Blog post for 1.6.0.Beta2 Release

content/news/2024-05-11-mapstruct-1_6_0_Beta2-is-out.md

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+---
+title: "Conditional mapping for source parameters and much more: MapStruct 1.6.0.Beta2 is out"
+author: Filip Hrisafov
+date: "2024-05-11"
+tags: [release, news]
+---
+
+It's my pleasure to announce the second Beta release of MapStruct 1.6.
+
+The new release comes with some new functionality, e.g.:
+
+* Conditional mapping for source parameters
+* Support to access source property name in condition methods via an annotation
+
+This release is also our first release that has been fully automated using the great [JReleaser](https://jreleaser.org/).
+This would hopefully mean that we can realase more often, as the burden of manual release has been reduced.
+
+We'd like to thank our new supporters:
+
+* [Cybozu](https://github.com/cybozu)
+* [Juyoung Kim](https://github.com/kjuyoung)
+* [Lansana](https://opencollective.com/lansana)
+* [Mariselvam](https://github.com/marisnb)
+* [PRISMA European Capacity Platform GmbH](https://github.com/jan-prisma)
+* [St. Galler Kantonalbank AG](https://opencollective.com/st-galler-kantonalbank-ag)
+
+And of course thanks to our previous supporters:
+
+* [addesso SE](https://github.com/adessoSE)
+* [Bileto](https://opencollective.com/bileto)
+* [Frederik Hahne](https://opencollective.com/atomfrede)
+
+If you'd like to join this list and donate to the project MapStruct is accepting donations through [Open Collective](https://opencollective.com/mapstruct) or [GitHub](https://github.com/sponsors/mapstruct).
+
+<!--more-->
+
+Altogether, not less than [19 issues](https://github.com/mapstruct/mapstruct/issues?q=milestone%3A1.6.0.Beta2) were fixed for this release.
+
+This would not have been possible without our fantastic community of contributors:
+
+* [@dehasi](https://github.com/dehasi)
+* [@hduelme](https://github.com/hduelme)
+* [@mosesonline](https://github.com/mosesonline)
+* [@the-mgi](https://github.com/the-mgi)
+* [@wandi34](https://github.com/wandi34)
+
+* and of course seasoned MapStruct hackers [Ben Zegveld](https://github.com/Zegveld), [Oliver Erhart](https://github.com/thunderhook), [Sjaak Derksen](https://github.com/sjaakd), [Filip Hrisafov](https://github.com/filiphr).
+
+Thank you everyone for all your hard work!
+
+Enough of the pep talk, let's take a closer look at some of the new features and enhancement!
+
+### Conditional mapping for source parameters
+
+It is now possible to use custom condition checks for source parameters.
+In order to support this we have enhanced the existing `@Condition` annotation with a new attribute `appliesTo` and a new `ConditionStrategy`.
+
+By default, the `@Condition` is only applicable to properties.
+However, you co do `@Condition(appliesTo = ConditionStrategy.SOURCE_PARAMETERS)`, or use the meta annotated `@SourceParameterCondition`.
+
+e.g.
+
+{{< prettify java >}}
+public class PresenceCheckUtils {
+
+    @SourceParameterCondition
+    public static boolean isDefined(Car car) {
+        return car != null && car.getId() !+ null;
+    }
+
+}
+
+@Mapper(uses = PresenceCheckUtils.class)
+public interface CarMapper {
+
+	CarDto map(Car car);
+}
+{{< /prettify >}}
+
+Will generate something like
+
+{{< prettify java >}}
+// GENERATED CODE
+public class CarMapperImpl implements CarMapper {
+
+    @Override
+    public CarDto map(Car car) {
+        if ( !PresenceCheckUtils.isDefined( car ) ) {
+            return null;
+        }
+        // ...
+    }
+
+    // ...
+}
+{{< /prettify >}}
+
+
+### Support to access source property name in condition methods via an annotation
+
+In 1.6.0.Beta1 we added `@TargetPropertyName` which was giving access to the name of the target property.
+In this release we are adding `@SourceProeprtyName` which gives access to the name of the source property.
+
+e.g.
+
+{{< prettify java >}}
+public class HibernateUtils {
+
+    @Condition
+    public static boolean isAccessible(Customer customer, @SourcePropertyName String propertyName) {
+        return Hibernate.isPropertyInitialized(customer, propertyName);
+    }
+
+}
+
+@Mapper(uses = HibernateUtils.class)
+public interface CustomerMapper {
+
+	CustomerDto map(Customer customer);
+}
+{{< /prettify >}}
+
+Will generate something like
+
+{{< prettify java >}}
+// GENERATED CODE
+public class CustomerMapperImpl implements CustomerMapper {
+
+    @Override
+    public CustomerDto map(Customer customer) {
+        // ...
+        if ( HiberateUtils.isAccessible( customer, "computedOrders" ) ) {
+            customer.setOrders( mapOrders( customer.getComputedOrders() ) );
+        }
+        // ...
+    }
+
+    // ...
+}
+{{< /prettify >}}
+
+### Enhancements
+
+* Improve error message when using `target = "."` -  This has never been fully been supported by MapStruct, and it might have worked by accident. We are now displaying an improved error message.
+* Improve error messages for auto generated mappings - MapStruct will now show the user defined method and the mapper leading to the error.
+* Remove unnecessary casts to long in generated code.
+
+### Download
+
+This concludes our tour through MapStruct 1.6 Beta2.
+If you'd like to try out the features described above, you can fetch the new release from Maven Central using the following GAV coordinates:
+
+* Annotation JAR: [org.mapstruct:mapstruct:1.6.0.Beta2](http://search.maven.org/#artifactdetails|org.mapstruct|mapstruct|1.6.0.Beta2|jar) 
+* Annotation processor JAR: [org.mapstruct:mapstruct-processor:1.6.0.Beta2](http://search.maven.org/#artifactdetails|org.mapstruct|mapstruct-processor|1.6.0.Beta2|jar)
+
+Alternatively, you can get ZIP and TAR.GZ distribution bundles - containing all the JARs, documentation etc. - [from GitHub](https://github.com/mapstruct/mapstruct/releases/tag/1.6.0.Beta2).
+
+If you run into any trouble or would like to report a bug, feature request or similar, use the following channels to get in touch:
+
+* Get help in [GitHub Discussions](https://github.com/mapstruct/mapstruct/discussions) or [StackOverflow](https://stackoverflow.com/questions/tagged/mapstruct)
+* Report bugs and feature requests via the [issue tracker](https://github.com/mapstruct/mapstruct/issues)
+* Follow [@GetMapStruct](https://twitter.com/GetMapStruct) on Twitter