Combine ByteString and ByteRope

This commit is contained in:
Derek Williams 2011-06-05 14:04:18 -06:00
parent 6400ec8859
commit 9c30aea161
3 changed files with 193 additions and 149 deletions

View file

@ -9,46 +9,28 @@ import scala.collection.generic.{ CanBuildFrom, GenericCompanion }
object ByteString {
def apply(bytes: Array[Byte]): ByteString = new ByteString(bytes.clone)
def apply(bytes: Array[Byte]): ByteString = ByteString1(bytes.clone)
def apply(bytes: Byte*): ByteString = {
val ar = new Array[Byte](bytes.size)
bytes.copyToArray(ar)
new ByteString(ar)
ByteString1(ar)
}
def apply[T](bytes: T*)(implicit num: Integral[T]): ByteString =
new ByteString(bytes.map(x num.toInt(x).toByte)(collection.breakOut))
ByteString1(bytes.map(x num.toInt(x).toByte)(collection.breakOut))
def apply(bytes: ByteBuffer): ByteString = {
val ar = new Array[Byte](bytes.remaining)
bytes.get(ar)
new ByteString(ar)
ByteString1(ar)
}
def apply(string: String): ByteString = apply(string, "UTF-8")
def apply(string: String, charset: String): ByteString = new ByteString(string.getBytes(charset))
def apply(string: String, charset: String): ByteString = ByteString1(string.getBytes(charset))
def concat(xss: Traversable[Byte]*): ByteString = {
var length = 0
val li = xss.iterator
while (li.hasNext) {
length += li.next.size
}
val ar = new Array[Byte](length)
var pos = 0
val i = xss.iterator
while (i.hasNext) {
val cur = i.next
val len = cur.size
cur.copyToArray(ar, pos, len)
pos += len
}
new ByteString(ar)
}
val empty: ByteString = new ByteString(Array.empty[Byte])
val empty: ByteString = ByteString1(Array.empty[Byte])
def newBuilder: Builder[Byte, ByteString] = new ArrayBuilder.ofByte mapResult apply
@ -57,128 +39,178 @@ object ByteString {
def apply() = newBuilder
}
}
final class ByteString private (bytes: Array[Byte], startIndex: Int, endIndex: Int) extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
private def this(bytes: Array[Byte]) = this(bytes, 0, bytes.length)
override protected[this] def newBuilder = ByteString.newBuilder
def apply(idx: Int): Byte = bytes(checkRangeConvert(idx))
private def checkRangeConvert(index: Int) = {
val idx = index + startIndex
if (0 <= index && idx < endIndex)
idx
else
throw new IndexOutOfBoundsException(index.toString)
private object ByteString1 {
def apply(bytes: Array[Byte]) = new ByteString1(bytes)
}
def length: Int = endIndex - startIndex
final class ByteString1 private (bytes: Array[Byte], startIndex: Int, endIndex: Int) extends ByteString {
override def clone: ByteString = ByteString(toArray)
private def this(bytes: Array[Byte]) = this(bytes, 0, bytes.length)
def toArray: Array[Byte] = {
val ar = new Array[Byte](length)
Array.copy(bytes, startIndex, ar, 0, length)
ar
}
def apply(idx: Int): Byte = bytes(checkRangeConvert(idx))
def asByteBuffer: ByteBuffer = {
val buffer = ByteBuffer.wrap(bytes, startIndex, length).asReadOnlyBuffer
if (buffer.remaining < bytes.length) buffer.slice
else buffer
}
def toByteBuffer: ByteBuffer = ByteBuffer.wrap(toArray)
def utf8String: String = new String(bytes, "UTF-8")
def mapI(f: Byte Int): ByteString = map(f andThen (_.toByte))
override def slice(from: Int, until: Int): ByteString = {
val newStartIndex = math.max(from, 0) + startIndex
val newEndIndex = math.min(until, length) + startIndex
if (newEndIndex - newStartIndex <= 0) ByteString.empty
else new ByteString(bytes, newStartIndex, newEndIndex)
}
override def copyToArray[A >: Byte](xs: Array[A], start: Int, len: Int): Unit =
Array.copy(bytes, startIndex, xs, start, math.min(math.min(length, len), xs.length - start))
}
object ByteRope {
def apply(bytes: Array[Byte]): ByteRope = new ByteRope(Vector(ByteString(bytes)))
def apply(bytes: Byte*): ByteRope = new ByteRope(Vector(ByteString(bytes: _*)))
def apply[T](bytes: T*)(implicit num: Integral[T]): ByteRope = new ByteRope(Vector(ByteString(bytes: _*)(num)))
def apply(bytes: ByteBuffer): ByteRope = new ByteRope(Vector(ByteString(bytes)))
def apply(string: String): ByteRope = new ByteRope(Vector(ByteString(string)))
def apply(string: String, charset: String): ByteRope = new ByteRope(Vector(ByteString(string, charset)))
def empty: ByteRope = new ByteRope(Vector.empty)
def newBuilder: Builder[Byte, ByteRope] = new ArrayBuilder.ofByte mapResult apply
implicit def canBuildFrom = new CanBuildFrom[TraversableOnce[Byte], Byte, ByteRope] {
def apply(from: TraversableOnce[Byte]) = newBuilder
def apply() = newBuilder
}
}
final class ByteRope private (bytestrings: Vector[ByteString]) extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteRope] {
override protected[this] def newBuilder = ByteRope.newBuilder
def apply(idx: Int): Byte =
if (0 <= idx && idx < length) {
var pos = 0
var seen = 0
while (idx >= seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
bytestrings(pos)(idx - seen)
} else throw new IndexOutOfBoundsException(idx.toString)
val length: Int = (0 /: bytestrings)(_ + _.length)
override def slice(from: Int, until: Int): ByteRope = {
val start = math.max(from, 0)
val end = math.min(until, length)
if (end - start <= 0)
ByteRope.empty
else {
var pos = 0
var seen = 0
while (from >= seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
val startpos = pos
val startidx = start - seen
while (until > seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
val endpos = pos
val endidx = end - seen
if (startpos == endpos)
new ByteRope(Vector(bytestrings(startpos).slice(startidx, endidx)))
private def checkRangeConvert(index: Int) = {
val idx = index + startIndex
if (0 <= index && idx < endIndex)
idx
else
new ByteRope(bytestrings(startpos).drop(startpos) +: bytestrings.slice(startpos + 1, endpos) :+ bytestrings(endpos).take(endidx))
throw new IndexOutOfBoundsException(index.toString)
}
def length: Int = endIndex - startIndex
def toArray: Array[Byte] = {
val ar = new Array[Byte](length)
Array.copy(bytes, startIndex, ar, 0, length)
ar
}
override def clone: ByteString = new ByteString1(toArray)
def compact: ByteString =
if (startIndex == 0 && endIndex == bytes.length) this
else clone
def asByteBuffer: ByteBuffer = {
val buffer = ByteBuffer.wrap(bytes, startIndex, length).asReadOnlyBuffer
if (buffer.remaining < bytes.length) buffer.slice
else buffer
}
def utf8String: String =
new String(if (startIndex == 0 && endIndex == bytes.length) bytes else toArray, "UTF-8")
def ++(that: ByteString): ByteString = that match {
case b: ByteString1 ByteStrings(this, b)
case bs: ByteStrings ByteStrings(this, bs)
}
override def slice(from: Int, until: Int): ByteString = {
val newStartIndex = math.max(from, 0) + startIndex
val newEndIndex = math.min(until, length) + startIndex
if (newEndIndex <= newStartIndex) ByteString.empty
else new ByteString1(bytes, newStartIndex, newEndIndex)
}
override def copyToArray[A >: Byte](xs: Array[A], start: Int, len: Int): Unit =
Array.copy(bytes, startIndex, xs, start, math.min(math.min(length, len), xs.length - start))
}
def :+(that: ByteString): ByteRope = new ByteRope(bytestrings :+ that)
private object ByteStrings {
def apply(bytestrings: Vector[ByteString1]): ByteString = new ByteStrings(bytestrings)
def apply(b1: ByteString1, b2: ByteString1): ByteString = compare(b1, b2) match {
case 3 new ByteStrings(Vector(b1, b2))
case 2 b2
case 1 b1
case 0 ByteString.empty
}
def apply(b: ByteString1, bs: ByteStrings): ByteString = compare(b, bs) match {
case 3 new ByteStrings(b +: bs.bytestrings)
case 2 bs
case 1 b
case 0 ByteString.empty
}
def apply(bs: ByteStrings, b: ByteString1): ByteString = compare(bs, b) match {
case 3 new ByteStrings(bs.bytestrings :+ b)
case 2 b
case 1 bs
case 0 ByteString.empty
}
def apply(bs1: ByteStrings, bs2: ByteStrings): ByteString = compare(bs1, bs2) match {
case 3 new ByteStrings(bs1.bytestrings ++ bs2.bytestrings)
case 2 bs2
case 1 bs1
case 0 ByteString.empty
}
// 0: both empty, 1: 2nd empty, 2: 1st empty, 3: neither empty
def compare(b1: ByteString, b2: ByteString): Int =
if (b1.length == 0)
if (b2.length == 0) 0 else 2
else if (b2.length == 0) 1 else 3
}
final class ByteStrings private (private val bytestrings: Vector[ByteString1]) extends ByteString {
def apply(idx: Int): Byte =
if (0 <= idx && idx < length) {
var pos = 0
var seen = 0
while (idx >= seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
bytestrings(pos)(idx - seen)
} else throw new IndexOutOfBoundsException(idx.toString)
val length: Int = (0 /: bytestrings)(_ + _.length)
override def slice(from: Int, until: Int): ByteString = {
val start = math.max(from, 0)
val end = math.min(until, length)
if (end <= start)
ByteString.empty
else {
var pos = 0
var seen = 0
while (from >= seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
val startpos = pos
val startidx = start - seen
while (until > seen + bytestrings(pos).length) {
seen += bytestrings(pos).length
pos += 1
}
val endpos = pos
val endidx = end - seen
if (startpos == endpos)
bytestrings(startpos).slice(startidx, endidx)
else {
val first = bytestrings(startpos).drop(startidx).asInstanceOf[ByteString1]
val last = bytestrings(endpos).take(endidx).asInstanceOf[ByteString1]
if ((endpos - startpos) == 1)
new ByteStrings(Vector(first, last))
else
new ByteStrings(first +: bytestrings.slice(startpos + 1, endpos) :+ last)
}
}
}
def ++(that: ByteString): ByteString = that match {
case b: ByteString1 ByteStrings(this, b)
case bs: ByteStrings ByteStrings(this, bs)
}
def compact: ByteString = {
val ar = new Array[Byte](length)
var pos = 0
bytestrings foreach { b
b.copyToArray(ar, pos, b.length)
pos += b.length
}
ByteString1(ar)
}
def asByteBuffer: ByteBuffer = compact.asByteBuffer
def utf8String: String = compact.utf8String
}
def toByteString: ByteString = ByteString.concat(bytestrings: _*)
}
sealed trait ByteString extends IndexedSeq[Byte] with IndexedSeqOptimized[Byte, ByteString] {
override protected[this] def newBuilder = ByteString.newBuilder
def ++(that: ByteString): ByteString
def compact: ByteString
def asByteBuffer: ByteBuffer
def toByteBuffer: ByteBuffer = ByteBuffer.wrap(toArray)
def utf8String: String
def mapI(f: Byte Int): ByteString = map(f andThen (_.toByte))
}