1 files changed, 45 insertions, 0 deletions
diff --git a/vespajlib/src/main/java/ai/vespa/validation/StringWrapper.java b/vespajlib/src/main/java/ai/vespa/validation/StringWrapper.java
new file mode 100644
index 00000000000..258be824ef5
--- /dev/null
+++ b/vespajlib/src/main/java/ai/vespa/validation/StringWrapper.java
@@ -0,0 +1,45 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package ai.vespa.validation;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Abstract wrapper for glorified strings, to ease adding new such wrappers.
+ *
+ * @param <T> child type
+ *
+ * @author jonmv
+ */
+public abstract class StringWrapper<T extends StringWrapper<T>> implements Comparable<T> {
+
+    private final String value;
+
+    protected StringWrapper(String value) {
+        this.value = requireNonNull(value);
+    }
+
+    public final String value() { return value; }
+
+    @Override
+    public int compareTo(T other) {
+        return value().compareTo(other.value());
+    }
+
+    @Override
+    public final boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        return value.equals(((StringWrapper<?>) o).value);
+    }
+
+    @Override
+    public final int hashCode() {
+        return value.hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return value;
+    }
+
+}