/**

* Copyright 2011 Google Inc.

* Copyright 2013 Ronald W Hoffman

*

* 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 JavaBitcoin;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.io.Writer;

import java.text.MessageFormat;

import java.util.Date;

import java.util.logging.Formatter;

import java.util.logging.Handler;

import java.util.logging.Level;

import java.util.logging.LogRecord;

import java.util.logging.Logger;

/**

* A Java logging formatter that writes more compact output than the default.

*/

public class BriefLogFormatter extends Formatter {

/** Format used for log messages */

private static final MessageFormat messageFormat = new MessageFormat("{3,date,hh:mm:ss} {0} {1}.{2}: {4}\n{5}");

// OpenJDK made a questionable, backwards incompatible change to the Logger implementation. It internally uses

// weak references now which means simply fetching the logger and changing its configuration won't work. We must

// keep a reference to our custom logger around.

private static final Logger logger = Logger.getLogger("");

/**

* Configures JDK logging to use this class for everything

*/

public static void init() {

Handler[] handlers = logger.getHandlers();

for (Handler handler : handlers)

handler.setFormatter(new BriefLogFormatter());

}

/**

* Format the log record as follows:

*

* Date ThreadID Class Method Message ExceptionTrace

*

* The class name is shortened to the portion after the last period

*

* @param logRecord The log record

* @return The formatted string

*/

@Override

public String format(LogRecord logRecord) {

Object[] arguments = new Object[6];

arguments[0] = logRecord.getThreadID();

String fullClassName = logRecord.getSourceClassName();

int lastDot = fullClassName.lastIndexOf('.');

String className = fullClassName.substring(lastDot + 1);

arguments[1] = className;

arguments[2] = logRecord.getSourceMethodName();

arguments[3] = new Date(logRecord.getMillis());

arguments[4] = logRecord.getMessage();

if (logRecord.getThrown() != null) {

Writer result = new StringWriter();

logRecord.getThrown().printStackTrace(new PrintWriter(result));

arguments[5] = result.toString();

} else {

arguments[5] = "";

}

return messageFormat.format(arguments);

}

}