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org.apache.commons.jexl.util.Coercion |
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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.util; |
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17 | ||
18 | /** |
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19 | * Coercion utilities for the JSTL EL-like coercion. |
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20 | * |
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21 | * @since 1.0 |
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22 | * @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> |
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23 | */ |
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24 | 0 | public class Coercion { |
25 | ||
26 | /** |
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27 | * Coerce to a Boolean. |
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28 | * |
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29 | * @param val Object to be coerced. |
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30 | * @return The Boolean coerced value, or null if none possible. |
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31 | */ |
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32 | public static Boolean coerceBoolean(Object val) { |
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33 | 92 | if (val == null) { |
34 | 0 | return Boolean.FALSE; |
35 | 92 | } else if (val instanceof Boolean) { |
36 | 88 | return (Boolean) val; |
37 | 4 | } else if (val instanceof String) { |
38 | 4 | return Boolean.valueOf((String) val); |
39 | } |
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40 | 0 | return null; |
41 | } |
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42 | ||
43 | /** |
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44 | * Coerce to a Integer. |
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45 | * |
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46 | * @param val Object to be coerced. |
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47 | * @return The Integer coerced value. |
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48 | * @throws Exception If Integer coercion fails. |
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49 | */ |
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50 | public static Integer coerceInteger(Object val) |
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51 | throws Exception { |
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52 | 12 | if (val == null) { |
53 | 0 | return new Integer(0); |
54 | 12 | } else if (val instanceof String) { |
55 | 0 | if ("".equals(val)) { |
56 | 0 | return new Integer(0); |
57 | } |
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58 | 0 | return Integer.valueOf((String) val); |
59 | 12 | } else if (val instanceof Character) { |
60 | 0 | return new Integer(((Character) val).charValue()); |
61 | 12 | } else if (val instanceof Boolean) { |
62 | 0 | throw new Exception("Boolean->Integer coercion exception"); |
63 | 12 | } else if (val instanceof Number) { |
64 | 12 | return new Integer(((Number) val).intValue()); |
65 | } |
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66 | ||
67 | 0 | throw new Exception("Integer coercion exception"); |
68 | } |
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69 | ||
70 | /** |
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71 | * Coerce to a Long. |
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72 | * |
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73 | * @param val Object to be coerced. |
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74 | * @return The Long coerced value. |
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75 | * @throws Exception If Long coercion fails. |
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76 | */ |
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77 | public static Long coerceLong(Object val) |
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78 | throws Exception { |
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79 | 267 | if (val == null) { |
80 | 1 | return new Long(0); |
81 | 266 | } else if (val instanceof String) { |
82 | 20 | if ("".equals(val)) { |
83 | 0 | return new Long(0); |
84 | } |
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85 | 20 | return Long.valueOf((String) val); |
86 | 246 | } else if (val instanceof Character) { |
87 | 2 | return new Long(((Character) val).charValue()); |
88 | 244 | } else if (val instanceof Boolean) { |
89 | 0 | throw new Exception("Boolean->Long coercion exception"); |
90 | 244 | } else if (val instanceof Number) { |
91 | 244 | return new Long(((Number) val).longValue()); |
92 | } |
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93 | ||
94 | 0 | throw new Exception("Long coercion exception"); |
95 | } |
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96 | ||
97 | /** |
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98 | * Coerce to a Double. |
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99 | * |
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100 | * @param val Object to be coerced. |
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101 | * @return The Double coerced value. |
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102 | * @throws Exception If Double coercion fails. |
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103 | */ |
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104 | public static Double coerceDouble(Object val) |
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105 | throws Exception { |
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106 | 43 | if (val == null) { |
107 | 0 | return new Double(0); |
108 | 43 | } else if (val instanceof String) { |
109 | 6 | if ("".equals(val)) { |
110 | 0 | return new Double(0); |
111 | } |
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112 | ||
113 | /* |
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114 | * the spec seems to be iffy about this. Going to give it a wack |
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115 | * anyway |
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116 | */ |
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117 | ||
118 | 6 | return new Double((String) val); |
119 | 37 | } else if (val instanceof Character) { |
120 | 0 | int i = ((Character) val).charValue(); |
121 | ||
122 | 0 | return new Double(Double.parseDouble(String.valueOf(i))); |
123 | 37 | } else if (val instanceof Boolean) { |
124 | 0 | throw new Exception("Boolean->Double coercion exception"); |
125 | 37 | } else if (val instanceof Double) { |
126 | 6 | return (Double) val; |
127 | 31 | } else if (val instanceof Number) { |
128 | //The below construct is used rather than ((Number)val).doubleValue() to ensure |
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129 | //equality between comparint new Double( 6.4 / 3 ) and the jexl expression of 6.4 / 3 |
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130 | 31 | return new Double(Double.parseDouble(String.valueOf(val))); |
131 | } |
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132 | ||
133 | 0 | throw new Exception("Double coercion exception"); |
134 | } |
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135 | ||
136 | /** |
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137 | * Is Object a floating point number. |
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138 | * |
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139 | * @param o Object to be analyzed. |
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140 | * @return true if it is a Float or a Double. |
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141 | */ |
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142 | public static boolean isFloatingPoint(final Object o) { |
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143 | 122 | return o instanceof Float || o instanceof Double; |
144 | } |
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145 | ||
146 | /** |
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147 | * Is Object a whole number. |
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148 | * |
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149 | * @param o Object to be analyzed. |
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150 | * @return true if Integer, Long, Byte, Short or Character. |
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151 | */ |
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152 | public static boolean isNumberable(final Object o) { |
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153 | 70 | return o instanceof Integer |
154 | || o instanceof Long |
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155 | || o instanceof Byte |
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156 | || o instanceof Short |
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157 | || o instanceof Character; |
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158 | } |
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159 | ||
160 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |