org.wildfly.security.manager.action.ReplacePropertyAction Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2016 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.wildfly.security.manager.action;
import java.security.PrivilegedAction;
import java.util.Properties;
/**
* A privileged action for setting a system property only if it is set to another value.
*
* @author David M. Lloyd
*/
public final class ReplacePropertyAction implements PrivilegedAction {
private final String propertyName;
private final String value;
/**
* Construct a new instance.
*
* @param propertyName the property name to set
* @param value the value to use
*/
public ReplacePropertyAction(final String propertyName, final String value) {
this.propertyName = propertyName;
this.value = value;
}
public String run() {
final Properties properties = System.getProperties();
synchronized (properties) {
if (properties.containsKey(propertyName)) {
return (String) properties.setProperty(propertyName, value);
} else {
return null;
}
}
}
}