Class | Line # | Actions | |||||
---|---|---|---|---|---|---|---|
VelocityRenderer | 42 | 13 | 0% | 4 | 0 |
1 | /* | |
2 | * See the NOTICE file distributed with this work for additional | |
3 | * information regarding copyright ownership. | |
4 | * | |
5 | * This is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU Lesser General Public License as | |
7 | * published by the Free Software Foundation; either version 2.1 of | |
8 | * the License, or (at your option) any later version. | |
9 | * | |
10 | * This software is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this software; if not, write to the Free | |
17 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
18 | * 02110-1301 USA, or see the FSF site: http://www.fsf.org. | |
19 | */ | |
20 | package org.xwiki.icon.internal; | |
21 | ||
22 | import java.io.StringWriter; | |
23 | ||
24 | import javax.inject.Inject; | |
25 | import javax.inject.Singleton; | |
26 | ||
27 | import org.apache.velocity.VelocityContext; | |
28 | import org.xwiki.component.annotation.Component; | |
29 | import org.xwiki.icon.IconException; | |
30 | import org.xwiki.velocity.VelocityEngine; | |
31 | import org.xwiki.velocity.VelocityManager; | |
32 | import org.xwiki.velocity.XWikiVelocityException; | |
33 | ||
34 | /** | |
35 | * Internal helper to render safely any velocity code. | |
36 | * | |
37 | * @version $Id: 84d86808e5ec7bbb78c3798212ed6805a2c35627 $ | |
38 | * @since 6.4M1 | |
39 | */ | |
40 | @Component(roles = VelocityRenderer.class) | |
41 | @Singleton | |
42 | public class VelocityRenderer | |
43 | { | |
44 | @Inject | |
45 | private VelocityManager velocityManager; | |
46 | ||
47 | /** | |
48 | * Render a velocity code without messing with the document context and namespace. | |
49 | * @param code code to render | |
50 | * @return the rendered code | |
51 | * @throws IconException if problem occurs | |
52 | */ | |
53 | 2675 | public String render(String code) throws IconException |
54 | { | |
55 | // The macro namespace to use by the velocity engine, see afterwards. | |
56 | 2675 | String namespace = "IconVelocityRenderer_" + Thread.currentThread().getId(); |
57 | ||
58 | // Create the output writer | |
59 | 2675 | StringWriter output = new StringWriter(); |
60 | ||
61 | 2674 | VelocityEngine engine = null; |
62 | 2675 | try { |
63 | // Get the velocity engine | |
64 | 2674 | engine = velocityManager.getVelocityEngine(); |
65 | ||
66 | // Use a new macro namespace to prevent the code redefining existing macro. | |
67 | // We use the thread name to have a unique id. | |
68 | 2674 | engine.startedUsingMacroNamespace(namespace); |
69 | ||
70 | // Create a new VelocityContext to prevent the code creating variables in the current context. | |
71 | // See http://jira.xwiki.org/browse/XWIKI-11400. | |
72 | // We set the current context as inner context of the new one to be able to read existing variables. | |
73 | // See http://jira.xwiki.org/browse/XWIKI-11426. | |
74 | 2674 | VelocityContext context = new VelocityContext(velocityManager.getVelocityContext()); |
75 | ||
76 | // Render the code | |
77 | 2674 | if (engine.evaluate(context, output, "DefaultIconRenderer", code)) { |
78 | 2673 | return output.toString(); |
79 | } else { | |
80 | // I don't know how to check the velocity runtime log | |
81 | 1 | throw new IconException("Failed to render the icon. See the Velocity runtime log.", null); |
82 | } | |
83 | } catch (XWikiVelocityException e) { | |
84 | 1 | throw new IconException("Failed to render the icon.", e); |
85 | } finally { | |
86 | // Do not forget to close the macro namespace we have created previously | |
87 | 2675 | if (engine != null) { |
88 | 2674 | engine.stoppedUsingMacroNamespace(namespace); |
89 | } | |
90 | } | |
91 | } | |
92 | } |