1 | // |
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2 | // $Id: UploadPolicyFactory.java 822 2009-07-02 14:49:12Z etienne_sf $ |
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3 | // |
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4 | // jupload - A file upload applet. |
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5 | // Copyright 2007 The JUpload Team |
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6 | // |
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7 | // Created: 2006-05-06 |
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8 | // Creator: etienne_sf |
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9 | // Last modified: $Date: 2009-07-02 11:49:12 -0300 (Qui, 02 Jul 2009) $ |
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10 | // |
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11 | // This program is free software; you can redistribute it and/or modify it under |
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12 | // the terms of the GNU General Public License as published by the Free Software |
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13 | // Foundation; either version 2 of the License, or (at your option) any later |
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14 | // version. This program is distributed in the hope that it will be useful, but |
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15 | // WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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16 | // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more |
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17 | // details. You should have received a copy of the GNU General Public License |
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18 | // along with this program; if not, write to the Free Software Foundation, Inc., |
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19 | // 675 Mass Ave, Cambridge, MA 02139, USA. |
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20 | |
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21 | package wjhk.jupload2.policies; |
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22 | |
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23 | import java.lang.reflect.Constructor; |
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24 | import java.lang.reflect.InvocationTargetException; |
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25 | |
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26 | import wjhk.jupload2.context.JUploadContext; |
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27 | |
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28 | /** |
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29 | * This class is used to control creation of the uploadPolicy instance, |
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30 | * according to applet parameters (or System properties). <BR> |
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31 | * <BR> |
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32 | * The used parameters are: |
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33 | * <UL> |
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34 | * <LI>postURL: The URL where files are to be uploaded. This parameter is |
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35 | * mandatory if called from a servlet. |
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36 | * <LI>uploadPolicy: the class name to be used as a policy. Currently available |
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37 | * : not defined (then use DefaultUploadPolicy), |
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38 | * {@link wjhk.jupload2.policies.DefaultUploadPolicy}, |
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39 | * {@link wjhk.jupload2.policies.CoppermineUploadPolicy} |
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40 | * </UL> |
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41 | * |
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42 | * @author etienne_sf |
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43 | * @version $Revision: 822 $ |
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44 | */ |
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45 | public class UploadPolicyFactory { |
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46 | |
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47 | /** |
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48 | * Returns an upload Policy for the given applet and URL. All other |
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49 | * parameters for the uploadPolicy are take from avaiable applet parameters |
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50 | * (or from system properties, if it is not run as an applet). |
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51 | * |
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52 | * @param theAppletContext if not null : use this Applet Parameters. If |
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53 | * null, use System properties. |
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54 | * @return The newly created UploadPolicy. |
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55 | * @throws Exception |
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56 | */ |
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57 | public static UploadPolicy getUploadPolicy(JUploadContext theAppletContext) |
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58 | throws Exception { |
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59 | UploadPolicy uploadPolicy = theAppletContext.getUploadPolicy(); |
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60 | |
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61 | if (uploadPolicy == null) { |
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62 | // Let's create the update policy. |
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63 | String uploadPolicyStr = theAppletContext.getParameter( |
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64 | UploadPolicy.PROP_UPLOAD_POLICY, |
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65 | UploadPolicy.DEFAULT_UPLOAD_POLICY); |
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66 | int debugLevel = theAppletContext.getParameter( |
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67 | UploadPolicy.PROP_DEBUG_LEVEL, |
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68 | UploadPolicy.DEFAULT_DEBUG_LEVEL); |
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69 | |
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70 | String action = null; |
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71 | boolean usingDefaultUploadPolicy = false; |
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72 | try { |
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73 | logDebug("Trying to load the given uploadPolicy: " |
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74 | + uploadPolicyStr, debugLevel); |
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75 | |
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76 | action = uploadPolicyStr; |
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77 | Class<?> uploadPolicyClass = null; |
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78 | // Our default is "DefaultUploadPolicy", (without prefix) |
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79 | // so we try the prefixed variant first. But only, if the |
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80 | // user had specified an unqualified class name. |
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81 | if (!uploadPolicyStr.contains(".")) { |
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82 | try { |
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83 | uploadPolicyClass = Class |
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84 | .forName("wjhk.jupload2.policies." |
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85 | + uploadPolicyStr); |
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86 | logDebug("wjhk.jupload2.policies." + uploadPolicyStr |
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87 | + " class found.", debugLevel); |
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88 | } catch (ClassNotFoundException e1) { |
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89 | logDebug(e1.getClass().getName() |
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90 | + " when looking for [wjhk.jupload2.policies.]" |
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91 | + uploadPolicyStr, debugLevel); |
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92 | uploadPolicyClass = null; |
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93 | } |
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94 | } |
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95 | if (null == uploadPolicyClass) { |
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96 | // Let's try without the prefix |
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97 | try { |
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98 | uploadPolicyClass = Class.forName(uploadPolicyStr); |
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99 | logDebug(uploadPolicyStr + " class found.", debugLevel); |
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100 | } catch (ClassNotFoundException e2) { |
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101 | logDebug(e2.getClass().getName() |
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102 | + " when looking for the given uploadPolicy (" |
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103 | + uploadPolicyStr + ")", debugLevel); |
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104 | // Too bad, we don't know how to create this class. |
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105 | // Fall back to built-in default. |
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106 | usingDefaultUploadPolicy = true; |
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107 | uploadPolicyClass = Class |
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108 | .forName("wjhk.jupload2.policies.DefaultUploadPolicy"); |
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109 | logDebug( |
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110 | "Using default upload policy: wjhk.jupload2.policies.DefaultUploadPolicy", |
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111 | debugLevel); |
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112 | } |
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113 | } |
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114 | action = "constructorParameters"; |
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115 | Class<?>[] constructorParameters = { |
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116 | Class.forName("wjhk.jupload2.context.JUploadContext") |
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117 | }; |
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118 | Constructor<?> constructor = uploadPolicyClass |
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119 | .getConstructor(constructorParameters); |
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120 | Object[] params = { |
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121 | theAppletContext |
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122 | }; |
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123 | action = "newInstance"; |
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124 | uploadPolicy = (UploadPolicy) constructor.newInstance(params); |
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125 | } catch (Exception e) { |
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126 | if (e instanceof InvocationTargetException) { |
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127 | // If the policy's constructor has thrown an exception, |
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128 | // Get that "real" exception and print its details and |
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129 | // stack trace |
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130 | Throwable t = ((InvocationTargetException) e) |
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131 | .getTargetException(); |
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132 | System.out.println("-ERROR- " + e.getClass().getName() |
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133 | + " (message: " + t.getMessage() + ")"); |
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134 | t.printStackTrace(); |
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135 | } |
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136 | System.out.println("-ERROR- " + e.getClass().getName() + " in " |
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137 | + action + "(error message: " + e.getMessage() + ")"); |
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138 | throw e; |
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139 | } |
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140 | |
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141 | // The current values are displayed here, after the full |
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142 | // initialization of all classes. |
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143 | // It could also be displayed in the DefaultUploadPolicy (for |
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144 | // instance), but then, the |
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145 | // display wouldn't show the modifications done by superclasses. |
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146 | uploadPolicy.displayDebug("uploadPolicy parameter = " |
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147 | + uploadPolicyStr, 1); |
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148 | if (usingDefaultUploadPolicy) { |
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149 | uploadPolicy.displayWarn("Unable to create the '" |
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150 | + uploadPolicyStr |
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151 | + "'. Using the DefaultUploadPolicy instead."); |
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152 | } else { |
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153 | uploadPolicy.displayDebug("uploadPolicy = " |
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154 | + uploadPolicy.getClass().getName(), 20); |
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155 | } |
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156 | |
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157 | // Then, we display the applet parameter list. |
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158 | uploadPolicy.displayParameterStatus(); |
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159 | } |
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160 | |
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161 | return uploadPolicy; |
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162 | } |
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163 | |
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164 | /** |
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165 | * Help to log debug information to the user. Use of log4j, one day in the |
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166 | * future, would help. |
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167 | * |
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168 | * @param currentDebugLevel |
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169 | */ |
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170 | private static void logDebug(String msg, int currentDebugLevel) { |
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171 | if (currentDebugLevel > 0) { |
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172 | System.out.println("[DEBUG] " + msg); |
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173 | } |
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174 | } |
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175 | } |
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