feat: add a method to get the inference container of a resource

Author: rubenporras

com.avaloq.tools.ddk.xtext/src/com/avaloq/tools/ddk/xtext/modelinference/InferredModelUtil.java

@@ -18,7 +18,7 @@
 import org.eclipse.emf.ecore.resource.Resource;
 import org.eclipse.jdt.annotation.NonNull;
 import org.eclipse.jdt.annotation.Nullable;
-import org.eclipse.xtext.resource.XtextResource;
+import org.eclipse.xtext.resource.XtextResource
 
 
 /**
@@ -29,6 +29,22 @@ public class InferredModelUtil {
   protected InferredModelUtil() { // No public constructor for utility class
   }
 
+  /**
+   * Gets the inference container for the given resource.
+   *
+   * @param resource
+   *          the resource
+   * @return the inference container or {@code null} if there aren't any
+   */
+  public static @Nullable InferenceContainer getInferenceContainer(final @NonNull Resource resource) {
+    for (EObject content: resource.getContents()) {
+      if (content instanceof InferenceContainer inferenceContainer) {
+        return inferenceContainer;
+      }
+    }
+    return null;
+  }
+
   /**
    * Gets the model associations corresponding to an EObject.
    * <p>