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A general-purpose Scala utility library
There is a newer version: 4.6.0
/*
  ---------------------------------------------------------------------------
  This software is released under a BSD license, adapted from
  http://opensource.org/licenses/bsd-license.php

  Copyright © 2009-2016, Brian M. Clapper
  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 names "clapper.org", "Grizzled Scala Library", 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 HOLDER 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
  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  ---------------------------------------------------------------------------
*/
package grizzled.net

import java.io.InputStream
import java.net.{URL => JavaURL}

import scala.util.Try

/** Convenient Scala case-class wrapper for a `java.net.URL`. This class
  * doesn't include all the capabilities. For example, it lacks the equivalent
  * of `getContent()`, as that's better handled through other means.
  *
  * @param protocol   the protocol, if defined
  * @param host       the host, if defined
  * @param port       the port, if defined
  * @param path       the path
  * @param query      the query string, if any
  * @param userInfo   the URL's user info, if any
  * @param fragment   the fragment, if any
  */
case class URL(protocol: String,
               host:     Option[String],
               port:     Option[Int],
               path:     Option[String],
               query:    Option[String] = None,
               userInfo: Option[String] = None,
               fragment: Option[String] = None) {

  /** The underlying `java.net.URL`.
    */
  val javaURL = {
    // Get around some really odd Java URL issues by simply creating a
    // URL, then mapping it to a URL. Except that this doesn't work with
    // "jar" URLs.
    protocol match {
      case "http" | "https" | "file" | "ftp" =>
        URI(scheme   = Some(protocol),
            userInfo = userInfo,
            host     = host,
            port     = port,
            path     = path,
            query    = query,
            fragment  = fragment).javaURI.toURL
      case _ =>
        new JavaURL(protocol, host.orNull, port.getOrElse(-1), path.orNull)
    }
  }


  /** The coded authority for this URI.
    *
    * @return the authority, if any
    */
  def authority = Option(javaURL.getAuthority)

  /** Get the default port for the protocol.
    *
    * @return the default port
    */
  val defaultPort = {
    val port = javaURL.getDefaultPort
    if (port < 0) None else Some(port)
  }

  /** Open an input stream to the URL.
    *
    * @return `Success(stream)` or `Failure(Exception)`
    */
  def openStream(): Try[InputStream] = Try {
    javaURL.openStream()
  }

  /** Get the URL string representation of this URL (i.e., the string
    * you could paste into a browser). Contrast this function with
    * `toString()`, which gets the string representation of the object
    * and its fields.
    *
    * @return the string
    */
  def toExternalForm = javaURL.toExternalForm

}

/** Companion object, adding some functions that aren't available in the
  * generated one.
  */
object URL {
  /** Construct a URL from a `java.net.URL`.
    *
    * @param url the `java.net.URL`
    */
  def apply(url: java.net.URL): URL = {
    URL(protocol = url.getProtocol,
        host     = Option(url.getHost).filter(_.length > 0),
        port     = if (url.getPort < 0) None else Some(url.getPort),
        path     = Option(url.getPath).filter(_.length > 0),
        userInfo = Option(url.getUserInfo).filter(_.length > 0),
        query    = Option(url.getQuery).filter(_.length > 0),
        fragment = Option(url.getRef).filter(_.length > 0))
  }

  /** Construct a URL from a string.
    *
    * @param spec the string specification
    * @return `Success(URL)` or `Failure(Exception)`
    */
  def apply(spec: String): Try[URL] = Try { URL(new java.net.URL(spec)) }
}