1 | package eu.clarin.cmdi.mdservice.action; |
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2 | |
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3 | import java.io.IOException; |
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4 | import java.io.InputStream; |
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5 | import java.util.HashMap; |
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6 | |
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7 | import javax.servlet.http.HttpServletRequest; |
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8 | |
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9 | import org.apache.log4j.Logger; |
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10 | import org.apache.struts2.interceptor.ServletRequestAware; |
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11 | |
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12 | import com.opensymphony.xwork2.ActionSupport; |
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13 | |
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14 | import eu.clarin.cmdi.mdservice.internal.Cache; |
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15 | import eu.clarin.cmdi.mdservice.internal.MDTransformer; |
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16 | import eu.clarin.cmdi.mdservice.internal.NoStylesheetException; |
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17 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
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18 | import eu.clarin.cmdi.mdservice.proxy.GenericProxy; |
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19 | |
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20 | |
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21 | |
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22 | /** |
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23 | * main Struts2 controller (ie implemenets the struts' execute()-method), all other Actions are derived from. |
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24 | * Defines the methods used for retrieving the data |
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25 | * and provides basic implementation where possible. |
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26 | * Also responsible for caching and transformation of the result. |
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27 | * |
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28 | * @author vronk |
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29 | */ |
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30 | public class GenericAction extends ActionSupport |
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31 | implements ServletRequestAware |
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32 | { |
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33 | public static Logger log = Logger.getLogger("GenericAction"); |
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34 | private static final long serialVersionUID = 1L; |
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35 | |
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36 | |
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37 | private Diagnostics diagnostics; |
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38 | /** |
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39 | * Properties to be filled by Struts with according request-parameters |
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40 | */ |
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41 | private String actionkey = "generic"; |
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42 | private String cache = Cache.USE; |
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43 | private String lang="en"; |
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44 | private String format="xml"; // default no transformation |
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45 | private String actionContentType; |
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46 | private String userMsg; |
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47 | private HttpServletRequest request; |
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48 | private long duration = 0; |
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49 | private String repository; |
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50 | private InputStream resultStream; |
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51 | private InputStream sourceStream; |
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52 | |
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53 | // protected URL base_url ; |
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54 | |
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55 | private GenericProxy target_proxy; |
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56 | |
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57 | |
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58 | public GenericAction(){ |
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59 | super(); |
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60 | // initialize(); |
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61 | } |
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62 | |
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63 | public GenericProxy getTargetProxy() { |
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64 | return target_proxy; |
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65 | } |
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66 | |
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67 | public void setTargetProxy(GenericProxy proxy) { |
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68 | target_proxy = proxy; |
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69 | } |
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70 | |
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71 | public Diagnostics getDiagnostics(){ |
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72 | return this.diagnostics; |
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73 | } |
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74 | |
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75 | public void setDiagnostics(Diagnostics diagnostics){ |
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76 | this.diagnostics = diagnostics; |
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77 | } |
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78 | public Diagnostics Diagnostics(){ |
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79 | if (diagnostics == null){ |
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80 | diagnostics = new Diagnostics(); |
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81 | } |
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82 | return this.diagnostics; |
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83 | } |
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84 | |
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85 | public String getCache() { |
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86 | return cache; |
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87 | } |
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88 | |
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89 | public void setCache(String cache) { |
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90 | this.cache = cache; |
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91 | } |
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92 | |
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93 | public String getFormat() { |
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94 | return format; |
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95 | } |
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96 | |
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97 | public void setFormat(String format) { |
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98 | this.format = format; |
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99 | } |
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100 | |
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101 | public void setRepository(String repository) { |
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102 | this.repository = repository; |
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103 | } |
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104 | |
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105 | public String getRepository() { |
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106 | //default repository = 1 (set on init) |
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107 | return repository; |
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108 | } |
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109 | |
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110 | /** |
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111 | * is used in struts.xml to dynamically set the mime-type of the result, depending on the format-parameter |
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112 | * @return |
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113 | */ |
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114 | public String getActionContentType() { |
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115 | if (format.toLowerCase().startsWith("html")) { |
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116 | this.actionContentType = "text/html"; |
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117 | //this.actionContentType = "application/xhtml+xml"; |
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118 | } else { |
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119 | this.actionContentType = "text/xml"; |
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120 | } |
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121 | |
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122 | return actionContentType; |
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123 | } |
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124 | |
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125 | public void setActionContentType(String actionContentType) { |
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126 | this.actionContentType = actionContentType; |
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127 | } |
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128 | |
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129 | public String getActionkey() { |
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130 | return actionkey; |
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131 | } |
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132 | |
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133 | public void setActionkey(String actionKey) { |
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134 | actionkey = actionKey; |
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135 | } |
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136 | |
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137 | public String getLang() { |
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138 | return lang; |
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139 | } |
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140 | |
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141 | public void setLang(String lang) { |
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142 | this.lang = lang; |
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143 | } |
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144 | |
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145 | public String getFullFormat() { |
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146 | return actionkey + "2" + format; |
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147 | } |
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148 | |
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149 | |
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150 | /** |
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151 | * TODO: this should be replaced by the diagnostics-mechanism |
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152 | * @return |
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153 | */ |
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154 | public String getUserMsg() { |
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155 | return userMsg; |
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156 | } |
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157 | |
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158 | public void setUserMsg(String userMsg) { |
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159 | this.userMsg = this.userMsg + "\n" + userMsg; |
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160 | } |
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161 | |
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162 | /** |
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163 | * TODO: check what this does, where it is used? |
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164 | * @return |
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165 | */ |
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166 | @Override |
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167 | public void setServletRequest(HttpServletRequest arg0) { |
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168 | request = arg0; |
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169 | } |
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170 | |
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171 | public HttpServletRequest getServletRequest() { |
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172 | return request; |
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173 | } |
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174 | |
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175 | /** |
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176 | * The stream holding the resulting data to be sent back to the user as response |
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177 | * @return |
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178 | */ |
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179 | public InputStream getResultStream() { |
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180 | return resultStream; |
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181 | } |
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182 | public void setResultStream(InputStream _resultStream){ |
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183 | resultStream = _resultStream; |
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184 | } |
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185 | public void setSourceStream(InputStream _sourceStream){ |
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186 | sourceStream = _sourceStream; |
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187 | } |
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188 | |
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189 | /* |
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190 | public InputStream getSourceStream() throws IOException { |
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191 | return getTargetRequest().openStream(); |
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192 | } |
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193 | */ |
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194 | |
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195 | /** |
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196 | * Constructs an unambiguous key for the request (encoding all the parameters). |
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197 | * This is used as identifier for caching |
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198 | * @return key unambiguously encoding the request |
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199 | */ |
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200 | |
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201 | public String getRequestKey() { |
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202 | String key=""; |
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203 | if (getActionkey()!=null) { |
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204 | key += getActionkey() + "//-" ; |
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205 | }else { |
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206 | key +="//-" ; |
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207 | } |
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208 | /*if (getQ()!=null) { |
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209 | key += getQ() + "//-" ; |
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210 | } else { |
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211 | key +="//-" ; |
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212 | } |
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213 | if (getCollection()!=null) { |
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214 | key += getCollection() + "//-"; |
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215 | } else { |
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216 | key +="//-" ; |
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217 | } |
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218 | if (getSquery()!=null) { |
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219 | key += getSquery() + "//-" ; |
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220 | } else { |
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221 | key +="//-" ; |
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222 | } |
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223 | if (getStartItem()!=null) { |
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224 | key += getStartItem() + "//-"; |
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225 | } |
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226 | else{ |
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227 | key +="//-" ; |
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228 | } |
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229 | if (getMaximumItems()!=null) { |
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230 | key += getMaximumItems() + "//-"; |
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231 | } |
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232 | else{ |
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233 | key +="//-" ; |
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234 | } |
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235 | |
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236 | key += getRepository() + "//-"; |
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237 | key += getMaxdepth() + "//-"; |
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238 | |
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239 | if (getLang()!=null) { |
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240 | key += getLang() + "//-"; |
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241 | }else{ |
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242 | key +="//-" ; |
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243 | } |
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244 | */ |
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245 | return key; |
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246 | } |
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247 | |
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248 | /** |
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249 | * Get the sourceStream from the target proxy |
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250 | * @return |
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251 | * @throws IOException |
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252 | * @throws NoStylesheetException |
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253 | */ |
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254 | public InputStream getSourceStream() throws IOException, NoStylesheetException { |
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255 | return getTargetProxy().getSourceStream(); |
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256 | } |
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257 | |
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258 | public String addDurationKey(){ |
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259 | String req_key = getRequestKey(); |
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260 | |
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261 | Double duration_d; |
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262 | |
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263 | duration_d = (double)duration; |
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264 | duration_d = duration_d/1000.0; |
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265 | req_key += duration_d + "//-"; |
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266 | return req_key; |
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267 | } |
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268 | |
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269 | public HashMap<String,String> createTransformerParams(){ |
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270 | |
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271 | HashMap<String,String> hm = new HashMap<String,String>(); |
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272 | |
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273 | if (getFullFormat() != null){ |
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274 | hm.put("format", getFullFormat()); |
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275 | } |
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276 | /* |
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277 | if (getColumns() != null){ |
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278 | hm.put("cols", getColumns()); |
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279 | } else { |
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280 | hm.put("cols", ""); |
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281 | } |
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282 | if (getStartItem() != null){ |
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283 | hm.put("startItem", getStartItem()); |
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284 | } |
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285 | if (getMaximumItems() != null){ |
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286 | hm.put("maximumItems", getMaximumItems()); |
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287 | } |
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288 | if (getLang() != null){ |
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289 | hm.put("lang", getLang()); |
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290 | } |
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291 | if (getQ() != null){ |
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292 | hm.put("q", getQ()); |
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293 | } |
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294 | //if (getRepository() != null){ |
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295 | hm.put("repository_name", String.valueOf(getRepository())); |
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296 | hm.put("repository_type", WorkspaceProfile.getRepositoryType(this.getRepository())); |
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297 | //} |
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298 | */ |
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299 | return hm; |
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300 | |
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301 | } |
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302 | |
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303 | /** |
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304 | * This is the work-horse function. |
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305 | * It does two things: |
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306 | * a) check if the source data is already in cache (based on cache-key that is constructed from the request parameters) |
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307 | * b) if format-parameter provided, invokes the transformation. |
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308 | * at the end the data to be returned as result is contained in the resultStream |
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309 | * If format is xml, then the data from sourceStream is passed further as resultStream. |
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310 | * |
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311 | * @throws Exception This is handled by struts (is mapped to some result in struts.xml based on the Exception-Class) |
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312 | */ |
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313 | |
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314 | public void prepare() throws Exception { |
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315 | |
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316 | String req_key = getRequestKey(); |
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317 | log.debug("request_key: " + req_key); |
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318 | log.debug(getActionkey() + ".targetURL: " + getTargetProxy().getTargetRequest() + " .format:" + getFullFormat()); |
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319 | |
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320 | // Caching |
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321 | String xcid; |
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322 | |
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323 | if (getCache().equals(Cache.SKIP)) { |
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324 | |
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325 | sourceStream = getSourceStream(); |
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326 | |
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327 | } else { |
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328 | if (getCache().equals(Cache.USE)) { |
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329 | sourceStream = Cache.getCache().getFromCache(req_key); |
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330 | } |
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331 | if (sourceStream == null) { // either not in cache or cache_flag=refresh |
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332 | //sourceStream = getTargetRequest().openStream(); |
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333 | long startMillis = System.currentTimeMillis(); |
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334 | sourceStream = getSourceStream(); |
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335 | duration = System.currentTimeMillis() - startMillis; |
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336 | req_key = addDurationKey(); |
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337 | |
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338 | long now = System.currentTimeMillis(); |
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339 | xcid = Cache.getCache().putInCache(req_key,sourceStream); |
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340 | //Admin.notifyUser("putting in cache: " + req_key); |
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341 | sourceStream = Cache.getCache().getFromCache(req_key); |
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342 | } /* else { |
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343 | Admin.notifyUser("reading from cache: " + req_key); |
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344 | } */ |
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345 | } |
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346 | |
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347 | if (format.equals("xml")) { |
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348 | resultStream = sourceStream; |
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349 | }else { |
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350 | MDTransformer transformer = new MDTransformer(); |
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351 | // set URL as srcFile (for MDTransformer to pass to xsl-scripts) |
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352 | // TODO: WHY?? |
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353 | transformer.setSrcFile(getTargetProxy().getTargetRequest()); |
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354 | transformer.setParams(createTransformerParams()); |
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355 | // here the transformation is invoked |
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356 | resultStream = transformer.transformXML(sourceStream); |
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357 | } |
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358 | |
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359 | log.debug(getActionkey() + " success:" + (resultStream!=null)); |
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360 | } |
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361 | |
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362 | /** |
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363 | * default Action method that gets called by Struts. Everything interesting happens in prepare() |
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364 | */ |
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365 | public String execute() throws Exception { |
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366 | // HttpServletRequest request = ServletActionContext.getRequest(); |
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367 | //Admin.notifyUser("session-attrs:"); |
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368 | //Admin.notifyUser(getServletRequest().getRemoteUser() ); |
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369 | //Admin.notifyUser(String.valueOf(getSession())); |
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370 | |
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371 | long now = System.currentTimeMillis(); |
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372 | |
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373 | prepare(); |
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374 | long duration = (System.currentTimeMillis() - now); |
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375 | //duration |
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376 | |
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377 | if (resultStream == null) { |
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378 | return ERROR; |
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379 | } else { |
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380 | return SUCCESS; |
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381 | } |
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382 | } |
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383 | |
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384 | |
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385 | } |
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