--- /dev/null	2015-03-09 08:23:42.456618816 +0530
+++ new/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/api/tree/TreeImpl.java	2015-03-09 18:39:34.379853515 +0530
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2015, 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.api.tree;
+
+import jdk.nashorn.internal.ir.Node;
+
+import jdk.nashorn.internal.parser.TokenType;
+
+abstract class TreeImpl implements Tree {
+    protected final Node node;
+    
+    TreeImpl(final Node node) {
+        this.node = node;
+    }
+    
+    @Override
+    public long getStartPosition() {
+        return node.getStart();
+    }
+
+    @Override
+    public long getEndPosition() {
+        return node.getFinish();
+    }
+    
+    @Override
+    public <R,D> R accept(TreeVisitor<R,D> visitor, D data) {
+        return visitor.visitUnknown(this, data);
+    }
+    
+    static Kind getOperator(final TokenType tt) {
+        switch(tt) {
+            case NEW:
+                return Kind.NEW;
+            case NOT:
+                return Kind.LOGICAL_COMPLEMENT;
+            case NE:
+                return Kind.NOT_EQUAL_TO;
+            case NE_STRICT:
+                return Kind.STRICT_NOT_EQUAL_TO;
+            case MOD:
+                return Kind.REMAINDER;
+            case ASSIGN_MOD:
+                return Kind.REMAINDER_ASSIGNMENT;
+            case BIT_AND:
+                return Kind.AND;
+            case AND:
+                return Kind.CONDITIONAL_AND;
+            case ASSIGN_BIT_AND:
+                return Kind.AND_ASSIGNMENT;
+            case MUL:
+                return Kind.MULTIPLY;
+            case ASSIGN_MUL:
+                return Kind.MULTIPLY_ASSIGNMENT;
+            case ADD:
+                return Kind.PLUS;
+            case INCPREFIX:
+                return Kind.PREFIX_INCREMENT;
+            case INCPOSTFIX:
+                return Kind.POSTFIX_INCREMENT;
+            case ASSIGN_ADD:
+                return Kind.PLUS_ASSIGNMENT;
+            case SUB:
+                return Kind.MINUS;
+            case DECPREFIX:
+                return Kind.PREFIX_DECREMENT;                
+            case DECPOSTFIX:
+                return Kind.POSTFIX_DECREMENT;
+            case ASSIGN_SUB:
+                return Kind.MINUS_ASSIGNMENT;    
+            case DIV:
+                return Kind.DIVIDE;
+            case ASSIGN_DIV:
+                return Kind.DIVIDE_ASSIGNMENT;
+            case LT:
+                return Kind.LESS_THAN;
+            case SHL:
+                return Kind.LEFT_SHIFT;
+            case ASSIGN_SHL:
+                return Kind.LEFT_SHIFT_ASSIGNMENT;
+            case LE:
+                return Kind.LESS_THAN_EQUAL;
+            case ASSIGN:
+                return Kind.ASSIGNMENT;
+            case EQ:
+                return Kind.EQUAL_TO;
+            case EQ_STRICT:
+                return Kind.STRICT_EQUAL_TO;
+            case GT:
+                return Kind.GREATER_THAN;
+            case GE:
+                return Kind.GREATER_THAN_EQUAL;
+            case SAR:
+                return Kind.RIGHT_SHIFT;
+            case ASSIGN_SAR:
+                return Kind.RIGHT_SHIFT_ASSIGNMENT;
+            case SHR:
+                return Kind.UNSIGNED_RIGHT_SHIFT;
+            case ASSIGN_SHR:
+                return Kind.UNSIGNED_RIGHT_SHIFT_ASSIGNMENT;
+            case TERNARY:
+                return Kind.CONDITIONAL_EXPRESSION;
+            case BIT_XOR:
+                return Kind.XOR;
+            case ASSIGN_BIT_XOR:
+                return Kind.XOR_ASSIGNMENT;
+            case BIT_OR:
+                return Kind.OR;
+            case ASSIGN_BIT_OR:
+                return Kind.OR_ASSIGNMENT;
+            case OR:
+                return Kind.CONDITIONAL_OR;
+            case BIT_NOT:
+                return Kind.BITWISE_COMPLEMENT;
+            case DELETE:
+                return Kind.DELETE;
+            case TYPEOF:
+                return Kind.TYPEOF;
+            case VOID:
+                return Kind.VOID;
+            case IN:
+                return Kind.IN;
+            case INSTANCEOF:
+                return Kind.INSTANCE_OF;
+            case COMMARIGHT:
+                return Kind.COMMA;
+            default:
+                throw new AssertionError("should not reach here: " + tt);
+        }
+    }
+}