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| org.apache.commons.jexl.parser.ASTEmptyFunction |
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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 | ||
| 17 | package org.apache.commons.jexl.parser; |
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| 18 | ||
| 19 | import org.apache.commons.jexl.JexlContext; |
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| 20 | ||
| 21 | import java.util.Collection; |
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| 22 | import java.util.Map; |
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| 23 | ||
| 24 | /** |
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| 25 | * function to see if reference doesn't exist in context |
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| 26 | * |
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| 27 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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| 28 | * @author <a href="mailto:tobrien@apache.org">Tim O'Brien</a> |
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| 29 | * @version $Id: ASTEmptyFunction.java,v 1.6 2004/08/23 13:30:36 dion Exp $ |
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| 30 | */ |
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| 31 | public class ASTEmptyFunction extends SimpleNode |
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| 32 | { |
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| 33 | public ASTEmptyFunction(int id) |
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| 34 | { |
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| 35 | 0 | super(id); |
| 36 | 0 | } |
| 37 | ||
| 38 | public ASTEmptyFunction(Parser p, int id) |
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| 39 | { |
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| 40 | 321 | super(p, id); |
| 41 | 321 | } |
| 42 | ||
| 43 | /** Accept the visitor. **/ |
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| 44 | public Object jjtAccept(ParserVisitor visitor, Object data) |
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| 45 | { |
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| 46 | 0 | return visitor.visit(this, data); |
| 47 | } |
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| 48 | ||
| 49 | public Object value(JexlContext jc) |
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| 50 | throws Exception |
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| 51 | { |
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| 52 | 306 | SimpleNode sn = (SimpleNode) jjtGetChild(0); |
| 53 | ||
| 54 | /* |
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| 55 | * I can't believe this |
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| 56 | */ |
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| 57 | ||
| 58 | 306 | Object o = sn.value(jc); |
| 59 | ||
| 60 | 306 | if (o == null) |
| 61 | 54 | return Boolean.TRUE; |
| 62 | ||
| 63 | 252 | if (o instanceof String && "".equals((String) o)) |
| 64 | 126 | return Boolean.TRUE; |
| 65 | ||
| 66 | 126 | if (o.getClass().isArray() && ((Object[])o).length == 0) |
| 67 | 15 | return Boolean.TRUE; |
| 68 | ||
| 69 | 111 | if (o instanceof Collection && ((Collection)o).isEmpty()) |
| 70 | 45 | return Boolean.TRUE; |
| 71 | ||
| 72 | /* |
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| 73 | * Map isn't a collection |
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| 74 | */ |
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| 75 | 66 | if (o instanceof Map && ((Map)o).isEmpty()) |
| 76 | 15 | return Boolean.TRUE; |
| 77 | ||
| 78 | 51 | return Boolean.FALSE; |
| 79 | } |
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| 80 | } |
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