make serializable abstract Lazy template

compile/api/SafeLazy.scala

@@ -13,7 +13,7 @@ object SafeLazy
 
 	def strict[T <: AnyRef](value: T): xsbti.api.Lazy[T] = apply(value)
 
-	private[this] final class Impl[T <: AnyRef](private[this] var eval: () => T) extends xsbti.api.Lazy[T]
+	private[this] final class Impl[T <: AnyRef](private[this] var eval: () => T) extends xsbti.api.AbstractLazy[T]
 	{
 		private[this] lazy val _t =
 		{

interface/src/main/java/xsbti/api/AbstractLazy.java

@@ -0,0 +1,26 @@
+/* sbt -- Simple Build Tool
+ * Copyright 2010  Mark Harrah
+ */
+package xsbti.api;
+
+	import java.io.ObjectStreamException;
+
+public abstract class AbstractLazy<T> implements Lazy<T>, java.io.Serializable
+{
+	private Object writeReplace() throws ObjectStreamException
+	{
+		return new StrictLazy<T>(get());
+	}
+	private static final class StrictLazy<T> implements Lazy<T>, java.io.Serializable
+	{
+		private final T value;
+		StrictLazy(T t)
+		{
+			value = t;
+		}
+		public T get()
+		{
+			return value;
+		}
+	}
+}

interface/src/main/java/xsbti/api/Lazy.java

@@ -1,5 +1,5 @@
 /* sbt -- Simple Build Tool
- * Copyright 2008, 2009  Mark Harrah
+ * Copyright 2010  Mark Harrah
  */
 package xsbti.api;