Module io.helidon.service.codegen

Package io.helidon.service.codegen

Class DefaultsCodegen

java.lang.Object

io.helidon.service.codegen.DefaultsCodegen

public final class DefaultsCodegen
extends Object

Code generation for handling of Default annotations.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	DefaultsCodegen.DefaultCode	Information about a default element.

Method Summary

Modifier and Type	Method	Description
static void	codegenOptional(ContentBuilder<?> contentBuilder, DefaultsCodegen.DefaultCode defaultCode, FieldHandler constantHandler, DefaultsParams params)	Code generate default handling after an optional of the correct type.
static Optional<DefaultsCodegen.DefaultCode>	findDefault(Set<Annotation> annotations, TypeName targetType)	Find a default annotation within the set of annotations on an element.

Methods inherited from class java.lang.Object

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

Method Details

findDefault

public static Optional<DefaultsCodegen.DefaultCode> findDefault(Set<Annotation> annotations,
 TypeName targetType)

Find a default annotation within the set of annotations on an element.

Parameters:

annotations - annotations on an element

targetType - type that is expected in the code

Returns:

default annotation, or empty if no default is defined

codegenOptional

public static void codegenOptional(ContentBuilder<?> contentBuilder,
 DefaultsCodegen.DefaultCode defaultCode,
 FieldHandler constantHandler,
 DefaultsParams params)

Code generate default handling after an optional of the correct type.

Example with fixed default value (such as Default.Int:

 headers.find(MY_HEADER)
 .map(Header::getInt) // this is expected to be part of the already generated code
 // will be generated by this method
 .orElse(42)
 

Example with mapping (when using Default.Value and a non-string type):

 headers.find(MY_HEADER)
 .map(Header::getInt) // this is expected to be part of the already generated code
  // will be generated by this method
 .orElseGet(() -> mappers.map("Default Value", GenericType.STRING, GTYPE_1, "headers"))
 

- mappers - common Mappers instance, must exist in the current class, name is provided as a parameter to this method - GTYPE_1 - genericTypeNameField provided as a parameter to this method (must be generated by caller)

Parameters:

contentBuilder - content builder that we add the code to

defaultCode - as returned by findDefault(java.util.Set, io.helidon.common.types.TypeName)

constantHandler - handler of constants

params - additional parameters, needed depending on type of the default