Class | Line # | Actions | |||||
---|---|---|---|---|---|---|---|
ColorConverter | 50 | 15 | 0% | 9 | 2 |
1 | /** | |
2 | * This file Copyright (c) 2009-2015 Magnolia International | |
3 | * Ltd. (http://www.magnolia-cms.com). All rights reserved. | |
4 | * | |
5 | * | |
6 | * This file is dual-licensed under both the Magnolia | |
7 | * Network Agreement and the GNU General Public License. | |
8 | * You may elect to use one or the other of these licenses. | |
9 | * | |
10 | * This file is distributed in the hope that it will be | |
11 | * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the | |
12 | * implied warranty of MERCHANTABILITY or FITNESS FOR A | |
13 | * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. | |
14 | * Redistribution, except as permitted by whichever of the GPL | |
15 | * or MNA you select, is prohibited. | |
16 | * | |
17 | * 1. For the GPL license (GPL), you can redistribute and/or | |
18 | * modify this file under the terms of the GNU General | |
19 | * Public License, Version 3, as published by the Free Software | |
20 | * Foundation. You should have received a copy of the GNU | |
21 | * General Public License, Version 3 along with this program; | |
22 | * if not, write to the Free Software Foundation, Inc., 51 | |
23 | * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
24 | * | |
25 | * 2. For the Magnolia Network Agreement (MNA), this file | |
26 | * and the accompanying materials are made available under the | |
27 | * terms of the MNA which accompanies this distribution, and | |
28 | * is available at http://www.magnolia-cms.com/mna.html | |
29 | * | |
30 | * Any modifications to this file must keep this entire header | |
31 | * intact. | |
32 | * | |
33 | */ | |
34 | package info.magnolia.imaging.util; | |
35 | ||
36 | import java.awt.Color; | |
37 | import java.lang.reflect.Field; | |
38 | import java.lang.reflect.Modifier; | |
39 | import java.util.Map; | |
40 | import java.util.TreeMap; | |
41 | ||
42 | /** | |
43 | * A class that is able to convert java.lang.String instances to java.awt.Color instances. | |
44 | * It recognizes multiple String representations, such as named colors (using the {@link java.awt.Color} constants), | |
45 | * hexadecimal. | |
46 | * | |
47 | * TODO -- "r:100,g:100,b:100,a:80", "100, 100, 100, 80", ... | |
48 | * TODO - and vice-versa. | |
49 | */ | |
50 | public class ColorConverter { | |
51 | private static final Map<String, Color> namedColors = reflectivelyGetNamedColors(); | |
52 | ||
53 | 9 | public static Color toColor(String s) { |
54 | 9 | if (namedColors.containsKey(s)) { |
55 | 4 | return namedColors.get(s); |
56 | 5 | } else if (s.startsWith("#")) { |
57 | 4 | return Color.decode(s); |
58 | } else { | |
59 | 1 | throw new IllegalArgumentException("Can't decode color: " + s + ". Please provide either an #ffffff hexadecimal value or a known named color."); |
60 | } | |
61 | } | |
62 | ||
63 | /** | |
64 | * Using reflection, gather all fields of java.awt.Color that are | |
65 | * static, public, final and of type java.awt.Color, and put them | |
66 | * in them in a case-insensitive Map. | |
67 | * Since we've already loaded the java.awt.Color, there is virtually | |
68 | * no hit on performance or memory usage, except for this very small | |
69 | * map. | |
70 | * Yes, this is a bit ugly, since we're relying on how those constants | |
71 | * are declared ... but it is not very likely to change, is it ? | |
72 | */ | |
73 | 1 | private static Map<String, Color> reflectivelyGetNamedColors() { |
74 | 1 | try { |
75 | 1 | final Map<String, Color> namedColors = new TreeMap<String, Color>(String.CASE_INSENSITIVE_ORDER); |
76 | 1 | final Field[] fields = Color.class.getFields(); |
77 | 1 | for (final Field field : fields) { |
78 | 29 | int mod = field.getModifiers(); |
79 | 29 | if (Modifier.isStatic(mod) && Modifier.isPublic(mod) && Modifier.isFinal(mod)) { |
80 | 29 | if (Color.class.equals(field.getType())) { |
81 | 26 | namedColors.put(field.getName(), (Color) field.get(null)); |
82 | } | |
83 | } | |
84 | } | |
85 | 1 | return namedColors; |
86 | } catch (IllegalAccessException e) { | |
87 | 0 | throw new RuntimeException("Can't access field values of java.awt.Color, is this system too secure?", e); |
88 | } | |
89 | } | |
90 | } |