Scala example source code file (SeqCharSequence.scala)

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

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

Scala tags/keywords

array, arraycharsequence, arrayindexoutofboundsexception, char, charsequence, int, seqcharsequence, use

The SeqCharSequence.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2002-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala
package runtime

import java.util.Arrays.copyOfRange

@deprecated("Use Predef.SeqCharSequence", "2.11.0")
final class SeqCharSequence(val xs: scala.collection.IndexedSeq[Char]) extends CharSequence {
  def length: Int                                     = xs.length
  def charAt(index: Int): Char                        = xs(index)
  def subSequence(start: Int, end: Int): CharSequence = new SeqCharSequence(xs.slice(start, end))
  override def toString = xs.mkString("")
}

// Still need this one since the implicit class ArrayCharSequence only converts
// a single argument.
final class ArrayCharSequence(val xs: Array[Char], start: Int, end: Int) extends CharSequence {
  // yikes
  // java.lang.VerifyError: (class: scala/runtime/ArrayCharSequence, method: <init> signature: ([C)V)
  //   Constructor must call super() or this()
  //
  // def this(xs: Array[Char]) = this(xs, 0, xs.length)

  def length: Int = math.max(0, end - start)
  def charAt(index: Int): Char = {
    if (0 <= index && index < length)
      xs(start + index)
    else throw new ArrayIndexOutOfBoundsException(index)
  }
  def subSequence(start0: Int, end0: Int): CharSequence = {
    if (start0 < 0) throw new ArrayIndexOutOfBoundsException(start0)
    else if (end0 > length) throw new ArrayIndexOutOfBoundsException(end0)
    else if (end0 <= start0) new ArrayCharSequence(xs, 0, 0)
    else {
      val newlen = end0 - start0
      val start1 = start + start0
      new ArrayCharSequence(xs, start1, start1 + newlen)
    }
  }
  override def toString = xs drop start take length mkString ""
}