org.jboss.errai.common.client.logging.handlers.ErraiConsoleLogHandler.java Source code

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Here is the source code for org.jboss.errai.common.client.logging.handlers.ErraiConsoleLogHandler.java

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/*
 * Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jboss.errai.common.client.logging.handlers;

import static org.jboss.errai.common.client.logging.util.StackTraceFormatter.getStackTraces;

import java.util.List;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.LogRecord;

import org.jboss.errai.common.client.logging.formatters.ErraiSimpleFormatter;
import org.jboss.errai.common.client.logging.util.Console;

import com.google.gwt.logging.client.ConsoleLogHandler;

/**
 * An extension of {@link ConsoleLogHandler} that uses a given {@link Formatter} and prints stack traces that Google
 * Chrome can translate with source maps.
 *
 * @author Max Barkley <mbarkley@redhat.com>
 */
public class ErraiConsoleLogHandler extends ConsoleLogHandler implements ErraiLogHandler {

    @FunctionalInterface
    private static interface LevelLogger {

        void log(String msg);

    }

    /*
     * Workaround to so that superlcass does not overwrite log level
     */
    private boolean init = false;

    public ErraiConsoleLogHandler(final Formatter formatter) {
        setFormatter(formatter);
        init = true;
    }

    public ErraiConsoleLogHandler() {
        this(new ErraiSimpleFormatter());
    }

    @Override
    public void publish(final LogRecord record) {
        if (!isLoggable(record)) {
            return;
        }
        String msg = getFormatter().format(record);
        int val = record.getLevel().intValue();
        if (val >= Level.SEVERE.intValue()) {
            error(msg, record);
        } else if (val >= Level.WARNING.intValue()) {
            warn(msg, record);
        } else if (val >= Level.INFO.intValue()) {
            info(msg, record);
        } else {
            log(msg, record);
        }
    }

    private void log(String msg, LogRecord record) {
        logWith(msg, record, m -> Console.log(m));
    }

    private void info(String msg, LogRecord record) {
        logWith(msg, record, m -> Console.info(m));
    }

    private void warn(String msg, LogRecord record) {
        logWith(msg, record, m -> Console.warn(m));
    }

    private void error(final String msg, final LogRecord record) {
        logWith(msg, record, m -> Console.error(m));
    }

    private void logWith(final String msg, final LogRecord record, final LevelLogger logger) {
        logger.log(msg);
        maybeLogException(record, logger);
    }

    private void maybeLogException(final LogRecord record, final LevelLogger logger) {
        if (record.getThrown() != null) {
            final List<String> stackTraces = getStackTraces(record.getThrown());
            for (final String stackTrace : stackTraces) {
                logger.log(stackTrace);
            }
        }
    }

    @Override
    public boolean isEnabled() {
        return !getLevel().equals(Level.OFF);
    }

    @Override
    public void setLevel(Level newLevel) {
        if (init)
            staticSetLevel(newLevel.getName());
    }

    @Override
    public Level getLevel() {
        return Level.parse(staticGetLevel());
    }

    public static native void staticSetLevel(String newLevel) /*-{
                                                              $wnd.erraiConsoleLogHandlerLevel = newLevel;
                                                              }-*/;

    public static native String staticGetLevel() /*-{
                                                 if ($wnd.erraiConsoleLogHandlerLevel === undefined) {
                                                 return "ALL";
                                                 } else {
                                                 return $wnd.erraiConsoleLogHandlerLevel;
                                                 }
                                                 }-*/;
}