1 /*

     2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.nashorn.internal.ir;

    27 

    28 import jdk.nashorn.internal.ir.annotations.Reference;

    29 import jdk.nashorn.internal.ir.visitor.NodeVisitor;

    30 import jdk.nashorn.internal.runtime.Source;

    31 

    32 /**

    33  * IR representation of a reference to another entity (function.)

    34  */

    35 public class ReferenceNode extends Node {

    36     /** Node referenced. */

    37     @Reference

    38     private final FunctionNode reference;

    39 

    40     /**

    41      * Constructor

    42      *

    43      * @param source the source

    44      * @param token  token

    45      * @param finish finish

    46      * @param reference the function node to reference

    47      */

    48     public ReferenceNode(final Source source, final long token, final int finish, final FunctionNode reference) {

    49         super(source, token, finish);

    50 

    51         this.reference = reference;

    52     }

    53 

    54     private ReferenceNode(final ReferenceNode referenceNode) {

    55         super(referenceNode);

    56 

    57         this.reference = referenceNode.reference;

    58     }

    59 

    60     @Override

    61     protected Node copy(final CopyState cs) {

    62         return new ReferenceNode(this);

    63     }

    64 

    65     @Override

    66     public Node accept(final NodeVisitor visitor) {

    67         if (visitor.enter(this) != null) {

    68             return visitor.leave(this);

    69         }

    70 

    71         return this;

    72     }

    73 

    74     @Override

    75     public void toString(final StringBuilder sb) {

    76         if (reference == null) {

    77             sb.append("null");

    78         } else {

    79             reference.toString(sb);

    80         }

    81     }

    82 

    83     /**

    84      * Get there function node reference that this node points tp

    85      * @return a function node reference

    86      */

    87     public FunctionNode getReference() {

    88         return reference;

    89     }

    90 

    91 }