1 files changed, 32 insertions, 0 deletions
diff --git a/rba.tool.editor/src/rba/tool/editor/validation/validators/IsOnValidator.xtend b/rba.tool.editor/src/rba/tool/editor/validation/validators/IsOnValidator.xtend
new file mode 100644
index 0000000..4959161
--- /dev/null
+++ b/rba.tool.editor/src/rba/tool/editor/validation/validators/IsOnValidator.xtend
@@ -0,0 +1,32 @@
+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.IsOn
+import rba.core.RBACorePackage
+import rba.tool.editor.messages.Messages
+import rba.tool.editor.validation.AbstractRBAModelValidator
+
+class IsOnValidator extends AbstractRBAModelValidator {
+
+	private String ISON_SIZE = Messages.ISON_SIZE;
+
+	private String ISON_TYPE = Messages.ISON_TYPE;
+
+	override register(EValidatorRegistrar registrar) {
+		// not needed for classes used as ComposedCheck
+	}
+
+	@Check(NORMAL)
+	def checkIsOnOperator(IsOn isOn) {
+		if (isOn.operand.size > 1) {
+			error(ISON_SIZE, RBACorePackage.Literals.OPERATOR__OPERAND, 1)
+			return;
+		}
+		if (isOn.operand.get(0).type != ExpressionType.SCENE) {
+			error(ISON_TYPE, RBACorePackage.Literals.OPERATOR__OPERAND)
+			return;
+		}
+	}
+}