org.threeten.bp.zone.ServiceLoaderZoneRulesInitializer.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  * Neither the name of JSR-310 nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.threeten.bp.zone

import org.portablescala.reflect._

/**
 * Try to load time zone rules from implementations via reflefction
 */
class ServiceLoaderZoneRulesInitializer extends ZoneRulesInitializer {

  override def initializeProviders(): Unit = {
    // Load via reflection the tzdb
    // find the package name dynamically to support both org.threeten.bp and java.time packages
    val packageName  = this.getClass.getName.split("\\.").init.mkString(".")
    val optClassData = Reflect.lookupInstantiatableClass(s"$packageName.TzdbZoneRulesProvider")
    optClassData
      .fold(List[ZoneRulesProvider](new DefaultTzdbZoneRulesProvider())) { c =>
        val instance = c.newInstance().asInstanceOf[ZoneRulesProvider]
        List[ZoneRulesProvider](instance)
      }
      .foreach(provider => ZoneRulesProvider.registerProvider(provider))
  }
}