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6
7 package org.mule.util;
8
9 import java.net.URL;
10 import java.net.URLStreamHandler;
11 import java.net.URLStreamHandlerFactory;
12 import java.util.Collections;
13 import java.util.HashMap;
14 import java.util.Map;
15 import java.util.StringTokenizer;
16
17 import org.apache.commons.logging.Log;
18 import org.apache.commons.logging.LogFactory;
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29
30
31 public class MuleUrlStreamHandlerFactory extends Object implements URLStreamHandlerFactory
32 {
33
34 private static final String HANDLER_PKGS_SYSTEM_PROPERTY = "java.protocol.handler.pkgs";
35 private static final Log log = LogFactory.getLog(MuleUrlStreamHandlerFactory.class);
36
37 private static Map registry = Collections.synchronizedMap(new HashMap());
38
39
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43
44
45
46 public static synchronized void installUrlStreamHandlerFactory()
47 {
48
49
50
51
52
53
54
55
56
57 try
58 {
59 URL.setURLStreamHandlerFactory(new MuleUrlStreamHandlerFactory());
60 }
61 catch (Error err)
62 {
63 if (log.isDebugEnabled())
64 {
65 log.debug("Custom MuleUrlStreamHandlerFactory already registered", err);
66 }
67 }
68 }
69
70 public static void registerHandler(String protocol, URLStreamHandler handler)
71 {
72 registry.put(protocol, handler);
73 }
74
75 public URLStreamHandler createURLStreamHandler(String protocol)
76 {
77 URLStreamHandler handler = (URLStreamHandler) registry.get(protocol);
78 if (handler == null)
79 {
80 handler = this.defaultHandlerCreateStrategy(protocol);
81 }
82 return handler;
83 }
84
85 private URLStreamHandler defaultHandlerCreateStrategy(String protocol)
86 {
87 String packagePrefixList = System.getProperty(HANDLER_PKGS_SYSTEM_PROPERTY, "");
88
89 if (packagePrefixList.endsWith("|") == false)
90 {
91 packagePrefixList += "|sun.net.www.protocol";
92 }
93
94 StringTokenizer tokenizer = new StringTokenizer(packagePrefixList, "|");
95
96 URLStreamHandler handler = null;
97 while (handler == null && tokenizer.hasMoreTokens())
98 {
99 String packagePrefix = tokenizer.nextToken().trim();
100 String className = packagePrefix + "." + protocol + ".Handler";
101 try
102 {
103 handler = (URLStreamHandler) ClassUtils.instanciateClass(className);
104 }
105 catch (Exception ex)
106 {
107
108 }
109 }
110
111 return handler;
112 }
113 }