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PHPJavaBridge server (soluble fork)
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/*-*- mode: Java; tab-width:8 -*-*/

package io.soluble.pjb.bridge;

/*
 * Copyright (C) 2003-2007 Jost Boekemeier
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

import java.lang.reflect.Method;

/**
 * A logger which uses the log4j default appender. Requires that log4j.jar is in the classpath.

 */
public abstract class SimpleLog4jLogger implements ILogger {
    protected LoggerProxy logger;

    protected class LoggerProxy {
        Object logger;
        protected Class priority;
        protected Object fatal, error, warn, info, debug;

        protected LoggerProxy() throws Exception {
            Class c = Class.forName("org.apache.log4j.Logger");
            Method m = c.getMethod("getLogger", new Class[]{String.class});
            logger = m.invoke(c, new Object[]{"io.soluble.pjb.bridge.JavaBridge"});
            c = priority = Class.forName("org.apache.log4j.Priority");
            fatal = c.getField("FATAL").get(c);
            error = c.getField("ERROR").get(c);
            warn = c.getField("WARN").get(c);
            info = c.getField("INFO").get(c);
            debug = c.getField("DEBUG").get(c);
        }

        private Method errorMethod;

        public synchronized void error(String string, Throwable t) throws Exception {
            if (errorMethod == null)
                errorMethod = logger.getClass().getMethod("error", new Class[]{Object.class, Throwable.class});
            errorMethod.invoke(logger, new Object[]{string, t});
        }

        private Method logMethod;

        public synchronized void log(int level, String msg) throws Exception {
            if (logMethod == null)
                logMethod = logger.getClass().getMethod("log", new Class[]{priority, Object.class});
            switch (level) {
                case 1:
                    logMethod.invoke(logger, new Object[]{fatal, msg});
                    break;
                case 2:
                    logMethod.invoke(logger, new Object[]{error, msg});
                    break;
                case 3:
                    logMethod.invoke(logger, new Object[]{info, msg});
                    break;
                case 4:
                    logMethod.invoke(logger, new Object[]{debug, msg});
                    break;
                default:
                    logMethod.invoke(logger, new Object[]{warn, msg});
                    break;
            }
        }
    }

    /**
     * Create a new log4j logger using the default appender.
     *
     * @see io.soluble.pjb.bridge.Util#setDefaultLogger(ILogger)
     */
    protected SimpleLog4jLogger() {
    }

    /**
     * {@inheritDoc}
     */
    public void printStackTrace(Throwable t) {
        try {
            logger.error("JavaBridge exception ", t);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public void log(int level, String msg) {
        try {
            logger.log(level, msg);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public void warn(String msg) {
        try {
            logger.log(-1, msg);
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
}