/**
* 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;
}
/**
* Obtain an ObjectOutputStream that allows serialization of a graph of objects. The objects can
* be plain Serializable objects or can be converted into Serializable objects using the handler
*
* @throws IOException when the serialziation fails
* @return an ObjectOutputStream that can be used to serialize objects
*/
public ObjectOutputStream createObjectOutputStream(
final OutputStream os,
final boolean replaceObject,
final NonSerializableObjectHandler handler)
throws IOException {
// Need privileged block here because EJBObjectOutputStream
// does enableReplaceObject
ObjectOutputStream oos = null;
if (System.getSecurityManager() == null) {
oos = new EJBObjectOutputStream(os, replaceObject, handler);
} else {
try {
oos =
(ObjectOutputStream)
AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public java.lang.Object run() throws Exception {
return new EJBObjectOutputStream(os, replaceObject, handler);
}
});
} catch (PrivilegedActionException ex) {
throw (IOException) ex.getException();
}
}
return oos;
}
/**
* Obtain an ObjectInputStream that allows de-serialization of a graph of objects.
*
* @throws IOException when the de-serialziation fails
* @return an ObjectInputStream that can be used to deserialize objects
*/
public ObjectInputStream createObjectInputStream(
final InputStream is, final boolean resolveObject, final ClassLoader loader)
throws Exception {
ObjectInputStream ois = null;
if (loader != null) {
// Need privileged block here because EJBObjectInputStream
// does enableResolveObject
if (System.getSecurityManager() == null) {
ois = new EJBObjectInputStream(is, loader, resolveObject);
} else {
try {
ois =
(ObjectInputStream)
AccessController.doPrivileged(
new PrivilegedExceptionAction() {
public java.lang.Object run() throws Exception {
return new EJBObjectInputStream(is, loader, resolveObject);
}
});
} catch (PrivilegedActionException ex) {
throw (IOException) ex.getException();
}
}
} else {
ois = new ObjectInputStream(is);
}
return ois;
}
/** 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;
}