1 files changed, 34 insertions, 0 deletions
diff --git a/rba.tool.editor/src/rba/tool/editor/validation/validators/IsVisibleValidator.xtend b/rba.tool.editor/src/rba/tool/editor/validation/validators/IsVisibleValidator.xtend
new file mode 100644
index 0000000..5d44d34
--- /dev/null
+++ b/rba.tool.editor/src/rba/tool/editor/validation/validators/IsVisibleValidator.xtend
@@ -0,0 +1,34 @@
+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.RBACorePackage
+import rba.tool.editor.messages.Messages
+import rba.tool.editor.validation.AbstractRBAModelValidator
+import rba.view.IsVisible
+
+class IsVisibleValidator extends AbstractRBAModelValidator {
+
+	private String ISVISIBLE_SIZE = Messages.ISVISIBLE_SIZE;
+
+	private String ISVISIBLE_TYPE = Messages.ISVISIBLE_TYPE;
+
+	override register(EValidatorRegistrar registrar) {
+		// not needed for classes used as ComposedCheck
+	}
+
+	@Check(NORMAL)
+	def checkIsVisible(IsVisible isVisible) {
+		if (isVisible.operand.size > 1) {
+			error(ISVISIBLE_SIZE, RBACorePackage.Literals.OPERATOR__OPERAND)
+			return;
+		}
+		for (operand : isVisible.operand) {
+			if (operand.type != ExpressionType.CONTENT) {
+				error(ISVISIBLE_TYPE, RBACorePackage.Literals.OPERATOR__OPERAND)
+				return;
+			}
+		}
+	}
+}