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.net.URLConnection; |
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6 | import java.util.HashMap; |
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7 | import java.util.Map; |
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8 | |
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9 | import javax.servlet.http.HttpServletRequest; |
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10 | import org.apache.log4j.Logger; |
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11 | import org.apache.struts2.interceptor.ServletRequestAware; |
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12 | import org.w3c.dom.Document; |
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13 | |
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14 | import com.opensymphony.xwork2.ActionSupport; |
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15 | |
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16 | import eu.clarin.cmdi.mdservice.internal.CQLParseException; |
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17 | import eu.clarin.cmdi.mdservice.internal.Cache; |
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18 | import eu.clarin.cmdi.mdservice.internal.MDTransformer; |
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19 | import eu.clarin.cmdi.mdservice.internal.NoStylesheetException; |
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20 | import eu.clarin.cmdi.mdservice.internal.Utils; |
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21 | import eu.clarin.cmdi.mdservice.model.Diagnostic; |
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22 | import eu.clarin.cmdi.mdservice.model.Diagnostics; |
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23 | import eu.clarin.cmdi.mdservice.model.WorkspaceProfile; |
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24 | import eu.clarin.cmdi.mdservice.proxy.ProxyInterface; |
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25 | |
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26 | |
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27 | |
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28 | /** |
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29 | * Main Struts2 controller (ie implemenets the struts' execute()-method), all other Actions are derived from. |
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30 | * Defines the methods used for retrieving the data |
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31 | * and provides basic implementation where possible. |
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32 | * Also responsible for caching and transformation of the result. |
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33 | * |
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34 | * @author vronk |
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35 | */ |
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36 | public class GenericAction extends ActionSupport |
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37 | implements ServletRequestAware |
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38 | { |
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39 | |
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40 | public static Logger log = Logger.getLogger("GenericAction"); |
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41 | private static final long serialVersionUID = 1L; |
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42 | |
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43 | private Diagnostics diagnostics; |
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44 | |
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45 | private String actionkey = "generic"; |
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46 | private String q; |
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47 | private String format = "xml"; |
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48 | |
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49 | private String actionContentType; |
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50 | private HttpServletRequest request; |
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51 | private long duration = 0; |
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52 | private InputStream resultStream; |
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53 | private InputStream sourceStream; |
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54 | |
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55 | private Map<String,String[]> params; |
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56 | |
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57 | private ProxyInterface target_proxy; |
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58 | |
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59 | /** |
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60 | * Gets the target proxy. |
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61 | * |
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62 | * @return target proxy |
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63 | */ |
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64 | public ProxyInterface getTargetProxy() { |
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65 | return target_proxy; |
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66 | } |
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67 | |
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68 | /** |
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69 | * Sets the particular proxy and its source action. |
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70 | * |
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71 | * @param proxy - interface to be set |
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72 | */ |
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73 | public void setTargetProxy(ProxyInterface proxy) { |
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74 | target_proxy = proxy; |
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75 | target_proxy.setSourceAction(this); |
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76 | } |
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77 | |
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78 | /** |
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79 | * Empty implementation, subclasses have to decide themselves, which proxy to take. |
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80 | */ |
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81 | public void setTargetProxy() { |
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82 | } |
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83 | |
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84 | |
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85 | /** |
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86 | * Gets the diagnostics. |
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87 | * |
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88 | * @return diagnostics |
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89 | */ |
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90 | public Diagnostics getDiagnostics(){ |
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91 | if (diagnostics == null){ |
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92 | diagnostics = new Diagnostics(); |
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93 | } |
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94 | return this.diagnostics; |
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95 | } |
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96 | |
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97 | /** |
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98 | * Sets the diagnostics. |
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99 | * |
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100 | * @param diagnostics |
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101 | */ |
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102 | public void setDiagnostics(Diagnostics diagnostics){ |
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103 | this.diagnostics = diagnostics; |
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104 | } |
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105 | |
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106 | /** |
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107 | * Gets string variable q. |
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108 | * |
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109 | * @return |
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110 | */ |
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111 | public String getQ() { |
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112 | return q; |
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113 | } |
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114 | |
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115 | /** |
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116 | * Sets the variable q. |
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117 | * |
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118 | * @param q |
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119 | */ |
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120 | public void setQ(String q) { |
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121 | this.q = q; |
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122 | } |
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123 | |
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124 | /** |
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125 | * Sets the variable format. Used by Struts in case the format is part of the request path. |
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126 | * In the case the format is part of the request parameters, it is read by servlet request. |
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127 | * |
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128 | * @param format |
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129 | */ |
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130 | public void setFormat(String format) { |
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131 | this.format = format; |
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132 | } |
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133 | |
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134 | |
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135 | public String getActionkey() { |
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136 | return actionkey; |
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137 | } |
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138 | |
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139 | public void setActionkey(String actionKey) { |
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140 | actionkey = actionKey; |
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141 | } |
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142 | |
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143 | /** |
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144 | * Gets the scanClause parameter from the parameter map. |
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145 | * |
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146 | * @return |
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147 | */ |
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148 | public String getScanClause() { |
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149 | return getParam("scanClause"); |
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150 | } |
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151 | |
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152 | /** |
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153 | * Gets the recordPacking parameter from the parameter map. |
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154 | * |
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155 | * @return |
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156 | */ |
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157 | public String getRecordPacking() { |
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158 | return getParam("recordPacking"); |
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159 | } |
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160 | |
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161 | public String getQuery() { |
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162 | return getParam("query"); |
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163 | } |
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164 | |
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165 | public String getStartRecord() { |
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166 | return getParam("startRecord"); |
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167 | } |
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168 | |
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169 | public String getMaximumRecords() { |
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170 | return getParam("maximumRecords"); |
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171 | } |
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172 | |
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173 | public String getFormat() { |
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174 | return getParam("format"); |
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175 | } |
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176 | |
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177 | public String getCache() { |
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178 | return getParam("cache"); |
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179 | } |
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180 | |
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181 | public String getRepository() { |
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182 | return getParam("repository"); |
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183 | } |
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184 | |
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185 | public String getLang() { |
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186 | return getParam("lang"); |
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187 | } |
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188 | |
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189 | public String getCollections() { |
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190 | return getParam("collections"); |
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191 | } |
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192 | |
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193 | public String getColumns() { |
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194 | return getParam("columns"); |
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195 | } |
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196 | |
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197 | public String getMaxdepth() { |
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198 | return getParam("maxdepth"); |
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199 | } |
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200 | |
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201 | |
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202 | /** |
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203 | * Is used in struts.xml to dynamically set the mime-type of the result, depending on the format-parameter |
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204 | * |
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205 | * @return |
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206 | */ |
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207 | public String getActionContentType() { |
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208 | if (this.getFormat().toLowerCase().startsWith("html")) { // && !getDiagnostics().Exists()) { |
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209 | this.actionContentType = "text/html"; |
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210 | //this.actionContentType = "application/xhtml+xml"; |
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211 | } else { |
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212 | this.actionContentType = "text/xml"; |
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213 | } |
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214 | |
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215 | return actionContentType; |
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216 | } |
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217 | |
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218 | public void setActionContentType(String actionContentType) { |
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219 | this.actionContentType = actionContentType; |
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220 | } |
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221 | |
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222 | |
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223 | public String getFullFormat() { |
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224 | return actionkey + "2" + getFormat(); |
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225 | } |
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226 | |
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227 | /** |
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228 | * Needed to acquire the original ServletRequest |
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229 | * (want to access the raw params - in loadParams()) |
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230 | * @return |
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231 | */ |
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232 | @Override |
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233 | public void setServletRequest(HttpServletRequest arg0) { |
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234 | request = arg0; |
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235 | } |
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236 | |
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237 | public HttpServletRequest getServletRequest() { |
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238 | return request; |
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239 | } |
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240 | |
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241 | /** |
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242 | * The stream holding the resulting data to be sent back to the user as response. |
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243 | * @return |
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244 | */ |
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245 | public InputStream getResultStream() { |
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246 | return resultStream; |
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247 | } |
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248 | |
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249 | public void setResultStream(InputStream _resultStream){ |
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250 | resultStream = _resultStream; |
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251 | } |
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252 | |
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253 | public void setSourceStream(InputStream _sourceStream){ |
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254 | sourceStream = _sourceStream; |
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255 | } |
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256 | |
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257 | |
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258 | /** |
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259 | * Get the sourceStream from the target proxy. |
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260 | * @return |
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261 | * @throws IOException |
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262 | * @throws NoStylesheetException |
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263 | * @throws CQLParseException |
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264 | */ |
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265 | public InputStream getSourceStream() throws IOException, NoStylesheetException, CQLParseException { |
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266 | return getTargetProxy().getSourceStream(); |
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267 | } |
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268 | |
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269 | /** |
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270 | * Add parameter into local parameter map. |
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271 | * |
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272 | * @param key - parameter key |
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273 | * @param value - parameter value |
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274 | */ |
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275 | public void addParam(String key, String value){ |
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276 | String[] sarr = new String[1]; |
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277 | sarr[0] = value; |
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278 | params.put(key, sarr); |
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279 | } |
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280 | |
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281 | /** |
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282 | * Set parameter in local parameter map. |
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283 | * |
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284 | * @param key - parameter key |
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285 | * @param value - parameter value |
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286 | */ |
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287 | public void setParam(String key, String value){ |
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288 | addParam(key, value); |
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289 | } |
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290 | |
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291 | /** |
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292 | * Reads in all the parameters of the request into an internal structure. |
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293 | * the Map is not Map<String,String>, but rather Map<String,String[]>, |
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294 | * 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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295 | * |
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296 | * This shall allow more flexibility in using the parameters in the subclasses (and less getter/setter stuff) |
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297 | * at the cost of circumventing the Struts-way. |
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298 | * |
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299 | * |
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300 | * The params are completed to fulfill sru params standard an also the params needed by XSL transformation |
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301 | * are added. |
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302 | * |
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303 | * SRU PARAMS: |
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304 | * version |
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305 | * operation |
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306 | * query |
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307 | * scanClause |
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308 | * startRecord |
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309 | * maximumRecords |
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310 | * recordPacking |
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311 | * recordSchema |
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312 | * recordXPath |
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313 | * resultSetTTL |
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314 | * sortKeys |
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315 | * stylesheet |
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316 | * x-cmd-repository |
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317 | * x-cmd-collections |
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318 | * x-cmd-columns |
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319 | * x-cmd-lang |
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320 | * x-cmd-format |
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321 | * x-cmd-cache |
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322 | * x-cmd-maxdepth |
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323 | */ |
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324 | @SuppressWarnings("unchecked") |
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325 | protected void loadParams() { |
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326 | params = new HashMap(getServletRequest().getParameterMap()); |
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327 | |
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328 | // set defaults |
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329 | if ( params.get("version") == null){ |
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330 | addParam("version","1.2"); |
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331 | } |
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332 | if ( params.get("operation") == null){ |
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333 | addParam("operation","searchRetrieve"); |
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334 | } |
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335 | //q=query |
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336 | if (getQ() != null) { |
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337 | addParam("q",getQ()); |
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338 | addParam("query",getQ()); |
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339 | } else { |
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340 | addParam("q",this.getParam("query")); |
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341 | } |
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342 | |
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343 | if ( params.get("startRecord") == null){ |
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344 | addParam("startRecord","1"); |
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345 | } |
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346 | if ( params.get("maximumRecords") == null){ |
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347 | addParam("maximumRecords","50"); |
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348 | } |
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349 | |
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350 | if ( params.get("x-cmd-maxdepth") == null){ |
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351 | if (params.get("maxdepth") == null){ |
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352 | addParam("maxdepth","2"); |
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353 | } |
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354 | } else { |
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355 | addParam("maxdepth",params.get("x-cmd-maxdepth")[0]); |
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356 | } |
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357 | |
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358 | if ( params.get("x-cmd-repository") == null){ |
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359 | if (params.get("repository") == null){ |
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360 | addParam("repository",WorkspaceProfile.getRepositoryByIndex(0)); |
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361 | } |
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362 | } else { |
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363 | addParam("repository",params.get("x-cmd-repository")[0]); |
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364 | } |
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365 | |
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366 | if ( params.get("x-cmd-cache") == null){ |
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367 | if (params.get("cache") == null){ |
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368 | addParam("cache",Cache.SKIP); |
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369 | } |
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370 | } else { |
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371 | addParam("cache",params.get("x-cmd-cache")[0]); |
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372 | } |
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373 | |
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374 | if ( params.get("x-cmd-lang") == null){ |
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375 | if (params.get("lang") == null){ |
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376 | addParam("lang","en"); |
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377 | } |
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378 | } else { |
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379 | addParam("lang",params.get("x-cmd-lang")[0]); |
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380 | } |
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381 | |
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382 | if ( params.get("x-cmd-format") == null){ |
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383 | if (params.get("format") == null){ |
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384 | if (this.format == null) { |
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385 | addParam("format","xml"); |
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386 | } else if (this.format.equals("")){ |
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387 | addParam("format","xml"); |
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388 | } else { |
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389 | addParam("format",this.format); |
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390 | } |
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391 | } |
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392 | } else { |
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393 | addParam("format",params.get("x-cmd-format")[0]); |
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394 | } |
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395 | |
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396 | addParam("fullformat",getFullFormat()); |
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397 | |
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398 | } |
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399 | |
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400 | /** |
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401 | * Gets the local parameter map. |
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402 | * |
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403 | * @return |
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404 | */ |
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405 | public Map<String,String[]> getParams() { |
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406 | return params; |
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407 | } |
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408 | |
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409 | |
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410 | /** |
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411 | * This is for simplified access to the the values of the request-parameters |
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412 | * They are stored in the parameters-map as a String-array, |
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413 | * but in most(?) situations, we expect just a simple string. |
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414 | * @param key |
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415 | * @return |
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416 | */ |
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417 | public String getParam(String key) { |
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418 | String v = ""; |
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419 | if (!(params.get(key)==null)) v=(String)params.get(key)[0]; |
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420 | return v; |
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421 | } |
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422 | |
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423 | public String[] getParamArray(String key) { |
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424 | String[] a = null; |
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425 | if (!(params.get(key)==null)) a=(String[])params.get(key); |
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426 | return a; |
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427 | } |
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428 | |
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429 | /** |
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430 | * Constructs an unambiguous key for the request (encoding all the parameters). |
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431 | * This is used as identifier for caching . |
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432 | * |
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433 | * @return key unambiguously encoding the request |
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434 | */ |
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435 | |
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436 | public String getRequestKey() { |
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437 | String key=""; |
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438 | if (getActionkey()!=null) { |
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439 | key += getActionkey() + "//-" ; |
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440 | }else { |
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441 | key +="//-" ; |
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442 | } |
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443 | if (getQuery()!=null) { |
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444 | key += getQuery() + "//-" ; |
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445 | } else { |
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446 | key +="//-" ; |
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447 | } |
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448 | if (getCollections()!=null) { |
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449 | key += getCollections() + "//-"; |
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450 | } else { |
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451 | key +="//-" ; |
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452 | } |
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453 | if (this.getStartRecord()!=null) { |
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454 | key += getStartRecord() + "//-"; |
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455 | } |
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456 | else{ |
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457 | key +="//-" ; |
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458 | } |
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459 | if (getMaximumRecords()!=null) { |
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460 | key += getMaximumRecords() + "//-"; |
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461 | } |
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462 | else{ |
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463 | key +="//-" ; |
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464 | } |
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465 | |
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466 | key += getRepository() + "//-"; |
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467 | key += getMaxdepth() + "//-"; |
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468 | |
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469 | if (getLang()!=null) { |
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470 | key += getLang() + "//-"; |
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471 | }else{ |
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472 | key +="//-" ; |
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473 | } |
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474 | |
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475 | return key; |
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476 | } |
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477 | |
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478 | |
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479 | /** |
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480 | * Adds the duration value of the action execution to the request key. |
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481 | * |
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482 | * @return |
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483 | */ |
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484 | public String addDurationKey(){ |
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485 | String req_key = getRequestKey(); |
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486 | |
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487 | Double duration_d; |
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488 | |
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489 | duration_d = (double)duration; |
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490 | duration_d = duration_d/1000.0; |
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491 | req_key += duration_d + "//-"; |
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492 | return req_key; |
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493 | } |
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494 | |
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495 | |
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496 | public String getTargetRequestParams(){ |
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497 | return ""; |
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498 | } |
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499 | |
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500 | public void setRequestProperties(URLConnection urlConnection){ |
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501 | |
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502 | } |
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503 | |
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504 | /** |
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505 | * This is the work-horse function. |
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506 | * It does more things: |
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507 | * a) Loads the request parameters. |
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508 | * b) Creates the concerned proxy object. |
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509 | * c) Checks if the source data is already in cache (based on cache-key that is constructed from the request parameters). |
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510 | * d) If diagnostics occurred during function, the diagnostics data will be added into source data. |
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511 | * e) If format-parameter provided, invokes the transformation. |
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512 | * |
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513 | * |
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514 | * At the end the data to be returned as result is contained in the resultStream |
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515 | * If format is xml, then the data from sourceStream is passed further as resultStream. |
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516 | * |
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517 | * If exception occurred within prepare function , it will be caught and written |
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518 | * as diagnostics system error. |
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519 | * |
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520 | */ |
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521 | public void prepare() { |
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522 | |
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523 | try{ |
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524 | loadParams(); |
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525 | |
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526 | setTargetProxy(); |
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527 | if (getTargetProxy() == null) return; |
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528 | getTargetProxy().checkParams(); |
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529 | |
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530 | // Do not continue if something is fatal. |
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531 | if (getDiagnostics().Exists()) return; |
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532 | |
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533 | String req_key = getRequestKey(); |
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534 | log.debug("request_key: " + req_key); |
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535 | log.debug("params.size: " + params.size()); |
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536 | log.debug(getActionkey() + ".targetURL: " + getTargetProxy().getTargetRequest() + " .format:" + getFullFormat()); |
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537 | |
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538 | //Caching |
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539 | |
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540 | if (getCache().equals(Cache.SKIP)) { |
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541 | |
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542 | sourceStream = getSourceStream(); |
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543 | |
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544 | } else { |
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545 | if (getCache().equals(Cache.USE)) { |
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546 | sourceStream = Cache.getCache().getFromCache(req_key); |
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547 | } |
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548 | if (sourceStream == null) { // either not in cache or cache_flag=refresh |
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549 | long startMillis = System.currentTimeMillis(); |
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550 | sourceStream = getSourceStream(); |
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551 | duration = System.currentTimeMillis() - startMillis; |
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552 | req_key = addDurationKey(); |
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553 | String xcid = Cache.getCache().putInCache(req_key,sourceStream); |
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554 | log.debug("putting in cache: " + req_key + ", " + xcid); |
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555 | sourceStream = Cache.getCache().getFromCache(req_key); |
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556 | } else { |
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557 | log.debug("reading from cache: " + req_key); |
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558 | } |
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559 | } |
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560 | |
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561 | // append diagnostics to sourcestream |
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562 | if (getDiagnostics().Exists()){ |
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563 | if (sourceStream == null) return; |
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564 | |
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565 | Document doc = Utils.stream2Document(sourceStream); |
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566 | //TODO tagname by class |
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567 | doc = Utils.append2Document(doc, "searchRetrieveResponse", getDiagnostics().buildXMLDocument()); |
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568 | this.setSourceStream(Utils.document2Stream(doc)); |
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569 | } |
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570 | |
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571 | log.debug("format: " + getFormat() ); |
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572 | if (getFormat().equals("xml")) { |
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573 | resultStream = sourceStream; |
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574 | }else { |
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575 | MDTransformer transformer = new MDTransformer(); |
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576 | // set URL as srcFile (for MDTransformer to pass to xsl-scripts) |
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577 | // TODO: WHY?? |
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578 | transformer.setSrcFile(getTargetProxy().getTargetRequest()); |
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579 | transformer.setParams(getParams()); |
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580 | // here the transformation is invoked |
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581 | resultStream = transformer.transformXML(sourceStream); |
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582 | } |
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583 | |
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584 | }catch (Exception e){ |
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585 | log.error(Utils.errorMessage(e)); |
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586 | //TODO add exception to diagnostic ? |
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587 | getDiagnostics().Add(Diagnostic.SYSTEM_ERROR, Utils.errorMessage(e)); |
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588 | return; |
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589 | } |
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590 | |
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591 | log.debug(getActionkey() + " success:" + (resultStream!=null)); |
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592 | } |
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593 | |
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594 | /** |
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595 | * Default Action method that gets called by Struts. Everything interesting happens in prepare() |
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596 | * In case an error occurred in prepare and the result stream is not returned, the diagnostics will be returned |
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597 | * as result. |
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598 | * |
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599 | * @throws Exception This is handled by struts (is mapped to some result in struts.xml based on the Exception-Class). |
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600 | */ |
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601 | public String execute() throws Exception { |
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602 | |
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603 | prepare(); |
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604 | |
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605 | if (resultStream == null) { |
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606 | // diagnostics to resultstream |
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607 | if (getDiagnostics().Exists()){ |
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608 | this.setResultStream( Utils.document2Stream(getDiagnostics().buildXMLDocument())); |
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609 | return SUCCESS; |
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610 | } |
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611 | return ERROR; |
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612 | } else { |
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613 | return SUCCESS; |
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614 | } |
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615 | } |
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616 | |
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617 | |
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618 | } |
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