DownloadsTableModel.java

import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

class DownloadsTableModel extends AbstractTableModel implements Observer {
	private static final String[] columnNames = {"URL", "Size", "Progress", "Status"};
	private static final Class[] columnClasses = {String.class, String.class, JProgressBar.class, String.class};
	private ArrayList<Download> downloadList = new ArrayList<Download>();
	
	public void addDownload(Download download) {
		download.addObserver(this);
		downloadList.add(download);
		fireTableRowsInserted(getRowCount() - 1, getRowCount() - 1);
	}

	public Download getDownload(int row) {
		return downloadList.get(row);
	}
	
	public void clearDownload(int row) {
		downloadList.remove(row);
		fireTableRowsDeleted(row, row);
	}
	
	public int getColumnCount() {
		return columnNames.length;
	}
	
	public String getColumnName(int col) {
		return columnNames[col];
	}
	
	public Class getColumnClass(int col) {
		return columnClasses[col];
	}
	
	public int getRowCount() {
		return downloadList.size();
	}
	
	public Object getValueAt(int row, int col) {
		Download download = downloadList.get(row);
		switch(col) {
			case 0: 
				return download.getUrl();
			case 1:
				int size = download.getSize();
				return (size == -1) ? "" : Integer.toString(size);
			case 2:
				return new Float(download.getProgress());
			case 3:
				return Download.STATUSES[download.getStatus()];
		}
			return "";
	}
	
	public void update(Observable o, Object arg) {
		int index = downloadList.indexOf(o);
		fireTableRowsUpdated(index, index);
	}
}