/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* A rule for setting a system property to a value and then restoring the property to its old value.
*/
public final class SystemPropertyRule extends AbstractResourceRule {
private final Map<String, String> mProperties;
private final Map<String, String> mOriginalProperties = new HashMap<>();
private final Set<String> mOriginalNullProperties = new HashSet<>();
/**
* @param keyValuePairs map from system property keys to the values to set them to
*/
public SystemPropertyRule(Map<String, String> keyValuePairs) {
mProperties = keyValuePairs;
}
/**
* @param propertyName the name of the property to set
* @param value the value to set it to, if null un-setting the propertyName
*/
public SystemPropertyRule(String propertyName, String value) {
mProperties = new HashMap<>();
mProperties.put(propertyName, value);
}
@Override
public void before() {
for (Map.Entry<String, String> entry : mProperties.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
String prevValue = System.getProperty(key);
if (prevValue == null) {
mOriginalNullProperties.add(key);
} else {
mOriginalProperties.put(key, prevValue);
}
if (value == null) {
System.clearProperty(key);
} else {
System.setProperty(key, value);
}
}
}
@Override
public void after() {
for (Map.Entry<String, String> entry : mOriginalProperties.entrySet()) {
System.setProperty(entry.getKey(), entry.getValue());
}
for (String key : mOriginalNullProperties) {
System.clearProperty(key);
}
}
}