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org.apache.commons.jexl.parser.ASTSizeFunction |
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1 | /* |
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2 | * Copyright 2002-2006 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 java.lang.reflect.Array; |
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19 | import java.util.Collection; |
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20 | import java.util.Map; |
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21 | ||
22 | import org.apache.commons.jexl.JexlContext; |
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23 | import org.apache.commons.jexl.util.Introspector; |
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24 | import org.apache.commons.jexl.util.introspection.Info; |
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25 | import org.apache.commons.jexl.util.introspection.VelMethod; |
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26 | ||
27 | /** |
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28 | * generalized size() function for all classes we can think of. |
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29 | * |
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30 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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31 | * @author <a href="hw@kremvax.net">Mark H. Wilkinson</a> |
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32 | * @version $Id: ASTSizeFunction.java 398324 2006-04-30 12:20:24Z dion $ |
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33 | */ |
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34 | public class ASTSizeFunction extends SimpleNode { |
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35 | /** |
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36 | * Create the node given an id. |
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37 | * |
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38 | * @param id node id. |
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39 | */ |
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40 | public ASTSizeFunction(int id) { |
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41 | 0 | super(id); |
42 | 0 | } |
43 | ||
44 | /** |
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45 | * Create a node with the given parser and id. |
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46 | * |
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47 | * @param p a parser. |
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48 | * @param id node id. |
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49 | */ |
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50 | public ASTSizeFunction(Parser p, int id) { |
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51 | 13 | super(p, id); |
52 | 13 | } |
53 | ||
54 | /** {@inheritDoc} */ |
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55 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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56 | 0 | return visitor.visit(this, data); |
57 | } |
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58 | ||
59 | /** {@inheritDoc} */ |
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60 | public Object value(JexlContext jc) throws Exception { |
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61 | 13 | SimpleNode arg = (SimpleNode) jjtGetChild(0); |
62 | ||
63 | 13 | Object val = arg.value(jc); |
64 | ||
65 | 13 | if (val == null) { |
66 | 0 | throw new Exception("size() : null arg"); |
67 | } |
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68 | ||
69 | 13 | return new Integer(ASTSizeFunction.sizeOf(val)); |
70 | } |
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71 | ||
72 | /** |
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73 | * Calculate the <code>size</code> of various types: Collection, Array, Map, String, |
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74 | * and anything that has a int size() method. |
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75 | * |
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76 | * @param val the object to get the size of. |
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77 | * @return the size of val |
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78 | * @throws Exception if the size cannot be determined. |
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79 | */ |
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80 | public static int sizeOf(Object val) throws Exception { |
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81 | 20 | if (val instanceof Collection) { |
82 | 9 | return ((Collection) val).size(); |
83 | 11 | } else if (val.getClass().isArray()) { |
84 | 1 | return Array.getLength(val); |
85 | 10 | } else if (val instanceof Map) { |
86 | 2 | return ((Map) val).size(); |
87 | 8 | } else if (val instanceof String) { |
88 | 6 | return ((String) val).length(); |
89 | } else { |
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90 | // check if there is a size method on the object that returns an |
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91 | // integer |
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92 | // and if so, just use it |
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93 | 2 | Object[] params = new Object[0]; |
94 | 2 | Info velInfo = new Info("", 1, 1); |
95 | 2 | VelMethod vm = Introspector.getUberspect().getMethod(val, "size", params, velInfo); |
96 | 2 | if (vm != null && vm.getReturnType() == Integer.TYPE) { |
97 | 2 | Integer result = (Integer) vm.invoke(val, params); |
98 | 2 | return result.intValue(); |
99 | } |
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100 | 0 | throw new Exception("size() : unknown type : " + val.getClass()); |
101 | } |
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102 | } |
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103 | ||
104 | } |
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