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Pen Logging Interfaces
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.scribe.pen;

import java.util.concurrent.atomic.AtomicBoolean;

public class DefaultLoggerContext implements LoggerContext {

  private final AtomicBoolean filled = new AtomicBoolean(false);
  private StackTraceElement contextElement;

  private static boolean willPrime (String className) {

    return LoggerManager.isLoggingClass(className);
  }

  public boolean isFilled () {

    return filled.get();
  }

  public void fillIn () {

    setContextElement();
  }

  public String getClassName () {

    setContextElement();

    return contextElement.getClassName();
  }

  public String getMethodName () {

    setContextElement();

    return contextElement.getMethodName();
  }

  public String getFileName () {

    setContextElement();

    return contextElement.getFileName();
  }

  public boolean isNativeMethod () {

    setContextElement();

    return contextElement.isNativeMethod();
  }

  public int getLineNumber () {

    setContextElement();

    return contextElement.getLineNumber();
  }

  public void setContextElement () {

    if (!filled.get()) {
      synchronized (this) {
        if (!filled.get()) {

          boolean primed = false;

          for (StackTraceElement currentElement : Thread.currentThread().getStackTrace()) {
            if (primed) {
              if (!willPrime(currentElement.getClassName())) {
                contextElement = currentElement;
                break;
              }
            } else {
              primed = willPrime(currentElement.getClassName());
            }
          }

          if (!primed || (contextElement == null)) {
            throw new IllegalStateException("The logging call context was not found");
          }

          filled.set(true);
        }
      }
    }
  }
}