From 50080c1b3ca86166bc7b219fb19611834fb4be42 Mon Sep 17 00:00:00 2001
From: "miriam.baglioni" <miriam.baglioni@isti.cnr.it>
Date: Mon, 2 Mar 2020 16:41:37 +0100
Subject: [PATCH] changed the implementation of addAll method. Before adding
 all the items in a collection, we check if the accumulator set is not empty

---
 .../src/main/java/eu/dnetlib/dhp/TypedRow.java               | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/TypedRow.java b/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/TypedRow.java
index 8ca6eb7ed..56d519509 100644
--- a/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/TypedRow.java
+++ b/dhp-workflows/dhp-propagation/src/main/java/eu/dnetlib/dhp/TypedRow.java
@@ -40,7 +40,10 @@ public class TypedRow implements Serializable {
     }
 
 
-    public void addAll(Set<String> toadd){
+    public void addAll(Collection<String> toadd){
+        if(accumulator == null){
+            accumulator = new HashSet<>();
+        }
         this.accumulator.addAll(toadd);
     }