问题
Is it possible with MapStruct 1.2 to map a source property with a specific value to a specific different value in the target?
I think about something like this:
public abstract class JiraKpmMapper {
@Mappings({
@Mapping(source = "mySource.propA", target = "myTarget.propX")
})
@ValueMappings({
@ValueMapping(source = "ABC", target = "XYZ"),
@ValueMapping(source = "123", target = "789")
})
public abstract MyTarget source2Target(final MySource mySource);
}
So that when MapStruct sees during the mapping that when mySource.propA has the value "ABC" myTarget.propX needs to be set to value "XYZ" and so forth.
To be more precisely, I even want something more elaborated: The target should be a class haven three properties in which the resulting target value must be split into. For instance, if mySource.propA has the value "ABC" the target myTarget should get a value like "V01.123.456.AB". This value in turn shall be split up in a preValue, a middleValue and an endValue:
preValue = "V01"
middleValue = "123.456"
endValue = "AB"
whereby there's no property holding the complete result string.
That's why I already wrote a custom mapper and I tell the MyMapper to use it via
@Mapper(componentModel = "spring", uses = MyCustomMapper.class)
This works so far but I can't achieve it to tell the MyCustomMapper to put "V01.123.456.AB" into the target when the souzrce comes with "ABC".
回答1:
You can't really do that with MapStruct. The @ValueMapping
annotation is for mapping of Enum
(s).
In order to achieve what you are looking for you would need to do that in @BeforeMapping
or @AfterMapping
.
For example you can do something like:
@Mapper
public interface JiraKpmMapper {
@BeforeMapping
default void beforeMapping(@MappingTarget MyTarget target, MySource source) {
if (source.getPropY().equals("ABC") {
target.setPropX("V01.123.456.AB");
}
}
@Mapping(target = "propX", ignore = true) // This is now mapped in beforeMapping
MyTarget source2Target(final MySource mySource);
}
Your custom mapper then should have an @AfterMapping
. Where you would convert the propX
into your class. You can even do this as part of the @BeforeMapping
I wrote and directly create your class (or invoke the method that does the conversion from String
into a class)
回答2:
you can do something like this
@Mapping(target = "myTarget.propX",expression="java(mySource.getPropA().equals(\"Abc\")?"\"V01.123.456.AB\":\"\")")
来源:https://stackoverflow.com/questions/49067870/how-can-i-map-properties-conditionally-with-mapstruct-1-2