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1
14 package org.wings.plaf;
15
16 import org.apache.commons.logging.Log;
17 import org.apache.commons.logging.LogFactory;
18 import org.wings.session.Session;
19 import org.wings.session.SessionManager;
20
21 import java.io.IOException  ;
22 import java.util.HashMap ;
23
24 public abstract class LookAndFeelFactory {
25 private final transient static Log log = LogFactory.getLog(LookAndFeelFactory.class);
26
27 private static String DEFAULT_LOOKANDFEEL_FACTORY = "org.wings.plaf.LookAndFeelFactory$Default";
28
29 private static LookAndFeelFactory factory;
30
31 public static void setLookAndFeelFactory(LookAndFeelFactory factory) {
32 LookAndFeelFactory.factory = factory;
33 }
34
35
38 public static LookAndFeelFactory getLookAndFeelFactory() {
39 if (factory == null) {
40 synchronized (LookAndFeelFactory.class) {
41 if (factory == null) {
42 String className = (String ) SessionManager.getSession().getProperty("wings.lookandfeel.factory");
43 if (className == null)
44 className = DEFAULT_LOOKANDFEEL_FACTORY;
45
46 try {
47 Class factoryClass = null;
48 try {
49 factoryClass = Class.forName(className, true,
50 Thread.currentThread()
51 .getContextClassLoader());
52 } catch (ClassNotFoundException e) {
53 factoryClass = Class.forName(className);
56 }
57 factory = (LookAndFeelFactory) factoryClass.newInstance();
58 } catch (Exception e) {
59 log.fatal("could not load wings.lookandfeel.factory: " +
60 className, e);
61 throw new RuntimeException ("could not load" +
62 " wings.lookandfeel.factory: " +
63 className +
64 "(" + e.getMessage() + ")");
65 }
66 }
67 }
68 }
69 return factory;
70 }
71
72 public abstract LookAndFeel create() throws IOException ;
73
74 static class Default extends LookAndFeelFactory {
75 private static String DEFAULT_LOOKANDFEEL = "org.wings.plaf.css.CSSLookAndFeel";
76 private static HashMap lafs = new HashMap ();
77
78
79 public LookAndFeel create()
80 throws IOException {
81 LookAndFeel laf = (LookAndFeel)lafs.get(SessionManager.getSession().getUserAgent().getBrowserType());
82 if (laf == null) {
83 synchronized (Default.class) {
84 laf = (LookAndFeel)lafs.get(SessionManager.getSession().getUserAgent().getBrowserType());
85 if (laf == null) {
86 Session session = SessionManager.getSession();
87 String lafName = (String ) session.getProperty("wings.lookandfeel.default");
88 if (lafName == null)
89 lafName = DEFAULT_LOOKANDFEEL;
90 try {
91 Class lafClass = Class.forName(lafName, true, Thread.currentThread().getContextClassLoader());
92 laf = (LookAndFeel) lafClass.newInstance();
93 } catch (Exception e) {
94 log.fatal("create", e);
95 throw new IOException (e.getMessage());
96 }
97 lafs.put(SessionManager.getSession().getUserAgent().getBrowserType(), laf);
98 }
99 }
100 }
101 return laf;
102 }
103 }
104 }
105 |
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