Slf4jLogChute.java

/**
 * 
 */
package org.minnal.utils;

import org.apache.velocity.runtime.RuntimeServices;
import org.apache.velocity.runtime.log.LogChute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author ganeshs
 *
 * FIXME: Replace this with org.apache.velocity.slf4j.Slf4jLogChute when velocity 2.0 is available
 */
public class Slf4jLogChute implements LogChute
{

    /** Property key for specifying the name for the log instance */
    public static final String LOGCHUTE_SLF4J_NAME =
        "runtime.log.logsystem.slf4j.name";

    /** Default name for the commons-logging instance */
    public static final String DEFAULT_LOG_NAME = "org.apache.velocity";


    /** the commons-logging Log instance */
    protected Logger log;


    /********** LogChute methods *************/

    public void init(RuntimeServices rs)
    {
        String name =
            (String)rs.getProperty(LOGCHUTE_SLF4J_NAME);

        if (name == null)
        {
            name = DEFAULT_LOG_NAME;
        }
        log = LoggerFactory.getLogger(name);
        log(LogChute.DEBUG_ID, "Slf4jLogChute name is '" + name + "'");
    }

    /**
     * Send a log message from Velocity.
     */
    public void log(int level, String message)
    {
        switch (level)
        {
            case LogChute.WARN_ID:
                log.warn(message);
                break;
            case LogChute.INFO_ID:
                log.info(message);
                break;
            case LogChute.TRACE_ID:
                log.trace(message);
                break;
            case LogChute.ERROR_ID:
                log.error(message);
                break;
            case LogChute.DEBUG_ID:
            default:
                log.debug(message);
                break;
        }
    }

    /**
     * Send a log message from Velocity with an error.
     */
    public void log(int level, String message, Throwable t)
    {
        switch (level)
        {
            case LogChute.WARN_ID:
                log.warn(message, t);
                break;
            case LogChute.INFO_ID:
                log.info(message, t);
                break;
            case LogChute.TRACE_ID:
                log.trace(message, t);
                break;
            case LogChute.ERROR_ID:
                log.error(message, t);
                break;
            case LogChute.DEBUG_ID:
            default:
                log.debug(message, t);
                break;
        }
    }

    /**
     * Checks whether the specified log level is enabled.
     */
    public boolean isLevelEnabled(int level)
    {
        switch (level)
        {
            case LogChute.DEBUG_ID:
                return log.isDebugEnabled();
            case LogChute.INFO_ID:
                return log.isInfoEnabled();
            case LogChute.TRACE_ID:
                return log.isTraceEnabled();
            case LogChute.WARN_ID:
                return log.isWarnEnabled();
            case LogChute.ERROR_ID:
                return log.isErrorEnabled();
            default:
                return true;
        }
    }
}