SystemOutLoggingOutput.java

/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.util;

/**
 * An implementation of LoggingOutput that sends stuff to System.out
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
@SuppressWarnings({"CallToPrintStackTrace", "UseOfSystemOutOrSystemErr"})
public class SystemOutLoggingOutput implements LoggingOutput
{
    /**
     * @param base All LoggingOutput must have a constructor like this
     */
    public SystemOutLoggingOutput(Class<?> base)
    {
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#debug(java.lang.String)
     */
    public void debug(String message)
    {
        log(LEVEL_DEBUG, message, null);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#info(java.lang.String)
     */
    public void info(String message)
    {
        log(LEVEL_INFO, message, null);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#warn(java.lang.String)
     */
    public void warn(String message)
    {
        log(LEVEL_WARN, message, null);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#warn(java.lang.String, java.lang.Throwable)
     */
    public void warn(String message, Throwable th)
    {
        log(LEVEL_WARN, message, th);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#error(java.lang.String)
     */
    public void error(String message)
    {
        log(LEVEL_ERROR, message, null);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#error(java.lang.String, java.lang.Throwable)
     */
    public void error(String message, Throwable th)
    {
        log(LEVEL_ERROR, message, th);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#fatal(java.lang.String)
     */
    public void fatal(String message)
    {
        log(LEVEL_FATAL, message, null);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#fatal(java.lang.String, java.lang.Throwable)
     */
    public void fatal(String message, Throwable th)
    {
        log(LEVEL_FATAL, message, th);
    }

    /**
     * Internal log implementation.
     * @param loglevel The level to log at
     * @param message The (optional) message to log
     * @param th The (optional) exception
     */
    private static void log(int loglevel, String message, Throwable th)
    {
        if (loglevel >= level)
        {
            if (message != null)
            {
                System.out.println(message);
            }

            if (th != null)
            {
                th.printStackTrace();
            }
        }
    }

    /**
     * String version of setLevel.
     * @param logLevel One of FATAL, ERROR, WARN, INFO, DEBUG
     */
    public static void setLevel(String logLevel)
    {
        if ("FATAL".equalsIgnoreCase(logLevel))
        {
            setLevel(LEVEL_FATAL);
        }
        else if ("ERROR".equalsIgnoreCase(logLevel))
        {
            setLevel(LEVEL_ERROR);
        }
        else if ("WARN".equalsIgnoreCase(logLevel))
        {
            setLevel(LEVEL_WARN);
        }
        else if ("INFO".equalsIgnoreCase(logLevel))
        {
            setLevel(LEVEL_INFO);
        }
        else if ("DEBUG".equalsIgnoreCase(logLevel))
        {
            setLevel(LEVEL_DEBUG);
        }
        else
        {
            throw new IllegalArgumentException("Unknown log level: " + logLevel);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.util.LoggingOutput#isDebugEnabled()
     */
    public boolean isDebugEnabled()
    {
        return level == LEVEL_DEBUG;
    }

    /**
     * @param level The logging level to set.
     */
    public static void setLevel(int level)
    {
        SystemOutLoggingOutput.level = level;
    }

    /**
     * @return Returns the logging level.
     */
    public static int getLevel()
    {
        return level;
    }

    /**
     * What is the current debug level?
     */
    private static int level = LEVEL_WARN;
}