/* sbt -- Simple Build Tool
 * Copyright 2009 Mark Harrah
 */
package sbt
package classfile

import Constants._
import java.io.File

private[sbt] trait ClassFile
{
	val majorVersion: Int
	val minorVersion: Int
	val fileName: String
	val className: String
	val superClassName: String
	val interfaceNames: Array[String]
	val accessFlags: Int
	val constantPool: Array[Constant]
	val fields: Array[FieldOrMethodInfo]
	val methods: Array[FieldOrMethodInfo]
	val attributes: Array[AttributeInfo]
	val sourceFile: Option[String]
	def types: Set[String]
	def stringValue(a: AttributeInfo): String
}

private[sbt] final case class Constant(tag: Byte, nameIndex: Int, typeIndex: Int, value: Option[AnyRef]) extends NotNull
{
	def this(tag: Byte, nameIndex: Int, typeIndex: Int) = this(tag, nameIndex, typeIndex, None)
	def this(tag: Byte, nameIndex: Int) = this(tag, nameIndex, -1)
	def this(tag: Byte, value: AnyRef) = this(tag, -1, -1, Some(value))
	def wide = tag == ConstantLong || tag == ConstantDouble
}
private[sbt] final case class FieldOrMethodInfo(accessFlags: Int, name: Option[String], descriptor: Option[String], attributes: IndexedSeq[AttributeInfo]) extends NotNull
{
	def isStatic = (accessFlags&ACC_STATIC)== ACC_STATIC
	def isPublic = (accessFlags&ACC_PUBLIC)==ACC_PUBLIC
	def isMain = isPublic && isStatic && descriptor.filter(_ == "([Ljava/lang/String;)V").isDefined
}
private[sbt] final case class AttributeInfo(name: Option[String], value: Array[Byte]) extends NotNull
{
	def isNamed(s: String) = name.filter(s == _).isDefined
	def isSignature = isNamed("Signature")
	def isSourceFile = isNamed("SourceFile")
}
private[sbt] object Constants
{
	final val ACC_STATIC = 0x0008
	final val ACC_PUBLIC = 0x0001

	final val JavaMagic = 0xCAFEBABE
	final val ConstantUTF8 = 1
	final val ConstantUnicode = 2
	final val ConstantInteger = 3
	final val ConstantFloat = 4
	final val ConstantLong = 5
	final val ConstantDouble = 6
	final val ConstantClass = 7
	final val ConstantString = 8
	final val ConstantField = 9
	final val ConstantMethod = 10
	final val ConstantInterfaceMethod = 11
	final val ConstantNameAndType = 12
	final val ClassDescriptor = 'L'
}