1 files changed, 33 insertions, 0 deletions
diff --git a/rba.tool.editor/src/rba/tool/editor/validation/validators/OnSceneValidator.xtend b/rba.tool.editor/src/rba/tool/editor/validation/validators/OnSceneValidator.xtend
new file mode 100644
index 0000000..d2b3792
--- /dev/null
+++ b/rba.tool.editor/src/rba/tool/editor/validation/validators/OnSceneValidator.xtend
@@ -0,0 +1,33 @@
+package rba.tool.editor.validation.validators
+
+import org.eclipse.xtext.validation.Check
+import org.eclipse.xtext.validation.EValidatorRegistrar
+import rba.core.ExpressionType
+import rba.core.OnScene
+import rba.core.RBACorePackage
+import rba.tool.editor.messages.Messages
+import rba.tool.editor.validation.AbstractRBAModelValidator
+
+class OnSceneValidator extends AbstractRBAModelValidator {
+
+	private String ONSCENE_OPERAND_SIZE_CHECK = Messages.ONSCENE_OPERAND_SIZE_CHECK;
+
+	private String ONSCENE_OPERAND_TYPE_CHECK = Messages.ONSCENE_OPERAND_TYPE_CHECK;
+
+	override register(EValidatorRegistrar registrar) {
+		// not needed for classes used as ComposedCheck
+	}
+
+	@Check(NORMAL)
+	def checkOnScene(OnScene onScene) {
+		if (onScene.operand.size > 1) {
+			error(ONSCENE_OPERAND_SIZE_CHECK, RBACorePackage.Literals.OPERATOR__OPERAND)
+			return;
+		}
+		var operand = onScene.operand.get(0)
+		if (operand.type != ExpressionType.SCENE) {
+			error(ONSCENE_OPERAND_TYPE_CHECK, RBACorePackage.Literals.OPERATOR__OPERAND)
+			return;
+		}
+	}
+}