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org.apache.commons.jexl.parser.ASTNotNode |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jexl.parser; |
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17 | ||
18 | import org.apache.commons.jexl.JexlContext; |
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19 | import org.apache.commons.jexl.util.Coercion; |
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20 | ||
21 | /** |
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22 | * Not : 'not' or '!' |
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23 | * |
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24 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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25 | * @version $Id: ASTNotNode.java,v 1.3 2004/02/28 13:45:20 yoavs Exp $ |
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26 | */ |
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27 | ||
28 | public class ASTNotNode extends SimpleNode |
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29 | { |
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30 | public ASTNotNode(int id) |
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31 | { |
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32 | 0 | super(id); |
33 | 0 | } |
34 | ||
35 | public ASTNotNode(Parser p, int id) |
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36 | { |
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37 | 99 | super(p, id); |
38 | 99 | } |
39 | ||
40 | ||
41 | /** Accept the visitor. **/ |
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42 | public Object jjtAccept(ParserVisitor visitor, Object data) |
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43 | { |
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44 | 0 | return visitor.visit(this, data); |
45 | } |
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46 | ||
47 | public Object value(JexlContext jc) |
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48 | throws Exception |
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49 | { |
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50 | 99 | Object val = ((SimpleNode) jjtGetChild(0)).value(jc); |
51 | ||
52 | /* |
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53 | * coercion rules |
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54 | */ |
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55 | ||
56 | 99 | Boolean b = Coercion.coerceBoolean(val); |
57 | ||
58 | 99 | if (b != null) |
59 | 99 | return b.booleanValue() ? Boolean.FALSE : Boolean.TRUE; |
60 | ||
61 | 0 | throw new Exception("expression not boolean valued"); |
62 | } |
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63 | ||
64 | } |
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