src/jdk/nashorn/internal/objects/NativeObject.java

rev 752 : 8011964: need indexed access to externally-managed ByteBuffer
Reviewed-by: lagergren, hannesw

@@ -29,10 +29,11 @@
 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
+import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;

@@ -56,10 +57,11 @@
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
+import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
 import jdk.nashorn.internal.runtime.linker.InvokeByName;
 import jdk.nashorn.internal.runtime.linker.NashornBeansLinker;
 
 /**

@@ -99,10 +101,31 @@
     private static ECMAException notAnObject(final Object obj) {
         return typeError("not.an.object", ScriptRuntime.safeToString(obj));
     }
 
     /**
+     * Nashorn extension: setIndexedPropertiesToExternalArrayData
+     *
+     * @param self self reference
+     * @param obj object whose index properties are backed by buffer
+     * @param buf external buffer - should be a nio ByteBuffer
+     * @return the 'obj' object
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
+    public static Object setIndexedPropertiesToExternalArrayData(final Object self, final Object obj, final Object buf) {
+        Global.checkObject(obj);
+        final ScriptObject sobj = (ScriptObject)obj;
+        if (buf instanceof ByteBuffer) {
+            sobj.setArray(ArrayData.allocate((ByteBuffer)buf));
+        } else {
+            throw typeError("not.a.bytebuffer", "setIndexedPropertiesToExternalArrayData's buf argument");
+        }
+        return sobj;
+    }
+
+
+    /**
      * ECMA 15.2.3.2 Object.getPrototypeOf ( O )
      *
      * @param  self self reference
      * @param  obj object to get prototype from
      * @return the prototype of an object