com.google.gwt.logging.client.ConsoleLogHandler.java Source code

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Here is the source code for com.google.gwt.logging.client.ConsoleLogHandler.java

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/*
 * Copyright 2010 Google Inc.
 * 
 * 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 com.google.gwt.logging.client;

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

/**
 * A Handler that prints logs to the window.console.
 * <p>
 * Note we are consciously using 'window' rather than '$wnd' to avoid issues
 * similar to http://code.google.com/p/fbug/issues/detail?id=2914
 */
public class ConsoleLogHandler extends Handler {
    Boolean supported = null;

    public ConsoleLogHandler() {
        this(new TextLogFormatter(true), Level.ALL);
    }

    public ConsoleLogHandler(Formatter formatter, Level level) {
        setFormatter(formatter);
        setLevel(level);
    }

    @Override
    public void close() {
        // No action needed
    }

    @Override
    public void flush() {
        // No action needed
    }

    @Override
    public void publish(LogRecord record) {
        if (supported == null) {
            try {
                supported = isSupported();
            } catch (Exception e) {
                supported = false;
            }
        }
        if (!supported || !isLoggable(record)) {
            return;
        }
        String msg = getFormatter().format(record);
        int val = record.getLevel().intValue();
        try {
            if (val >= Level.SEVERE.intValue()) {
                error(msg);
            } else if (val >= Level.WARNING.intValue()) {
                warn(msg);
            } else if (val >= Level.INFO.intValue()) {
                info(msg);
            } else {
                log(msg);
            }
        } catch (Exception e) {
            // hosted mode
            // e.printStackTrace();
        }
    }

    private native void error(String message) /*-{
                                              window.console.error(message);
                                              }-*/;

    private native void info(String message) /*-{
                                             window.console.info(message);
                                             }-*/;

    private native boolean isSupported() /*-{
                                         return !!window.console;
                                         }-*/;

    private native void log(String message) /*-{
                                            window.console.log(message);
                                            }-*/;

    private native void warn(String message) /*-{
                                             window.console.warn(message);
                                             }-*/;
}