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tomoya-yokota 2018-06-28 19:52:33 +09:00 committed by sjaakd
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documentation/src/main/asciidoc/mapstruct-reference-guide.asciidoc
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@ -2017,10 +2017,10 @@ The same warnings and restrictions apply to default expressions that apply to ex
The example below demonstrates how two source properties can be mapped to one target:
.Mapping method using a default expression
===
====
[source, java, linenums]
[subs="verbatim,attributes"]
---
----
imports java.util.UUID;
@Mapper( imports = UUID.class )
@ -2031,8 +2031,8 @@ public interface SourceTargetMapper {
@Mapping(target="id", source="sourceId", defaultExpression = "java( UUID.randomUUID().toString() )")
Target sourceToTarget(Source s);
}
---
===
----
====
The example demonstrates how to use defaultExpression to set an `ID` field if the source field is null, this could be used to take the existing `sourceId` from the source object if it is set, or create a new `Id` if it isn't. Please note that the fully qualified package name is specified because MapStruct does not take care of the import of the `UUID` class (unless it’s used otherwise explicitly in the `SourceTargetMapper`). This can be resolved by defining imports on the @Mapper annotation ((see <<expressions>>).