https://www.spring.io/spring-data/spring-data-commons: Global parent pom.xml to be used by Spring Data modules (Pivotal Software, Inc.) 
public interface org.springframework.data.domain.ExampleMatcher$PropertyValueTransformer extends java.util.function.Function<java.util.Optional<java.lang.Object>, java.util.Optional<java.lang.Object>>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.springframework.data.domain.ExampleMatcher$PropertyValueTransformer
  super_class: java.lang.Object
{
}
Signature: Ljava/lang/Object;Ljava/util/function/Function<Ljava/util/Optional<Ljava/lang/Object;>;Ljava/util/Optional<Ljava/lang/Object;>;>;
SourceFile: "ExampleMatcher.java"
NestHost: org.springframework.data.domain.ExampleMatcher
InnerClasses:
  public abstract PropertyValueTransformer = org.springframework.data.domain.ExampleMatcher$PropertyValueTransformer of org.springframework.data.domain.ExampleMatcher