public static Properties getProperties(PropertyFilter filter) {
if (null == filter) {
return System.getProperties();
}
Properties ret = new Properties();
Properties props = System.getProperties();
for (String pName : props.stringPropertyNames()) {
String pValue = props.getProperty(pName);
Pair<String, String> p = Pair.of(pName, pValue);
if (filter.accept(p)) {
ret.put(p.getFirst(), p.getSecond());
}
}
return ret;
}
