--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornStaticClassLinker.java	Mon Jan 21 11:03:56 2013 +0100
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.nashorn.internal.runtime.linker;
+
+import jdk.nashorn.internal.runtime.Context;
+import jdk.nashorn.internal.runtime.ECMAErrors;
+import org.dynalang.dynalink.CallSiteDescriptor;
+import org.dynalang.dynalink.beans.BeansLinker;
+import org.dynalang.dynalink.beans.StaticClass;
+import org.dynalang.dynalink.linker.GuardedInvocation;
+import org.dynalang.dynalink.linker.GuardingDynamicLinker;
+import org.dynalang.dynalink.linker.LinkRequest;
+import org.dynalang.dynalink.linker.LinkerServices;
+import org.dynalang.dynalink.linker.TypeBasedGuardingDynamicLinker;
+import org.dynalang.dynalink.support.Guards;
+
+/**
+ * Internal linker for {@link StaticClass} objects, only ever used by Nashorn engine and not exposed to other engines.
+ * It is used for extending the "new" operator on StaticClass in order to be able to instantiate interfaces and abstract
+ * classes by passing a ScriptObject or ScriptFunction as their implementation, e.g.:
+ * <pre>
+ *   var r = new Runnable() { run: function() { print("Hello World" } }
+ * </pre>
+ * or for SAM types, even just passing a function:
+ * <pre>
+ *   var r = new Runnable(function() { print("Hello World" })
+ * </pre>
+ */
+class NashornStaticClassLinker implements TypeBasedGuardingDynamicLinker {
+    private static final GuardingDynamicLinker staticClassLinker = BeansLinker.getLinkerForClass(StaticClass.class);
+
+    @Override
+    public boolean canLinkType(Class<?> type) {
+        return type == StaticClass.class;
+    }
+
+    @Override
+    public GuardedInvocation getGuardedInvocation(LinkRequest linkRequest, LinkerServices linkerServices) throws Exception {
+        final LinkRequest request = linkRequest.withoutRuntimeContext(); // Nashorn has no runtime context
+        final Object self = request.getReceiver();
+        if (self.getClass() != StaticClass.class) {
+            return null;
+        }
+        final CallSiteDescriptor desc = request.getCallSiteDescriptor();
+        // We intercept "new" on StaticClass instances to provide additional capabilities
+        if ("new".equals(desc.getNameToken(CallSiteDescriptor.OPERATOR))) {
+            final Class<?> receiverClass = ((StaticClass) self).getRepresentedClass();
+            // Is the class abstract? (This includes interfaces.)
+            if (JavaAdapterFactory.isAbstractClass(receiverClass)) {
+                // Change this link request into a link request on the adapter class.
+                final Object[] args = request.getArguments();
+                args[0] = JavaAdapterFactory.getAdapterClassFor(new Class<?>[] { receiverClass });
+                final LinkRequest adapterRequest = request.replaceArguments(request.getCallSiteDescriptor(), args);
+                final GuardedInvocation gi = checkNullConstructor(delegate(linkerServices, adapterRequest), receiverClass);
+                // Finally, modify the guard to test for the original abstract class.
+                return gi.replaceMethods(gi.getInvocation(), Guards.getIdentityGuard(self));
+            }
+            // If the class was not abstract, just delegate linking to the standard StaticClass linker. Make an
+            // additional check to ensure we have a constructor. We could just fall through to the next "return"
+            // statement, except we also insert a call to checkNullConstructor() which throws an ECMAScript TypeError
+            // with a more intuitive message when no suitable constructor is found.
+            return checkNullConstructor(delegate(linkerServices, request), receiverClass);
+        }
+        // In case this was not a "new" operation, just delegate to the the standard StaticClass linker.
+        return delegate(linkerServices, request);
+    }
+
+    private static GuardedInvocation delegate(LinkerServices linkerServices, final LinkRequest request) throws Exception {
+        return staticClassLinker.getGuardedInvocation(request, linkerServices);
+    }
+
+    private static GuardedInvocation checkNullConstructor(final GuardedInvocation ctorInvocation, final Class<?> receiverClass) {
+        if(ctorInvocation == null) {
+            ECMAErrors.typeError(Context.getGlobal(), "no.constructor.matches.args", receiverClass.getName());
+        }
+        return ctorInvocation;
+    }
+}