From e127ccf077f471b6c12ab4beddd613b456a686cb Mon Sep 17 00:00:00 2001
From: Peter Powers <pmpowers@usgs.gov>
Date: Sun, 31 Jan 2021 14:50:31 -0700
Subject: [PATCH] grid model loader copies path-based rate-tree for reuse
---
.../java/gov/usgs/earthquake/nshmp/model/ModelLoader.java | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/main/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java b/src/main/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java
index f8c6756a..8a93b27a 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java
@@ -868,7 +868,12 @@ abstract class ModelLoader {
/* Expect one or more geojson polygon files. */
data.gridFeatureMap(ModelFiles.readGridFeatures(dir).orElseThrow());
- LogicTree<Path> rateTree = data.gridRateTree().orElseThrow();
+
+ /*
+ * Path based gridRateTree may be used on multiple branches; we
+ * therefore need to use a copy because graph won't support edge reuse.
+ */
+ LogicTree<Path> rateTree = MfdTrees.copy(data.gridRateTree().orElseThrow());
treeBuilder.addBranches(branch, rateTree);
for (Branch<Path> rateBranch : rateTree) {
--
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