exvector.java

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package com.jme.scene.lod;

import java.util.Vector;

/**
 * <code>ExVector</code> is an Extended Vector that does not allow multiple
 * instances.
 * 
 * @author Joshua Slack
 * @version $Id: ExVector.java,v 1.10 2006/06/21 20:32:56 nca Exp $
 */

public class ExVector extends Vector<Object> {

	private static final long serialVersionUID = 1L;

	/**
	 * Basic constructor.
	 */
	public ExVector() {
		super();
	}

	/**
	 * Constructor allowing you to set initialCapacity
	 * @param initialCapacity how large of a vector to start with
	 */
	public ExVector(int initialCapacity) {
		super(initialCapacity);
	}

	/**
	 * Constructor allowing you to set initialCapacity
	 * @param initialCapacity how large of a vector to start with
	 * @param capacityIncrement how much space to add when we run low
	 */
	public ExVector(int initialCapacity, int capacityIncrement) {
		super(initialCapacity, capacityIncrement);
	}

	/**
	 * Add the given object to the vector if and only if it is not already present.
	 * @param obj Object to add
	 * @return boolean if the object was added.
	 */
	public boolean add(Object obj) {
		if (indexOf(obj) >= 0)
			return false;

		return super.add(obj);
	}

	/**
	 * Retrieve an object from this vector.
	 * @param obj the object to retrieve.  This uses indexOf to determine location
	 *            and then get(index) to retrieve it
	 * @return the object if present, null if not.
	 */
	public Object get(Object obj) {
		int i = indexOf(obj);
		if (i < 0)
			return null;
		
		return get(i);
	}
}