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org.apache.turbine.services.factory.TurbineFactory |
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1 | package org.apache.turbine.services.factory; |
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2 | ||
3 | /* |
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4 | * Copyright 2001-2005 The Apache Software Foundation. |
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5 | * |
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6 | * Licensed under the Apache License, Version 2.0 (the "License") |
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7 | * you may not use this file except in compliance with the License. |
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8 | * You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | ||
19 | import org.apache.turbine.services.TurbineServices; |
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20 | import org.apache.turbine.util.TurbineException; |
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21 | ||
22 | /** |
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23 | * The Factory Service instantiates objects using either default |
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24 | * class loaders or a specified one. Whether specified class |
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25 | * loaders are supported for a class depends on implementation |
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26 | * and can be tested with the isLoaderSupported method. |
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27 | * |
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28 | * @author <a href="mailto:ilkka.priha@simsoft.fi">Ilkka Priha</a> |
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29 | * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> |
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30 | * @version $Id: TurbineFactory.java 264148 2005-08-29 14:21:04Z henning $ |
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31 | */ |
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32 | 0 | public abstract class TurbineFactory |
33 | { |
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34 | /** |
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35 | * Utility method for accessing the service |
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36 | * implementation |
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37 | * |
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38 | * @return An AssemblerBroker implementation instance |
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39 | */ |
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40 | public static FactoryService getService() |
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41 | { |
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42 | 352 | return (FactoryService) TurbineServices.getInstance() |
43 | .getService(FactoryService.SERVICE_NAME); |
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44 | } |
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45 | /** |
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46 | * Gets an instance of a named class. |
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47 | * |
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48 | * @param className the name of the class. |
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49 | * @return the instance. |
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50 | * @throws TurbineException if instantiation fails. |
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51 | */ |
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52 | public static Object getInstance(String className) |
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53 | throws TurbineException |
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54 | { |
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55 | 308 | return getService().getInstance(className); |
56 | } |
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57 | ||
58 | /** |
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59 | * Gets an instance of a named class using a specified class loader. |
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60 | * |
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61 | * <p>Class loaders are supported only if the isLoaderSupported |
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62 | * method returns true. Otherwise the loader parameter is ignored. |
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63 | * |
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64 | * @param className the name of the class. |
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65 | * @param loader the class loader. |
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66 | * @return the instance. |
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67 | * @throws TurbineException if instantiation fails. |
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68 | */ |
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69 | public static Object getInstance(String className, |
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70 | ClassLoader loader) |
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71 | throws TurbineException |
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72 | { |
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73 | 0 | return getService().getInstance(className, |
74 | loader); |
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75 | } |
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76 | ||
77 | /** |
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78 | * Gets an instance of a named class. |
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79 | * Parameters for its constructor are given as an array of objects, |
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80 | * primitive types must be wrapped with a corresponding class. |
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81 | * |
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82 | * @param className the name of the class. |
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83 | * @param params an array containing the parameters of the constructor. |
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84 | * @param signature an array containing the signature of the constructor. |
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85 | * @return the instance. |
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86 | * @throws TurbineException if instantiation fails. |
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87 | */ |
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88 | public static Object getInstance(String className, |
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89 | Object[] params, |
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90 | String[] signature) |
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91 | throws TurbineException |
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92 | { |
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93 | 0 | return getService().getInstance(className, |
94 | params, |
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95 | signature); |
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96 | } |
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97 | ||
98 | /** |
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99 | * Gets an instance of a named class using a specified class loader. |
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100 | * Parameters for its constructor are given as an array of objects, |
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101 | * primitive types must be wrapped with a corresponding class. |
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102 | * |
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103 | * <p>Class loaders are supported only if the isLoaderSupported |
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104 | * method returns true. Otherwise the loader parameter is ignored. |
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105 | * |
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106 | * @param className the name of the class. |
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107 | * @param loader the class loader. |
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108 | * @param params an array containing the parameters of the constructor. |
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109 | * @param signature an array containing the signature of the constructor. |
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110 | * @return the instance. |
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111 | * @throws TurbineException if instantiation fails. |
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112 | */ |
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113 | public static Object getInstance(String className, |
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114 | ClassLoader loader, |
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115 | Object[] params, |
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116 | String[] signature) |
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117 | throws TurbineException |
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118 | { |
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119 | 0 | return getService().getInstance(className, |
120 | loader, |
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121 | params, |
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122 | signature); |
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123 | } |
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124 | ||
125 | ||
126 | /** |
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127 | * Tests if specified class loaders are supported for a named class. |
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128 | * |
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129 | * @param className the name of the class. |
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130 | * @return true if class loaders are supported, false otherwise. |
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131 | * @throws TurbineException if test fails. |
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132 | */ |
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133 | public static boolean isLoaderSupported(String className) |
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134 | throws TurbineException |
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135 | { |
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136 | 0 | return getService().isLoaderSupported(className); |
137 | } |
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138 | ||
139 | /** |
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140 | * Gets the signature classes for parameters of a method of a class. |
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141 | * |
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142 | * @param clazz the class. |
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143 | * @param params an array containing the parameters of the method. |
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144 | * @param signature an array containing the signature of the method. |
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145 | * @return an array of signature classes. Note that in some cases |
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146 | * objects in the parameter array can be switched to the context |
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147 | * of a different class loader. |
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148 | * @throws ClassNotFoundException if any of the classes is not found. |
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149 | */ |
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150 | public static Class[] getSignature(Class clazz, |
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151 | Object params[], |
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152 | String signature[]) |
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153 | throws ClassNotFoundException |
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154 | { |
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155 | 0 | return getService().getSignature(clazz, params, signature); |
156 | } |
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157 | } |
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