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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. |
|
| 6 | * You may obtain a copy of the License at |
|
| 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 |
|
| 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. |
|
| 13 | * See the License for the specific language governing permissions and |
|
| 14 | * limitations under the License. |
|
| 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. |
|
| 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 | } |
|
| 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 | } |
|
| 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. |
|
| 75 | * @throws Exception If Long coercion fails. |
|
| 76 | */ |
|
| 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 | } |
|
| 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 | } |
|
| 96 | ||
| 97 | /** |
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| 98 | * Coerce to a Double. |
|
| 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 | } |
|
| 112 | ||
| 113 | /* |
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| 114 | * the spec seems to be iffy about this. Going to give it a wack |
|
| 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 |
|
| 129 | //equality between comparint new Double( 6.4 / 3 ) and the jexl expression of 6.4 / 3 |
|
| 130 | 31 | return new Double(Double.parseDouble(String.valueOf(val))); |
| 131 | } |
|
| 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. |
|
| 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. |
|
| 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. |
|
| 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. |
|
| 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; |
|
| 158 | } |
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| 159 | ||
| 160 | } |
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