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.MalformedURLException; |
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6 | import java.net.URL; |
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7 | |
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8 | import javax.servlet.http.HttpServletRequest; |
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9 | import org.apache.struts2.interceptor.ServletRequestAware; |
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10 | |
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11 | import com.opensymphony.xwork2.ActionSupport; |
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12 | |
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13 | /** |
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14 | * main Struts 2 controller |
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15 | * responds to requests (collections, model, recordset) |
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16 | * by dispatching the requests to appropriate internal methods and filling the inputStream with the result |
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17 | * |
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18 | * @author vronk |
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19 | * |
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20 | */ |
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21 | public class GenericProxyAction extends ActionSupport |
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22 | implements ServletRequestAware |
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23 | { |
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24 | |
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25 | private static final long serialVersionUID = 1L; |
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26 | |
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27 | /** |
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28 | * Properties to be filled by Struts with according request-parameters |
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29 | */ |
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30 | private String actionkey; |
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31 | private String q; |
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32 | private String cache = Cache.USE; |
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33 | private String collection; |
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34 | private String columns; |
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35 | private int maxdepth; |
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36 | private String format; |
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37 | private String userMsg; |
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38 | //private Map<String,Object> session; |
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39 | private HttpServletRequest request; |
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40 | |
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41 | public String getQ() { |
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42 | return q; |
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43 | } |
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44 | |
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45 | public void setQ(String q) { |
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46 | this.q = q; |
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47 | } |
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48 | |
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49 | public String getCache() { |
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50 | return cache; |
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51 | } |
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52 | |
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53 | public void setCache(String cache) { |
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54 | this.cache = cache; |
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55 | } |
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56 | |
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57 | public String getCollection() { |
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58 | return collection; |
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59 | } |
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60 | |
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61 | public void setCollection(String collection) { |
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62 | this.collection = collection; |
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63 | } |
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64 | |
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65 | //TODO defaults |
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66 | public String getColumns() { |
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67 | String cols = columns; |
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68 | /*if (columns == null){ |
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69 | cols = "Id,Name,Title"; |
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70 | } |
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71 | */ |
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72 | return cols; |
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73 | } |
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74 | |
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75 | public void setColumns(String columns) { |
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76 | this.columns = columns; |
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77 | } |
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78 | |
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79 | public int getMaxdepth() { |
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80 | return maxdepth; |
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81 | } |
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82 | |
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83 | public void setMaxdepth(int maxdepth) { |
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84 | this.maxdepth = maxdepth; |
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85 | } |
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86 | |
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87 | public String getFormat() { |
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88 | return format; |
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89 | } |
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90 | |
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91 | public void setFormat(String format) { |
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92 | this.format = format; |
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93 | } |
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94 | |
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95 | public String getActionkey() { |
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96 | return actionkey; |
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97 | } |
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98 | |
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99 | public void setActionkey(String actionKey) { |
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100 | actionkey = actionKey; |
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101 | } |
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102 | |
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103 | public String getFullFormat() { |
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104 | return actionkey + "2" + format; |
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105 | } |
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106 | |
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107 | /** |
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108 | * primitive identification of the target-proxy |
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109 | * base for finding the right base_url in the props |
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110 | * subclass has to override with its specific proxykey |
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111 | * @return |
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112 | */ |
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113 | public String getProxyKey() { |
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114 | return ""; |
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115 | } |
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116 | |
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117 | public String getUserMsg() { |
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118 | return userMsg; |
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119 | } |
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120 | |
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121 | public void setUserMsg(String userMsg) { |
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122 | this.userMsg = this.userMsg + "\n" + userMsg; |
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123 | } |
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124 | |
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125 | @Override |
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126 | public void setServletRequest(HttpServletRequest arg0) { |
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127 | request = arg0; |
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128 | } |
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129 | |
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130 | public HttpServletRequest getServletRequest() { |
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131 | return request; |
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132 | } |
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133 | |
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134 | |
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135 | private InputStream resultStream; |
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136 | private InputStream sourceStream; |
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137 | |
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138 | /** |
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139 | * The stream holding the resulting data to be sent back to the user as response |
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140 | * @return |
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141 | */ |
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142 | public InputStream getResultStream() { |
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143 | return resultStream; |
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144 | } |
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145 | public void setResultStream(InputStream _resultStream){ |
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146 | resultStream = _resultStream; |
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147 | } |
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148 | public void setSourceStream(InputStream _sourceStream){ |
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149 | sourceStream = _sourceStream; |
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150 | } |
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151 | |
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152 | /* |
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153 | public InputStream getSourceStream() throws IOException { |
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154 | return getTargetRequest().openStream(); |
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155 | } |
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156 | */ |
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157 | |
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158 | private URL base_url ; |
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159 | |
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160 | public URL getBaseURL() throws MalformedURLException { |
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161 | if (base_url == null) { |
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162 | base_url = new URL(Admin.getConfig().getProperty(getProxyKey() + ".uri")); |
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163 | } |
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164 | return base_url; |
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165 | } |
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166 | |
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167 | |
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168 | public URL getTargetRequest() throws IOException { |
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169 | // URL targetURL =new URL( base_url, compname + ".xml"); |
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170 | URL targetURL = getBaseURL(); |
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171 | |
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172 | return targetURL; |
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173 | } |
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174 | |
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175 | public String getRequestKey() { |
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176 | String key=""; |
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177 | if (getActionkey()!=null) { |
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178 | key += getActionkey() + "//-" ; |
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179 | } |
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180 | if (getQ()!=null) { |
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181 | key += getQ() + "//-" ; |
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182 | } |
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183 | if (getCollection()!=null) { |
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184 | key += getCollection(); |
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185 | } |
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186 | |
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187 | return key; |
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188 | } |
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189 | |
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190 | public InputStream getSourceStream() throws IOException { |
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191 | return getTargetRequest().openStream(); |
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192 | // Admin.notifyUser(getProxyKey() + ".getSourceStream() - unable to open stream: " + getTargetRequest(); |
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193 | } |
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194 | |
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195 | |
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196 | public void prepare() throws Exception { |
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197 | |
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198 | Admin.notifyUser(getProxyKey() + ".targetURL: " + getTargetRequest() + " .format:" + getFullFormat()); |
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199 | |
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200 | // Caching |
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201 | String xcid; |
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202 | Admin.notifyUser("GPA.prepareSourceStream"); |
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203 | if (getCache().equals(Cache.SKIP)) { |
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204 | |
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205 | sourceStream = getSourceStream(); |
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206 | |
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207 | } else { |
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208 | if (getCache().equals(Cache.USE)) { |
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209 | sourceStream = Cache.getCache().getFromCache(getRequestKey()); |
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210 | } |
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211 | |
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212 | if (sourceStream == null) { // either not in cache or cache_flag=refresh |
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213 | //sourceStream = getTargetRequest().openStream(); |
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214 | sourceStream = getSourceStream(); |
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215 | xcid = Cache.getCache().putInCache(getRequestKey(),sourceStream); |
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216 | Admin.notifyUser("putting in cache: " + getRequestKey()); |
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217 | sourceStream = Cache.getCache().getFromCache(getRequestKey()); |
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218 | } else { |
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219 | Admin.notifyUser("reading from cache: " + getRequestKey()); |
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220 | } |
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221 | } |
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222 | |
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223 | if (format.equals("xml")) { |
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224 | resultStream = sourceStream; |
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225 | }else { |
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226 | // set URL as srcFile (for MDTransformer to pass to xsl-scripts) |
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227 | MDTransformer.getMDTransformer().setSrcFile(getTargetRequest()); |
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228 | // getColumns |
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229 | resultStream = MDTransformer.getMDTransformer().transformXML(sourceStream, getFullFormat(), getColumns()); |
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230 | } |
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231 | |
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232 | Admin.notifyUser(getProxyKey() + " success:" + (resultStream!=null)); |
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233 | } |
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234 | |
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235 | /** |
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236 | * default Action method |
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237 | */ |
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238 | public String execute() throws Exception { |
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239 | // HttpServletRequest request = ServletActionContext.getRequest(); |
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240 | |
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241 | |
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242 | Admin.notifyUser("session-attrs:"); |
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243 | Admin.notifyUser(getServletRequest().getRemoteUser() ); |
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244 | //Admin.notifyUser(String.valueOf(getSession())); |
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245 | |
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246 | prepare(); |
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247 | if (resultStream == null) { |
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248 | return ERROR; |
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249 | } else { |
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250 | return SUCCESS; |
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251 | } |
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252 | } |
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253 | |
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254 | |
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255 | } |
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