1 files changed, 26 insertions, 0 deletions
diff --git a/vespajlib/src/main/java/com/yahoo/tensor/impl/TensorAddressEmpty.java b/vespajlib/src/main/java/com/yahoo/tensor/impl/TensorAddressEmpty.java
new file mode 100644
index 00000000000..2d9cd3eed78
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/tensor/impl/TensorAddressEmpty.java
@@ -0,0 +1,26 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+package com.yahoo.tensor.impl;
+
+import com.yahoo.tensor.TensorAddress;
+
+/**
+ * 0 dimesional/empty address
+ * @author baldersheim
+ */
+final class TensorAddressEmpty extends TensorAddressAny {
+    static TensorAddress empty = new TensorAddressEmpty();
+    private TensorAddressEmpty() {}
+    @Override public int size() { return 0; }
+    @Override public long numericLabel(int i) { throw new IllegalArgumentException("Empty address with no labels"); }
+
+    @Override
+    public TensorAddress withLabel(int labelIndex, long label) {
+        throw new IllegalArgumentException("No label " + labelIndex);
+    }
+
+    @Override
+    public int hashCode() { return 0; }
+    @Override
+    public boolean equals(Object o) { return o instanceof TensorAddressEmpty; }
+}