package common;

import java.util.*;

@SuppressWarnings("serial")
public class OrderedProperties extends Properties {

	private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();
	
	public Enumeration<Object> keys() {
        return Collections.enumeration(this.keys);
    }
	
	public Set<Object> keySet() {
        return this.keys;
    }
	
    public Object put(Object key, Object value) {
    	this.keys.add(key);
        return super.put(key, value);
    }   
    
    public Set<String> stringPropertyNames() {
        Set<String> set = new LinkedHashSet<String>();
        for (Object key: this.keys) {
            set.add((String)key);
        }
        return set;
    }
}