/*
* Copyright 2012-2017 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
*
* http://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.boot.cli.testutil;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* Utilities for working with System properties in unit tests
*
* @author Andy Wilkinson
*/
public final class SystemProperties {
private SystemProperties() {
}
/**
* Performs the given {@code action} with the given system properties set. System
* properties are restored to their previous values once the action has run.
* @param action The action to perform
* @param systemPropertyPairs The system properties, each in the form
* {@code key:value}
*/
public static void doWithSystemProperties(Runnable action,
String... systemPropertyPairs) {
Map<String, String> originalValues = new HashMap<>();
for (String pair : systemPropertyPairs) {
String[] components = pair.split(":");
String key = components[0];
String value = components[1];
originalValues.put(key, System.setProperty(key, value));
}
try {
action.run();
}
finally {
for (Entry<String, String> entry : originalValues.entrySet()) {
if (entry.getValue() == null) {
System.clearProperty(entry.getKey());
}
else {
System.setProperty(entry.getKey(), entry.getValue());
}
}
}
}
}