1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.jexl.parser;
18
19 import org.apache.commons.jexl.JexlContext;
20 import org.apache.commons.jexl.util.Coercion;
21
22 /**
23 * Not : 'not' or '!'.
24 *
25 * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
26 * @version $Id: ASTNotNode.java 480412 2006-11-29 05:11:23Z bayard $
27 */
28
29 public class ASTNotNode extends SimpleNode {
30 /**
31 * Create the node given an id.
32 *
33 * @param id node id.
34 */
35 public ASTNotNode(int id) {
36 super(id);
37 }
38
39 /**
40 * Create a node with the given parser and id.
41 *
42 * @param p a parser.
43 * @param id node id.
44 */
45 public ASTNotNode(Parser p, int id) {
46 super(p, id);
47 }
48
49 /** {@inheritDoc} */
50 public Object jjtAccept(ParserVisitor visitor, Object data) {
51 return visitor.visit(this, data);
52 }
53
54 /** {@inheritDoc} */
55 public Object value(JexlContext jc) throws Exception {
56 Object val = ((SimpleNode) jjtGetChild(0)).value(jc);
57
58 /*
59 * coercion rules
60 */
61
62 Boolean b = Coercion.coerceBoolean(val);
63
64 if (b != null) {
65 return b.booleanValue() ? Boolean.FALSE : Boolean.TRUE;
66 }
67
68 throw new Exception("expression not boolean valued");
69 }
70
71 }