Play Framework/Scala example source code file (AssetsClassLoader.scala)

This example Play Framework source code file (AssetsClassLoader.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Play Framework (and Scala) source code examples by using tags.

All credit for the original source code belongs to Play Framework; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Play Framework tags/keywords

assetsclassloader, classloader, file, play, play framework, plugin, sbt, seq, string

The AssetsClassLoader.scala Play Framework example source code

/*
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
package play.sbtplugin.run

import sbt._

/**
 * A ClassLoader for serving assets.
 *
 * Serves assets from the given directories, at the given prefix.
 *
 * @param assets A list of assets directories, paired with the prefix they should be served from.
 */
class AssetsClassLoader(parent: ClassLoader, assets: Seq[(String, File)]) extends ClassLoader(parent) {
  override def findResource(name: String) = {
    assets.collectFirst {
      case (prefix, dir) if exists(name, prefix, dir) =>
        (dir / name.substring(prefix.length)).toURI.toURL
    }.orNull
  }

  def exists(name: String, prefix: String, dir: File) = {
    name.startsWith(prefix) && (dir / name.substring(prefix.length)).isFile
  }
}