1 files changed, 34 insertions, 0 deletions
diff --git a/rba.tool.editor/src/rba/tool/editor/validation/validators/DisplayingContentValidator.xtend b/rba.tool.editor/src/rba/tool/editor/validation/validators/DisplayingContentValidator.xtend
new file mode 100644
index 0000000..9b2cac6
--- /dev/null
+++ b/rba.tool.editor/src/rba/tool/editor/validation/validators/DisplayingContentValidator.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.DisplayingContent
+
+class DisplayingContentValidator extends AbstractRBAModelValidator {
+
+	private String DISPLAYINGCONTENT_SIZE = Messages.DISPLAYINGCONTENT_SIZE;
+
+	private String DISPLAYINGCONTENT_TYPE = Messages.DISPLAYINGCONTENT_TYPE;
+
+	override register(EValidatorRegistrar registrar) {
+		// not needed for classes used as ComposedCheck
+	}
+
+	@Check(NORMAL)
+	def checkDisplayingContent(DisplayingContent displayingContent) {
+		if (displayingContent.operand.size > 1) {
+			error(DISPLAYINGCONTENT_SIZE, RBACorePackage.Literals.OPERATOR__OPERAND)
+			return;
+		}
+		for (operand : displayingContent.operand) {
+			if (operand.type != ExpressionType.AREA) {
+				error(DISPLAYINGCONTENT_TYPE, RBACorePackage.Literals.OPERATOR__OPERAND)
+				return;
+			}
+		}
+	}
+}