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/*
 *      Copyright 2005 stat4j.org
 *
 *   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 net.sourceforge.stat4j.log4j;

import net.sourceforge.stat4j.filter.LogInterceptor;
import net.sourceforge.stat4j.filter.MetricCollector;
import net.sourceforge.stat4j.util.Util;

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;


/**
 * Name:                Stat4JAppender.java
 * Date:                Sep 1, 2004
 * Description:
 * 
 * This log4j Appender is responsible for forwarding on all
 * log messages to the stat4j regexp statstic engine.
 * 
 * Logs from stat4j classes will be ignored.
 * 
 * @author Lara D'Abreo
 */
public class Stat4jAppender extends AppenderSkeleton {

        protected static String c;

        public Stat4jAppender() {

                c = Util.getCategory();

        }

        protected void append(LoggingEvent logEvent) {
                // dont scrap our own logs
                if (logEvent.categoryName.equals(c))
                        return;
                if(LogInterceptor.shouldProcessLog(logEvent.getRenderedMessage())) {
//                       direct log to metric capture mechanism
                Throwable cause = (logEvent.getThrowableInformation() == null)? null : logEvent.getThrowableInformation().getThrowable();
                        MetricCollector.getInstance().applyLog(logEvent.getRenderedMessage(), cause);
                }
        }

        public boolean requiresLayout() {
                return false;
        }

        public void close() {
                MetricCollector.getInstance().close();

        }

}