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1 package org.snipsnap.serialization;
2
3 import java.util.Map  ;
4 import java.util.HashMap ;
5 import java.util.Iterator ;
6 import org.radeox.util.Service;
7 import org.radeox.util.logging.Logger;
8
9
10 public class LabelSerializerFactory {
11
12
13 public LabelSerializerFactory(int outputFormat) {
14 m_outputFormat = String.valueOf(outputFormat);
15 }
16
17 public LabelSerializer createSerializerFor(String labelType) {
18 Class serClass = getClassFor(labelType);
19 if (serClass == null)
20 return null;
21 try {
22 LabelSerializer serializer = (LabelSerializer)serClass.newInstance();
23 return serializer;
24 }
25 catch (Exception e) { }
26 return null;
27 }
28
29
34 public static synchronized void addDefaultLabelSerializer(String labelType, int format, Class cls) {
35 if (s_defaultClasses == null)
36 s_defaultClasses = new HashMap ();
37 Class [] interfaces = cls.getInterfaces();
38 boolean ok = false;
39 for (int i = 0; i < interfaces.length; i++) {
40 if (interfaces[i].getName() == "org.snipsnap.serialization.LabelSerializer;") {
41 ok = true;
42 break;
43 }
44 }
45 if (!ok) {
46 Logger.debug("LabelSerializerFactory::addDefaultLabelSerializer: supplied Class does not implement LabelSerializer interface");
47 return;
48 }
49 s_defaultClasses.put(getKey(labelType, String.valueOf(format)), cls);
50 }
51
52 private Class getClassFor(String labelType) {
53 if (m_classMap.isEmpty()) loadClasses();
55 String key = getKey(labelType, m_outputFormat);
56 Class cls = (Class )m_classMap.get(key);
57 if (cls == null && s_defaultClasses != null)
58 cls = (Class )s_defaultClasses.get(key);
59 return cls;
60 }
61
62 private void loadClasses() {
63 m_classMap.clear();
64 try {
65 Iterator it = Service.providers(Class.forName("org.snipsnap.serialization.LabelSerializer"));
67 while (it.hasNext()) {
68 try {
69 LabelSerializer ls = (LabelSerializer)it.next();
70 int outputFormat = ls.getOutputFormat();
71 Iterator typesIt = ls.getSupportedLabelTypes().iterator();
72 while (typesIt.hasNext()) {
73 String key = getKey((String )typesIt.next(), m_outputFormat);
74 m_classMap.put(key, ls.getClass());
75 }
76 }
77 catch (Exception e) { }
79 }
80 }
81 catch (ClassNotFoundException e) { }
82 }
83
84 private static String getKey(String type, String m_outputFormat) {
85 return m_outputFormat + "_" + type;
86 }
87
88 private String m_outputFormat;
89 private static Map s_defaultClasses = null;
90 private Map m_classMap = new HashMap ();
91 }
92 |
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