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:

See Also:

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:

asSymbol

default DynamicConstantDesc<?> asSymbol()

Returns a symbolic descriptor for this dynamically-computed constant.

Returns:

a symbolic descriptor for this dynamically-computed constant

See Also:

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

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