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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.

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/*
 * 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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * This class is intended to be used by Logger when commons-logging is
 * available, but to not force Logger itself to depend on commons-logging so
 * Logger can catch the ClassDefNotFoundError and use other methods.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class CommonsLoggingOutput implements LoggingOutput
{
    /**
     * Create a logger specific to commons-logging
     * @param base The class to log against.
     */
    public CommonsLoggingOutput(Class base)
    {
        log = LogFactory.getLog(base);
    }

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

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

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

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

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

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

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

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

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

    private final Log log;
}