From ebb14c78ec87a45ed94786addc740142fc140546 Mon Sep 17 00:00:00 2001
From: Melissa Linkert <melissa@glencoesoftware.com>
Date: Fri, 1 May 2020 11:20:53 -0500
Subject: [PATCH] Check the value of the "bioformats2raw.layout" attribute

Fail fast if the attribute is missing or indicates an unsupported format version.
---
 .../glencoesoftware/pyramid/PyramidFromDirectoryWriter.java  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java b/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java
index ce57c09..a9a5ede 100755
--- a/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java
+++ b/src/main/java/com/glencoesoftware/pyramid/PyramidFromDirectoryWriter.java
@@ -465,6 +465,11 @@ public void initialize()
     if (n5Reader == null) {
       throw new FormatException("Could not create an N5 reader");
     }
+    Integer layoutVersion =
+      n5Reader.getAttribute("/", "bioformats2raw.layout", Integer.class);
+    if (layoutVersion == null || layoutVersion != 1) {
+      throw new FormatException("Unsupported version: " + layoutVersion);
+    }
 
     LOG.info("Creating tiled pyramid file {}", this.outputFilePath);