1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.velocity.context.InternalContextAdapter;
23 import org.apache.velocity.runtime.parser.Parser;
24
25 /**
26 * Handles number addition of nodes.<br><br>
27 *
28 * Please look at the Parser.jjt file which is
29 * what controls the generation of this class.
30 *
31 * @author <a href="mailto:wglass@forio.com">Will Glass-Husain</a>
32 * @author <a href="mailto:pero@antaramusic.de">Peter Romianowski</a>
33 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
34 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
35 * @version $Id: ASTAddNode.java 712887 2008-11-11 00:27:50Z nbubna $
36 */
37 public class ASTAddNode extends ASTMathNode
38 {
39 /**
40 * @param id
41 */
42 public ASTAddNode(int id)
43 {
44 super(id);
45 }
46
47 /**
48 * @param p
49 * @param id
50 */
51 public ASTAddNode(Parser p, int id)
52 {
53 super(p, id);
54 }
55
56 //@Override
57 protected Object handleSpecial(Object left, Object right, InternalContextAdapter context)
58 {
59 /*
60 * shall we try for strings?
61 */
62 if (left instanceof String || right instanceof String)
63 {
64 if (left == null)
65 {
66 left = jjtGetChild(0).literal();
67 }
68 else if (right == null)
69 {
70 right = jjtGetChild(1).literal();
71 }
72 return left.toString().concat(right.toString());
73 }
74 return null;
75 }
76
77 public Number perform(Number left, Number right, InternalContextAdapter context)
78 {
79 return MathUtils.add(left, right);
80 }
81
82 }
83
84
85
86