LinkedProperties.java

/*******************************************************************************
 * Copyright (c) 2016 QNX Software Systems and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/
package org.eclipse.cdt.arduino.core.internal;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Properties;

public class LinkedProperties extends Properties {

	private static final long serialVersionUID = 1L;

	private final HashSet<Object> keys = new LinkedHashSet<Object>();

	public Iterable<Object> orderedKeys() {
		return Collections.list(keys());
	}

	public Enumeration<Object> keys() {
		return Collections.<Object>enumeration(keys);
	}

	public Object put(Object key, Object value) {
		keys.add(key);
		return super.put(key, value);
	}
}