/**
* Return the value for a given name from the System Properties or the Environmental Variables.
* The former overrides the latter.
*
* @param name - the name of the System Property or Environmental Variable
* @return the value of the variable or null if it was not found
*/
public static String getEnvOrProp(String name) {
// System properties override env. variables
String envVal = System.getenv(name);
String sysPropVal = System.getProperty(name);
if (sysPropVal != null) return sysPropVal;
return envVal;
}
/** Utility routine for setting the context class loader. Returns previous class loader. */
public static ClassLoader setContextClassLoader(ClassLoader newClassLoader) {
// Can only reference final local variables from dopriveleged block
final ClassLoader classLoaderToSet = newClassLoader;
final Thread currentThread = Thread.currentThread();
ClassLoader originalClassLoader = currentThread.getContextClassLoader();
if (classLoaderToSet != originalClassLoader) {
if (System.getSecurityManager() == null) {
currentThread.setContextClassLoader(classLoaderToSet);
} else {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public java.lang.Object run() {
currentThread.setContextClassLoader(classLoaderToSet);
return null;
}
});
}
}
return originalClassLoader;
}
