1 | package eu.clarin.cmdi.mdservice.action; |
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2 | |
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3 | import java.io.ByteArrayInputStream; |
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4 | import java.io.IOException; |
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5 | import java.io.InputStream; |
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6 | import java.io.StringWriter; |
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7 | import java.net.URLConnection; |
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8 | import java.util.HashMap; |
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9 | import java.util.Map; |
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10 | |
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11 | import javax.servlet.http.HttpServletRequest; |
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12 | import javax.xml.transform.TransformerFactory; |
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13 | import javax.xml.transform.dom.DOMSource; |
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14 | import javax.xml.transform.stream.StreamResult; |
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15 | |
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16 | import org.apache.log4j.Logger; |
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17 | import org.apache.struts2.interceptor.ServletRequestAware; |
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18 | import org.w3c.dom.Document; |
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19 | import org.w3c.dom.Node; |
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20 | |
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21 | import com.opensymphony.xwork2.ActionSupport; |
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22 | |
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23 | import eu.clarin.cmdi.mdservice.internal.Cache; |
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24 | import eu.clarin.cmdi.mdservice.internal.Helpers; |
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25 | import eu.clarin.cmdi.mdservice.internal.MDTransformer; |
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26 | import eu.clarin.cmdi.mdservice.internal.NoStylesheetException; |
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27 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
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28 | import eu.clarin.cmdi.mdservice.model.WorkspaceProfile; |
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29 | import eu.clarin.cmdi.mdservice.proxy.ProxyInterface; |
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30 | |
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31 | |
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32 | |
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33 | /** |
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34 | * main Struts2 controller (ie implemenets the struts' execute()-method), all other Actions are derived from. |
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35 | * Defines the methods used for retrieving the data |
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36 | * and provides basic implementation where possible. |
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37 | * Also responsible for caching and transformation of the result. |
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38 | * |
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39 | * @author vronk |
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40 | */ |
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41 | public class GenericAction extends ActionSupport |
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42 | implements ServletRequestAware |
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43 | { |
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44 | public static Logger log = Logger.getLogger("GenericAction"); |
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45 | private static final long serialVersionUID = 1L; |
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46 | |
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47 | |
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48 | private Diagnostics diagnostics; |
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49 | /** |
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50 | * Properties to be filled by Struts with according request-parameters |
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51 | */ |
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52 | private String actionkey = "generic"; |
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53 | private String q; |
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54 | private String format = "xml"; |
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55 | |
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56 | private String actionContentType; |
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57 | private String userMsg; |
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58 | private HttpServletRequest request; |
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59 | private long duration = 0; |
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60 | private InputStream resultStream; |
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61 | private InputStream sourceStream; |
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62 | |
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63 | private Map<String,String[]> params; |
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64 | |
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65 | private ProxyInterface target_proxy; |
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66 | |
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67 | |
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68 | public ProxyInterface getTargetProxy() { |
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69 | return target_proxy; |
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70 | } |
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71 | |
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72 | public void setTargetProxy(ProxyInterface proxy) { |
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73 | target_proxy = proxy; |
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74 | target_proxy.setSourceAction(this); |
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75 | } |
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76 | |
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77 | /** |
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78 | * Empty implementation, subclasses have to decide themselves, which proxy to take. |
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79 | */ |
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80 | public void setTargetProxy() { |
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81 | } |
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82 | |
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83 | public Diagnostics getDiagnostics(){ |
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84 | if (diagnostics == null){ |
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85 | diagnostics = new Diagnostics(); |
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86 | } |
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87 | return this.diagnostics; |
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88 | } |
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89 | |
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90 | public void setDiagnostics(Diagnostics diagnostics){ |
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91 | this.diagnostics = diagnostics; |
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92 | } |
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93 | |
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94 | public String getQ() { |
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95 | return q; |
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96 | } |
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97 | |
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98 | public void setQ(String q) { |
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99 | this.q = q; |
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100 | } |
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101 | |
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102 | public void setFormat(String format) { |
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103 | this.format = format; |
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104 | } |
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105 | |
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106 | public String getActionkey() { |
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107 | return actionkey; |
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108 | } |
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109 | |
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110 | public void setActionkey(String actionKey) { |
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111 | actionkey = actionKey; |
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112 | } |
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113 | |
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114 | public String getScanClause() { |
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115 | return getParam("scanClause"); |
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116 | } |
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117 | public String getRecordPacking() { |
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118 | return getParam("recordPacking"); |
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119 | } |
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120 | public String getQuery() { |
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121 | return getParam("query"); |
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122 | } |
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123 | public String getStartRecord() { |
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124 | return getParam("startRecord"); |
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125 | } |
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126 | public String getMaximumRecords() { |
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127 | return getParam("maximumRecords"); |
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128 | } |
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129 | public String getFormat() { |
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130 | return getParam("format"); |
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131 | } |
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132 | public String getCache() { |
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133 | return getParam("cache"); |
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134 | } |
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135 | public String getRepository() { |
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136 | return getParam("repository"); |
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137 | } |
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138 | public String getLang() { |
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139 | return getParam("lang"); |
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140 | } |
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141 | public String getCollections() { |
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142 | return getParam("collections"); |
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143 | } |
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144 | public String getColumns() { |
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145 | return getParam("columns"); |
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146 | } |
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147 | public String getMaxdepth() { |
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148 | return getParam("maxdepth"); |
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149 | } |
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150 | |
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151 | |
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152 | /** |
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153 | * is used in struts.xml to dynamically set the mime-type of the result, depending on the format-parameter |
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154 | * @return |
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155 | */ |
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156 | public String getActionContentType() { |
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157 | if (this.getFormat().toLowerCase().startsWith("html")) { |
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158 | this.actionContentType = "text/html"; |
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159 | //this.actionContentType = "application/xhtml+xml"; |
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160 | } else { |
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161 | this.actionContentType = "text/xml"; |
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162 | } |
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163 | |
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164 | return actionContentType; |
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165 | } |
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166 | |
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167 | public void setActionContentType(String actionContentType) { |
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168 | this.actionContentType = actionContentType; |
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169 | } |
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170 | |
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171 | |
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172 | public String getFullFormat() { |
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173 | return actionkey + "2" + getFormat(); |
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174 | } |
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175 | |
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176 | |
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177 | /** |
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178 | * TODO: this should be replaced by the diagnostics-mechanism |
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179 | * @return |
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180 | */ |
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181 | public String getUserMsg() { |
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182 | return userMsg; |
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183 | } |
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184 | |
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185 | public void setUserMsg(String userMsg) { |
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186 | this.userMsg = this.userMsg + "\n" + userMsg; |
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187 | } |
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188 | |
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189 | /** |
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190 | * needed to acquire the original ServletRequest |
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191 | * (want to access the raw params - in loadParams()) |
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192 | * @return |
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193 | */ |
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194 | @Override |
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195 | public void setServletRequest(HttpServletRequest arg0) { |
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196 | request = arg0; |
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197 | } |
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198 | |
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199 | public HttpServletRequest getServletRequest() { |
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200 | return request; |
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201 | } |
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202 | |
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203 | /** |
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204 | * The stream holding the resulting data to be sent back to the user as response |
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205 | * @return |
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206 | */ |
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207 | public InputStream getResultStream() { |
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208 | return resultStream; |
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209 | } |
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210 | public void setResultStream(InputStream _resultStream){ |
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211 | resultStream = _resultStream; |
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212 | } |
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213 | public void setSourceStream(InputStream _sourceStream){ |
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214 | sourceStream = _sourceStream; |
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215 | } |
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216 | |
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217 | |
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218 | /** |
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219 | * Get the sourceStream from the target proxy |
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220 | * @return |
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221 | * @throws IOException |
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222 | * @throws NoStylesheetException |
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223 | */ |
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224 | public InputStream getSourceStream() throws IOException, NoStylesheetException { |
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225 | return getTargetProxy().getSourceStream(); |
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226 | } |
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227 | |
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228 | /** |
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229 | * Reads in all the parameters of the request into an internal structure. |
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230 | * the Map is not Map<String,String>, but rather Map<String,String[]>, |
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231 | * ie the value is an array of Strings! <a href="http://download.oracle.com/docs/cd/E17802_01/webservices/webservices/docs/1.5/api/javax/servlet/ServletRequest.html#getParameterMap%28%29" >javadocs:ServletRequest.getParameterMap()</a> |
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232 | * |
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233 | * This shall allow more flexibility in using the parameters in the subclasses (and less getter/setter stuff) |
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234 | * at the cost of circumventing the Struts-way. |
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235 | */ |
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236 | public void addParam(String key, String value){ |
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237 | String[] sarr = new String[1]; |
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238 | sarr[0] = value; |
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239 | params.put(key, sarr); |
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240 | } |
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241 | |
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242 | /* |
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243 | * sru params |
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244 | * /* |
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245 | * version |
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246 | * operation |
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247 | * query |
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248 | * scanClause |
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249 | * startRecord |
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250 | * maximumRecords |
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251 | * recordPacking |
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252 | * recordSchema |
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253 | * recordXPath |
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254 | * resultSetTTL |
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255 | * sortKeys |
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256 | * stylesheet |
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257 | * x-cmd-repository |
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258 | * x-cmd-collections |
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259 | * x-cmd-columns |
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260 | * x-cmd-lang |
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261 | * x-cmd-format |
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262 | * x-cmd-cache |
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263 | * x-cmd-maxdepth |
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264 | */ |
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265 | @SuppressWarnings("unchecked") |
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266 | protected void loadParams() { |
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267 | params = new HashMap(getServletRequest().getParameterMap()); |
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268 | |
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269 | if (getQ() != null) { |
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270 | addParam("q",getQ()); |
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271 | } |
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272 | |
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273 | // set defaults |
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274 | if ( params.get("version") == null){ |
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275 | addParam("version","1.2"); |
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276 | } |
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277 | if ( params.get("operation") == null){ |
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278 | addParam("operation","searchRetrieve"); |
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279 | } |
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280 | if ( params.get("query") == null){ |
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281 | addParam("query",getParam("q")); |
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282 | } |
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283 | if ( params.get("startRecord") == null){ |
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284 | addParam("startRecord","1"); |
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285 | } |
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286 | if ( params.get("maximumRecords") == null){ |
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287 | addParam("maximumRecords","50"); |
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288 | } |
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289 | |
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290 | if ( params.get("x-cmd-maxdepth") == null){ |
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291 | if (params.get("maxdepth") == null){ |
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292 | addParam("maxdepth","2"); |
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293 | } |
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294 | } else { |
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295 | addParam("maxdepth",params.get("x-cmd-maxdepth")[0]); |
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296 | } |
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297 | |
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298 | if ( params.get("x-cmd-repository") == null){ |
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299 | if (params.get("repository") == null){ |
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300 | addParam("repository",WorkspaceProfile.getRepositoryByIndex(0)); |
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301 | } |
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302 | } else { |
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303 | addParam("repository",params.get("x-cmd-repository")[0]); |
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304 | } |
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305 | |
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306 | if ( params.get("x-cmd-cache") == null){ |
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307 | if (params.get("cache") == null){ |
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308 | addParam("cache",Cache.SKIP); |
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309 | } |
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310 | } else { |
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311 | addParam("cache",params.get("x-cmd-cache")[0]); |
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312 | } |
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313 | |
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314 | if ( params.get("x-cmd-lang") == null){ |
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315 | if (params.get("lang") == null){ |
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316 | addParam("lang","en"); |
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317 | } |
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318 | } else { |
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319 | addParam("lang",params.get("x-cmd-lang")[0]); |
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320 | } |
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321 | |
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322 | if ( params.get("x-cmd-format") == null){ |
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323 | if (params.get("format") == null){ |
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324 | if (this.format == null) { |
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325 | addParam("format","xml"); |
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326 | } else if (this.format.equals("")){ |
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327 | addParam("format","xml"); |
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328 | } else { |
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329 | addParam("format",this.format); |
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330 | } |
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331 | } |
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332 | } else { |
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333 | addParam("format",params.get("x-cmd-format")[0]); |
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334 | } |
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335 | |
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336 | addParam("fullformat",getFullFormat()); |
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337 | |
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338 | } |
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339 | |
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340 | public Map<String,String[]> getParams() { |
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341 | return params; |
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342 | } |
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343 | |
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344 | |
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345 | /** |
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346 | * This is for simplified access to the the values of the request-parameters |
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347 | * They are stored in the parameters-map as a String-array, |
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348 | * but in most(?) situations, we expect just a simple string. |
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349 | * @param key |
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350 | * @return |
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351 | */ |
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352 | public String getParam(String key) { |
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353 | String v = ""; |
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354 | if (!(params.get(key)==null)) v=(String)params.get(key)[0]; |
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355 | return v; |
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356 | } |
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357 | |
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358 | public String[] getParamArray(String key) { |
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359 | String[] a = null; |
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360 | if (!(params.get(key)==null)) a=(String[])params.get(key); |
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361 | return a; |
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362 | } |
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363 | |
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364 | /** |
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365 | * Constructs an unambiguous key for the request (encoding all the parameters). |
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366 | * This is used as identifier for caching |
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367 | * @return key unambiguously encoding the request |
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368 | */ |
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369 | |
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370 | public String getRequestKey() { |
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371 | String key=""; |
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372 | if (getActionkey()!=null) { |
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373 | key += getActionkey() + "//-" ; |
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374 | }else { |
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375 | key +="//-" ; |
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376 | } |
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377 | if (getQuery()!=null) { |
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378 | key += getQuery() + "//-" ; |
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379 | } else { |
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380 | key +="//-" ; |
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381 | } |
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382 | if (getCollections()!=null) { |
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383 | key += getCollections() + "//-"; |
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384 | } else { |
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385 | key +="//-" ; |
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386 | } |
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387 | if (this.getStartRecord()!=null) { |
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388 | key += getStartRecord() + "//-"; |
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389 | } |
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390 | else{ |
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391 | key +="//-" ; |
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392 | } |
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393 | if (getMaximumRecords()!=null) { |
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394 | key += getMaximumRecords() + "//-"; |
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395 | } |
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396 | else{ |
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397 | key +="//-" ; |
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398 | } |
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399 | |
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400 | key += getRepository() + "//-"; |
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401 | key += getMaxdepth() + "//-"; |
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402 | |
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403 | if (getLang()!=null) { |
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404 | key += getLang() + "//-"; |
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405 | }else{ |
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406 | key +="//-" ; |
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407 | } |
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408 | |
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409 | return key; |
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410 | } |
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411 | |
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412 | |
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413 | public String addDurationKey(){ |
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414 | String req_key = getRequestKey(); |
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415 | |
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416 | Double duration_d; |
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417 | |
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418 | duration_d = (double)duration; |
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419 | duration_d = duration_d/1000.0; |
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420 | req_key += duration_d + "//-"; |
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421 | return req_key; |
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422 | } |
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423 | |
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424 | |
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425 | /** |
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426 | * This is the work-horse function. |
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427 | * It does two things: |
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428 | * 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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429 | * b) if format-parameter provided, invokes the transformation. |
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430 | * at the end the data to be returned as result is contained in the resultStream |
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431 | * If format is xml, then the data from sourceStream is passed further as resultStream. |
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432 | * |
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433 | * @throws Exception This is handled by struts (is mapped to some result in struts.xml based on the Exception-Class) |
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434 | */ |
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435 | public String getTargetRequestParams(){ |
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436 | return ""; |
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437 | } |
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438 | |
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439 | public void setRequestProperties(URLConnection urlConnection){ |
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440 | |
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441 | } |
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442 | |
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443 | public void prepare() { |
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444 | |
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445 | try{ |
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446 | loadParams(); |
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447 | setTargetProxy(); |
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448 | getTargetProxy().checkParams(); |
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449 | |
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450 | String req_key = getRequestKey(); |
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451 | log.debug("request_key: " + req_key); |
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452 | log.debug("params.size: " + params.size()); |
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453 | log.debug(getActionkey() + ".targetURL: " + getTargetProxy().getTargetRequest() + " .format:" + getFullFormat()); |
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454 | |
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455 | // Caching |
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456 | String xcid; |
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457 | |
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458 | if (getCache().equals(Cache.SKIP)) { |
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459 | |
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460 | sourceStream = getSourceStream(); |
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461 | |
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462 | } else { |
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463 | if (getCache().equals(Cache.USE)) { |
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464 | sourceStream = Cache.getCache().getFromCache(req_key); |
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465 | } |
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466 | if (sourceStream == null) { // either not in cache or cache_flag=refresh |
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467 | //sourceStream = getTargetRequest().openStream(); |
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468 | long startMillis = System.currentTimeMillis(); |
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469 | sourceStream = getSourceStream(); |
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470 | duration = System.currentTimeMillis() - startMillis; |
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471 | req_key = addDurationKey(); |
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472 | |
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473 | long now = System.currentTimeMillis(); |
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474 | xcid = Cache.getCache().putInCache(req_key,sourceStream); |
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475 | //Admin.notifyUser("putting in cache: " + req_key); |
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476 | sourceStream = Cache.getCache().getFromCache(req_key); |
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477 | } /* else { |
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478 | Admin.notifyUser("reading from cache: " + req_key); |
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479 | } */ |
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480 | } |
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481 | |
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482 | // add diagnostics non fatal |
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483 | if (getDiagnostics().Exists()){ |
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484 | Document doc ; |
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485 | Node r_element; |
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486 | // fatal error |
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487 | //TODO getDiagnostics().Exists("fatal"); |
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488 | if (sourceStream == null){ |
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489 | //TODO rootelemname ??? |
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490 | doc = Helpers.createDocument("rootelemname"); |
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491 | r_element = doc.getFirstChild(); |
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492 | } else { |
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493 | doc = Helpers.getDocument(sourceStream); |
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494 | //TODO tagname by class |
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495 | r_element= doc.getElementsByTagName("searchRetrieveResponse").item(0); |
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496 | } |
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497 | |
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498 | Document ddoc = getDiagnostics().buildXMLDocument(); |
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499 | Node d_element= ddoc.getElementsByTagName("diagnostics").item(0); |
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500 | doc.adoptNode(d_element); |
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501 | r_element.appendChild(d_element); |
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502 | DOMSource source = new DOMSource(doc); |
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503 | StringWriter xmlAsWriter = new StringWriter(); |
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504 | StreamResult result = new StreamResult(xmlAsWriter); |
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505 | TransformerFactory.newInstance().newTransformer().transform(source, result); |
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506 | this.setSourceStream(new ByteArrayInputStream(xmlAsWriter.toString().getBytes("UTF-8"))); |
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507 | } |
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508 | |
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509 | log.debug("format: " + getFormat() ); |
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510 | if (getFormat().equals("xml")) { |
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511 | resultStream = sourceStream; |
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512 | }else { |
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513 | MDTransformer transformer = new MDTransformer(); |
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514 | // set URL as srcFile (for MDTransformer to pass to xsl-scripts) |
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515 | // TODO: WHY?? |
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516 | transformer.setSrcFile(getTargetProxy().getTargetRequest()); |
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517 | //transformer.setParams(createTransformerParams()); |
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518 | transformer.setParams(getParams()); |
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519 | // here the transformation is invoked |
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520 | resultStream = transformer.transformXML(sourceStream); |
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521 | } |
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522 | |
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523 | }catch (Exception e){ |
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524 | //TODO add exception to diagnostic ? |
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525 | return; |
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526 | } |
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527 | |
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528 | log.debug(getActionkey() + " success:" + (resultStream!=null)); |
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529 | } |
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530 | |
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531 | /** |
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532 | * default Action method that gets called by Struts. Everything interesting happens in prepare() |
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533 | */ |
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534 | public String execute() throws Exception { |
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535 | // HttpServletRequest request = ServletActionContext.getRequest(); |
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536 | //Admin.notifyUser("session-attrs:"); |
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537 | //Admin.notifyUser(getServletRequest().getRemoteUser() ); |
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538 | //Admin.notifyUser(String.valueOf(getSession())); |
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539 | |
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540 | long now = System.currentTimeMillis(); |
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541 | |
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542 | prepare(); |
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543 | long duration = (System.currentTimeMillis() - now); |
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544 | //duration |
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545 | |
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546 | if (resultStream == null) { |
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547 | if (getDiagnostics().Exists()){ |
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548 | Document doc ; |
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549 | Node r_element; |
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550 | // fatal error |
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551 | //TODO getDiagnostics().Exists("fatal"); |
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552 | doc = Helpers.createDocument("Error"); |
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553 | r_element = doc.getFirstChild(); |
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554 | |
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555 | Document ddoc = getDiagnostics().buildXMLDocument(); |
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556 | Node d_element= ddoc.getElementsByTagName("diagnostics").item(0); |
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557 | doc.adoptNode(d_element); |
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558 | r_element.appendChild(d_element); |
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559 | DOMSource source = new DOMSource(doc); |
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560 | StringWriter xmlAsWriter = new StringWriter(); |
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561 | StreamResult result = new StreamResult(xmlAsWriter); |
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562 | TransformerFactory.newInstance().newTransformer().transform(source, result); |
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563 | this.setResultStream(new ByteArrayInputStream(xmlAsWriter.toString().getBytes("UTF-8"))); |
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564 | |
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565 | } |
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566 | return ERROR; |
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567 | } else { |
---|
568 | return SUCCESS; |
---|
569 | } |
---|
570 | } |
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571 | |
---|
572 | |
---|
573 | } |
---|