drools-eclipse/org.guvnor.eclipse.webdav/src/kernel/org/eclipse/webdav/internal/kernel/utils/NestedHashtable.java
public void collapse() {
        if (defaults != null) {
            Enumeration keysEnum = defaults.keys();
            while (keysEnum.hasMoreElements()) {
                Object key = keysEnum.nextElement();
                localValues.put(key, defaults.get(key));
            }
            defaults = null;
        }
    }
public void collapse() {
        if (defaults != null) {
            Enumeration keysEnum = defaults.keys();
            while (keysEnum.hasMoreElements()) {
                Object key = keysEnum.nextElement();
                localValues.put(key, defaults.get(key));
            }
            defaults = null;
        }
    }
Copy all the default values into the receiver.