[libgda] Added gda_set_replace_source_model() and the "source-model-changed" signal

[Vivien Malerba <vivien src gnome org>]

commit c24ee7c50ba2c8efb8feb55a597d2a9026ff3be2
Author: Vivien Malerba <malerba gnome-db org>
Date:   Wed Jul 28 17:36:01 2010 +0200

    Added gda_set_replace_source_model() and the "source-model-changed" signal

 doc/C/libgda-sections.txt |    1 +
 doc/C/tmpl/gda-set.sgml   |   18 +++++++++
 libgda/gda-set.c          |   92 ++++++++++++++++++++++++++++++++++++++++++++-
 libgda/gda-set.h          |    5 ++-
 libgda/libgda.symbols     |    1 +
 5 files changed, 115 insertions(+), 2 deletions(-)
---
diff --git a/doc/C/libgda-sections.txt b/doc/C/libgda-sections.txt
index 39b5cc0..a46b61e 100644
--- a/doc/C/libgda-sections.txt
+++ b/doc/C/libgda-sections.txt
@@ -1048,6 +1048,7 @@ gda_set_get_nth_holder
 gda_set_add_holder
 gda_set_remove_holder
 gda_set_merge_with_set
+gda_set_replace_source_model
 <SUBSECTION>
 GdaSetNode
 gda_set_get_node
diff --git a/doc/C/tmpl/gda-set.sgml b/doc/C/tmpl/gda-set.sgml
index 27b0266..b881580 100644
--- a/doc/C/tmpl/gda-set.sgml
+++ b/doc/C/tmpl/gda-set.sgml
@@ -70,6 +70,14 @@ Container for several values
 
 @gdaset: the object which received the signal.
 
+<!-- ##### SIGNAL GdaSet::source-model-changed ##### -->
+<para>
+
+</para>
+
+ gdaset: the object which received the signal.
+ arg1: 
+
 <!-- ##### SIGNAL GdaSet::validate-holder-change ##### -->
 <para>
 
@@ -236,6 +244,16 @@ Container for several values
 @set_to_merge: 
 
 
+<!-- ##### FUNCTION gda_set_replace_source_model ##### -->
+<para>
+
+</para>
+
+ set: 
+ source: 
+ model: 
+
+
 <!-- ##### STRUCT GdaSetNode ##### -->
 <para>
   For each #GdaHolder object in the #GdaSet object, there is a
diff --git a/libgda/gda-set.c b/libgda/gda-set.c
index 2aab46e..0e81fd2 100644
--- a/libgda/gda-set.c
+++ b/libgda/gda-set.c
@@ -85,10 +85,11 @@ enum
 	VALIDATE_HOLDER_CHANGE,
 	VALIDATE_SET,
 	HOLDER_TYPE_SET,
+	SOURCE_MODEL_CHANGED,
 	LAST_SIGNAL
 };
 
-static gint gda_set_signals[LAST_SIGNAL] = { 0, 0, 0, 0, 0 };
+static gint gda_set_signals[LAST_SIGNAL] = { 0, 0, 0, 0, 0, 0 };
 
 
 /* private structure */
@@ -333,6 +334,24 @@ gda_set_class_init (GdaSetClass *class)
 			      _gda_marshal_VOID__OBJECT, G_TYPE_NONE, 1,
 			      GDA_TYPE_HOLDER);
 
+	/**
+	 * GdaSet::source-model-changed
+	 * @set: the #GdaSet
+	 * @source: the #GdaSetSource for which the @data_model attribute has changed
+	 *
+	 * Gets emitted when the data model in @source has changed
+	 *
+	 * Since: 4.2
+	 */
+	gda_set_signals[SOURCE_MODEL_CHANGED] =
+		g_signal_new ("source-model-changed",
+			      G_TYPE_FROM_CLASS (object_class),
+			      G_SIGNAL_RUN_FIRST,
+			      G_STRUCT_OFFSET (GdaSetClass, source_model_changed),
+			      NULL, NULL,
+			      _gda_marshal_VOID__POINTER, G_TYPE_NONE, 1,
+			      G_TYPE_POINTER);
+
 
 	class->holder_changed = NULL;
 	class->validate_holder_change = m_validate_holder_change;
@@ -340,6 +359,7 @@ gda_set_class_init (GdaSetClass *class)
 	class->holder_attr_changed = NULL;
 	class->public_data_changed = NULL;
 	class->holder_type_set = NULL;
+	class->source_model_changed = NULL;
 
 	/* Properties */
 	object_class->set_property = gda_set_set_property;
@@ -1552,3 +1572,73 @@ gda_set_get_source_for_model (GdaSet *set, GdaDataModel *model)
 
 	return retval;
 }
+
+/**
+ * gda_set_replace_source_model
+ * @set: a #GdaSet object
+ * @source: a pointer to a #GdaSetSource in @set
+ * @model: a #GdaDataModel
+ *
+ * Replaces @source->data_model with @model, which must have the same
+ * characteristics as @source->data_model (same column types)
+ *
+ * Also for each #GdaHolder for which @source->data_model is a source model,
+ * this method calls gda_holder_set_source_model() with @model to replace
+ * the source by the new model
+ *
+ * Since: 4.2
+ */
+void
+gda_set_replace_source_model (GdaSet *set, GdaSetSource *source, GdaDataModel *model)
+{
+	g_return_if_fail (GDA_IS_SET (set));
+	g_return_if_fail (source);
+	g_return_if_fail (g_slist_find (set->sources_list, source));
+	g_return_if_fail (GDA_IS_DATA_MODEL (model));
+	
+	/* compare models */
+	gint ncols, i;
+	ncols = gda_data_model_get_n_columns (source->data_model);
+	if (ncols != gda_data_model_get_n_columns (model)) {
+		g_warning (_("Replacing data model must have the same characteristics as the "
+			     "data model it replaces"));
+		return;
+	}
+	for (i = 0; i < ncols; i++) {
+		GdaColumn *c1, *c2;
+		GType t1, t2;
+		c1 = gda_data_model_describe_column (source->data_model, i);
+		c2 = gda_data_model_describe_column (model, i);
+		t1 = gda_column_get_g_type (c1);
+		t2 = gda_column_get_g_type (c2);
+
+		if ((t1 != GDA_TYPE_NULL) && (t2 != GDA_TYPE_NULL) && (t1 != t2)) {
+			g_warning (_("Replacing data model must have the same characteristics as the "
+				     "data model it replaces"));
+			return;
+		}
+	}
+
+	/* actually swap the models */
+	GSList *list;
+	source->data_model = model;
+	for (list = source->nodes; list; list = list->next) {
+		GdaSetNode *node = (GdaSetNode*) list->data;
+		g_object_unref (node->source_model);
+		node->source_model = g_object_ref (model);
+		g_signal_handlers_block_by_func (G_OBJECT (node->holder),
+						 G_CALLBACK (source_changed_holder_cb), set);
+		gda_holder_set_source_model (GDA_HOLDER (node->holder), model, node->source_column,
+					     NULL);
+		g_signal_handlers_unblock_by_func (G_OBJECT (node->holder),
+						   G_CALLBACK (source_changed_holder_cb), set);
+
+	}
+#ifdef GDA_DEBUG_signal
+	g_print (">> 'SOURCE_MODEL_CHANGED' from %s\n", __FUNCTION__);
+#endif
+	g_signal_emit (G_OBJECT (set), gda_set_signals[SOURCE_MODEL_CHANGED], 0, source);
+#ifdef GDA_DEBUG_signal
+	g_print ("<< 'SOURCE_MODEL_CHANGED' from %s\n", __FUNCTION__);
+#endif
+}
diff --git a/libgda/gda-set.h b/libgda/gda-set.h
index 957cfc2..4fb136b 100644
--- a/libgda/gda-set.h
+++ b/libgda/gda-set.h
@@ -107,10 +107,10 @@ struct _GdaSetClass
 							const gchar *attr_name, const GValue *attr_value);
 	void                  (*public_data_changed)   (GdaSet *set);
 	void                  (*holder_type_set)       (GdaSet *set, GdaHolder *holder);
+	void                  (*source_model_changed)  (GdaSet *set, GdaSetSource *source);
 
 	/*< private >*/
 	/* Padding for future expansion */
-	void (*_gda_reserved2) (void);
 	void (*_gda_reserved3) (void);
 	void (*_gda_reserved4) (void);
 };
@@ -132,6 +132,9 @@ void          gda_set_remove_holder            (GdaSet *set, GdaHolder *holder);
 void          gda_set_merge_with_set           (GdaSet *set, GdaSet *set_to_merge);
 gboolean      gda_set_is_valid                 (GdaSet *set, GError **error);
 
+void          gda_set_replace_source_model     (GdaSet *set, GdaSetSource *source,
+						GdaDataModel *model);
+
 /* public data lookup functions */
 GdaSetNode   *gda_set_get_node                 (GdaSet *set, GdaHolder *holder);
 GdaSetSource *gda_set_get_source_for_model     (GdaSet *set, GdaDataModel *model);
diff --git a/libgda/libgda.symbols b/libgda/libgda.symbols
index 4144617..7bde6d0 100644
--- a/libgda/libgda.symbols
+++ b/libgda/libgda.symbols
@@ -570,6 +570,7 @@
 	gda_set_new_from_spec_string
 	gda_set_new_inline
 	gda_set_remove_holder
+	gda_set_replace_source_model
 	gda_set_set_holder_value
 	gda_short_get_type
 	gda_sql_any_part_check_structure