01: /*
02: * Copyright 2002-2006 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16: package org.apache.commons.jexl.parser;
17:
18: import org.apache.commons.jexl.JexlContext;
19: import org.apache.commons.jexl.util.Coercion;
20:
21: /**
22: * Not : 'not' or '!'.
23: *
24: * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
25: * @version $Id: ASTNotNode.java 398270 2006-04-30 03:02:58Z dion $
26: */
27:
28: public class ASTNotNode extends SimpleNode {
29: /**
30: * Create the node given an id.
31: *
32: * @param id node id.
33: */
34: public ASTNotNode(int id) {
35: super (id);
36: }
37:
38: /**
39: * Create a node with the given parser and id.
40: *
41: * @param p a parser.
42: * @param id node id.
43: */
44: public ASTNotNode(Parser p, int id) {
45: super (p, id);
46: }
47:
48: /** {@inheritDoc} */
49: public Object jjtAccept(ParserVisitor visitor, Object data) {
50: return visitor.visit(this , data);
51: }
52:
53: /** {@inheritDoc} */
54: public Object value(JexlContext jc) throws Exception {
55: Object val = ((SimpleNode) jjtGetChild(0)).value(jc);
56:
57: /*
58: * coercion rules
59: */
60:
61: Boolean b = Coercion.coerceBoolean(val);
62:
63: if (b != null) {
64: return b.booleanValue() ? Boolean.FALSE : Boolean.TRUE;
65: }
66:
67: throw new Exception("expression not boolean valued");
68: }
69:
70: }
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