#Accessors(fluent = true) from lombok and mapstruct together - java-8

Question

I have a downstream service whose beans I want to map to my beans. But there seems to be a problem with using mapstruct.
Pojo from the downstream service (whose definition i can't change)
#ToString
#Getter
#Setter
#Accessors(fluent = true)
public class PojoA {
private String stringA;
private int integer;
}
and I want to convert it to PojoB
#Setter
#Getter
#ToString
public class PojoB {
private String stringB;
private int integer;
}
Mapper Interface
#Mapper
public interface PojoMapper {
PojoMapper INSTANCE = Mappers.getMapper(PojoMapper.class);
#Mapping(source = "stringA", target = "stringB")
PojoB pojoAToPojoB(PojoA pojoA);
}
This fails as it fails to find getters as fluent remove the prefixes from the getters and,
I know mapstruct generates the implementation of the mapper interface and uses bean specifications (i.e get and set prefixes)
Is there a way to get past that?

Answer 1

As specified in the comments this is possible by writing a custom AccessorNamingStrategy which would return the name of the method as a fluent accessor.
I have written a custom builder accessor (that can be applied in your case as well), you can find it here.
On top of that there is an open PR #1373 for MapStruct which adds support for builders and in the same go it adds support for fluent chained accessors.
Your custom strategy (as proposed in the PR) can look like:
public class FluentAccessorNamingStrategy extends DefaultAccessorNamingStrategy {
#Override
public boolean isSetterMethod(ExecutableElement method) {
String methodName = method.getSimpleName().toString();
return methodName.startsWith( "set" ) && methodName.length() > 3 || isBuilderSetter( method );
}
protected boolean isBuilderSetter(ExecutableElement method) {
return method.getParameters().size() == 1 &&
!JAVA_JAVAX_PACKAGE.matcher( method.getEnclosingElement().asType().toString() ).matches() &&
method.getReturnType().toString().equals( method.getEnclosingElement().asType().toString() );
}
#Override
public String getPropertyName(ExecutableElement getterOrSetterMethod) {
String methodName = getterOrSetterMethod.getSimpleName().toString();
if ( methodName.startsWith( "is" ) || methodName.startsWith( "get" ) || methodName.startsWith( "set" ) ) {
return Introspector.decapitalize( methodName.substring( methodName.startsWith( "is" ) ? 2 : 3 ) );
}
else if ( isBuilderSetter( getterOrSetterMethod ) ) {
return methodName;
}
return Introspector.decapitalize( methodName.substring( methodName.startsWith( "is" ) ? 2 : 3 ) );
}
}
NB: This would work for fluent setters, you would need to do something extra to make it work for the fluent getters. Based on the meethod.getEnclosingElement(), which returns you the type, you would need to get the Accessors annotation check for the property and return the name of the method, otherwise you need to use the defaults.
Disclaimer: I am one of the members of the MapStruct team