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Reflection Library for the Scala Programming Language

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/*
 * Scala (https://www.scala-lang.org)
 *
 * Copyright EPFL and Lightbend, Inc.
 *
 * Licensed under Apache License 2.0
 * (http://www.apache.org/licenses/LICENSE-2.0).
 *
 * See the NOTICE file distributed with this work for
 * additional information regarding copyright ownership.
 */

package scala.reflect.io

import java.io.Closeable
import java.nio
import java.nio.file.Files
import java.nio.file.spi.FileSystemProvider

import scala.jdk.CollectionConverters._

abstract class RootPath extends Closeable {
  def root: nio.file.Path
}

object RootPath {
  private lazy val jarFsProvider = FileSystemProvider.installedProviders().asScala.find(_.getScheme == "jar").getOrElse(throw new RuntimeException("No jar filesystem provider"))
  def apply(path: nio.file.Path, writable: Boolean): RootPath = {
    if (path.getFileName.toString.endsWith(".jar")) {
      val env = new java.util.HashMap[String, String]()
      if (!Files.exists(path.getParent))
        Files.createDirectories(path.getParent)
      if (writable) {
        env.put("create", "true")
        if (Files.exists(path))
          Files.delete(path)
      }
      val zipfs = jarFsProvider.newFileSystem(path, env)

      new RootPath {
        def root = zipfs.getRootDirectories.iterator().next()
        def close(): Unit = {
          zipfs.close()
        }
        override def toString: String = path.toString
      }
    } else {
      new RootPath {
        override def root: nio.file.Path = path
        override def close(): Unit = ()
        override def toString: String = path.toString
      }
    }
  }
}