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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools
import java.lang.reflect.Method
import java.{ lang => jl }
package object reflect {
def nameAndArity(m: Method) = (m.getName, m.getParameterTypes.size)
def allInterfaces(cl: Class[_]): List[Class[_]] =
if (cl == null) Nil
else cl.getInterfaces.toList ++ allInterfaces(cl.getSuperclass) distinct
def methodsNamed(target: AnyRef, name: String): List[Method] =
target.getClass.getMethods filter (x => x.getName == name) toList
/** If there is a single non-bridge apply method in the given instance,
* return it: otherwise None.
*/
def uniqueApply(target: AnyRef) = {
methodsNamed(target, "apply") filterNot (_.isBridge) match {
case List(x) => Some(x)
case _ => None
}
}
def zeroOfClass(clazz: Class[_]) = zeroOf(ClassTag(clazz))
def zeroOf[T](implicit t: ClassTag[T]): AnyRef = {
if (t == classTag[Boolean] || t == classTag[jl.Boolean]) false: jl.Boolean
else if (t == classTag[Unit] || t == classTag[jl.Void] || t == classTag[scala.runtime.BoxedUnit]) scala.runtime.BoxedUnit.UNIT
else if (t == classTag[Char] || t == classTag[jl.Character]) 0.toChar: jl.Character
else if (t == classTag[Byte] || t == classTag[jl.Byte]) 0.toByte: jl.Byte
else if (t == classTag[Short] || t == classTag[jl.Short]) 0.toShort: jl.Short
else if (t == classTag[Int] || t == classTag[jl.Integer]) 0: jl.Integer
else if (t == classTag[Long] || t == classTag[jl.Long]) 0l: jl.Long
else if (t == classTag[Float] || t == classTag[jl.Float]) 0f: jl.Float
else if (t == classTag[Double] || t == classTag[jl.Double]) 0d: jl.Double
else null
}
}
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