Package org.javagi.gobject.types

Class Types

java.lang.Object

org.javagi.gobject.types.Types

public class Types
extends Object

The Types class contains GType constants, a series of static methods to check gtype characteristics, and static methods to register a Java class as a new GObject-derived GType.

Field Summary

Fields

Modifier and Type	Field	Description
static final Type	ARRAY	The GType for a boxed type holding a GArray reference.
static final Type	BOOKMARK_FILE	The GType for a boxed type holding a GBookmarkFile.
static final Type	BOOLEAN	The fundamental type corresponding to gboolean.
static final Type	BOXED	The fundamental type from which all boxed types are derived.
static final Type	BYTE_ARRAY	The GType for a boxed type holding a GByteArray reference.
static final Type	BYTES	The GType for GBytes.
static final Type	CHAR	The fundamental type corresponding to gchar.
static final Type	CHECKSUM	The GType for a boxed type holding a GChecksum.
static final Type	DATE	The GType for GDate.
static final Type	DATE_TIME	The GType for a boxed type holding a GDateTime.
static final Type	DOUBLE	The fundamental type corresponding to gdouble.
static final Type	ENUM	The fundamental type from which all enumeration types are derived.
static final Type	ERROR	The GType for a boxed type holding a GError.
static final Type	FLAGS	The fundamental type from which all flags types are derived.
static final Type	FLOAT	The fundamental type corresponding to gfloat.
static final Type	GSTRING	The GType for GString.
static final Type	HASH_TABLE	The GType for a boxed type holding a GHashTable reference.
static final Type	INT	The fundamental type corresponding to gint.
static final Type	INT64	The fundamental type corresponding to gint64.
static final Type	INTERFACE	The fundamental type from which all interfaces are derived.
static final Type	INVALID	An invalid GType used as error return value in some functions which return a GType.
static final Type	IO_CHANNEL	The GType for GIOChannel.
static final Type	IO_CONDITION	The GType for GIOCondition.
static final Type	KEY_FILE	The GType for a boxed type holding a GKeyFile.
static final Type	LONG	The fundamental type corresponding to glong.
static final Type	MAIN_CONTEXT	The GType for a boxed type holding a GMainContext.
static final Type	MAIN_LOOP	The GType for a boxed type holding a GMainLoop.
static final Type	MAPPED_FILE	The GType for a boxed type holding a GMappedFile.
static final Type	MARKUP_PARSE_CONTEXT	The GType for a boxed type holding a GMarkupParseContext.
static final Type	MATCH_INFO	The GType for a boxed type holding a GMatchInfo reference.
static final Type	NONE	A fundamental type which is used as a replacement for the C void return type.
static final Type	OBJECT	The fundamental type for GObject.
static final Type	OPTION_GROUP	The GType for a boxed type holding a GOptionGroup.
static final Type	PARAM	The fundamental type from which all GParamSpec types are derived.
static final Type	PATTERN_SPEC	The GType for GPatternSpec.
static final Type	POINTER	The fundamental type corresponding to gpointer.
static final Type	POLLFD	The GType for a boxed type holding a GPollFD.
static final Type	PTR_ARRAY	The GType for a boxed type holding a GPtrArray reference.
static final Type	REGEX	The GType for a boxed type holding a GRegex reference.
static final long	RESERVED_BSE_FIRST	First fundamental type number to create a new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL() reserved for BSE.
static final long	RESERVED_BSE_LAST	Last fundamental type number reserved for BSE.
static final long	RESERVED_GLIB_FIRST	First fundamental type number to create a new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL() reserved for GLib.
static final long	RESERVED_GLIB_LAST	Last fundamental type number reserved for GLib.
static final long	RESERVED_USER_FIRST	First available fundamental type number to create new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL().
static final Type	SOURCE	The GType for a boxed type holding a GSource.
static final Type	STRING	The fundamental type corresponding to nul-terminated C strings.
static final Type	STRV	The GType for a boxed type holding a null-terminated array of strings.
static final Type	THREAD	The GType for a boxed type holding a GThread.
static final Type	TIME_ZONE	The GType for a boxed type holding a GTimeZone.
static final Type	TREE	The GType for GTree.
static final Type	UCHAR	The fundamental type corresponding to guchar.
static final Type	UINT	The fundamental type corresponding to guint.
static final Type	UINT64	The fundamental type corresponding to guint64.
static final Type	ULONG	The fundamental type corresponding to gulong.
static final Type	URI	The GType for a boxed type holding a GUri.
static final Type	VARIANT	The fundamental type corresponding to G_TYPE_VARIANT.
static final Type	VARIANT_BUILDER	The GType for a boxed type holding a GVariantBuilder.
static final Type	VARIANT_DICT	The GType for a boxed type holding a GVariantDict.
static final Type	VARIANT_TYPE	The GType for a boxed type holding a GVariantType.

Constructor Summary

Constructors

Constructor	Description
Types()

Method Summary

Modifier and Type	Method	Description
static <Z> void	applyIfNotNull(@Nullable Consumer<? super Z> func, Z cls)	Apply func to cls if func is not null.
static MemoryLayout	generateClassLayout(Class<?> cls, String typeName)	Generate a MemoryLayout struct with one member: the memory layout of the parent TypeClass
static MemoryLayout	generateIfaceLayout(Class<?> cls, String typeName)	Generate a MemoryLayout struct with one member: the memory layout of GTypeInterface
static <T extends Proxy> Function<MemorySegment,T>	getAddressConstructor(Class<T> cls)	Return the memory address constructor for the provided class.
static <T extends TypeInstance, TC extends TypeClass> Consumer<TC>	getClassInit(Class<T> cls)	Return a lambda that invokes the class initializer, with is a method that is annotated with ClassInit and takes a single parameter of type TypeClass.
static <T extends TypeInstance> Consumer<T>	getInstanceInit(Class<T> cls)	Return a lambda that invokes the instance initializer, with is a method that is annotated with InstanceInit and takes a single parameter of type TypeInstance.
static <T extends TypeInstance> MemoryLayout	getInstanceLayout(Class<T> cls, String typeName)	Return the memory layout defined in the provided class, or if not found, a new MemoryLayout.structLayout with one field that points to the memory layout defined in the direct superclass.
static <T extends TypeInstance, TI extends TypeInterface> Consumer<TI>	getInterfaceInit(Class<T> cls, Class<?> iface)	Return a lambda that invokes the interface initializer, with is a method that is annotated with InterfaceInit and takes a single parameter of the type that is specified with iface.
static MemoryLayout	getLayout(Class<?> cls)	Return the MemoryLayout that is returned by a method with @MemoryLayout annotation, or if that annotation is not found, by invoking cls.getMemoryLayout() if such method exists, or else, return null.
static <TC extends TypeClass> Class<TC>	getTypeClass(Class<?> cls)	Return the inner TypeClass class, or the inner TypeClass from the superclass, or null if not found.
static Set<TypeFlags>	getTypeFlags(Class<?> cls)	Construct a TypeFlags bitfield that specifies whether the provided class is abstract and/or final.
static <TI extends TypeInterface> Class<TI>	getTypeInterface(Class<?> iface)	Return the inner TypeInterface class, or null if not found.
static boolean	HAS_VALUE_TABLE(Type type)	Checks if type has a TypeValueTable.
static boolean	IS_ABSTRACT(Type type)	Checks if type is an abstract type.
static boolean	IS_CLASSED(Type type)	Checks if type is a classed type.
static boolean	IS_DEEP_DERIVABLE(Type type)	Checks if type is a deep derivable type.
static boolean	IS_DEPRECATED(Type type)	Checks if type is deprecated.
static boolean	IS_DERIVABLE(Type type)	Checks if type is a derivable type.
static boolean	IS_DERIVED(Type type)	Checks if type is derived (or in object-oriented terminology: inherited) from another type (this holds true for all non-fundamental types).
static boolean	IS_FINAL(Type type)	Checks if type is a final type.
static boolean	IS_FUNDAMENTAL(Type type)	Checks if type is a fundamental type.
static boolean	IS_INSTANTIATABLE(Type type)	Checks if type can be instantiated.
static boolean	IS_INTERFACE(Type type)	Checks if type is an interface type.
static boolean	IS_VALUE_ABSTRACT(Type type)	Checks if type is an abstract value type.
static boolean	IS_VALUE_TYPE(Type type)	Checks if type is a value type and can be used with g_value_init().
static boolean	isGObjectBased(Class<?> cls)	Check if this class (or in case of an interface, any class that implements it) is a GObject.
static Type	register(Class<?> cls)	Register a new GType for a Java class, interface or enum.
static Type	register(Type parentType, Class<?> javaClass, String typeName, MemoryLayout classLayout, Consumer<TypeClass> classInit, MemoryLayout instanceLayout, Consumer<TypeInstance> instanceInit, Function<MemorySegment,? extends Proxy> constructor, Function<MemorySegment,? extends Proxy> typeClassConstructor, Set<TypeFlags> flags)	Register a new GType.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

INVALID

public static final Type INVALID

An invalid GType used as error return value in some functions which return a GType.

NONE

public static final Type NONE

A fundamental type which is used as a replacement for the C void return type.

INTERFACE

public static final Type INTERFACE

The fundamental type from which all interfaces are derived.

CHAR

public static final Type CHAR

The fundamental type corresponding to gchar.

The type designated by CHAR is unconditionally an 8-bit signed integer. This may or may not be the same type a the C type "gchar".

UCHAR

public static final Type UCHAR

The fundamental type corresponding to guchar.

BOOLEAN

public static final Type BOOLEAN

The fundamental type corresponding to gboolean.

INT

public static final Type INT

The fundamental type corresponding to gint.

UINT

public static final Type UINT

The fundamental type corresponding to guint.

LONG

public static final Type LONG

The fundamental type corresponding to glong.

ULONG

public static final Type ULONG

The fundamental type corresponding to gulong.

INT64

public static final Type INT64

The fundamental type corresponding to gint64.

UINT64

public static final Type UINT64

The fundamental type corresponding to guint64.

ENUM

public static final Type ENUM

The fundamental type from which all enumeration types are derived.

FLAGS

public static final Type FLAGS

The fundamental type from which all flags types are derived.

FLOAT

public static final Type FLOAT

The fundamental type corresponding to gfloat.

DOUBLE

public static final Type DOUBLE

The fundamental type corresponding to gdouble.

STRING

public static final Type STRING

The fundamental type corresponding to nul-terminated C strings.

POINTER

public static final Type POINTER

The fundamental type corresponding to gpointer.

BOXED

public static final Type BOXED

The fundamental type from which all boxed types are derived.

PARAM

public static final Type PARAM

The fundamental type from which all GParamSpec types are derived.

OBJECT

public static final Type OBJECT

The fundamental type for GObject.

VARIANT

public static final Type VARIANT

The fundamental type corresponding to G_TYPE_VARIANT.

All floating G_TYPE_VARIANT instances passed through the GType system are consumed.

Note that callbacks in closures, and signal handlers for signals of return type G_TYPE_VARIANT, must never return floating variants.

Note: GLib 2.24 did include a boxed type with this name. It was replaced with this fundamental type in 2.26.

Since:

2.26

DATE

public static final Type DATE

The GType for GDate.

STRV

public static final Type STRV

The GType for a boxed type holding a null-terminated array of strings.

Since:

2.4

GSTRING

public static final Type GSTRING

The GType for GString.

HASH_TABLE

public static final Type HASH_TABLE

The GType for a boxed type holding a GHashTable reference.

Since:

2.10

REGEX

public static final Type REGEX

The GType for a boxed type holding a GRegex reference.

Since:

2.14

MATCH_INFO

public static final Type MATCH_INFO

The GType for a boxed type holding a GMatchInfo reference.

Since:

2.30

ARRAY

public static final Type ARRAY

The GType for a boxed type holding a GArray reference.

Since:

2.22

BYTE_ARRAY

public static final Type BYTE_ARRAY

The GType for a boxed type holding a GByteArray reference.

Since:

2.22

PTR_ARRAY

public static final Type PTR_ARRAY

The GType for a boxed type holding a GPtrArray reference.

Since:

2.22

BYTES

public static final Type BYTES

The GType for GBytes.

Since:

2.32

VARIANT_TYPE

public static final Type VARIANT_TYPE

The GType for a boxed type holding a GVariantType.

Since:

2.24

ERROR

public static final Type ERROR

The GType for a boxed type holding a GError.

Since:

2.26

DATE_TIME

public static final Type DATE_TIME

The GType for a boxed type holding a GDateTime.

Since:

2.26

TIME_ZONE

public static final Type TIME_ZONE

The GType for a boxed type holding a GTimeZone.

Since:

2.34

IO_CHANNEL

public static final Type IO_CHANNEL

The GType for GIOChannel.

IO_CONDITION

public static final Type IO_CONDITION

The GType for GIOCondition.

VARIANT_BUILDER

public static final Type VARIANT_BUILDER

The GType for a boxed type holding a GVariantBuilder.

Since:

2.30

VARIANT_DICT

public static final Type VARIANT_DICT

The GType for a boxed type holding a GVariantDict.

Since:

2.40

MAIN_LOOP

public static final Type MAIN_LOOP

The GType for a boxed type holding a GMainLoop.

Since:

2.30

MAIN_CONTEXT

public static final Type MAIN_CONTEXT

The GType for a boxed type holding a GMainContext.

Since:

2.30

SOURCE

public static final Type SOURCE

The GType for a boxed type holding a GSource.

Since:

2.30

POLLFD

public static final Type POLLFD

The GType for a boxed type holding a GPollFD.

Since:

2.36

MARKUP_PARSE_CONTEXT

public static final Type MARKUP_PARSE_CONTEXT

The GType for a boxed type holding a GMarkupParseContext.

Since:

2.36

KEY_FILE

public static final Type KEY_FILE

The GType for a boxed type holding a GKeyFile.

Since:

2.32

MAPPED_FILE

public static final Type MAPPED_FILE

The GType for a boxed type holding a GMappedFile.

Since:

2.40

THREAD

public static final Type THREAD

The GType for a boxed type holding a GThread.

Since:

2.36

CHECKSUM

public static final Type CHECKSUM

The GType for a boxed type holding a GChecksum.

Since:

2.36

OPTION_GROUP

public static final Type OPTION_GROUP

The GType for a boxed type holding a GOptionGroup.

Since:

2.44

URI

public static final Type URI

The GType for a boxed type holding a GUri.

Since:

2.66

TREE

public static final Type TREE

The GType for GTree.

Since:

2.68

PATTERN_SPEC

public static final Type PATTERN_SPEC

The GType for GPatternSpec.

Since:

2.70

BOOKMARK_FILE

public static final Type BOOKMARK_FILE

The GType for a boxed type holding a GBookmarkFile.

Since:

2.76

RESERVED_GLIB_FIRST

public static final long RESERVED_GLIB_FIRST

First fundamental type number to create a new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL() reserved for GLib.

See Also:

• Constant Field Values

RESERVED_GLIB_LAST

public static final long RESERVED_GLIB_LAST

Last fundamental type number reserved for GLib.

See Also:

• Constant Field Values

RESERVED_BSE_FIRST

public static final long RESERVED_BSE_FIRST

First fundamental type number to create a new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL() reserved for BSE.

See Also:

• Constant Field Values

RESERVED_BSE_LAST

public static final long RESERVED_BSE_LAST

Last fundamental type number reserved for BSE.

See Also:

• Constant Field Values

RESERVED_USER_FIRST

public static final long RESERVED_USER_FIRST

First available fundamental type number to create new fundamental type id with G_TYPE_MAKE_FUNDAMENTAL().

See Also:

• Constant Field Values

Constructor Details

Types

public Types()

Method Details

IS_FUNDAMENTAL

public static boolean IS_FUNDAMENTAL(Type type)

Checks if type is a fundamental type.

Parameters:

type - A Type value

Returns:

true if type is fundamental

IS_DERIVED

public static boolean IS_DERIVED(Type type)

Checks if type is derived (or in object-oriented terminology: inherited) from another type (this holds true for all non-fundamental types).

Parameters:

type - A Type value

Returns:

true if type is derived

IS_INTERFACE

public static boolean IS_INTERFACE(Type type)

Checks if type is an interface type.

An interface type provides a pure API, the implementation of which is provided by another type (which is then said to conform to the interface). GLib interfaces are somewhat analogous to Java interfaces and C++ classes containing only pure virtual functions, with the difference that GType interfaces are not derivable (but see g_type_interface_add_prerequisite() for an alternative).

Parameters:

type - A Type value

Returns:

true if type is an interface

IS_CLASSED

public static boolean IS_CLASSED(Type type)

Checks if type is a classed type.

A classed type has an associated TypeClass which can be derived to store class-wide virtual function pointers and data for all instances of the type. This allows for subclassing. All GObjects are classed; none of the scalar fundamental types built into GLib are classed.

Interfaces are not classed: while their TypeInterface struct could be considered similar to TypeClass, and classes can derive interfaces, TypeInterface doesn’t allow for subclassing.

Parameters:

type - A Type value

Returns:

true if type is classed

IS_INSTANTIATABLE

public static boolean IS_INSTANTIATABLE(Type type)

Checks if type can be instantiated. Instantiation is the process of creating an instance (object) of this type.

Parameters:

type - A Type value

Returns:

true if type is instantiable

IS_DERIVABLE

public static boolean IS_DERIVABLE(Type type)

Checks if type is a derivable type. A derivable type can be used as the base class of a flat (single-level) class hierarchy.

Parameters:

type - A Type value

Returns:

true if type is derivable

IS_DEEP_DERIVABLE

public static boolean IS_DEEP_DERIVABLE(Type type)

Checks if type is a deep derivable type. A deep derivable type can be used as the base class of a deep (multi-level) class hierarchy.

Parameters:

type - A Type value

Returns:

true if type is deep derivable

IS_ABSTRACT

public static boolean IS_ABSTRACT(Type type)

Checks if type is an abstract type. An abstract type cannot be instantiated and is normally used as an abstract base class for derived classes.

Parameters:

type - A Type value

Returns:

true if type is abstract

IS_VALUE_ABSTRACT

public static boolean IS_VALUE_ABSTRACT(Type type)

Checks if type is an abstract value type. An abstract value type introduces a value table, but can't be used for g_value_init() and is normally used as an abstract base type for derived value types.

Parameters:

type - A Type value

Returns:

true if type is an abstract value type

IS_VALUE_TYPE

public static boolean IS_VALUE_TYPE(Type type)

Checks if type is a value type and can be used with g_value_init().

Parameters:

type - A Type value

Returns:

true if type is a value type

HAS_VALUE_TABLE

public static boolean HAS_VALUE_TABLE(Type type)

Checks if type has a TypeValueTable.

Parameters:

type - A Type value

Returns:

true if type has a value table

IS_FINAL

public static boolean IS_FINAL(Type type)

Checks if type is a final type. A final type cannot be derived any further.

Parameters:

type - A Type value

Returns:

true if type is final

Since:

2.70

IS_DEPRECATED

public static boolean IS_DEPRECATED(Type type)

Checks if type is deprecated. Instantiating a deprecated type will trigger a warning if running with G_ENABLE_DIAGNOSTIC=1.

Parameters:

type - A Type value

Returns:

true if the type is deprecated

Since:

2.76

getInstanceLayout

public static <T extends TypeInstance> MemoryLayout getInstanceLayout(Class<T> cls,
 String typeName)

Return the memory layout defined in the provided class, or if not found, a new MemoryLayout.structLayout with one field that points to the memory layout defined in the direct superclass.

Type Parameters:

T - the class must extend TypeInstance

Parameters:

cls - the class to provide a memory layout for

typeName - the name given tot the generated memory layout

Returns:

the declared memory layout, or if not found, a generated memory layout that copies the memory layout declared in the direct superclass.

getTypeClass

public static <TC extends TypeClass> Class<TC> getTypeClass(Class<?> cls)

Return the inner TypeClass class, or the inner TypeClass from the superclass, or null if not found.

Parameters:

cls - the class that contains (or whose superclass contains) an inner TypeClass class

Returns:

the TypeClass class, or null if not found

getTypeInterface

public static <TI extends TypeInterface> Class<TI> getTypeInterface(Class<?> iface)

Return the inner TypeInterface class, or null if not found.

Type Parameters:

TI - the returned class extends TypeInterface

Parameters:

iface - the interface that contains an inner TypeInterface class

Returns:

the TypeInterface class, or TypeInterface.class if not found

generateClassLayout

public static MemoryLayout generateClassLayout(Class<?> cls,
 String typeName)

Generate a MemoryLayout struct with one member: the memory layout of the parent TypeClass

Parameters:

cls - the class to generate a memory layout for

typeName - the name of the new memory layout

Returns:

the requested memory layout

generateIfaceLayout

public static MemoryLayout generateIfaceLayout(Class<?> cls,
 String typeName)

Generate a MemoryLayout struct with one member: the memory layout of GTypeInterface

Parameters:

cls - the interface to generate a memory layout for

typeName - the name of the new memory layout

Returns:

the requested memory layout

getLayout

public static MemoryLayout getLayout(Class<?> cls)

Return the MemoryLayout that is returned by a method with @MemoryLayout annotation, or if that annotation is not found, by invoking cls.getMemoryLayout() if such method exists, or else, return null.

Parameters:

cls - the class for which to return the declared MemoryLayout

Returns:

the declared MemoryLayout

getAddressConstructor

public static <T extends Proxy>
Function<MemorySegment,T> getAddressConstructor(Class<T> cls)

Return the memory address constructor for the provided class. This is a constructor for a new Proxy instance for a native memory address.

Type Parameters:

T - the class must implement the Proxy interface

Parameters:

cls - the class that declares a constructor with a single MemorySegment parameter

Returns:

the memory address constructor for this class, or null if not found

getInstanceInit

public static <T extends TypeInstance> Consumer<T> getInstanceInit(Class<T> cls)

Return a lambda that invokes the instance initializer, with is a method that is annotated with InstanceInit and takes a single parameter of type TypeInstance.

Type Parameters:

T - the class must extend TypeInstance

Parameters:

cls - the class that declares the instance init method

Returns:

the instance initializer, or a no-op ($ -> {}) if not found

getClassInit

public static <T extends TypeInstance,
TC extends TypeClass>
Consumer<TC> getClassInit(Class<T> cls)

Return a lambda that invokes the class initializer, with is a method that is annotated with ClassInit and takes a single parameter of type TypeClass.

Type Parameters:

T - the class must extend TypeInstance

TC - the class initializer must accept a TypeClass parameter

Parameters:

cls - the class that declares the class init method

Returns:

the class initializer, or null if not found

getInterfaceInit

public static <T extends TypeInstance,
TI extends TypeInterface>
Consumer<TI> getInterfaceInit(Class<T> cls,
 Class<?> iface)

Return a lambda that invokes the interface initializer, with is a method that is annotated with InterfaceInit and takes a single parameter of the type that is specified with iface.

Type Parameters:

T - the class must extend TypeInstance

TI - the iface parameter must extend TypeInterface

Parameters:

cls - the class that declares the interface init method

Returns:

the interface initializer, or null if not found

getTypeFlags

public static Set<TypeFlags> getTypeFlags(Class<?> cls)

Construct a TypeFlags bitfield that specifies whether the provided class is abstract and/or final.

Parameters:

cls - the class for which to generate typeflags

Returns:

the generated typeflags

isGObjectBased

public static boolean isGObjectBased(Class<?> cls)

Check if this class (or in case of an interface, any class that implements it) is a GObject.

Parameters:

cls - the class or interface to check

Returns:

whether this is a class that extends GObject or an interface that has GObject as a prerequisite

register

public static Type register(Class<?> cls)

Register a new GType for a Java class, interface or enum.

• For classes, the GType will inherit from the GType of the Java superclass, and will implement all interfaces that are implemented by the Java class.
• Interfaces will be registered as a GType that inherits from TypeInterface. It is possible to specify prerequisite types using the RegisteredType annotation. When no prerequisites are set, GObject is by default set as a prerequisite.
• Enums will be registered as a GObject enum type. When a flags type is preferred, add the Flags annotation on the enum.

The name of the new GType will be the simple name of the Java class, but can also be specified with the RegisteredType annotation. (All invalid characters, including '.', are replaced with underscores.)

Use ClassInit and InstanceInit annotations on static methods in the Java class to indicate that these are to be called during GObject class- and instance initialization.

The TypeFlags.ABSTRACT and TypeFlags.FINAL flags are set for abstract and final Java classes.

Parameters:

cls - the class, interface or enumeration to register

Returns:

the GType of the registered Java type

register

public static Type register(Type parentType,
 Class<?> javaClass,
 String typeName,
 MemoryLayout classLayout,
 Consumer<TypeClass> classInit,
 MemoryLayout instanceLayout,
 Consumer<TypeInstance> instanceInit,
 Function<MemorySegment,? extends Proxy> constructor,
 Function<MemorySegment,? extends Proxy> typeClassConstructor,
 Set<TypeFlags> flags)

Register a new GType.

Parameters:

parentType - parent GType

typeName - name of the GType

classLayout - memory layout of the typeclass

classInit - static class initializer function

instanceLayout - memory layout of the typeinstance

instanceInit - static instance initializer function

flags - type flags

Returns:

the GType of the registered Java type

applyIfNotNull

public static <Z> void applyIfNotNull(@Nullable
 @Nullable Consumer<? super Z> func,
 @NotNull
 Z cls)

Apply func to cls if func is not null.

Type Parameters:

Z - func must accept the type of cls as its parameter

Parameters:

func - a nullable Consumer operation that will be applied to cls

cls - the Class that will be passed to func