JuliToLog4jHandler.java

package com.tinkerpop.rexster.util;

import com.sun.jersey.server.impl.cdi.CDIComponentProviderFactoryInitializer;
import com.sun.jersey.server.impl.ejb.EJBComponentProviderFactoryInitilizer;
import com.sun.jersey.server.impl.managedbeans.ManagedBeanComponentProviderFactoryInitilizer;
import org.apache.log4j.Logger;
import org.apache.log4j.Priority;

import java.text.MessageFormat;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;

/**
 * A JULI (java.util.logging) handler that redirects java.util.logging messages to Log4J
 * http://wiki.apache.org/myfaces/Trinidad_and_Common_Logging
 * <br>
 * https://github.com/joshuadavis/yajul/blob/master/core/src/main/java/org/yajul/log/JuliToLog4jHandler.java
 */
public class JuliToLog4jHandler extends Handler {

    /**
     * List of loggers from Jersey/Grizzly that Rexster ignores in debug mode as they are not used in the
     * application.
     */
    private Set<String> loggersRexsterSuppresses = new HashSet<String>() {{
        add(CDIComponentProviderFactoryInitializer.class.getCanonicalName());
        add(EJBComponentProviderFactoryInitilizer.class.getCanonicalName());
        add(ManagedBeanComponentProviderFactoryInitilizer.class.getCanonicalName());
    }};

    public void publish(LogRecord record) {
        if (!loggersRexsterSuppresses.contains(record.getLoggerName())) {
            org.apache.log4j.Logger log4j = getTargetLogger(record.getLoggerName());
            Priority priority = toLog4j(record.getLevel());
            log4j.log(priority, toLog4jMessage(record), record.getThrown());
        }
    }

    static Logger getTargetLogger(String loggerName) {
        return Logger.getLogger(loggerName);
    }

    public static Logger getTargetLogger(Class clazz) {
        return getTargetLogger(clazz.getName());
    }

    private String toLog4jMessage(LogRecord record) {
        String message = record.getMessage();
        // Format message
        try {
            Object parameters[] = record.getParameters();
            if (parameters != null && parameters.length != 0) {
                // Check for the first few parameters ?
                if (message.indexOf("{0}") >= 0 ||
                        message.indexOf("{1}") >= 0 ||
                        message.indexOf("{2}") >= 0 ||
                        message.indexOf("{3}") >= 0) {
                    message = MessageFormat.format(message, parameters);
                }
            }
        }
        catch (Exception ex) {
            // ignore Exception
        }
        return message;
    }

    private org.apache.log4j.Level toLog4j(Level level) {
        LogLevel logLevel = LogLevel.toLogLevel(level);
        switch(logLevel)
        {
            case ERROR:
                return org.apache.log4j.Level.ERROR;
            case WARN:
                return org.apache.log4j.Level.WARN;
            case INFO:
                return org.apache.log4j.Level.INFO;
            case DEBUG:
                return org.apache.log4j.Level.DEBUG;
            case TRACE:
                return org.apache.log4j.Level.TRACE;
            case OFF:
            default:
                return org.apache.log4j.Level.OFF;
        }
    }

    @Override
    public void flush() {
        // nothing to do
    }

    @Override
    public void close() {
        // nothing to do
    }
}