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package java.nio.charset
import scala.annotation.{switch, tailrec}
import java.nio._
abstract class CharsetDecoder protected (cs: Charset,
_averageCharsPerByte: Float, _maxCharsPerByte: Float) {
import CharsetDecoder._
// Config
private[this] var _replacement: String = "\uFFFD"
private[this] var _malformedInputAction: CodingErrorAction =
CodingErrorAction.REPORT
private[this] var _unmappableCharacterAction: CodingErrorAction =
CodingErrorAction.REPORT
// Status
private[this] var status: Int = INIT
// Methods
final def charset(): Charset = cs
final def replacement(): String = _replacement
final def replaceWith(newReplacement: String): CharsetDecoder = {
if (newReplacement == null || newReplacement == "")
throw new IllegalArgumentException("Invalid replacement: "+newReplacement)
if (newReplacement.length > maxCharsPerByte)
throw new IllegalArgumentException(
"Replacement string cannot be longer than maxCharsPerByte")
_replacement = newReplacement
implReplaceWith(newReplacement)
this
}
protected def implReplaceWith(newReplacement: String): Unit = ()
def malformedInputAction(): CodingErrorAction = _malformedInputAction
final def onMalformedInput(newAction: CodingErrorAction): CharsetDecoder = {
if (newAction == null)
throw new IllegalArgumentException("null CodingErrorAction")
_malformedInputAction = newAction
implOnMalformedInput(newAction)
this
}
protected def implOnMalformedInput(newAction: CodingErrorAction): Unit = ()
def unmappableCharacterAction(): CodingErrorAction = _unmappableCharacterAction
final def onUnmappableCharacter(newAction: CodingErrorAction): CharsetDecoder = {
if (newAction == null)
throw new IllegalArgumentException("null CodingErrorAction")
_unmappableCharacterAction = newAction
implOnUnmappableCharacter(newAction)
this
}
protected def implOnUnmappableCharacter(newAction: CodingErrorAction): Unit = ()
final def averageCharsPerByte(): Float = _averageCharsPerByte
final def maxCharsPerByte(): Float = _maxCharsPerByte
final def decode(in: ByteBuffer, out: CharBuffer,
endOfInput: Boolean): CoderResult = {
if (status == FLUSHED || (!endOfInput && status == END))
throw new IllegalStateException
status = if (endOfInput) END else ONGOING
@inline
@tailrec
def loop(): CoderResult = {
val result1 = try {
decodeLoop(in, out)
} catch {
case ex: BufferOverflowException =>
throw new CoderMalfunctionError(ex)
case ex: BufferUnderflowException =>
throw new CoderMalfunctionError(ex)
}
val result2 = if (result1.isUnderflow) {
val remaining = in.remaining
if (endOfInput && remaining > 0)
CoderResult.malformedForLength(remaining)
else
result1
} else {
result1
}
if (result2.isUnderflow || result2.isOverflow) {
result2
} else {
val action =
if (result2.isUnmappable) unmappableCharacterAction
else malformedInputAction
action match {
case CodingErrorAction.REPLACE =>
if (out.remaining < replacement.length) {
CoderResult.OVERFLOW
} else {
out.put(replacement)
in.position(in.position + result2.length)
loop()
}
case CodingErrorAction.REPORT =>
result2
case CodingErrorAction.IGNORE =>
in.position(in.position + result2.length)
loop()
}
}
}
loop()
}
final def flush(out: CharBuffer): CoderResult = {
(status: @switch) match {
case END =>
val result = implFlush(out)
if (result.isUnderflow)
status = FLUSHED
result
case FLUSHED =>
CoderResult.UNDERFLOW
case _ =>
throw new IllegalStateException
}
}
protected def implFlush(out: CharBuffer): CoderResult =
CoderResult.UNDERFLOW
final def reset(): CharsetDecoder = {
status = INIT
implReset()
this
}
protected def implReset(): Unit = ()
protected def decodeLoop(in: ByteBuffer, out: CharBuffer): CoderResult
final def decode(in: ByteBuffer): CharBuffer = {
def grow(out: CharBuffer): CharBuffer = {
if (out.capacity == 0) {
CharBuffer.allocate(1)
} else {
val result = CharBuffer.allocate(out.capacity*2)
out.flip()
result.put(out)
result
}
}
@inline
@tailrec
def loopDecode(out: CharBuffer): CharBuffer = {
val result = decode(in, out, endOfInput = true)
if (result.isUnderflow) {
assert(!in.hasRemaining)
out
} else if (result.isOverflow) {
loopDecode(grow(out))
} else {
result.throwException()
throw new AssertionError("should not get here")
}
}
@inline
@tailrec
def loopFlush(out: CharBuffer): CharBuffer = {
val result = flush(out)
if (result.isUnderflow) {
out
} else if (result.isOverflow) {
loopFlush(grow(out))
} else {
result.throwException()
throw new AssertionError("should not get here")
}
}
reset()
val initLength = (in.remaining.toDouble * averageCharsPerByte).toInt
val out = loopFlush(loopDecode(CharBuffer.allocate(initLength)))
out.flip()
out
}
def isAutoDetecting(): Boolean = false
def isCharsetDetected(): Boolean =
throw new UnsupportedOperationException
def detectedCharset(): Charset =
throw new UnsupportedOperationException
}
object CharsetDecoder {
private final val INIT = 1
private final val ONGOING = 2
private final val END = 3
private final val FLUSHED = 4
}
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