aQute.launcher.LauncherSystemProperties Maven / Gradle / Ivy
package aQute.launcher;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
class LauncherSystemProperties extends Properties {
private static final long serialVersionUID = 1L;
private final Map userSet = new HashMap<>();
LauncherSystemProperties(Properties... properties) {
for (Properties p : properties) {
for (Map.Entry e : p.entrySet()) {
super.put(e.getKey(), e.getValue());
}
}
Properties sysProps = System.getProperties();
if (sysProps instanceof LauncherSystemProperties) {
synchronized (sysProps) {
for (Map.Entry e : ((LauncherSystemProperties) sysProps).userSet.entrySet()) {
Object key = e.getKey();
Object value = e.getValue();
if (value != null) {
put(key, value);
} else {
remove(key);
}
}
}
}
}
@Override
public synchronized Object put(Object key, Object value) {
Object existing = super.put(key, value);
userSet.put(key, value);
return existing;
}
@Override
public synchronized Object remove(Object key) {
Object existing = super.remove(key);
if (existing != null) {
userSet.put(key, null);
}
return existing;
}
@Override
public synchronized void clear() {
super.clear();
userSet.clear();
}
}