com.cedarsoftware.util.SystemUtilities Maven / Gradle / Ivy
package com.cedarsoftware.util;
/**
* Useful System utilities for common tasks
*
* @author John DeRegnaucourt ([email protected])
*
* Copyright (c) Cedar Software LLC
*
* 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
*
* License
*
* 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.
*/
public final class SystemUtilities
{
private SystemUtilities() {
}
/**
* Fetch value from environment variable and if not set, then fetch from
* System properties. If neither available, return null.
* @param var String key of variable to return
*/
public static String getExternalVariable(String var)
{
String value = System.getProperty(var);
if (StringUtilities.isEmpty(value))
{
value = System.getenv(var);
}
return StringUtilities.isEmpty(value) ? null : value;
}
}