Populate model/ hierarchy

[yangtools.git] / model / yang-model-api / src / main / java / org / opendaylight / yangtools / yang / model / api / stmt / DefaultMethodHelpers.java

diff --git a/model/yang-model-api/src/main/java/org/opendaylight/yangtools/yang/model/api/stmt/DefaultMethodHelpers.java b/model/yang-model-api/src/main/java/org/opendaylight/yangtools/yang/model/api/stmt/DefaultMethodHelpers.java
new file mode 100644 (file)
index 0000000..63c4bc8
--- /dev/null
+++ b/model/yang-model-api/src/main/java/org/opendaylight/yangtools/yang/model/api/stmt/DefaultMethodHelpers.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2021 PANTHEON.tech, s.r.o. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.yang.model.api.stmt;
+
+import java.util.Optional;
+import org.eclipse.jdt.annotation.NonNull;
+
+/**
+ * Simple helper methods used in default implementations.
+ */
+final class DefaultMethodHelpers {
+    private DefaultMethodHelpers() {
+        // Hidden on purpose
+    }
+
+    static <E> @NonNull Optional<E> filterOptional(final @NonNull Class<E> type, final @NonNull Optional<?> optional) {
+        return optional.filter(type::isInstance).map(type::cast);
+    }
+}