Interface CodeTransform

All Superinterfaces:: ClassFileTransform<CodeTransform, CodeElement, CodeBuilder>

Functional Interface:: This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public non-sealed interface CodeTransform extends ClassFileTransform<CodeTransform, CodeElement, CodeBuilder>

A transformation on streams of CodeElement. The stream can come from a CodeModel, or a handler to a CodeBuilder as in CodeBuilder.transforming(CodeTransform, Consumer).

Refer to ClassFileTransform for general guidance and caution around the use of transforms for structures in the class file format.

A code transform can be lifted to a method or a class transform via MethodTransform.transformingCode(CodeTransform) and ClassTransform.transformingMethodBodies(CodeTransform), transforming only the CodeModel within those structures and passing all other elements to the builders.

Since:

See Also:

Field Summary

Modifier and Type	Field	Description
`static final CodeTransform`	`ACCEPT_ALL`	A code transform that passes all elements to the builder.

Method Summary

Modifier and Type	Method	Description
`default CodeTransform`	`andThen(CodeTransform t)`	Chain this transform with another; elements presented to the builder of this transform will become the input to the next transform.
`static CodeTransform`	`endHandler(Consumer<CodeBuilder> finisher)`	Creates a code transform that passes each element through to the builder, and calls the specified function when transformation is complete.
`static CodeTransform`	`ofStateful(Supplier<CodeTransform> supplier)`	Creates a stateful code transform from a `Supplier`.

Methods declared in interface ClassFileTransform

accept, atEnd, atStart

Field Details

ACCEPT_ALL

static final CodeTransform ACCEPT_ALL

A code transform that passes all elements to the builder.

Method Details

ofStateful

static CodeTransform ofStateful(Supplier<CodeTransform> supplier)

Creates a stateful code transform from a Supplier. The supplier will be invoked for each transformation.

Parameters:: supplier - a Supplier that produces a fresh transform object for each traversal
Returns:: the stateful code transform

endHandler

static CodeTransform endHandler(Consumer<CodeBuilder> finisher)

Creates a code transform that passes each element through to the builder, and calls the specified function when transformation is complete.

Parameters:: finisher - the function to call when transformation is complete
Returns:: the code transform

andThen

default CodeTransform andThen(CodeTransform t)

Description copied from interface: ClassFileTransform

Chain this transform with another; elements presented to the builder of this transform will become the input to the next transform.

This method is implemented by the Class-File API. Users usually don't have sufficient access to Class-File API functionalities to override this method correctly for generic downstream transforms.

Specified by:: andThen in interface ClassFileTransform<CodeTransform, CodeElement, CodeBuilder>
Implementation Requirements:: The default implementation returns this code transform chained with another code transform from the argument. Chaining of two transforms requires to involve a chained builder serving as a target builder for this transform and also as a source of elements for the downstream transform.
Parameters:: t - the downstream transform
Returns:: the chained transform

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/lang/classfile/CodeTransform.html