package org.apache.ibatis.logging;
import org.apache.ibatis.io.Resources;
import java.lang.reflect.Constructor;
public class LogFactory {
private static Constructor logConstructor;
static {
tryImplementation(new Runnable() {
public void run() {
useSlf4jLogging();
}
});
tryImplementation(new Runnable() {
public void run() {
useCommonsLogging();
}
});
tryImplementation(new Runnable() {
public void run() {
useLog4JLogging();
}
});
tryImplementation(new Runnable() {
public void run() {
useJdkLogging();
}
});
tryImplementation(new Runnable() {
public void run() {
useNoLogging();
}
});
}
public static Log getLog(Class aClass) {
try {
return (Log) logConstructor.newInstance(new Object[]{aClass});
} catch (Throwable t) {
throw new LogException("Error creating logger for class " + aClass + ". Cause: " + t, t);
}
}
public static synchronized void useSlf4jLogging() {
setImplementation("org.slf4j.LoggerFactory", "org.apache.ibatis.logging.slf4j.Slf4jImpl");
}
public static synchronized void useCommonsLogging() {
setImplementation("org.apache.commons.logging.LogFactory", "org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl");
}
public static synchronized void useLog4JLogging() {
setImplementation("org.apache.log4j.Logger", "org.apache.ibatis.logging.log4j.Log4jImpl");
}
public static synchronized void useJdkLogging() {
setImplementation("java.util.logging.Logger", "org.apache.ibatis.logging.jdk14.Jdk14LoggingImpl");
}
public static synchronized void useStdOutLogging() {
setImplementation("org.apache.ibatis.logging.stdout.StdOutImpl");
}
public static synchronized void useNoLogging() {
setImplementation("org.apache.ibatis.logging.nologging.NoLoggingImpl");
}
private static void tryImplementation(Runnable runnable) {
if (logConstructor == null) {
try {
runnable.run();
} catch (Throwable t) {
//ignore
}
}
}
private static void setImplementation(String implClassName) {
setImplementation(implClassName, implClassName);
}
private static void setImplementation(String testClassName, String implClassName) {
try {
Resources.classForName(testClassName);
Class implClass = Resources.classForName(implClassName);
logConstructor = implClass.getConstructor(new Class[]{Class.class});
} catch (Throwable t) {
throw new LogException("Error setting Log implementation. Cause: " + t, t);
}
}
}
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