net.bytebuddy.implementation.bytecode

Enum Duplication

java.lang.Object

java.lang.Enum<Duplication>

net.bytebuddy.implementation.bytecode.Duplication

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<Duplication>, StackManipulation

public enum Duplication
extends java.lang.Enum<Duplication>
implements StackManipulation

Duplicates a value that is lying on top of the stack.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	Duplication.WithFlip A duplication that flips a value over the second value on the operand stack.

Nested classes/interfaces inherited from interface net.bytebuddy.implementation.bytecode.StackManipulation

StackManipulation.Compound, StackManipulation.Illegal, StackManipulation.Size, StackManipulation.Trivial

Enum Constant Summary

Enum Constants

Enum Constant and Description
DOUBLE A duplication of a double-sized stack value.
SINGLE A duplication of a single-sized stack values.
ZERO A duplication of no values.

Field Summary

Fields

Modifier and Type	Field and Description
private int	opcode The opcode that represents the manipulation.
protected StackManipulation.Size	size The size representing the impact of applying the duplication onto the operand stack.

Method Summary

Modifier and Type	Method and Description
StackManipulation.Size	apply(org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext) Applies the stack manipulation that is described by this instance.
abstract StackManipulation	flipOver(TypeDefinition typeDefinition) Creates a duplication that flips the stack's top value over the second stack element.
boolean	isValid() Determines if this stack manipulation is valid.
static Duplication	of(TypeDefinition typeDefinition) Duplicates a value given its type.
static Duplication	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static Duplication[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ZERO

public static final Duplication ZERO

A duplication of no values. This corresponds a no-op instruction.

SINGLE

public static final Duplication SINGLE

A duplication of a single-sized stack values.

DOUBLE

public static final Duplication DOUBLE

A duplication of a double-sized stack value.

Field Detail

size

protected final StackManipulation.Size size

The size representing the impact of applying the duplication onto the operand stack.

opcode

private final int opcode

The opcode that represents the manipulation.

Method Detail

values

public static Duplication[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Duplication c : Duplication.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Duplication valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

of

public static Duplication of(TypeDefinition typeDefinition)

Duplicates a value given its type.

Parameters:

typeDefinition - The type to be duplicated.

Returns:

A stack manipulation that duplicates the given type.

flipOver

public abstract StackManipulation flipOver(TypeDefinition typeDefinition)

Creates a duplication that flips the stack's top value over the second stack element.

Parameters:

typeDefinition - The type of the second element on the operand stack.

Returns:

A stack manipulation that represents such a duplication flip.

isValid

public boolean isValid()

Determines if this stack manipulation is valid.

Specified by:

isValid in interface StackManipulation

Returns:

If false, this manipulation cannot be applied and should throw an exception.

apply

public StackManipulation.Size apply(org.objectweb.asm.MethodVisitor methodVisitor,
                                    Implementation.Context implementationContext)

Applies the stack manipulation that is described by this instance.

Specified by:

apply in interface StackManipulation

Parameters:

methodVisitor - The method visitor used to write the method implementation to.

implementationContext - The context of the current implementation.

Returns:

The changes to the size of the operand stack that are implied by this stack manipulation.