Package net.bytebuddy.implementation

Class FieldAccessor

java.lang.Object

net.bytebuddy.implementation.FieldAccessor

All Implemented Interfaces:

InstrumentedType.Prepareable, Implementation

Direct Known Subclasses:

FieldAccessor.ForImplicitProperty, FieldAccessor.ForSetter

@Enhance
public abstract class FieldAccessor
extends Object
implements Implementation

Defines a method to access a given field by following the Java bean conventions for getters and setters:

• Getter: A method named getFoo() will be instrumented to read and return the value of a field foo or another field if one was specified explicitly. If a property is of type Boolean or boolean, the name isFoo() is also permitted.
• Setter: A method named setFoo(value) will be instrumented to write the given argument value to a field foo or to another field if one was specified explicitly.

Field accessors always implement a getter if a non-void value is returned from a method and attempt to define a setter otherwise. If a field accessor is not explicitly defined as a setter via FieldAccessor.PropertyConfigurable, an instrumented method must define exactly one parameter. Using the latter API, an explicit parameter index can be defined and a return value can be specified explicitly when void is not returned.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	FieldAccessor.AssignerConfigurable	A field accessor that can be configured to use a given assigner and runtime type use configuration.
protected static interface	FieldAccessor.FieldLocation	A field location represents an identified field description which depends on the instrumented type and method.
static interface	FieldAccessor.FieldNameExtractor	A field name extractor is responsible for determining a field name to a method that is implemented to access this method.
protected static class	FieldAccessor.ForImplicitProperty	A field accessor for an implicit property where a getter or setter property is inferred from the signature.
protected static class	FieldAccessor.ForSetter<T>	A field accessor for a field setter.
static interface	FieldAccessor.OwnerTypeLocatable	A field accessor that can be configured to locate a field in a specific manner.
static interface	FieldAccessor.PropertyConfigurable	A field accessor that allows to define the access to be a field write of a given argument.

Nested classes/interfaces inherited from interface net.bytebuddy.implementation.Implementation

Implementation.Composable, Implementation.Compound, Implementation.Context, Implementation.Simple, Implementation.SpecialMethodInvocation, Implementation.Target

Nested classes/interfaces inherited from interface net.bytebuddy.dynamic.scaffold.InstrumentedType.Prepareable

InstrumentedType.Prepareable.NoOp

Field Summary

Fields

Modifier and Type	Field	Description
protected final Assigner	assigner	The assigner to use.
protected final FieldAccessor.FieldLocation	fieldLocation	The field's location.
protected final Assigner.Typing	typing	Indicates if dynamic type castings should be attempted for incompatible assignments.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FieldAccessor(FieldAccessor.FieldLocation fieldLocation, Assigner assigner, Assigner.Typing typing)	Creates a new field accessor.

Method Summary

Modifier and Type	Method	Description
static FieldAccessor.AssignerConfigurable	of(Field field)	Defines a field accessor where the specified field is accessed.
static FieldAccessor.AssignerConfigurable	of(FieldDescription fieldDescription)	Defines a field accessor where the specified field is accessed.
static FieldAccessor.OwnerTypeLocatable	of(FieldAccessor.FieldNameExtractor fieldNameExtractor)	Defines a custom strategy for determining the field that is accessed by this field accessor.
static FieldAccessor.OwnerTypeLocatable	ofBeanProperty()	Defines a field accessor where any access is targeted to a field that matches the methods name with the Java specification for bean properties, i.e.
static FieldAccessor.OwnerTypeLocatable	ofField(String name)	Defines a field accessor where any access is targeted to a field named name.

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.bytebuddy.implementation.Implementation

appender

Methods inherited from interface net.bytebuddy.dynamic.scaffold.InstrumentedType.Prepareable

prepare

Field Details

fieldLocation

protected final FieldAccessor.FieldLocation fieldLocation

The field's location.

assigner

protected final Assigner assigner

The assigner to use.

typing

protected final Assigner.Typing typing

Indicates if dynamic type castings should be attempted for incompatible assignments.

Constructor Details

FieldAccessor

protected FieldAccessor(FieldAccessor.FieldLocation fieldLocation,
 Assigner assigner,
 Assigner.Typing typing)

Creates a new field accessor.

Parameters:

fieldLocation - The field's location.

assigner - The assigner to use.

typing - Indicates if dynamic type castings should be attempted for incompatible assignments.

Method Details

ofField

public static FieldAccessor.OwnerTypeLocatable ofField(String name)

Defines a field accessor where any access is targeted to a field named name.

Parameters:

name - The name of the field to be accessed.

Returns:

A field accessor for a field of a given name.

ofBeanProperty

public static FieldAccessor.OwnerTypeLocatable ofBeanProperty()

Defines a field accessor where any access is targeted to a field that matches the methods name with the Java specification for bean properties, i.e. a method getFoo or setFoo(value) will either read or write a field named foo.

Returns:

A field accessor that follows the Java naming conventions for bean properties.

of

public static FieldAccessor.OwnerTypeLocatable of(FieldAccessor.FieldNameExtractor fieldNameExtractor)

Defines a custom strategy for determining the field that is accessed by this field accessor.

Parameters:

fieldNameExtractor - The field name extractor to use.

Returns:

A field accessor using the given field name extractor.

of

public static FieldAccessor.AssignerConfigurable of(Field field)

Defines a field accessor where the specified field is accessed. The field must be within the hierarchy of the instrumented type.

Parameters:

field - The field being accessed.

Returns:

A field accessor for the given field.

of

public static FieldAccessor.AssignerConfigurable of(FieldDescription fieldDescription)

Defines a field accessor where the specified field is accessed. The field must be within the hierarchy of the instrumented type.

Parameters:

fieldDescription - The field being accessed.

Returns:

A field accessor for the given field.