Add abstract utility class for working with Spring Framework objects and components (beans).

spring-data-geode-test/src/main/java/org/springframework/data/gemfire/tests/util/SpringUtils.java

@@ -0,0 +1,56 @@
+/*
+ *  Copyright 2019 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ *  or implied. See the License for the specific language governing
+ *  permissions and limitations under the License.
+ */
+package org.springframework.data.gemfire.tests.util;
+
+import java.util.Optional;
+import java.util.function.Function;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.lang.Nullable;
+
+/**
+ * Abstract utility class containing functions to process Spring Framework objects and components (beans).
+ *
+ * @author John Blum
+ * @see java.util.function.Function
+ * @see org.springframework.context.ApplicationContext
+ * @see org.springframework.context.ConfigurableApplicationContext
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public abstract class SpringUtils {
+
+	public static final Function<ConfigurableApplicationContext, Boolean> APPLICATION_CONTEXT_CLOSING_FUNCTION =
+		applicationContext -> {
+
+			if (applicationContext != null) {
+				applicationContext.close();
+				return true;
+			}
+
+			return false;
+		};
+
+	public static boolean closeApplicationContext(@Nullable ApplicationContext applicationContext) {
+
+		return Optional.ofNullable(applicationContext)
+			.filter(ConfigurableApplicationContext.class::isInstance)
+			.map(ConfigurableApplicationContext.class::cast)
+			.map(APPLICATION_CONTEXT_CLOSING_FUNCTION)
+			.orElse(false);
+	}
+}