ifaceproperties.c

this is a glib for c language

/* GObject - GLib Type, Object, Parameter and Signal Library
 * Copyright (C) 2001, 2003 Red Hat, Inc.
 *
 * This library 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 2 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#undef	G_LOG_DOMAIN
#define	G_LOG_DOMAIN "TestIfaceProperties"

#undef G_DISABLE_ASSERT
#undef G_DISABLE_CHECKS
#undef G_DISABLE_CAST_CHECKS

#include <string.h>

#include <glib-object.h>

#include "testcommon.h"

/* This test tests interface properties, implementing interface
 * properties and #GParamSpecOverride.
 *
 * Four properties are tested:
 *
 * prop1: Defined in TestIface, Implemented in BaseObject with a GParamSpecOverride
 * prop2: Defined in TestIface, Implemented in BaseObject with a new property
 * prop3: Defined in TestIface, Implemented in BaseObject, Overridden in DerivedObject
 * prop4: Defined in BaseObject, Overridden in DerivedObject
 */
   
static GType base_object_get_type ();
static GType derived_object_get_type ();

enum {
  BASE_PROP_0,
  BASE_PROP1,
  BASE_PROP2,
  BASE_PROP3,
  BASE_PROP4
};

enum {
  DERIVED_PROP_0,
  DERIVED_PROP3,
  DERIVED_PROP4
};

/*
 * BaseObject, a parent class for DerivedObject
 */
#define BASE_TYPE_OBJECT          (base_object_get_type ())
#define BASE_OBJECT(obj)	  (G_TYPE_CHECK_INSTANCE_CAST ((obj), BASE_TYPE_OBJECT, BaseObject))
typedef struct _BaseObject        BaseObject;
typedef struct _BaseObjectClass   BaseObjectClass;

struct _BaseObject
{
  GObject parent_instance;

  gint val1;
  gint val2;
  gint val3;
  gint val4;
};
struct _BaseObjectClass
{
  GObjectClass parent_class;
};

GObjectClass *base_parent_class;

/*
 * DerivedObject, the child class of DerivedObject
 */
#define DERIVED_TYPE_OBJECT          (derived_object_get_type ())
typedef struct _DerivedObject        DerivedObject;
typedef struct _DerivedObjectClass   DerivedObjectClass;

struct _DerivedObject
{
  BaseObject parent_instance;
};
struct _DerivedObjectClass
{
  BaseObjectClass parent_class;
};

/*
 * The interface
 */
typedef struct _TestIfaceClass TestIfaceClass;

struct _TestIfaceClass
{
  GTypeInterface base_iface;
};

#define TEST_TYPE_IFACE (test_iface_get_type ())

/* The paramspecs installed on our interface
 */
static GParamSpec *iface_spec1, *iface_spec2, *iface_spec3;

/* The paramspecs inherited by our derived object
 */
static GParamSpec *inherited_spec1, *inherited_spec2, *inherited_spec3, *inherited_spec4;

static void
test_iface_default_init (TestIfaceClass *iface_vtable)
{
  inherited_spec1 = iface_spec1 = g_param_spec_int ("prop1",
						    "Prop1",
						    "Property 1",
						    G_MININT, /* min */
						    0xFFFF,  /* max */
						    42,       /* default */
						    G_PARAM_READWRITE | G_PARAM_CONSTRUCT);
  g_object_interface_install_property (iface_vtable, iface_spec1);

  iface_spec2 = g_param_spec_int ("prop2",
				  "Prop2",
				  "Property 2",
				  G_MININT, /* min */
				  G_MAXINT, /* max */
				  0,	       /* default */
				  G_PARAM_WRITABLE);
  g_object_interface_install_property (iface_vtable, iface_spec2);
    
  inherited_spec3 = iface_spec3 = g_param_spec_int ("prop3",
						    "Prop3",
						    "Property 3",
						    G_MININT, /* min */
						    G_MAXINT, /* max */
						    0,	       /* default */
						    G_PARAM_READWRITE);
  g_object_interface_install_property (iface_vtable, iface_spec3);
}

static DEFINE_IFACE (TestIface, test_iface, NULL, test_iface_default_init)


static GObject*
base_object_constructor  (GType                  type,
			  guint                  n_construct_properties,
			  GObjectConstructParam *construct_properties)
{
  /* The constructor is the one place where a GParamSpecOverride is visible
   * to the outside world, so we do a bunch of checks here
   */
  GValue value1 = { 0, };
  GValue value2 = { 0, };
  GParamSpec *pspec;

  g_assert (n_construct_properties == 1);

  pspec = construct_properties->pspec;

  /* Check we got the param spec we expected
   */
  g_assert (G_IS_PARAM_SPEC_OVERRIDE (pspec));
  g_assert (pspec->param_id == BASE_PROP1);
  g_assert (strcmp (g_param_spec_get_name (pspec), "prop1") == 0);
  g_assert (g_param_spec_get_redirect_target (pspec) == iface_spec1);

  /* Test redirection of the nick and blurb to the redirect target
   */
  g_assert (strcmp (g_param_spec_get_nick (pspec), "Prop1") == 0);
  g_assert (strcmp (g_param_spec_get_blurb (pspec), "Property 1") == 0);

  /* Test forwarding of the various GParamSpec methods to the redirect target
   */
  g_value_init (&value1, G_TYPE_INT);
  g_value_init (&value2, G_TYPE_INT);
  
  g_param_value_set_default (pspec, &value1);
  g_assert (g_value_get_int (&value1) == 42);

  g_value_reset (&value1);
  g_value_set_int (&value1, 0x10000);
  g_assert (g_param_value_validate (pspec, &value1));
  g_assert (g_value_get_int (&value1) == 0xFFFF);
  g_assert (!g_param_value_validate (pspec, &value1));
  
  g_value_reset (&value1);
  g_value_set_int (&value1, 1);
  g_value_set_int (&value2, 2);
  g_assert (g_param_values_cmp (pspec, &value1, &value2) < 0);
  g_assert (g_param_values_cmp (pspec, &value2, &value1) > 0);
  
  g_value_unset (&value1);
  g_value_unset (&value2);

  return base_parent_class->constructor (type,
					 n_construct_properties,
					 construct_properties);
}

static void
base_object_set_property (GObject      *object,
			  guint         prop_id,
			  const GValue *value,
			  GParamSpec   *pspec)
{
  BaseObject *base_object = BASE_OBJECT (object);
  
  switch (prop_id)
    {
    case BASE_PROP1:
      g_assert (pspec == inherited_spec1);
      base_object->val1 = g_value_get_int (value);
      break;
    case BASE_PROP2:
      g_assert (pspec == inherited_spec2);
      base_object->val2 = g_value_get_int (value);
      break;
    case BASE_PROP3:
      g_assert_not_reached ();
      break;
    case BASE_PROP4:
      g_assert_not_reached ();
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
base_object_get_property (GObject                *object,
			  guint                   prop_id,
			  GValue                 *value,
			  GParamSpec             *pspec)
{
  BaseObject *base_object = BASE_OBJECT (object);

  switch (prop_id)
    {
    case BASE_PROP1:
      g_assert (pspec == inherited_spec1);
      g_value_set_int (value, base_object->val1);
      break;
    case BASE_PROP2:
      g_assert (pspec == inherited_spec2);
      g_value_set_int (value, base_object->val2);
      break;
    case BASE_PROP3:
      g_assert_not_reached ();
      break;
    case BASE_PROP4:
      g_assert_not_reached ();
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
base_object_notify (GObject    *object,
		    GParamSpec *pspec)
{
  /* The property passed to notify is the redirect target, not the
   * GParamSpecOverride
   */
  g_assert (pspec == inherited_spec1 ||
	    pspec == inherited_spec2 ||
	    pspec == inherited_spec3 ||
	    pspec == inherited_spec4);
}

static void
base_object_class_init (BaseObjectClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);

  base_parent_class= g_type_class_peek_parent (class);

  object_class->constructor = base_object_constructor;
  object_class->set_property = base_object_set_property;
  object_class->get_property = base_object_get_property;
  object_class->notify = base_object_notify;

  g_object_class_override_property (object_class, BASE_PROP1, "prop1");

  /* We override this one using a real property, not GParamSpecOverride
   * We change the flags from READONLY to READWRITE to show that we
   * can make the flags less restrictive
   */
  inherited_spec2 = g_param_spec_int ("prop2",
				      "Prop2",
				      "Property 2",
				      G_MININT, /* min */
				      G_MAXINT, /* max */
				      0,	       /* default */
				      G_PARAM_READWRITE);
  g_object_class_install_property (object_class, BASE_PROP2, inherited_spec2);

  g_object_class_override_property (object_class, BASE_PROP3, "prop3");
  
  inherited_spec4 = g_param_spec_int ("prop4",
				      "Prop4",
				      "Property 4",
				      G_MININT, /* min */
				      G_MAXINT, /* max */
				      0,	       /* default */
				      G_PARAM_READWRITE);
  g_object_class_install_property (object_class, BASE_PROP4, inherited_spec4);
}

static void
base_object_init (BaseObject *base_object)
{
  base_object->val1 = 42;
}

static DEFINE_TYPE_FULL (BaseObject, base_object,
			 base_object_class_init, NULL, base_object_init,
			 G_TYPE_OBJECT,
			 INTERFACE (NULL, TEST_TYPE_IFACE))

static void
derived_object_set_property (GObject      *object,
			     guint         prop_id,
			     const GValue *value,
			     GParamSpec   *pspec)
{
  BaseObject *base_object = BASE_OBJECT (object);

  switch (prop_id)
    {
    case DERIVED_PROP3:
      g_assert (pspec == inherited_spec3);
      base_object->val3 = g_value_get_int (value);
      break;
    case DERIVED_PROP4:
      g_assert (pspec == inherited_spec4);
      base_object->val4 = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
derived_object_get_property (GObject                *object,
			     guint                   prop_id,
			     GValue                 *value,
			     GParamSpec             *pspec)
{
  BaseObject *base_object = BASE_OBJECT (object);

  switch (prop_id)
    {
    case DERIVED_PROP3:
      g_assert (pspec == inherited_spec3);
      g_value_set_int (value, base_object->val3);
      break;
    case DERIVED_PROP4:
      g_assert (pspec == inherited_spec4);
      g_value_set_int (value, base_object->val4);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
derived_object_class_init (DerivedObjectClass *class)
{
  GObjectClass *object_class = G_OBJECT_CLASS (class);

  object_class->set_property = derived_object_set_property;
  object_class->get_property = derived_object_get_property;

  /* Overriding a property that is itself overridding an interface property */
  g_object_class_override_property (object_class, DERIVED_PROP3, "prop3");

  /* Overriding a property not from an interface */
  g_object_class_override_property (object_class, DERIVED_PROP4, "prop4");
}

static DEFINE_TYPE (DerivedObject, derived_object,
		    derived_object_class_init, NULL, NULL,
		    BASE_TYPE_OBJECT)

/* Helper function for testing ...list_properties()
 */
static void
assert_in_properties (GParamSpec  *param_spec,
		      GParamSpec **properties,
		      gint         n_properties)
{
  gint i;
  gboolean found = FALSE;

  for (i = 0; i < n_properties; i++)
    {
      if (properties[i] == param_spec)
	found = TRUE;
    }

  g_assert (found);
}

int
main (gint   argc,
      gchar *argv[])
{
  BaseObject *object;
  GObjectClass *object_class;
  TestIfaceClass *iface_vtable;
  GParamSpec **properties;
  gint n_properties;
  
  gint val1, val2, val3, val4;
	
  g_log_set_always_fatal (g_log_set_always_fatal (G_LOG_FATAL_MASK) |
			  G_LOG_LEVEL_WARNING |
			  G_LOG_LEVEL_CRITICAL);
  g_type_init ();

  object = g_object_new (DERIVED_TYPE_OBJECT, NULL);

  /* Test setting and getting the properties
   */
  g_object_set (object,
		"prop1", 0x0101,
		"prop2", 0x0202,
		"prop3", 0x0303,
		"prop4", 0x0404,
		NULL);
  g_object_get (object,
		"prop1", &val1,
		"prop2", &val2,
		"prop3", &val3,
		"prop4", &val4,
		NULL);

  g_assert (val1 == 0x0101);
  g_assert (val2 == 0x0202);
  g_assert (val3 == 0x0303);
  g_assert (val4 == 0x0404);

  /* Test that the right spec is passed on explicit notifications
   */
  g_object_freeze_notify (G_OBJECT (object));
  g_object_notify (G_OBJECT (object), "prop1");
  g_object_notify (G_OBJECT (object), "prop2");
  g_object_notify (G_OBJECT (object), "prop3");
  g_object_notify (G_OBJECT (object), "prop4");
  g_object_thaw_notify (G_OBJECT (object));

  /* Test g_object_class_find_property() for overridden properties
   */
  object_class = G_OBJECT_GET_CLASS (object);

  g_assert (g_object_class_find_property (object_class, "prop1") == inherited_spec1);
  g_assert (g_object_class_find_property (object_class, "prop2") == inherited_spec2);
  g_assert (g_object_class_find_property (object_class, "prop3") == inherited_spec3);
  g_assert (g_object_class_find_property (object_class, "prop4") == inherited_spec4);

  /* Test g_object_class_list_properties() for overridden properties
   */
  properties = g_object_class_list_properties (object_class, &n_properties);
  g_assert (n_properties == 4);
  assert_in_properties (inherited_spec1, properties, n_properties);
  assert_in_properties (inherited_spec2, properties, n_properties);
  assert_in_properties (inherited_spec3, properties, n_properties);
  assert_in_properties (inherited_spec4, properties, n_properties);
  g_free (properties);

  /* Test g_object_interface_find_property()
   */
  iface_vtable = g_type_default_interface_peek (TEST_TYPE_IFACE);

  g_assert (g_object_interface_find_property (iface_vtable, "prop1") == iface_spec1);
  g_assert (g_object_interface_find_property (iface_vtable, "prop2") == iface_spec2);
  g_assert (g_object_interface_find_property (iface_vtable, "prop3") == iface_spec3);

  /* Test g_object_interface_list_properties()
   */
  properties = g_object_interface_list_properties (iface_vtable, &n_properties);
  g_assert (n_properties == 3);
  assert_in_properties (iface_spec1, properties, n_properties);
  assert_in_properties (iface_spec2, properties, n_properties);
  assert_in_properties (iface_spec3, properties, n_properties);
  g_free (properties);

  g_object_unref (object);

  return 0;
}