Add Signature and Variant types.
Change-Id: I3579fb8745d7b021af7534d2f0c5a0aa6ce54518
diff --git a/src/main/java/eu/mulk/jgvariant/core/Variant.java b/src/main/java/eu/mulk/jgvariant/core/Variant.java
new file mode 100644
index 0000000..e2b4b68
--- /dev/null
+++ b/src/main/java/eu/mulk/jgvariant/core/Variant.java
@@ -0,0 +1,25 @@
+package eu.mulk.jgvariant.core;
+
+/**
+ * A dynamically typed GVariant value carrying a {@link Signature} describing its type.
+ *
+ * <p>{@link #value()} can be of one of the following types:
+ *
+ * <ul>
+ * <li>{@link Boolean}
+ * <li>{@link Byte}
+ * <li>{@link Short}
+ * <li>{@link Integer}
+ * <li>{@link Long}
+ * <li>{@link String}
+ * <li>{@link java.util.Optional} (a GVariant {@code Maybe} type)
+ * <li>{@link java.util.List} (a GVariant array)
+ * <li>{@link Object[]} (a GVariant structure)
+ * </ul>
+ *
+ * @param signature the signature describing the type of the value.
+ * @param value the value itself; one of {@link Boolean}, {@link Byte}, {@link Short}, {@link
+ * Integer}, {@link Long}, {@link String}, {@link java.util.Optional}, {@link java.util.List},
+ * {@link Object[]}.
+ */
+public record Variant(Signature signature, Object value) {}