nl.ordina.bag.etl.util.Log4jUtils.java Source code

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Here is the source code for nl.ordina.bag.etl.util.Log4jUtils.java

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/**
 * Copyright 2013 Ordina
 *
 * 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 nl.ordina.bag.etl.util;

import java.io.FileNotFoundException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;

import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.WriterAppender;
import org.apache.log4j.spi.Filter;
import org.apache.log4j.spi.LoggingEvent;

import org.springframework.util.Log4jConfigurer;

public class Log4jUtils {
    private static final class DefaultFilter extends Filter {
        private final Level level;

        private DefaultFilter(Level level) {
            this.level = level;
        }

        @Override
        public int decide(LoggingEvent event) {
            if (event.getLevel().equals(level))
                return ACCEPT;
            else
                return DENY;
        }
    }

    public static void loadConfig(String filename) throws FileNotFoundException {
        if (filename != null) {
            LogManager.resetConfiguration();
            Log4jConfigurer.initLogging(filename);
        }
    }

    public static void loadConfig(String filename, long refreshInterval) throws FileNotFoundException {
        if (filename != null) {
            LogManager.resetConfiguration();
            Log4jConfigurer.initLogging(filename, refreshInterval);
        }
    }

    public static String[] getLoggers() {
        ArrayList<String> result = new ArrayList<String>();
        for (@SuppressWarnings("unchecked")
        Enumeration<Logger> loggers = LogManager.getCurrentLoggers(); loggers.hasMoreElements();) {
            Logger logger = loggers.nextElement();
            result.add(logger.getName() + ": " + logger.getLevel());
        }
        Collections.sort(result);
        return result.toArray(new String[0]);
    }

    public static void setLogLevel(Level level) {
        LogManager.getRootLogger().setLevel(level);
    }

    public static void setLogLevel(String name, Level level) {
        Logger logger = LogManager.getLogger(name);
        if (logger != null)
            logger.setLevel(level);
    }

    public static void streamLogging(OutputStream stream) {
        streamLogging(stream, null);
    }

    public static void streamLogging(OutputStream stream, final Level level) {
        streamLogging(stream, level, null);
    }

    public static void streamLogging(OutputStream stream, final Level level, String pattern) {
        WriterAppender appender = new WriterAppender(
                pattern == null ? new PatternLayout() : new PatternLayout(pattern), stream);
        if (level != null)
            appender.addFilter(new DefaultFilter(level));
        Logger.getRootLogger().addAppender(appender);
    }

    public static void streamLogging(Writer writer) {
        streamLogging(writer, null);
    }

    public static void streamLogging(Writer writer, final Level level) {
        streamLogging(writer, level, null);
    }

    public static void streamLogging(Writer writer, final Level level, String pattern) {
        WriterAppender appender = new WriterAppender(
                pattern == null ? new PatternLayout() : new PatternLayout(pattern), writer);
        if (level != null)
            appender.addFilter(new DefaultFilter(level));
        Logger.getRootLogger().addAppender(appender);
    }

}