I can find answers where we have String to Enum mapping but I can't find how can I map an Enum to a String.
public class Result {
Value enumValue;
}
public enum Value {
TEST,
NO TEST
}
public class Person {
String value;
}
How can I map this ?
I tried :
@Mapping(target = "value", source = "enumValue", qualifiedByName = "mapValue")
@Named("mapValue")
default Person mapValue(final Value en) {
return Person.builder().value(en.name()).build();
}
mapstruct should support this out of the box.
So @Mapping(target = "value", source = "enumValue") should suffice.
Complete example including target/source classes:
@Mapper
public interface EnumMapper {
@Mapping( target = "value", source = "enumValue" )
Person map(Result source);
}
class Result {
private Value enumValue;
public Value getEnumValue() {
return enumValue;
}
public void setEnumValue(Value enumValue) {
this.enumValue = enumValue;
}
}
enum Value {
TEST, NO_TEST
}
class Person {
private String value;
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
This results in the following generated code:
@Generated(
value = "org.mapstruct.ap.MappingProcessor",
date = "2022-02-20T12:33:00+0100",
comments = "version: 1.5.0.Beta2, compiler: Eclipse JDT (IDE) 1.4.50.v20210914-1429, environment: Java 17.0.1 (Azul Systems, Inc.)"
)
public class EnumMapperImpl implements EnumMapper {
@Override
public Person map(Result source) {
if ( source == null ) {
return null;
}
Person person = new Person();
if ( source.getEnumValue() != null ) {
person.setValue( source.getEnumValue().name() );
}
return person;
}
}
I faced with the same issue.
But this doesn't work if your Enum isn't nested/inner class or if you need more complex logic. After generation with Mapstruct your import is invalid, so i fixed it with another approach.
default method with getting required data: default String getEnumValue(Result source) {
return source.getEnumValue().name();
}
@Mapping( target = "value", expression = "java(getEnumValue(source))")
Person map(Result source);
