PackageSummaryListModel.java

/*
 *  Author:  Chris Seguin
 *
 *  This software has been developed under the copyleft
 *  rules of the GNU General Public License.  Please
 *  consult the GNU General Public License for more
 *  details about use and distribution of this software.
 */
package org.acm.seguin.uml;

import java.util.Iterator;
import java.util.TreeMap;

import javax.swing.AbstractListModel;

import org.acm.seguin.summary.PackageSummary;

/**
 *  Holds a list of packages for the list box 
 *
 *@author     Chris Seguin 
 *@created    August 11, 1999 
 */
public class PackageSummaryListModel extends AbstractListModel {
	//  Instance Variables
	private TreeMap orderedMap;
	private PackageSummary[] array;
	private boolean ready;


	/**
	 *  Constructor for the PackageSummaryListModel object 
	 */
	public PackageSummaryListModel() {
		orderedMap = new TreeMap();
		ready = false;
		array = null;
	}


	/**
	 *  Return the requested item 
	 *
	 *@param  index  the index of the item required 
	 *@return        The object 
	 */
	public Object getElementAt(int index) {
		if (!ready) {
			prepare();
		}

		return array[index];
	}


	/**
	 *  Return the number of items 
	 *
	 *@return    The size 
	 */
	public int getSize() {
		return orderedMap.size();
	}


	/**
	 *  Adds a package summary 
	 *
	 *@param  summary  the new summary 
	 */
	public void add(PackageSummary summary) {
		orderedMap.put(summary.getName(), summary);
		ready = false;
	}


	/**
	 *  Prepare to handle the incoming requests 
	 */
	private void prepare() {
		//  Check that we have enough array
		if ((array == null) || (array.length < orderedMap.size())) {
			array = new PackageSummary[orderedMap.size() + 5];
		}

		//  Load the array
		Iterator iter = orderedMap.values().iterator();
		int ndx = 0;
		while (iter.hasNext()) {
			array[ndx] = (PackageSummary) iter.next();
			ndx++;
		}

		//  Finish
		ready = true;
	}
}