org.smallmind.scribe.pen.adapter.LoggingBlueprintFactory Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007 through 2024 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.adapter;

import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.ServiceLoader;
import org.smallmind.nutsnbolts.lang.StaticInitializationError;

public class LoggingBlueprintFactory {

  private static final LoggingBlueprint LOGGING_BLUEPRINT;

  static {

    Iterator blueprintsIter;

    blueprintsIter = ServiceLoader.load(LoggingBlueprint.class, Thread.currentThread().getContextClassLoader()).iterator();
    if (!blueprintsIter.hasNext()) {
      throw new StaticInitializationError("No provider found for " + LoggingBlueprint.class.getSimpleName());
    }

    LOGGING_BLUEPRINT = blueprintsIter.next();

    if (blueprintsIter.hasNext()) {

      LinkedList implementationList = new LinkedList<>();

      while (blueprintsIter.hasNext()) {
        implementationList.add(blueprintsIter.next().getClass().getName());
      }

      String[] implementations = new String[implementationList.size()];
      implementationList.toArray(implementations);

      throw new StaticInitializationError("Found conflicting service implementations(%s) %s", LoggingBlueprint.class.getSimpleName(), Arrays.toString(implementations));
    }
  }

  public static LoggingBlueprint getLoggingBlueprint () {

    return LOGGING_BLUEPRINT;
  }
}