Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/StepForwardServiceImpl.java @ 1405:442ce7d6bc39
Removed needless imports.
flys-client/trunk@3290 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 18 Nov 2011 13:47:07 +0000 |
parents | ab8eb2f544f2 |
children | bc06a671ef60 |
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1 package de.intevation.flys.client.server; |
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2 |
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3 import org.w3c.dom.Document; |
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4 |
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5 import org.apache.log4j.Logger; |
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6 |
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7 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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8 import de.intevation.artifacts.common.utils.ClientProtocolUtils; |
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9 import de.intevation.artifacts.common.utils.XMLUtils; |
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10 |
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11 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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12 import de.intevation.artifacts.httpclient.http.HttpClient; |
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13 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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14 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler; |
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15 |
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16 import de.intevation.flys.client.shared.exceptions.ServerException; |
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17 import de.intevation.flys.client.shared.model.Artifact; |
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18 import de.intevation.flys.client.shared.model.ArtifactDescription; |
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19 import de.intevation.flys.client.shared.model.Data; |
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20 import de.intevation.flys.client.shared.model.DataItem; |
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21 import de.intevation.flys.client.client.services.StepForwardService; |
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22 |
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23 |
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24 /** |
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25 * This interface provides a method that bundles the artifact specific |
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26 * operations FEED and ADVANCE. |
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27 * |
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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29 */ |
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30 public class StepForwardServiceImpl |
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31 extends AdvanceServiceImpl |
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32 implements StepForwardService |
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33 { |
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34 private static final Logger logger = |
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35 Logger.getLogger(StepForwardServiceImpl.class); |
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36 |
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37 |
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38 /** XPath that points to the result type of a feed or advance operation.*/ |
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39 public static final String XPATH_RESULT = "/art:result/@art:type"; |
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40 |
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41 /** XPath that points to the result type of a feed or advance operation.*/ |
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42 public static final String XPATH_RESULT_MSG = "/art:result/text()"; |
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43 |
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44 /** A constant that marks errors.*/ |
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45 public static final String OPERATION_FAILURE = "FAILURE"; |
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46 |
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47 /** The error message key that is thrown if an error occured while feeding |
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48 * new data.*/ |
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49 public static final String ERROR_FEED_DATA = "error_feed_data"; |
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50 |
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51 |
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52 /** |
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53 * This method wraps the artifact operations FEED and ADVANCE. FEED is |
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54 * always triggerd, ADVANCE only, if there is at least one reachable state. |
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55 * |
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56 * @param url The url of the artifact server. |
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57 * @param locale The locale used for the request. |
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58 * @param artifact The artifact that needs to be fed. |
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59 * @param data An array of Data objects that contain the information that |
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60 * |
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61 * @return the modified artifact. |
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62 */ |
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63 public Artifact go(String url, String locale, Artifact artifact, Data[] data) |
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64 throws ServerException |
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65 { |
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66 logger.info("StepForwardServiceImpl.go"); |
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67 |
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68 Artifact afterFeed = feed(url, locale, artifact, data); |
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69 |
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70 if (afterFeed == null) { |
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71 logger.warn("StepForwardService.feed() - FAILED"); |
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72 throw new ServerException(ERROR_FEED_DATA); |
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73 } |
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74 |
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75 ArtifactDescription desc = afterFeed.getArtifactDescription(); |
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76 String[] reachable = desc.getReachableStates(); |
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77 |
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78 if (reachable == null || reachable.length == 0) { |
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79 logger.debug("Did not find any reachable state."); |
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80 return afterFeed; |
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81 } |
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82 |
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83 // We use the first reachable state as default target, maybe we need to |
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84 // change this later. |
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85 return advance(url, locale, afterFeed, reachable[0]); |
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86 } |
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87 |
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88 |
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89 /** |
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90 * This method triggers the FEED operation. |
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91 * |
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92 * @param url The url of the artifact server. |
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93 * @param artifact The artifact that needs to be fed. |
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94 * @param data An array of Data objects that contain the information that |
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95 * are used for the FEED operation. |
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96 * |
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97 * @return a new artifact parsed from the description of FEED. |
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98 */ |
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99 protected Artifact feed( |
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100 String url, |
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101 String locale, |
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102 Artifact artifact, |
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103 Data[] data) |
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104 throws ServerException |
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105 { |
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106 logger.info("StepForwardServiceImpl.feed"); |
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107 |
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108 Document feed = ClientProtocolUtils.newFeedDocument( |
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109 artifact.getUuid(), |
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110 artifact.getHash(), |
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111 createKVP(data)); |
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112 |
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113 HttpClient client = new HttpClientImpl(url, locale); |
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114 |
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115 try { |
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116 Document description = (Document) client.feed( |
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117 new de.intevation.artifacts.httpclient.objects.Artifact( |
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118 artifact.getUuid(), |
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119 artifact.getHash()), |
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120 feed, |
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121 new DocumentResponseHandler()); |
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122 |
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123 if (description == null) { |
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124 logger.warn("StepForwardService.feed() - FAILED"); |
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125 throw new ServerException(ERROR_FEED_DATA); |
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126 } |
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127 |
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128 String result = XMLUtils.xpathString( |
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129 description, |
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130 XPATH_RESULT, |
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131 ArtifactNamespaceContext.INSTANCE); |
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132 |
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133 if (result == null || !result.equals(OPERATION_FAILURE)) { |
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134 logger.debug("StepForwardService.feed() - SUCCESS"); |
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135 return (Artifact) new FLYSArtifactCreator().create(description); |
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136 } |
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137 else if (result != null && result.equals(OPERATION_FAILURE)) { |
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138 String msg = XMLUtils.xpathString( |
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139 description, |
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140 XPATH_RESULT_MSG, |
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141 ArtifactNamespaceContext.INSTANCE); |
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142 throw new ServerException(msg); |
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143 } |
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144 } |
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145 catch (ConnectionException ce) { |
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146 logger.error(ce, ce); |
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147 } |
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148 |
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149 logger.warn("StepForwardService.feed() - FAILED"); |
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150 throw new ServerException(ERROR_FEED_DATA); |
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151 } |
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152 |
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153 |
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154 /** |
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155 * This method creates an array of key/value pairs from an array of Data |
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156 * objects. The string array is used as parameter for the feed() operation. |
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157 * |
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158 * @param data The data that should be transformed into the string array. |
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159 * |
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160 * @return a string array that contains key/value pairs. |
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161 */ |
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162 protected String[][] createKVP(Data[] data) { |
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163 String[][] kvp = new String[data.length][]; |
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164 |
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165 int i = 0; |
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166 |
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167 for (Data d: data) { |
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168 DataItem[] items = d.getItems(); |
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169 String key = d.getLabel(); |
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170 String value = items[0].getStringValue(); |
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171 |
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172 kvp[i++] = new String[] { key, value }; |
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173 } |
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174 |
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175 return kvp; |
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176 } |
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177 } |
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178 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |