/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package com.sun.enterprise.deployment;

import java.util.*;

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

class OrderedSet extends Vector implements Set {
    
	/** 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(Object 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 (Iterator itr = c.iterator(); itr.hasNext();) {
		    if (this.add(itr.next())) {
			setChanged = true;
		    }
		}
	    }
	    return setChanged;
	}
	
    }