Interface ConstantDynamicEntry

All Superinterfaces:

DynamicConstantPoolEntry, LoadableConstantEntry, PoolEntry

public sealed interface ConstantDynamicEntry
extends DynamicConstantPoolEntry, LoadableConstantEntry

Models a CONSTANT_Dynamic_info structure, representing a dynamically-computed constant, in the constant pool of a class file.

The use of a ConstantDynamicEntry is modeled by a DynamicConstantDesc. Conversions are through asSymbol() and ConstantPoolBuilder.constantDynamicEntry(DynamicConstantDesc).

A dynamic constant entry is composite:

ConstantDynamicEntry(
    BootstrapMethodEntry bootstrap,
    NameAndTypeEntry nameAndType
)

where nameAndType.type() is a field descriptor string.

API Note:

A dynamically-computed constant is frequently called a dynamic constant, or a condy, from the abbreviation of "constant dynamic".

See Java Virtual Machine Specification:

4.4.10 The CONSTANT_Dynamic_info and CONSTANT_InvokeDynamic_info Structures

Since:

24

See Also:

• ConstantPoolBuilder::constantDynamicEntry
• DynamicConstantDesc
• Dynamically-computed constants

Field Summary

Fields declared in interface PoolEntry

TAG_CLASS, TAG_DOUBLE, TAG_DYNAMIC, TAG_FIELDREF, TAG_FLOAT, TAG_INTEGER, TAG_INTERFACE_METHODREF, TAG_INVOKE_DYNAMIC, TAG_LONG, TAG_METHOD_HANDLE, TAG_METHOD_TYPE, TAG_METHODREF, TAG_MODULE, TAG_NAME_AND_TYPE, TAG_PACKAGE, TAG_STRING, TAG_UTF8

Modifier and Type	Field	Description
static final int	TAG_CLASS	The tag for CONSTANT_Class constant kind.
static final int	TAG_DOUBLE	The tag for CONSTANT_Double constant kind.
static final int	TAG_DYNAMIC	The tag for CONSTANT_Dynamic constant kind.
static final int	TAG_FIELDREF	The tag for CONSTANT_Fieldref constant kind.
static final int	TAG_FLOAT	The tag for CONSTANT_Float constant kind.
static final int	TAG_INTEGER	The tag for CONSTANT_Integer constant kind.
static final int	TAG_INTERFACE_METHODREF	The tag for CONSTANT_InterfaceMethodref constant kind.
static final int	TAG_INVOKE_DYNAMIC	The tag for CONSTANT_InvokeDynamic constant kind.
static final int	TAG_LONG	The tag for CONSTANT_Long constant kind.
static final int	TAG_METHOD_HANDLE	The tag for CONSTANT_MethodHandle constant kind.
static final int	TAG_METHOD_TYPE	The tag for CONSTANT_MethodType constant kind.
static final int	TAG_METHODREF	The tag for CONSTANT_Methodref constant kind.
static final int	TAG_MODULE	The tag for CONSTANT_Module constant kind.
static final int	TAG_NAME_AND_TYPE	The tag for CONSTANT_NameAndType constant kind.
static final int	TAG_PACKAGE	The tag for CONSTANT_Package constant kind.
static final int	TAG_STRING	The tag for CONSTANT_String constant kind.
static final int	TAG_UTF8	The tag for CONSTANT_Utf8 constant kind.

Method Summary

Modifier and Type	Method	Description
default DynamicConstantDesc<?>	asSymbol()	Returns a symbolic descriptor for this dynamically-computed constant.
default ConstantDesc	constantValue()	Returns a symbolic descriptor of this constant.
default TypeKind	typeKind()	Returns the data type of this constant.
default ClassDesc	typeSymbol()	Returns a symbolic descriptor for the field type of this dynamically-computed constant.

Methods declared in interface DynamicConstantPoolEntry

bootstrap, bootstrapMethodIndex, name, nameAndType, type

Modifier and Type	Method	Description
BootstrapMethodEntry	bootstrap()	Returns the entry in the bootstrap method table for this constant.
int	bootstrapMethodIndex()	Returns index of the entry in the bootstrap method table for this constant.
default Utf8Entry	name()	Returns the name indicated by this symbolic reference.
NameAndTypeEntry	nameAndType()	Returns the name and the descriptor string indicated by this symbolic reference.
default Utf8Entry	type()	Returns the descriptor string indicated by this symbolic reference.

Methods declared in interface PoolEntry

constantPool, index, tag, width

Modifier and Type	Method	Description
ConstantPool	constantPool()	Returns the constant pool this entry is from.
int	index()	Returns the index within the constant pool corresponding to this entry.
int	tag()	Returns the constant pool tag that describes the type of this entry.
int	width()	Returns the number of constant pool slots this entry consumes.

Method Details

typeSymbol

default ClassDesc typeSymbol()

Returns a symbolic descriptor for the field type of this dynamically-computed constant.

Returns:

a symbolic descriptor for the field type of this dynamically-computed constant

constantValue

default ConstantDesc constantValue()

Returns a symbolic descriptor of this constant.

This is equivalent to asSymbol().

Specified by:

constantValue in interface LoadableConstantEntry

Returns:

a symbolic descriptor of this constant

See Also:

• ConstantPoolBuilder.loadableConstantEntry(ConstantDesc)

asSymbol

default DynamicConstantDesc<?> asSymbol()

Returns a symbolic descriptor for this dynamically-computed constant.

Returns:

a symbolic descriptor for this dynamically-computed constant

See Also:

• ConstantPoolBuilder::constantDynamicEntry(DynamicConstantDesc)

typeKind

default TypeKind typeKind()

Returns the data type of this constant.

If the data type is of category 2, this constant must be loaded with ldc2_w; otherwise, the data type is of category 1, and this constant must be loaded with ldc or ldc_w.

Specified by:

typeKind in interface LoadableConstantEntry

API Note:

The data type of a dynamically-computed constant depends on its descriptor, while the data type of all other constants can be determined by their constant type.

Returns:

the data type of this constant