From aa6ebe938639f07dd6f5612e645f1449f37a86eb Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Thu, 5 Jan 2017 16:02:09 +0700
Subject: Implement structural type member access

New scheme for implementing structural type member access.
---
 library/src/scala/Projector.scala         | 10 +++++
 library/src/scala/reflect/Projector.scala | 71 +++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 library/src/scala/Projector.scala
 create mode 100644 library/src/scala/reflect/Projector.scala

(limited to 'library')

diff --git a/library/src/scala/Projector.scala b/library/src/scala/Projector.scala
new file mode 100644
index 000000000..cff73f84d
--- /dev/null
+++ b/library/src/scala/Projector.scala
@@ -0,0 +1,10 @@
+package scala
+import scala.reflect.ClassTag
+import scala.annotation.implicitNotFound
+
+@implicitNotFound("no projector instance found to implement reflective access to structural type ${T}")
+trait Projector[-T] extends Any {
+  def get(receiver: T, name: String): Any
+  def getMethod(receiver: T, name: String, paramClasses: ClassTag[_]*): Any =
+    new UnsupportedOperationException("getMethod")
+}
diff --git a/library/src/scala/reflect/Projector.scala b/library/src/scala/reflect/Projector.scala
new file mode 100644
index 000000000..68240da76
--- /dev/null
+++ b/library/src/scala/reflect/Projector.scala
@@ -0,0 +1,71 @@
+package scala.reflect
+
+class Projector extends scala.Projector[Any] {
+  import Projector._
+  def get(receiver: Any, name: String): Any = {
+    val rcls = receiver.getClass
+    try {
+      val fld = rcls.getField(name)
+      fld.get(receiver)
+    }
+    catch {
+      case ex: NoSuchFieldError =>
+        getMethod(receiver, name).asInstanceOf[() => Any]()
+    }
+  }
+
+  override def getMethod(receiver: Any, name: String, paramTypes: ClassTag[_]*): Any = {
+    val rcls = receiver.getClass
+    val paramClasses = paramTypes.map(_.runtimeClass)
+    val mth = rcls.getMethod(name, paramClasses: _*)
+    paramTypes.length match {
+      case 0 => () =>
+        mth.invoke(receiver)
+      case 1 => (x0: Any) =>
+        mth.invoke(receiver, x0.asInstanceOf[Object])
+      case 2 => (x0: Any, x1: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object])
+      case 3 => (x0: Any, x1: Any, x2: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object],
+            x2.asInstanceOf[Object])
+      case 4 => (x0: Any, x1: Any, x2: Any, x3: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object],
+            x2.asInstanceOf[Object],
+            x3.asInstanceOf[Object])
+      case 5 => (x0: Any, x1: Any, x2: Any, x3: Any, x4: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object],
+            x2.asInstanceOf[Object],
+            x3.asInstanceOf[Object],
+            x4.asInstanceOf[Object])
+      case 6 => (x0: Any, x1: Any, x2: Any, x3: Any, x4: Any, x5: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object],
+            x2.asInstanceOf[Object],
+            x3.asInstanceOf[Object],
+            x4.asInstanceOf[Object],
+            x5.asInstanceOf[Object])
+      case 7 => (x0: Any, x1: Any, x2: Any, x3: Any, x4: Any, x5: Any, x6: Any) =>
+        mth.invoke(receiver,
+            x0.asInstanceOf[Object],
+            x1.asInstanceOf[Object],
+            x2.asInstanceOf[Object],
+            x3.asInstanceOf[Object],
+            x4.asInstanceOf[Object],
+            x5.asInstanceOf[Object],
+            x6.asInstanceOf[Object])
+      }
+  }
+}
+
+object Projector {
+  implicit def reflectiveProjector: scala.Projector[Any] = new Projector
+}
\ No newline at end of file
-- 
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