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17 package org.apache.log4j;
18
19 import java.util.Hashtable;
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21 import org.apache.log4j.spi.LoggerFactory;
22 import org.slf4j.helpers.Util;
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33 class Log4jLoggerFactory {
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36 private static Hashtable log4jLoggers = new Hashtable();
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38 private static final String LOG4J_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#log4jDelegationLoop";
39
40
41 static {
42 try {
43 Class.forName("org.slf4j.impl.Log4jLoggerFactory");
44 String part1 = "Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError. ";
45 String part2 = "See also " + LOG4J_DELEGATION_LOOP_URL
46 + " for more details.";
47
48 Util.report(part1);
49 Util.report(part2);
50 throw new IllegalStateException(part1 + part2);
51 } catch (ClassNotFoundException e) {
52
53 }
54 }
55
56 public static synchronized Logger getLogger(String name) {
57 if (log4jLoggers.containsKey(name)) {
58 return (org.apache.log4j.Logger) log4jLoggers.get(name);
59 } else {
60 Logger log4jLogger = new Logger(name);
61
62 log4jLoggers.put(name, log4jLogger);
63 return log4jLogger;
64 }
65 }
66
67 public static synchronized Logger getLogger(String name, LoggerFactory loggerFactory) {
68 if (log4jLoggers.containsKey(name)) {
69 return (org.apache.log4j.Logger) log4jLoggers.get(name);
70 } else {
71 Logger log4jLogger = loggerFactory.makeNewLoggerInstance(name);
72
73 log4jLoggers.put(name, log4jLogger);
74 return log4jLogger;
75 }
76 }
77
78 }