+/*
+ * Copyright (c) 2016 Red Hat, Inc. 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.controller.md.sal.binding.test;
+
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
+
+/**
+ * {@link SchemaContext} singleton holder (static).
+ *
+ * <p>This is useful in scenarios such as unit tests, but not OSGi environments,
+ * where there is a flat classpath and thus really only one single
+ * SchemaContext.
+ *
+ * @author Michael Vorburger
+ */
+public final class SchemaContextSingleton {
+
+ private static SchemaContext staticSchemaContext;
+
+ public static synchronized SchemaContext getSchemaContext(Supplier<SchemaContext> supplier) throws Exception {
+ if (staticSchemaContext == null) {
+ staticSchemaContext = supplier.get();
+ }
+ return staticSchemaContext;
+ }
+
+ private SchemaContextSingleton() { }
+
+ @FunctionalInterface
+ public interface Supplier<T> {
+ T get() throws Exception;
+ }
+}