Package org.gnome.gobject

Interface TypeValueLCopyFunc

All Superinterfaces:

FunctionPointer

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
@Generated("io.github.jwharm.JavaGI")
public interface TypeValueLCopyFunc
extends FunctionPointer

Functional interface declaration of the TypeValueLCopyFunc callback.

See Also:

• run(org.gnome.gobject.Value, org.gnome.gobject.TypeCValue[], int)

Method Summary

Modifier and Type	Method	Description
String	run(Value value, @Nullable TypeCValue @Nullable [] collectValues, int collectFlags)	This function is responsible for storing the value contents into arguments passed through a variadic argument list which got collected into collect_values according to lcopy_format.
default MemorySegment	toCallback(Arena arena)	Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int, java.lang.foreign.MemorySegment, int) method.
default MemorySegment	upcall(MemorySegment value, int nCollectValues, MemorySegment collectValues, int collectFlags)	The upcall method is called from native code.

Method Details

run

String run(Value value,
 @Nullable TypeCValue @Nullable [] collectValues,
 int collectFlags)

This function is responsible for storing the value contents into arguments passed through a variadic argument list which got collected into collect_values according to lcopy_format.

The n_collect_values argument equals the string length of lcopy_format, and collect_flags may contain G_VALUE_NOCOPY_CONTENTS.

In contrast to GTypeValueCollectFunc, this function is obliged to always properly support G_VALUE_NOCOPY_CONTENTS.

Similar to GTypeValueCollectFunc the function may prematurely abort by returning a newly allocated string describing an error condition. To complete the string example:

gchar **string_p = collect_values[0].v_pointer;
 g_return_val_if_fail (string_p != NULL,
   g_strdup ("string location passed as NULL"));

 if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
   *string_p = value->data[0].v_pointer;
 else
   *string_p = g_strdup (value->data[0].v_pointer);
 

And an illustrative version of this function for reference-counted types:

GObject **object_p = collect_values[0].v_pointer;
 g_return_val_if_fail (object_p != NULL,
   g_strdup ("object location passed as NULL"));

 if (value->data[0].v_pointer == NULL)
   *object_p = NULL;
 else if (collect_flags & G_VALUE_NOCOPY_CONTENTS) // always honour
   *object_p = value->data[0].v_pointer;
 else
   *object_p = g_object_ref (value->data[0].v_pointer);

 return NULL;
 

Since:

2.78

upcall

default MemorySegment upcall(MemorySegment value,
 int nCollectValues,
 MemorySegment collectValues,
 int collectFlags)

The upcall method is called from native code. The parameters are marshaled and run(org.gnome.gobject.Value, org.gnome.gobject.TypeCValue[], int) is executed.

toCallback

default MemorySegment toCallback(Arena arena)

Creates a native function pointer to the upcall(java.lang.foreign.MemorySegment, int, java.lang.foreign.MemorySegment, int) method.

Specified by:

toCallback in interface FunctionPointer

Parameters:

arena - the arena in which the function pointer is allocated

Returns:

the native function pointer