com.davidbracewell.logging.LogFormatter Maven / Gradle / Ivy

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A set of utilities and tools to speed up and ease programming in Java.
There is a newer version: 0.5
/*
 * (c) 2005 David B. Bracewell
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.davidbracewell.logging;


import com.davidbracewell.SystemInfo;
import com.davidbracewell.io.QuietIO;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.LogRecord;


/**
 *  Custom logging formatter for Espresso. 
 *
 * @author David B. Bracewell
 */
public class LogFormatter extends Formatter {

  private final DateFormat dateFormatter = new SimpleDateFormat("H:mm:ss");

  @Override
  public String format(LogRecord arg0) {
    StringBuilder msg = new StringBuilder();

    StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
    String className = null;
    int lineNumber = -1;

    Throwable thrown = arg0.getThrown();

    if (thrown == null) {
      // No Throwable so guess the class and method names
      for (int i = 1; i < stackTrace.length; i++) {
        StackTraceElement element = stackTrace[i];
        if (!element.getClassName().startsWith("com.davidbracewell.logging")
            && !element.getClassName().startsWith("java.util.logging")) {
          className = element.getClassName();
          lineNumber = element.getLineNumber();
          break;
        }
      }
    } else {
      StackTraceElement element = thrown.getStackTrace()[0];
      className = element.getClassName();
      lineNumber = element.getLineNumber();
    }

    Date date = new Date();
    date.setTime(arg0.getMillis());
    msg.append('[')
        .append(dateFormatter.format(date))
        .append("] [")
        .append(arg0.getLevel())
        .append("] ");

    if( arg0.getLevel().intValue() > Level.INFO.intValue()){
      msg.append("[")
          .append(className)
          .append(':')
          .append(lineNumber)
          .append("] ");
    }
    msg.append(MessageFormat.format(arg0.getMessage(), arg0.getParameters()));

    if (thrown != null) {
      StringWriter sw = new StringWriter();
      thrown.printStackTrace(new PrintWriter(sw));
      msg.append(sw.toString());
      QuietIO.closeQuietly(sw);
    } else {
      msg.append(SystemInfo.LINE_SEPARATOR);
    }

    return msg.toString();
  }

}//END OF LogFormatter