1 files changed, 26 insertions, 0 deletions
diff --git a/library/Director/PropertyModifier/PropertyModifierNegateBoolean.php b/library/Director/PropertyModifier/PropertyModifierNegateBoolean.php
new file mode 100644
index 0000000..e60d692
--- /dev/null
+++ b/library/Director/PropertyModifier/PropertyModifierNegateBoolean.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Icinga\Module\Director\PropertyModifier;
+
+use Icinga\Module\Director\Hook\PropertyModifierHook;
+use function ipl\Stdlib\get_php_type;
+
+class PropertyModifierNegateBoolean extends PropertyModifierHook
+{
+    public function getName()
+    {
+        return 'Negate a boolean value';
+    }
+
+    public function transform($value)
+    {
+        if ($value === null) {
+            return true;
+        }
+        if (! is_bool($value)) {
+            throw new \InvalidArgumentException('Boolean expected, got ' . get_php_type($value));
+        }
+
+        return ! $value;
+    }
+}