powsybl
diff --git a/‎data/crac/crac-impl/src/main/java/com/powsybl/openrao/data/crac/impl/NetworkActionImpl.java‎
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diff --git a/‎data/crac/crac-impl/src/test/java/com/powsybl/openrao/data/crac/impl/NetworkActionImplTest.java‎
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diff --git a/‎data/rao-result/rao-result-api/src/main/java/com/powsybl/openrao/data/raoresult/api/RaoResult.java‎
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diff --git a/‎data/rao-result/rao-result-api/src/main/java/com/powsybl/openrao/data/raoresult/api/RaoResultClone.java‎
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diff --git a/‎data/rao-result/rao-result-api/src/main/java/com/powsybl/openrao/data/raoresult/api/extension/CriticalCnecsResult.java‎
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diff --git a/‎data/rao-result/rao-result-api/src/test/java/com/powsybl/openrao/data/raoresult/api/MockRaoResult.java‎
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diff --git a/‎data/rao-result/rao-result-impl/src/main/java/com/powsybl/openrao/data/raoresult/impl/RaoResultImpl.java‎
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diff --git a/‎data/rao-result/rao-result-io/rao-result-json/src/main/java/com/powsybl/openrao/data/raoresult/io/json/RaoResultJsonConstants.java‎
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diff --git a/‎data/rao-result/rao-result-io/rao-result-json/src/main/java/com/powsybl/openrao/data/raoresult/io/json/RaoResultJsonUtils.java‎
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diff --git a/‎data/rao-result/rao-result-io/rao-result-json/src/main/java/com/powsybl/openrao/data/raoresult/io/json/deserializers/RaoResultDeserializer.java‎
Lines changed: 11 additions & 1 deletion b/‎data/rao-result/rao-result-io/rao-result-json/src/main/java/com/powsybl/openrao/data/raoresult/io/json/deserializers/RaoResultDeserializer.java‎
Lines changed: 11 additions & 1 deletion
@@ -99,4 +99,17 @@ public int hashCode() {
         return super.hashCode();
     }
 
+    public static NetworkAction copyWithNewId(NetworkAction networkAction, String newId) {
+        return new NetworkActionImpl(
+            newId,
+            networkAction.getName(),
+            networkAction.getOperator(),
+            networkAction.getUsageRules(),
+            networkAction.getElementaryActions(),
+            networkAction.getSpeed().orElse(null),
+            networkAction.getActivationCost().orElse(null),
+            networkAction.getNetworkElements()
+        );
+    }
+
 }
@@ -120,4 +120,16 @@ void compatibility() {
         assertFalse(crac.getNetworkAction("aligned-psts").isCompatibleWith(crac.getNetworkAction("switch-pair-and-pst")));
         assertTrue(crac.getNetworkAction("switch-pair-and-pst").isCompatibleWith(crac.getNetworkAction("switch-pair-and-pst")));
     }
+
+    @Test
+    void testCopyWithNewId() {
+        NetworkAction duplicate = NetworkActionImpl.copyWithNewId(networkAction1, "copy");
+        assertEquals("copy", duplicate.getId());
+        assertEquals("name", duplicate.getName());
+        assertEquals("operator", duplicate.getOperator());
+        assertEquals(Optional.of(10), duplicate.getSpeed());
+        assertEquals(1, duplicate.getUsageRules().size());
+        assertEquals(1, duplicate.getElementaryActions().size());
+        assertEquals(generator.getId(), duplicate.getNetworkElements().iterator().next().getId());
+    }
 }
@@ -7,6 +7,7 @@
 
 package com.powsybl.openrao.data.raoresult.api;
 
+import com.powsybl.commons.extensions.Extendable;
 import com.powsybl.commons.util.ServiceLoaderCache;
 import com.powsybl.openrao.commons.MinOrMax;
 import com.powsybl.openrao.commons.OpenRaoException;
@@ -44,7 +45,7 @@
  *
  * @author Joris Mancini {@literal <joris.mancini at rte-france.com>}
  */
-public interface RaoResult {
+public interface RaoResult extends Extendable<RaoResult> {
     String INITIAL_INSTANT_ID = "initial";
 
     /**
 
@@ -7,6 +7,7 @@
 
 package com.powsybl.openrao.data.raoresult.api;
 
+import com.powsybl.commons.extensions.AbstractExtendable;
 import com.powsybl.openrao.commons.OpenRaoException;
 import com.powsybl.openrao.commons.PhysicalParameter;
 import com.powsybl.openrao.commons.Unit;
@@ -25,7 +26,7 @@
  *  Clone that reproduces the results obtained by another RaoResult instance. It can be used to override some methods without rewriting all the implementations
  * @author Mohamed Ben Rejeb {@literal <mohamed.ben-rejeb at rte-france.com>}
  */
-public class RaoResultClone implements RaoResult {
+public class RaoResultClone extends AbstractExtendable<RaoResult> implements RaoResult {
 
     private final RaoResult raoResult;
 
 
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package com.powsybl.openrao.data.raoresult.api.extension;
+
+import com.powsybl.commons.extensions.AbstractExtension;
+import com.powsybl.openrao.data.raoresult.api.RaoResult;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * @author Roxane Chen {@literal <roxane.chen at rte-france.com>}
+ */
+public class CriticalCnecsResult extends AbstractExtension<RaoResult> {
+    Set<String> criticalCnecIds;
+
+    @Override
+    public String getName() {
+        return "critical-cnecs-result";
+    }
+
+    public CriticalCnecsResult(Set<String> criticalCnecIds) {
+        this.criticalCnecIds = criticalCnecIds;
+    }
+
+    public CriticalCnecsResult() {
+        this.criticalCnecIds = new HashSet<>();
+    }
+
+    public Set<String> getCriticalCnecIds() {
+        return criticalCnecIds;
+    }
+
+    public void setCriticalCnecIds(Set<String> criticalCnecIds) {
+        this.criticalCnecIds = criticalCnecIds;
+    }
+}
@@ -7,6 +7,7 @@
 
 package com.powsybl.openrao.data.raoresult.api;
 
+import com.powsybl.commons.extensions.AbstractExtendable;
 import com.powsybl.iidm.network.TwoSides;
 import com.powsybl.openrao.commons.PhysicalParameter;
 import com.powsybl.openrao.commons.Unit;
@@ -24,7 +25,7 @@
 /**
  * @author Thomas Bouquet {@literal <thomas.bouquet at rte-france.com>}
  */
-public class MockRaoResult implements RaoResult {
+public class MockRaoResult extends AbstractExtendable<RaoResult> implements RaoResult {
 
     private boolean wasExportSuccessful;
 
 
@@ -6,6 +6,7 @@
  */
 package com.powsybl.openrao.data.raoresult.impl;
 
+import com.powsybl.commons.extensions.AbstractExtendable;
 import com.powsybl.openrao.commons.MinOrMax;
 import com.powsybl.openrao.commons.OpenRaoException;
 import com.powsybl.openrao.commons.PhysicalParameter;
@@ -32,7 +33,7 @@
 /**
  * @author Baptiste Seguinot {@literal <baptiste.seguinot at rte-france.com>}
  */
-public class RaoResultImpl implements RaoResult {
+public class RaoResultImpl extends AbstractExtendable<RaoResult> implements RaoResult {
 
     private static final FlowCnecResult DEFAULT_FLOWCNEC_RESULT = new FlowCnecResult();
     private static final AngleCnecResult DEFAULT_ANGLECNEC_RESULT = new AngleCnecResult();
 
@@ -128,6 +128,10 @@ private RaoResultJsonConstants() {
     public static final String SECOND_PREVENTIVE_FELLBACK_TO_FIRST_PREVENTIVE_SITUATION = "Second preventive fellback to first preventive results";
     public static final String SECOND_PREVENTIVE_FELLBACK_TO_INITIAL_SITUATION = "Second preventive fellback to initial situation";
 
+    // fast rao specific field
+    public static final String FAST_RAO = "fast-rao";
+    public static final String CRITICAL_CNECS_SET = "critical-cnecs";
+
     // manipulate version
     public static int getPrimaryVersionNumber(String fullVersion) {
         return Integer.parseInt(divideVersionNumber(fullVersion)[0]);
 
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2025, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package com.powsybl.openrao.data.raoresult.io.json;
+
+import com.google.common.base.Supplier;
+import com.google.common.base.Suppliers;
+import com.powsybl.commons.extensions.Extension;
+import com.powsybl.commons.extensions.ExtensionJsonSerializer;
+import com.powsybl.commons.extensions.ExtensionProviders;
+import com.powsybl.openrao.data.raoresult.api.RaoResult;
+
+/**
+ * @author Roxane Chen {@literal <roxane.chen at rte-france.com>}
+ */
+public final class RaoResultJsonUtils {
+
+    private RaoResultJsonUtils() {
+        throw new AssertionError("Utility class should not be instantiated");
+    }
+
+    public interface ExtensionSerializer<E extends Extension<RaoResult>> extends ExtensionJsonSerializer<RaoResult, E> {
+    }
+
+    private static final Supplier<ExtensionProviders<ExtensionSerializer>> SUPPLIER =
+        Suppliers.memoize(() -> ExtensionProviders.createProvider(ExtensionSerializer.class, "rao-result"));
+
+    public static ExtensionProviders<ExtensionSerializer> getExtensionSerializers() {
+        return SUPPLIER.get();
+    }
+}
@@ -7,6 +7,8 @@
 
 package com.powsybl.openrao.data.raoresult.io.json.deserializers;
 
+import com.powsybl.commons.extensions.Extension;
+import com.powsybl.commons.json.JsonUtil;
 import com.powsybl.openrao.commons.OpenRaoException;
 import com.powsybl.openrao.data.crac.api.Crac;
 import com.powsybl.openrao.data.raoresult.api.RaoResult;
@@ -15,10 +17,13 @@
 import com.fasterxml.jackson.core.JsonToken;
 import com.fasterxml.jackson.databind.DeserializationContext;
 import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.powsybl.openrao.data.raoresult.io.json.RaoResultJsonUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
 
 import static com.powsybl.openrao.data.raoresult.io.json.RaoResultJsonConstants.*;
 import static com.powsybl.openrao.data.raoresult.io.json.deserializers.Utils.*;
@@ -47,6 +52,7 @@ public RaoResultDeserializer(Crac crac) {
     public RaoResult deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
 
         RaoResultImpl raoResult = new RaoResultImpl(crac);
+        List<Extension<RaoResult>> extensions = Collections.emptyList();
 
         String jsonFileVersion = isValid(jsonParser, raoResult);
         if (checkHeaderOnly) {
@@ -116,11 +122,15 @@ public RaoResult deserialize(JsonParser jsonParser, DeserializationContext deser
                 case RANGEACTION_RESULTS:
                     importRangeAction(jsonParser, raoResult, jsonFileVersion);
                     break;
-
+                case "extensions":
+                    jsonParser.nextToken();
+                    extensions = JsonUtil.updateExtensions(jsonParser, deserializationContext, RaoResultJsonUtils.getExtensionSerializers(), raoResult);
+                    break;
                 default:
                     throw new OpenRaoException(String.format("Cannot deserialize RaoResult: unexpected field (%s)", jsonParser.getCurrentName()));
             }
         }
+        extensions.forEach(extension -> raoResult.addExtension((Class) extension.getClass(), extension));
         return raoResult;
     }