[516669] Fix IndexOutOfBoundsException in ResourceQuery.isSrmResource

* Avoid IndexOutOfBoundsException when the resource have an empty
content

Bug: 516669
Change-Id: I4b3ca48b1407fb9851d6e236b0dad16e0d669882
Signed-off-by: Laurent Fasani <laurent.fasani@obeo.fr>

1 files changed, 3 insertions, 1 deletions

diff --git a/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/api/query/ResourceQuery.java b/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/api/query/ResourceQuery.java
index 555e9c3c6c..43f87eb7c1 100644
--- a/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/api/query/ResourceQuery.java
+++ b/plugins/org.eclipse.sirius/src/org/eclipse/sirius/business/api/query/ResourceQuery.java
@@ -13,6 +13,7 @@ package org.eclipse.sirius.business.api.query;
 import java.util.Collection;
 import java.util.Optional;
 
+import org.eclipse.emf.common.util.EList;
 import org.eclipse.emf.common.util.URI;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.resource.Resource;
@@ -116,7 +117,8 @@ public class ResourceQuery {
      * @return true if the resource is a representation resource, otherwise false.
      */
     public boolean isSrmResource() {
-        return Optional.ofNullable(resource.getContents().get(0)).filter(DRepresentation.class::isInstance).isPresent();
+        EList<EObject> contents = resource.getContents();
+        return Optional.ofNullable(contents.isEmpty() ? null : resource.getContents().get(0)).filter(DRepresentation.class::isInstance).isPresent();
     }
 
     /**