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1
5 package com.tc.tomcat.session;
6
7 import org.apache.catalina.Container;
8 import org.apache.catalina.Pipeline;
9 import org.apache.catalina.Valve;
10 import org.apache.catalina.util.ServerInfo;
11
12 import java.lang.reflect.Constructor  ;
13 import java.util.HashMap ;
14 import java.util.Map ;
15
16 public class VersionHelper {
17 private static final Object [] NO_ARGS = new Object [] {};
18 private static final Class [] NO_ARGS_SIGNATURE = new Class [] {};
19
20 private static final Version TOMCAT_50 = new Version("50");
21 private static final Version TOMCAT_55 = new Version("55");
22 private static final Version CURRENT;
23
24 Map m = new HashMap ();
25
26 static {
27 String serverInfo = ServerInfo.getServerInfo();
28 serverInfo = (serverInfo == null) ? "null" : serverInfo;
29
30 int lastSlash = serverInfo.lastIndexOf("/");
31 if (lastSlash < 0 || serverInfo.endsWith("/")) { throw new AssertionError ("Cannot determine tomcat version from "
32 + serverInfo); }
33
34 String ver = serverInfo.substring(lastSlash + 1);
35
36 if (ver.startsWith("5.0")) {
37 CURRENT = TOMCAT_50;
38 } else if (ver.startsWith("5.5")) {
39 CURRENT = TOMCAT_55;
40 } else if (ver.startsWith("6.0")) {
41 CURRENT = TOMCAT_55;
42 } else {
43 throw new AssertionError ("Cannot determine tomcat version from " + serverInfo);
44 }
45 }
46
47 private VersionHelper() {
48 }
50
51 public static Valve createSessionValve() {
52 return (Valve) createObject(CURRENT, "session.SessionValve" + CURRENT.getVersion());
53 }
54
55 public static Pipeline createTerracottaPipeline(Container container) {
56 return (Pipeline) createObject(CURRENT, "TerracottaPipeline", new Class [] { Container.class },
57 new Object [] { container });
58 }
59
60 private static final Object createObject(Version version, String clazz) {
61 return createObject(version, clazz, NO_ARGS_SIGNATURE, NO_ARGS);
62 }
63
64 private static final Object createObject(Version version, String clazz, Class [] signature, Object [] params) {
65 String className = "com.tc." + version.getPackageName() + "." + clazz;
66
67 try {
68 Class c = Class.forName(className);
69 Constructor cstr = c.getDeclaredConstructor(signature);
70 return cstr.newInstance(params);
71 } catch (Exception e) {
72 Error err = new AssertionError ("Error creating instance of " + className);
73 err.initCause(e);
74 throw err;
75 }
76 }
77
78 private static class Version {
79 private final String version;
80
81 Version(String version) {
82 this.version = version;
83 }
84
85 public String getPackageName() {
86 return "tomcat" + version;
87 }
88
89 public String getVersion() {
90 return version;
91 }
92
93 public String toString() {
94 return version;
95 }
96 }
97
98 }
99 |
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