Ugly, but damned useful, structural type example

yuck.scala

class ClassDumper
{
    type Meth =
    {
        def getParameterTypes: Array[Class[_]]
        def getName: String
    }

    def methodToString(m: Meth): String =
    {
        m.getName +
        "(" + m.getParameterTypes.map(c => c.getCanonicalName).mkString(", ") +
        ")"
    }

    def methodStrings(l: Array[Meth]): List[String] =
        l.map {m => methodToString(m)}.toList.sortWith((a, b) => a < b)

    def classMethodSignatures(c: Class[_]): List[String] =
    {
        // Must cast, because getConstructors returns Array[Constructor[_]],
        // but getMethods returns Array[Method].
        methodStrings(c.getConstructors.asInstanceOf[Array[Meth]]) ++
        methodStrings(c.getMethods.asInstanceOf[Array[Meth]])
    }
}

object Test
{
    def main(args: Array[String])
    {
        val d = new ClassDumper

        for (a <- args)
        {
            println("Class: " + a)
            println("-" * 30)
            println(d.classMethodSignatures(Class.forName(a)).mkString("\n"))
        }
    }
}

Sample run:

$ scala -cp .:$HOME/src/mystuff/scala/grizzled-scala/grizzled-scala/target/scala-2.8.1.final/classes Test grizzled.file.GrizzledFile
Class: grizzled.file.GrizzledFile
------------------------------
grizzled.file.GrizzledFile(java.io.File)
basename()
copyTo(java.io.File)
copyTo(java.lang.String)
deleteRecursively()
dirname()
dirnameBasename()
dirnameBasenameExtension()
equals(java.lang.Object)
file()
getClass()
grizzledFileToJavaIoFile(grizzled.file.GrizzledFile)
hashCode()
isEmpty()
javaIoFileToGrizzledFile(java.io.File)
listRecursively$default$1()
listRecursively(boolean)
notify()
notifyAll()
relativePath(java.io.File)
split()
toString()
touch$default$1()
touch(long)
wait()
wait(long)
wait(long, int)
walk$default$1()
walk(boolean)

Cool! Might make a nice sbt command to fill the void left by javap's disappearance.

Hmm. Good point. In fact, that's almost exactly why I wrote it.