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package com.sun.enterprise.deployment;

import java.util.Collection;
import java.util.Set;
import java.util.Vector;

/**
 * I am an ordered collection that does not allow duplicates.
 *
 * @author Danny Coward
 */

public class OrderedSet extends Vector implements Set { // FIXME by srini - can we instead change the usage to be TreeSet based?

    /**
     * Construct an empty collection.
     */
    public OrderedSet() {
    }

    /**
     * Construct an ordered set from the given collection.
     */
    public OrderedSet(Collection c) {
        this();
        this.addAll(c);
    }

    /**
     * Add the given object to the Set if it is not equal (equals()) to
     * an element already in the set.
     */
    public boolean add(T o) {
        if (o != null && !this.contains(o)) {
            return super.add(o);
        }
        return false;
    }

    /**
     * Add all the elements in the given set that are not already
     * in this ordered set.
     */
    public boolean addAll(Collection c) {
        boolean setChanged = false;
        if (c != null) {
            for (T o : c) {
                if (add(o)) {
                    setChanged = true;
                }
            }
	    }
	    return setChanged;
	}	
}