From b5b7dc210401c1a9de68aad3c7ff9212cf355bb6 Mon Sep 17 00:00:00 2001
From: Claudio Atzori <claudio.atzori@isti.cnr.it>
Date: Fri, 26 Mar 2021 12:30:00 +0100
Subject: [PATCH] [Cleaning] drop alternate identifiers with empty values

---
 .../java/eu/dnetlib/dhp/schema/oaf/CleaningFunctions.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/CleaningFunctions.java b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/CleaningFunctions.java
index afbe0cff6..6c7d3e915 100644
--- a/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/CleaningFunctions.java
+++ b/dhp-common/src/main/java/eu/dnetlib/dhp/schema/oaf/CleaningFunctions.java
@@ -152,7 +152,12 @@ public class CleaningFunctions {
 					Optional
 						.ofNullable(i.getPid())
 						.ifPresent(pid -> {
-							final Set<StructuredProperty> pids = Sets.newHashSet(pid);
+							final Set<StructuredProperty> pids = Sets
+								.newHashSet(
+									pid
+										.stream()
+										.filter(p -> StringUtils.isBlank(p.getValue()))
+										.collect(Collectors.toList()));
 							final Set<StructuredProperty> altIds = Sets.newHashSet(i.getAlternateIdentifier());
 							i.setAlternateIdentifier(Lists.newArrayList(Sets.difference(altIds, pids)));
 						});