1 files changed, 20 insertions, 0 deletions

diff --git a/src/net/gcdc/asn1/datatypes/Asn1Optional.java b/src/net/gcdc/asn1/datatypes/Asn1Optional.java
new file mode 100644
index 0000000..12865e3
--- /dev/null
+++ b/src/net/gcdc/asn1/datatypes/Asn1Optional.java
@@ -0,0 +1,20 @@
+package net.gcdc.asn1.datatypes;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Indicates that the field is OPTIONAL in ASN.1. Implemented as null. Equivalent to @Nullable.
+ *
+ * Using Optional<T> would require Manifests to capture generics (like in Gson).
+ *
+ */
+@Target({ElementType.FIELD})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface Asn1Optional {
+
+}