Fix implementation nullness guarantees

[yangtools.git] / yang / yang-data-util / src / main / java / org / opendaylight / yangtools / yang / data / util / ContainerSchemaNodes.java

diff --git a/yang/yang-data-util/src/main/java/org/opendaylight/yangtools/yang/data/util/ContainerSchemaNodes.java b/yang/yang-data-util/src/main/java/org/opendaylight/yangtools/yang/data/util/ContainerSchemaNodes.java
index 337928f7241ea38bb2b0a3485055e1d84178bfa9..8010b84fbb395a1b1b16c00a40a0d99012e54099 100644 (file)
--- a/yang/yang-data-util/src/main/java/org/opendaylight/yangtools/yang/data/util/ContainerSchemaNodes.java
+++ b/yang/yang-data-util/src/main/java/org/opendaylight/yangtools/yang/data/util/ContainerSchemaNodes.java
@@ -16,6 +16,7 @@ import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
 import java.util.Collection;
 import java.util.Optional;
+import org.eclipse.jdt.annotation.NonNull;
 import org.opendaylight.yangtools.yang.common.QName;
 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
 import org.opendaylight.yangtools.yang.model.api.AugmentationSchemaNode;
@@ -104,7 +105,7 @@ public final class ContainerSchemaNodes {
         }
 
         @Override
-        public Collection<? extends MustDefinition> getMustConstraints() {
+        public Collection<? extends @NonNull MustDefinition> getMustConstraints() {
             return ImmutableList.of();
         }