) {
+        g_set_error(error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_NOT_RECORDING,
+                "Camera is not recording");
+        return;
+    }
+
+    camera->priv->recording = FALSE;
+    (*klass->stop_recording)(camera, error);
 }
 
 void uca_camera_grab(UcaCamera *camera, gchar *data, GError **error)
 {
     g_return_if_fail(UCA_IS_CAMERA(camera));
 
-    UcaCameraInterface *iface = UCA_CAMERA_GET_INTERFACE(camera);
+    UcaCameraClass *klass = UCA_CAMERA_GET_CLASS(camera);
+
+    g_return_if_fail(klass != NULL);
+    g_return_if_fail(klass->grab != NULL);
 
-    g_return_if_fail(iface != NULL);
-    g_return_if_fail(iface->start_recording != NULL);
+    if (!camera->priv->recording) {
+        g_set_error(error, UCA_CAMERA_ERROR, UCA_CAMERA_ERROR_NOT_RECORDING,
+                "Camera is not recording");
+        return;
+    }
 
-    (*iface->grab)(camera, data, error);
+    (*klass->grab)(camera, data, error);
 }
 
-- 
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