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org.apache.commons.jexl.parser.ASTMethod |
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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.InvocationTargetException; |
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19 | import java.math.BigDecimal; |
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20 | import java.math.BigInteger; |
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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.VelMethod; |
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25 | import org.apache.commons.jexl.util.introspection.Info; |
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26 | ||
27 | /** |
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28 | * Method execution. |
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29 | */ |
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30 | public class ASTMethod extends SimpleNode { |
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31 | /** dummy velocity info. */ |
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32 | 5 | private static final Info DUMMY = new Info("", 1, 1); |
33 | ||
34 | /** |
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35 | * Create the node given an id. |
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36 | * |
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37 | * @param id node id. |
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38 | */ |
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39 | public ASTMethod(int id) { |
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40 | 0 | super(id); |
41 | 0 | } |
42 | ||
43 | /** |
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44 | * Create a node with the given parser and id. |
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45 | * |
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46 | * @param p a parser. |
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47 | * @param id node id. |
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48 | */ |
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49 | public ASTMethod(Parser p, int id) { |
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50 | 44 | super(p, id); |
51 | 44 | } |
52 | ||
53 | /** {@inheritDoc} */ |
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54 | public Object jjtAccept(ParserVisitor visitor, Object data) { |
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55 | 0 | return visitor.visit(this, data); |
56 | } |
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57 | ||
58 | /** |
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59 | * evaluate a method invocation upon a base object. |
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60 | * |
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61 | * foo.bar(2) |
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62 | * |
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63 | * @param jc the {@link JexlContext} to evaluate against. |
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64 | * @param obj The object to have the method invoked. |
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65 | * @return the value of the method invocation. |
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66 | * @throws Exception on any error |
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67 | */ |
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68 | public Object execute(Object obj, JexlContext jc) throws Exception { |
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69 | 39 | String methodName = ((ASTIdentifier) jjtGetChild(0)).val; |
70 | ||
71 | 39 | int paramCount = jjtGetNumChildren() - 1; |
72 | ||
73 | /* |
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74 | * get our params |
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75 | */ |
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76 | ||
77 | 39 | Object[] params = new Object[paramCount]; |
78 | ||
79 | try { |
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80 | 71 | for (int i = 0; i < paramCount; i++) { |
81 | 32 | params[i] = ((SimpleNode) jjtGetChild(i + 1)).value(jc); |
82 | } |
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83 | ||
84 | 39 | VelMethod vm = Introspector.getUberspect().getMethod(obj, methodName, params, DUMMY); |
85 | /* |
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86 | * DG: If we can't find an exact match, narrow the parameters and |
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87 | * try again! |
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88 | */ |
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89 | 39 | if (vm == null) { |
90 | ||
91 | // replace all numbers with the smallest type that will fit |
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92 | 16 | for (int i = 0; i < params.length; i++) { |
93 | 10 | Object param = params[i]; |
94 | 10 | if (param instanceof Number) { |
95 | 10 | params[i] = narrow((Number) param); |
96 | } |
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97 | } |
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98 | 6 | vm = Introspector.getUberspect().getMethod(obj, methodName, params, DUMMY); |
99 | 6 | if (vm == null) { |
100 | 0 | return null; |
101 | } |
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102 | } |
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103 | ||
104 | 39 | return vm.invoke(obj, params); |
105 | } catch (InvocationTargetException e) { |
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106 | 0 | Throwable t = e.getTargetException(); |
107 | ||
108 | 0 | if (t instanceof Exception) { |
109 | 0 | throw (Exception) t; |
110 | } |
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111 | ||
112 | 0 | throw e; |
113 | } |
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114 | } |
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115 | ||
116 | /** |
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117 | * Given a Number, return back the value using the smallest type the result |
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118 | * will fit into. This works hand in hand with parameter 'widening' in java |
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119 | * method calls, e.g. a call to substring(int,int) with an int and a long |
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120 | * will fail, but a call to substring(int,int) with an int and a short will |
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121 | * succeed. |
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122 | * |
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123 | * @param original the original number. |
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124 | * @return a value of the smallest type the original number will fit into. |
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125 | * @since 1.1 |
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126 | */ |
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127 | private Number narrow(Number original) { |
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128 | 10 | if (original == null || original instanceof BigDecimal || original instanceof BigInteger) { |
129 | 0 | return original; |
130 | } |
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131 | 10 | Number result = original; |
132 | 10 | if (original instanceof Double || original instanceof Float) { |
133 | 0 | double value = original.class="keyword">doubleValue(); |
134 | 0 | if (value <= Float.MAX_VALUE && value >= Float.MIN_VALUE) { |
135 | 0 | result = new Float(result.floatValue()); |
136 | } |
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137 | // else it was already a double |
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138 | } else { |
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139 | 10 | long value = original.class="keyword">longValue(); |
140 | 10 | if (value <= Byte.MAX_VALUE && value >= Byte.MIN_VALUE) { |
141 | // it will fit in a byte |
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142 | 10 | result = new Byte((byte) value); |
143 | 0 | } else if (value <= Short.MAX_VALUE && value >= Short.MIN_VALUE) { |
144 | 0 | result = new Short((short) value); |
145 | 0 | } else if (value <= Integer.MAX_VALUE && value >= Integer.MIN_VALUE) { |
146 | 0 | result = new Integer((int) value); |
147 | } |
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148 | // else it was already a long |
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149 | } |
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150 | 10 | return result; |
151 | } |
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152 | ||
153 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |