Add event listeners that get invoked if a new entry is added, removed or changed

[Thecarisma]

This will be a good alternative to native object attachment. With a listener, if an entry value changes the listener will be notified with the old value, new value, and key.

Sample listener interface

interface KonfigerEntryListener {
    abstract boolean newEntryAdded(String sectionName, String key, String value);
    abstract boolean entryRemoved(String sectionName, String key, String value);
    abstract boolean entryChanged(String sectionName, String key, String oldValue, String newValue);
}

For each of the methods if false is returned konfiger continue calling the other listeners if more than one is present then continue to do the appropriate operation else if true konfiger ignores the operation.

E.g. if a new entry is added the method newEntryAdded if the method returns false the entry is not added to the konfiger object if it returns true the entry is added to konfiger.