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| org.apache.commons.jexl.util.Coercion | 
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| 1 |  /* | |
| 2 |   * Copyright 2002,2004 The Apache Software Foundation. | |
| 3 |   * | |
| 4 |   * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 |   * you may not use this file except in compliance with the License. | |
| 6 |   * You may obtain a copy of the License at | |
| 7 |   * | |
| 8 |   *      http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 |   * | |
| 10 |   * Unless required by applicable law or agreed to in writing, software | |
| 11 |   * distributed under the License is distributed on an "AS IS" BASIS, | |
| 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 |   */ | |
| 16 |  package org.apache.commons.jexl.util; | |
| 17 | ||
| 18 |  /** | |
| 19 |   *  Coercion utilities for the JSTL EL-like coercion. | |
| 20 |   * | |
| 21 |   *  @since 1.0 | |
| 22 |   *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a> | |
| 23 |   */ | |
| 24 | 0 |  public class Coercion { | 
| 25 | ||
| 26 |      /** | |
| 27 |       * Coerce to a Boolean. | |
| 28 |       * | |
| 29 |       * @param val Object to be coerced. | |
| 30 |       * @return The Boolean coerced value, or null if none possible. | |
| 31 |       */ | |
| 32 | public static Boolean coerceBoolean(Object val) { | |
| 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 | } | |
| 40 | 0 |          return null; | 
| 41 | } | |
| 42 | ||
| 43 |      /** | |
| 44 |       * Coerce to a Integer. | |
| 45 |       * | |
| 46 |       * @param val Object to be coerced. | |
| 47 |       * @return The Integer coerced value. | |
| 48 |       * @throws Exception If Integer coercion fails. | |
| 49 |       */ | |
| 50 | public static Integer coerceInteger(Object val) | |
| 51 |      throws Exception { | |
| 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 | } | |
| 66 | ||
| 67 | 0 |          throw new Exception("Integer coercion exception"); | 
| 68 | } | |
| 69 | ||
| 70 |      /** | |
| 71 |       * Coerce to a Long. | |
| 72 |       * | |
| 73 |       * @param val Object to be coerced. | |
| 74 |       * @return The Long coerced value. | |
| 75 |       * @throws Exception If Long coercion fails. | |
| 76 |       */ | |
| 77 | public static Long coerceLong(Object val) | |
| 78 |      throws Exception { | |
| 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 | } | |
| 93 | ||
| 94 | 0 |          throw new Exception("Long coercion exception"); | 
| 95 | } | |
| 96 | ||
| 97 |      /** | |
| 98 |       * Coerce to a Double. | |
| 99 |       * | |
| 100 |       * @param val Object to be coerced. | |
| 101 |       * @return The Double coerced value. | |
| 102 |       * @throws Exception If Double coercion fails. | |
| 103 |       */ | |
| 104 | public static Double coerceDouble(Object val) | |
| 105 |      throws Exception { | |
| 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 |              /* | |
| 114 |               * the spec seems to be iffy about this.  Going to give it a wack | |
| 115 |               *  anyway | |
| 116 |               */ | |
| 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 | } | |
| 135 | ||
| 136 |      /** | |
| 137 |       * Is Object a floating point number. | |
| 138 |       * | |
| 139 |       * @param o Object to be analyzed. | |
| 140 |       * @return true if it is a Float or a Double. | |
| 141 |       */ | |
| 142 | public static boolean isFloatingPoint(final Object o) { | |
| 143 | 122 |          return o instanceof Float || o instanceof Double; | 
| 144 | } | |
| 145 | ||
| 146 |      /** | |
| 147 |       * Is Object a whole number. | |
| 148 |       * | |
| 149 |       * @param o Object to be analyzed. | |
| 150 |       * @return true if Integer, Long, Byte, Short or Character. | |
| 151 |       */ | |
| 152 | public static boolean isNumberable(final Object o) { | |
| 153 | 70 |          return o instanceof Integer | 
| 154 | || o instanceof Long | |
| 155 | || o instanceof Byte | |
| 156 | || o instanceof Short | |
| 157 | || o instanceof Character; | |
| 158 | } | |
| 159 | ||
| 160 | } | 
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