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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2007-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.reflect
import scala.runtime._
import scala.collection.mutable._
/** <p>
* A <code>Manifest[T]</code> is an opaque descriptor for type <code>T</code>.
* Currently, its only use is to give access to the erasure of the type as a
* <code>Class</code> instance.
* </p>
* <p>
* <b>BE AWARE</b>: The different type-relation operators are all forwarded
* to the erased type as an approximation of the final semantics where
* these operators should be on the unerased type.
* </p>
*/
@serializable
trait Manifest[T] extends ClassManifest[T] {
override def typeArguments: List[Manifest[_]] = List()
override def arrayManifest: Manifest[Array[T]] =
Manifest.classType[Array[T]](arrayClass)
}
/** <ps>
* This object is used by the compiler and <b>should not be used in client
* code</b>. The object <code>Manifest</code> defines factory methods for
* manifests.
* </p>
* <p>
* <b>BE AWARE</b>: The factory for refinement types is missing and
* will be implemented in a later version of this class.
* </p>
*/
object Manifest {
val Byte = new (Manifest[Byte] @serializable) {
def erasure = java.lang.Byte.TYPE
override def toString = "Byte"
override def newArray(len: Int): Array[Byte] = new Array[Byte](len)
override def newWrappedArray(len: Int): WrappedArray[Byte] = new WrappedArray.ofByte(new Array[Byte](len))
override def newArrayBuilder(): ArrayBuilder[Byte] = new ArrayBuilder.ofByte()
}
val Short = new (Manifest[Short] @serializable) {
def erasure = java.lang.Short.TYPE
override def toString = "Short"
override def newArray(len: Int): Array[Short] = new Array[Short](len)
override def newWrappedArray(len: Int): WrappedArray[Short] = new WrappedArray.ofShort(new Array[Short](len))
override def newArrayBuilder(): ArrayBuilder[Short] = new ArrayBuilder.ofShort()
}
val Char = new (Manifest[Char] @serializable) {
def erasure = java.lang.Character.TYPE
override def toString = "Char"
override def newArray(len: Int): Array[Char] = new Array[Char](len)
override def newWrappedArray(len: Int): WrappedArray[Char] = new WrappedArray.ofChar(new Array[Char](len))
override def newArrayBuilder(): ArrayBuilder[Char] = new ArrayBuilder.ofChar()
}
val Int = new (Manifest[Int] @serializable) {
def erasure = java.lang.Integer.TYPE
override def toString = "Int"
override def newArray(len: Int): Array[Int] = new Array[Int](len)
override def newWrappedArray(len: Int): WrappedArray[Int] = new WrappedArray.ofInt(new Array[Int](len))
override def newArrayBuilder(): ArrayBuilder[Int] = new ArrayBuilder.ofInt()
}
val Long = new (Manifest[Long] @serializable) {
def erasure = java.lang.Long.TYPE
override def toString = "Long"
override def newArray(len: Int): Array[Long] = new Array[Long](len)
override def newWrappedArray(len: Int): WrappedArray[Long] = new WrappedArray.ofLong(new Array[Long](len))
override def newArrayBuilder(): ArrayBuilder[Long] = new ArrayBuilder.ofLong()
}
val Float = new (Manifest[Float] @serializable) {
def erasure = java.lang.Float.TYPE
override def toString = "Float"
override def newArray(len: Int): Array[Float] = new Array[Float](len)
override def newWrappedArray(len: Int): WrappedArray[Float] = new WrappedArray.ofFloat(new Array[Float](len))
override def newArrayBuilder(): ArrayBuilder[Float] = new ArrayBuilder.ofFloat()
}
val Double = new (Manifest[Double] @serializable) {
def erasure = java.lang.Double.TYPE
override def toString = "Double"
override def newArray(len: Int): Array[Double] = new Array[Double](len)
override def newWrappedArray(len: Int): WrappedArray[Double] = new WrappedArray.ofDouble(new Array[Double](len))
override def newArrayBuilder(): ArrayBuilder[Double] = new ArrayBuilder.ofDouble()
}
val Boolean = new (Manifest[Boolean] @serializable) {
def erasure = java.lang.Boolean.TYPE
override def toString = "Boolean"
override def newArray(len: Int): Array[Boolean] = new Array[Boolean](len)
override def newWrappedArray(len: Int): WrappedArray[Boolean] = new WrappedArray.ofBoolean(new Array[Boolean](len))
override def newArrayBuilder(): ArrayBuilder[Boolean] = new ArrayBuilder.ofBoolean()
}
val Unit = new (Manifest[Unit] @serializable) {
def erasure = java.lang.Void.TYPE
override def toString = "Unit"
override def newArray(len: Int): Array[Unit] = new Array[Unit](len)
override def newWrappedArray(len: Int): WrappedArray[Unit] = new WrappedArray.ofUnit(new Array[Unit](len))
override def newArrayBuilder(): ArrayBuilder[Unit] = new ArrayBuilder.ofUnit()
}
val Any: Manifest[Any] = new ClassTypeManifest[Any](None, classOf[java.lang.Object], List()) {
override def toString = "Any"
// todo: re-implement <:<
}
val Object: Manifest[Object] = new ClassTypeManifest[Object](None, classOf[java.lang.Object], List()) {
override def toString = "Object"
// todo: re-implement <:<
}
val AnyVal: Manifest[AnyVal] = new ClassTypeManifest[AnyVal](None, classOf[java.lang.Object], List()) {
override def toString = "AnyVal"
// todo: re-implement <:<
}
val Null: Manifest[Null] = new ClassTypeManifest[Null](None, classOf[java.lang.Object], List()) {
override def toString = "Null"
// todo: re-implement <:<
}
val Nothing: Manifest[Nothing] = new ClassTypeManifest[Nothing](None, classOf[java.lang.Object], List()) {
override def toString = "Nothing"
// todo: re-implement <:<
}
/** Manifest for the singleton type `value.type'. */
def singleType[T](value: Any): Manifest[T] =
new (Manifest[T] @serializable) {
lazy val erasure =
value match {
case anyRefValue: AnyRef => anyRefValue.getClass
case anyValue => error("There is no singleton type for AnyVal values")
}
override lazy val toString = value.toString + ".type"
}
/** Manifest for the class type `clazz[args]', where `clazz' is
* a top-level or static class.
* @note This no-prefix, no-arguments case is separate because we
* it's called from ScalaRunTime.boxArray itself. If we
* pass varargs as arrays into this, we get an infinitely recursive call
* to boxArray. (Besides, having a separate case is more efficient)
*/
def classType[T](clazz: Predef.Class[_]): Manifest[T] =
new ClassTypeManifest[T](None, clazz, Nil)
/** Manifest for the class type `clazz', where `clazz' is
* a top-level or static class and args are its type arguments. */
def classType[T](clazz: Predef.Class[T], arg1: Manifest[_], args: Manifest[_]*): Manifest[T] =
new ClassTypeManifest[T](None, clazz, arg1 :: args.toList)
/** Manifest for the class type `clazz[args]', where `clazz' is
* a class with non-package prefix type `prefix` and type arguments `args`.
*/
def classType[T](prefix: Manifest[_], clazz: Predef.Class[_], args: Manifest[_]*): Manifest[T] =
new ClassTypeManifest[T](Some(prefix), clazz, args.toList)
/** Manifest for the class type `clazz[args]', where `clazz' is
* a top-level or static class. */
@serializable
private class ClassTypeManifest[T](prefix: Option[Manifest[_]],
val erasure: Predef.Class[_],
override val typeArguments: List[Manifest[_]]) extends Manifest[T] {
override def toString =
(if (prefix.isEmpty) "" else prefix.get.toString+"#") +
(if (erasure.isArray) "Array" else erasure.getName) +
argString
}
def arrayType[T](arg: Manifest[_]): Manifest[Array[T]] =
arg.asInstanceOf[Manifest[T]].arrayManifest
/** Manifest for the abstract type `prefix # name'. `upperBound' is not
* strictly necessary as it could be obtained by reflection. It was
* added so that erasure can be calculated without reflection. */
def abstractType[T](prefix: Manifest[_], name: String, upperBound: Manifest[_], args: Manifest[_]*): Manifest[T] =
new (Manifest[T] @serializable) {
def erasure = upperBound.erasure
override val typeArguments = args.toList
override def toString = prefix.toString+"#"+name+argString
}
/** Manifest for the intersection type `parents_0 with ... with parents_n'. */
def intersectionType[T](parents: Manifest[_]*): Manifest[T] =
new (Manifest[T] @serializable) {
def erasure = parents.head.erasure
override def toString = parents.mkString(" with ")
}
}
|
