Bump powsybl-core 4.4.0-RC1

pom.xml

@@ -48,7 +48,7 @@
         <junit-jupiter.version>5.5.2</junit-jupiter.version>
         <slf4jtoys.version>1.6.2</slf4jtoys.version>
 
-        <powsybl-core.version>4.3.1</powsybl-core.version>
+        <powsybl-core.version>4.4.0-RC1</powsybl-core.version>
     </properties>
 
     <build>

src/main/java/com/powsybl/openloadflow/network/impl/LfNetworkLoaderImpl.java

@@ -697,7 +697,7 @@ public Optional<List<LfNetwork>> load(Object network, LfNetworkParameters parame
 
     static boolean participateToSlackDistribution(LfNetworkParameters parameters, Bus b) {
         return parameters.getCountriesToBalance().isEmpty()
-               || b.getVoltageLevel().getSubstation().getCountry()
+               || b.getVoltageLevel().getSubstation().flatMap(Substation::getCountry)
                    .map(country -> parameters.getCountriesToBalance().contains(country))
                    .orElse(false);
     }

src/main/java/com/powsybl/openloadflow/util/NodeBreakerTraverser.java

@@ -7,6 +7,7 @@
 package com.powsybl.openloadflow.util;
 
 import com.powsybl.iidm.network.*;
+import com.powsybl.math.graph.TraverseResult;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -30,21 +31,21 @@ public NodeBreakerTraverser(Set<Switch> switchesToOpen, int initNode,
     }
 
     @Override
-    public boolean traverse(int nodeBefore, Switch sw, int nodeAfter) {
+    public TraverseResult traverse(int nodeBefore, Switch sw, int nodeAfter) {
         if (sw != null) {
             if (sw.isOpen()) {
-                return false;
+                return TraverseResult.TERMINATE_PATH;
             }
 
             if (nodeBefore == initNode && traverserStopsAtOtherStartEdges(sw, initNode)) {
                 // Switch is just after contingency and traverser stops at other start edges
                 if (isOpenable(sw)) {
                     // The traverser can stop now and no need to retain current switch
-                    return false;
+                    return TraverseResult.TERMINATE_PATH;
                 }
                 if (traverserWouldStopAfter(sw, nodeAfter)) {
                     // As the traverser would stop just after, it can stop now (without retaining current switch)
-                    return false;
+                    return TraverseResult.TERMINATE_PATH;
                 }
             }
 
@@ -54,21 +55,21 @@ public boolean traverse(int nodeBefore, Switch sw, int nodeAfter) {
                 if (traverserWouldStopAfter(sw, nodeAfter)) {
                     // Continuing traversing might lead in some cases to more retained switches, but in practice the
                     // switches after are often opened and sometimes followed by an end node
-                    return true;
+                    return TraverseResult.CONTINUE;
                 }
                 if (isEquivalentToStopAfterSwitch(sw, nodeAfter)) {
                     // Retaining the switch is equivalent to stop at the node after if the node after the switch is an end node (e.g. load or generator)
                     sw.getVoltageLevel().getNodeBreakerView().getOptionalTerminal(nodeAfter).ifPresent(traversedTerminals::add);
-                    return false;
+                    return TraverseResult.TERMINATE_PATH;
                 }
                 switchesToOpen.add(sw);
-                return false;
+                return TraverseResult.TERMINATE_PATH;
             }
         }
 
         // The traverser continues, hence nodeAfter is traversed
         nodeBreakerView.getOptionalTerminal(nodeAfter).ifPresent(traversedTerminals::add);
-        return true;
+        return TraverseResult.CONTINUE;
     }
 
     private static boolean isEquivalentToStopAfterSwitch(Switch sw, int nodeAfter) {

src/test/resources/debug-network.xiidm

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_5" id="test" caseDate="2021-04-25T13:47:34.697+02:00" forecastDistance="0" sourceFormat="code">
+<iidm:network xmlns:iidm="http://www.powsybl.org/schema/iidm/1_6" id="test" caseDate="2021-04-25T13:47:34.697+02:00" forecastDistance="0" sourceFormat="code">
     <iidm:substation id="b1_s" country="FR">
         <iidm:voltageLevel id="b1_vl" nominalV="1.0" topologyKind="BUS_BREAKER">
             <iidm:busBreakerTopology>