Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/StepForwardServiceImpl.java @ 221:f03c34bec364
Added a new service to query an artifact description.
flys-client/trunk@1666 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 12 Apr 2011 07:56:33 +0000 |
parents | e02f50a3ad59 |
children | 924da6695800 |
rev | line source |
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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 de.intevation.artifacts.common.ArtifactNamespaceContext; |
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6 import de.intevation.artifacts.common.utils.ClientProtocolUtils; |
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7 import de.intevation.artifacts.common.utils.XMLUtils; |
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8 |
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9 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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10 import de.intevation.artifacts.httpclient.http.HttpClient; |
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11 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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12 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler; |
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13 |
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14 import de.intevation.flys.client.shared.exceptions.ServerException; |
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15 import de.intevation.flys.client.shared.model.Artifact; |
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16 import de.intevation.flys.client.shared.model.ArtifactDescription; |
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17 import de.intevation.flys.client.shared.model.Data; |
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18 import de.intevation.flys.client.shared.model.DataItem; |
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19 import de.intevation.flys.client.client.services.StepForwardService; |
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20 |
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21 |
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22 /** |
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23 * This interface provides a method that bundles the artifact specific |
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24 * operations FEED and ADVANCE. |
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25 * |
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26 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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27 */ |
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28 public class StepForwardServiceImpl |
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29 extends AdvanceServiceImpl |
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30 implements StepForwardService |
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31 { |
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32 /** XPath that points to the result type of a feed or advance operation.*/ |
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33 public static final String XPATH_RESULT = "/art:result/@art:type"; |
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34 |
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35 /** A constant that marks errors.*/ |
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36 public static final String OPERATION_FAILURE = "FAILURE"; |
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37 |
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38 /** The error message key that is thrown if an error occured while feeding |
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39 * new data.*/ |
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40 public static final String ERROR_FEED_DATA = "error_feed_data"; |
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41 |
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42 |
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43 /** |
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44 * This method wraps the artifact operations FEED and ADVANCE. FEED is |
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45 * always triggerd, ADVANCE only, if there is at least one reachable state. |
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46 * |
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47 * @param serverUrl The url of the artifact server. |
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48 * @param artifact The artifact that needs to be fed. |
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49 * @param data An array of Data objects that contain the information that |
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50 * |
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51 * @return the modified artifact. |
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52 */ |
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53 public Artifact go(String serverUrl, Artifact artifact, Data[] data) |
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54 throws ServerException |
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55 { |
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56 Artifact afterFeed = feed(serverUrl, artifact, data); |
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57 |
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58 if (afterFeed == null) { |
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59 System.err.println("StepForwardService.feed() - FAILED"); |
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60 throw new ServerException(ERROR_FEED_DATA); |
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61 } |
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62 |
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63 ArtifactDescription desc = afterFeed.getArtifactDescription(); |
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64 String[] reachable = desc.getReachableStates(); |
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65 |
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66 if (reachable == null || reachable.length == 0) { |
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67 System.out.println("Did not find any reachable state."); |
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68 return afterFeed; |
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69 } |
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70 |
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71 // We use the first reachable state as default target, maybe we need to |
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72 // change this later. |
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73 return advance(serverUrl, afterFeed, reachable[0]); |
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74 } |
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75 |
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76 |
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77 /** |
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78 * This method triggers the FEED operation. |
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79 * |
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80 * @param serverUrl The url of the artifact server. |
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81 * @param artifact The artifact that needs to be fed. |
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82 * @param data An array of Data objects that contain the information that |
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83 * are used for the FEED operation. |
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84 * |
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85 * @return a new artifact parsed from the description of FEED. |
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86 */ |
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87 protected Artifact feed(String serverUrl, Artifact artifact, Data[] data) |
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88 throws ServerException |
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89 { |
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90 Document feed = ClientProtocolUtils.newFeedDocument( |
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91 artifact.getUuid(), |
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92 artifact.getHash(), |
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93 createKVP(data)); |
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94 |
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95 HttpClient client = new HttpClientImpl(serverUrl); |
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96 |
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97 try { |
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98 Document description = (Document) client.feed( |
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99 new de.intevation.artifacts.httpclient.objects.Artifact( |
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100 artifact.getUuid(), |
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101 artifact.getHash()), |
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102 feed, |
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103 new DocumentResponseHandler()); |
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104 |
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105 if (description == null) { |
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106 System.err.println("StepForwardService.feed() - FAILED"); |
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107 throw new ServerException(ERROR_FEED_DATA); |
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108 } |
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109 |
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110 String result = XMLUtils.xpathString( |
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111 description, |
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112 XPATH_RESULT, |
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113 ArtifactNamespaceContext.INSTANCE); |
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114 |
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115 if (result == null || !result.equals(OPERATION_FAILURE)) { |
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116 System.out.println("StepForwardService.feed() - SUCCESS"); |
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117 return (Artifact) new FLYSArtifactCreator().create(description); |
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118 } |
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119 else if (result != null && result.equals(OPERATION_FAILURE)) { |
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120 throw new ServerException(ERROR_FEED_DATA); |
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121 } |
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122 } |
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123 catch (ConnectionException ce) { |
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124 System.err.println(ce.getLocalizedMessage()); |
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125 } |
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126 |
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127 System.err.println("StepForwardService.feed() - FAILED"); |
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128 throw new ServerException(ERROR_FEED_DATA); |
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129 } |
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130 |
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131 |
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132 /** |
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133 * This method creates an array of key/value pairs from an array of Data |
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134 * objects. The string array is used as parameter for the feed() operation. |
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135 * |
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136 * @param data The data that should be transformed into the string array. |
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137 * |
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138 * @return a string array that contains key/value pairs. |
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139 */ |
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140 protected String[][] createKVP(Data[] data) { |
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141 String[][] kvp = new String[data.length][]; |
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142 |
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143 int i = 0; |
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144 |
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145 for (Data d: data) { |
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146 DataItem[] items = d.getItems(); |
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147 String key = d.getLabel(); |
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148 String value = items[0].getStringValue(); |
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149 |
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150 kvp[i++] = new String[] { key, value }; |
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151 } |
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152 |
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153 return kvp; |
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154 } |
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155 } |
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156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |