mirror of https://github.com/sbt/sbt.git
65 lines
2.7 KiB
Scala
65 lines
2.7 KiB
Scala
/* sbt -- Simple Build Tool
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* Copyright 2008 David MacIver, Mark Harrah
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*/
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package sbt
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import scala.collection._
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object ReflectUtilities {
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/** Converts the camelCase String `name` to lowercase separated by `separator`. */
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def transformCamelCase(name: String, separator: Char): String =
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{
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val buffer = new StringBuilder
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for (char <- name) {
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import java.lang.Character._
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if (isUpperCase(char)) {
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buffer += separator
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buffer += toLowerCase(char)
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} else
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buffer += char
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}
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buffer.toString
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}
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def ancestry(clazz: Class[_]): List[Class[_]] =
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if (clazz == classOf[AnyRef] || !classOf[AnyRef].isAssignableFrom(clazz)) List(clazz)
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else clazz :: ancestry(clazz.getSuperclass);
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def fields(clazz: Class[_]) =
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mutable.OpenHashMap(ancestry(clazz).
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flatMap(_.getDeclaredFields).
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map(f => (f.getName, f)): _*)
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/**
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* Collects all `val`s of type `T` defined on value `self`.
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* The returned Map maps the name of each `val` to its value.
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* This depends on scalac implementation details to determine what is a `val` using only Java reflection.
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*/
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def allValsC[T](self: AnyRef, clazz: Class[T]): immutable.SortedMap[String, T] =
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{
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var mappings = new immutable.TreeMap[String, T]
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val correspondingFields = fields(self.getClass)
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for (method <- self.getClass.getMethods) {
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if (method.getParameterTypes.length == 0 && clazz.isAssignableFrom(method.getReturnType)) {
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for (field <- correspondingFields.get(method.getName) if field.getType == method.getReturnType) {
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val value = method.invoke(self).asInstanceOf[T]
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if (value == null) throw new UninitializedVal(method.getName, method.getDeclaringClass.getName)
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mappings += ((method.getName, value))
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}
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}
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}
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mappings
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}
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/**
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* Collects all `val`s of type `T` defined on value `self`.
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* The returned Map maps the name of each `val` to its value.
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* This requires an available `Manifest` for `T` and depends on scalac implementation details to determine
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* what is a `val` using only Java reflection.
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*/
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def allVals[T](self: AnyRef)(implicit mt: scala.reflect.Manifest[T]): immutable.SortedMap[String, T] =
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allValsC(self, mt.runtimeClass).asInstanceOf[immutable.SortedMap[String, T]]
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}
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/** An exception to indicate that while traversing the `val`s for an instance of `className`, the `val` named `valName` was `null`. */
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final class UninitializedVal(val valName: String, val className: String) extends RuntimeException("val " + valName + " in class " + className + " was null.\nThis is probably an initialization problem and a 'lazy val' should be used.") |