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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.
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/*
 * Copyright 2006 Niclas Hedhman.
 *
 * 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.ops4j.pax.logging.jcl;

import org.apache.commons.logging.Log;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingManager;
import org.ops4j.pax.logging.PaxLoggingManagerAwareLogger;
import org.ops4j.pax.logging.spi.support.FallbackLogFactory;
import org.osgi.framework.FrameworkUtil;

/**
 * pax-logging specific {@link Log} that delegates to {@link PaxLogger} that is obtained from
 * framework specific {@link org.ops4j.pax.logging.PaxLoggingService} and eventually delegates to logging
 * implementation.
 */
public class JclLogger implements Log, PaxLoggingManagerAwareLogger {

    public static final String JCL_FQCN = JclLogger.class.getName();

    private String m_name;
    private PaxLogger m_delegate;

    public JclLogger(String name, PaxLogger delegate) {
        m_name = name;
        m_delegate = delegate;
    }

    @Override
    public void setPaxLoggingManager(PaxLoggingManager paxLoggingManager) {
        if (paxLoggingManager == null) {
            m_delegate = FallbackLogFactory.createFallbackLog(FrameworkUtil.getBundle(Log.class), m_name);
        } else {
            m_delegate = paxLoggingManager.getLogger(m_name, JCL_FQCN);
        }
    }

    // implementation of org.apache.commons.logging.Log follows.
    // no need to call isXXXEnable, as the delegated logger (PaxLogger) does it anyway

    @Override
    public boolean isDebugEnabled() {
        return m_delegate.isDebugEnabled();
    }

    @Override
    public boolean isErrorEnabled() {
        return m_delegate.isErrorEnabled();
    }

    @Override
    public boolean isFatalEnabled() {
        return m_delegate.isFatalEnabled();
    }

    @Override
    public boolean isInfoEnabled() {
        return m_delegate.isInfoEnabled();
    }

    @Override
    public boolean isTraceEnabled() {
        return m_delegate.isTraceEnabled();
    }

    @Override
    public boolean isWarnEnabled() {
        return m_delegate.isWarnEnabled();
    }

    @Override
    public void trace(Object message) {
        m_delegate.trace(message == null ? null : message.toString(), null);
    }

    @Override
    public void trace(Object message, Throwable t) {
        m_delegate.trace(message == null ? null : message.toString(), t);
    }

    @Override
    public void debug(Object message) {
        m_delegate.debug(message == null ? null : message.toString(), null);
    }

    @Override
    public void debug(Object message, Throwable t) {
        m_delegate.debug(message == null ? null : message.toString(), t);
    }

    @Override
    public void info(Object message) {
        m_delegate.inform(message == null ? null : message.toString(), null);
    }

    @Override
    public void info(Object message, Throwable t) {
        m_delegate.inform(message == null ? null : message.toString(), t);
    }

    @Override
    public void warn(Object message) {
        m_delegate.warn(message == null ? null : message.toString(), null);
    }

    @Override
    public void warn(Object message, Throwable t) {
        m_delegate.warn(message == null ? null : message.toString(), t);
    }

    @Override
    public void error(Object message) {
        m_delegate.error(message == null ? null : message.toString(), null);
    }

    @Override
    public void error(Object message, Throwable t) {
        m_delegate.error(message == null ? null : message.toString(), t);
    }

    @Override
    public void fatal(Object message) {
        m_delegate.fatal(message == null ? null : message.toString(), null);
    }

    @Override
    public void fatal(Object message, Throwable t) {
        m_delegate.fatal(message == null ? null : message.toString(), t);
    }

}