danhaywood commented on code in PR #1019:
URL: https://github.com/apache/isis/pull/1019#discussion_r926786447
##########
api/applib/src/main/java/org/apache/isis/applib/services/bookmark/IdStringifier.java:
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@@ -0,0 +1,48 @@
+package org.apache.isis.applib.services.bookmark;
+
+import java.util.Optional;
+
+import lombok.Getter;
+
+/**
+ * SPI to allow other modules to extend the bookmarking mechanism.
+ *
+ * <p>
+ * Originally introduced to allow JPA CommandLog implementation use
CommandLogEntryPK for its primary key.
+ * </p>
+ */
+public interface IdStringifier<T> {
+
+ boolean handles(Class<?> candidateClass);
+
+ Class<T> getHandledClass();
+
+ String stringify(final T value);
+
+ T parse(final String stringified);
+
+ abstract class Abstract<T> implements IdStringifier<T> {
+
+ @Getter
+ private final Class<T> handledClass;
+ /**
+ * Allows for a Stringifier to handle (for example) both
<code>Integer.class</code> and <code>int.class</code>.
+ */
+ @Getter
+ private final Optional<Class<T>> primitiveClass;
Review Comment:
it was applicable, this is how it's implemented.
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