Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/FeedServiceImpl.java @ 851:aa83a6a864b4

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Added FeedService Implementation. flys-client/trunk@2636 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 02 Sep 2011 12:48:25 +0000
parents
children 3d379e6b9a5f
rev   line source
851
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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 com.google.gwt.user.server.rpc.RemoteServiceServlet;
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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.FeedService;
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22
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23 /**
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24 * This interface provides a method that bundles the artifact specific
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25 * operation FEED.
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26 */
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27 public class FeedServiceImpl
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28 extends RemoteServiceServlet
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29 implements FeedService
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30 {
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31 /** XPath that points to the result type of a feed or advance operation.*/
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32 public static final String XPATH_RESULT = "/art:result/@art:type";
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33
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34 /** XPath that points to the result type of a feed or advance operation.*/
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35 public static final String XPATH_RESULT_MSG = "/art:result/text()";
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36
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37 /** A constant that marks errors.*/
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38 public static final String OPERATION_FAILURE = "FAILURE";
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39
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40 /** The error message key that is thrown if an error occured while feeding
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41 * new data.*/
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42 public static final String ERROR_FEED_DATA = "error_feed_data";
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43
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44
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45 /**
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46 * This method triggers the FEED operation.
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47 *
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48 * @param url The url of the artifact server.
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49 * @param artifact The artifact that needs to be fed.
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50 * @param data An array of Data objects that contain the information that
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51 * are used for the FEED operation.
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52 *
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53 * @return a new artifact parsed from the description of FEED.
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54 */
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55 public Artifact feed(
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56 String url,
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57 String locale,
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58 Artifact artifact,
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59 Data[] data)
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60 throws ServerException
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61 {
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62 System.out.println("StepForwardServiceImpl.feed");
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63
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64 Document feed = ClientProtocolUtils.newFeedDocument(
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65 artifact.getUuid(),
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66 artifact.getHash(),
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67 createKVP(data));
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68
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69 HttpClient client = new HttpClientImpl(url, locale);
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70
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71 try {
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72 Document description = (Document) client.feed(
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73 new de.intevation.artifacts.httpclient.objects.Artifact(
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74 artifact.getUuid(),
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75 artifact.getHash()),
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76 feed,
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77 new DocumentResponseHandler());
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78
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79 if (description == null) {
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80 System.err.println("StepForwardService.feed() - FAILED");
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81 throw new ServerException(ERROR_FEED_DATA);
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82 }
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83
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84 String result = XMLUtils.xpathString(
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85 description,
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86 XPATH_RESULT,
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87 ArtifactNamespaceContext.INSTANCE);
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88
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89 if (result == null || !result.equals(OPERATION_FAILURE)) {
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90 System.out.println("StepForwardService.feed() - SUCCESS");
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91 return (Artifact) new FLYSArtifactCreator().create(description);
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92 }
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93 else if (result != null && result.equals(OPERATION_FAILURE)) {
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94 String msg = XMLUtils.xpathString(
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95 description,
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96 XPATH_RESULT_MSG,
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97 ArtifactNamespaceContext.INSTANCE);
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98 throw new ServerException(msg);
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99 }
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100 }
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101 catch (ConnectionException ce) {
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102 System.err.println(ce.getLocalizedMessage());
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103 }
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104
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105 System.err.println("StepForwardService.feed() - FAILED");
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106 throw new ServerException(ERROR_FEED_DATA);
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107 }
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108
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109
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110 /**
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111 * This method creates an array of key/value pairs from an array of Data
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112 * objects. The string array is used as parameter for the feed() operation.
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113 *
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114 * @param data The data that should be transformed into the string array.
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115 *
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116 * @return a string array that contains key/value pairs.
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117 */
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118 protected String[][] createKVP(Data[] data) {
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119 String[][] kvp = new String[data.length][];
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120
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121 int i = 0;
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122
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123 for (Data d: data) {
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124 DataItem[] items = d.getItems();
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125 String key = d.getLabel();
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126 String value = items[0].getStringValue();
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127
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128 kvp[i++] = new String[] { key, value };
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129 }
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130
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131 return kvp;
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132 }
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133 }
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134 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org