1 /*
2 *
3 * Fosstrak LLRP Commander (www.fosstrak.org)
4 *
5 * Copyright (C) 2008 ETH Zurich
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <http://www.gnu.org/licenses/>
19 *
20 */
21
22 package org.fosstrak.llrp.commander.editors;
23
24 import java.util.HashMap;
25 import java.util.Iterator;
26 import java.util.Map;
27
28 import org.eclipse.swt.graphics.Color;
29 import org.eclipse.swt.graphics.RGB;
30 import org.eclipse.swt.widgets.Display;
31
32 /**
33 * A helper class for supporting the color table used in XML Editor.
34 *
35 * @author Haoning Zhang
36 * @version 1.0
37 */
38 public class ColorManager {
39
40 /**
41 * Max different colors used in the editor.
42 */
43 private final static int MAX_COLORS = 10;
44
45 /**
46 * Color table.
47 */
48 protected Map<RGB, Color> fColorTable = new HashMap<RGB, Color>(MAX_COLORS);
49
50 /**
51 * Dispose all the <code>Color</code> in the Color Table.
52 */
53 public void dispose() {
54 Iterator<Color> e = fColorTable.values().iterator();
55 while (e.hasNext())
56 e.next().dispose();
57 }
58
59 /**
60 * Get the <code>Color</code> instance by <code>RGB</code>.
61 * The color will be created when first uses.
62 *
63 * @param aRGB RGB instance
64 * @return Color instance from Color Table
65 */
66 public Color getColor(RGB aRGB) {
67 Color color = fColorTable.get(aRGB);
68 if (color == null) {
69 color = new Color(Display.getCurrent(), aRGB);
70 fColorTable.put(aRGB, color);
71 }
72 return color;
73 }
74 }