Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DistanceInfoServiceImpl.java @ 219:7523faf567e5

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Implemented a service to fetch distance information of a river from the artifact server. flys-client/trunk@1662 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 11 Apr 2011 14:32:36 +0000
parents
children 924da6695800
rev   line source
219
7523faf567e5 Implemented a service to fetch distance information of a river from the artifact server.
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1 package de.intevation.flys.client.server;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import javax.xml.xpath.XPathConstants;
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7
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8 import org.w3c.dom.Document;
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9 import org.w3c.dom.Element;
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10 import org.w3c.dom.Node;
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11 import org.w3c.dom.NodeList;
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12
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13 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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14
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15 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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16 import de.intevation.artifacts.common.utils.XMLUtils;
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17
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18 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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19 import de.intevation.artifacts.httpclient.http.HttpClient;
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20 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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21
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22 import de.intevation.flys.client.shared.exceptions.ServerException;
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23 import de.intevation.flys.client.client.services.DistanceInfoService;
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24 import de.intevation.flys.client.shared.model.DistanceInfoObject;
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25 import de.intevation.flys.client.shared.model.DistanceInfoObjectImpl;
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26
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27
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28 /**
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 */
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31 public class DistanceInfoServiceImpl
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32 extends RemoteServiceServlet
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33 implements DistanceInfoService
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34 {
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35 public static final String ERROR_NO_DISTANCEINFO_FOUND =
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36 "error_no_distanceinfo_found";
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37
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38 public static final String XPATH_DISTANCES = "art:distances/art:distance";
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39
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40
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41 public DistanceInfoObject[] getDistanceInfo(String url, String river)
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42 throws ServerException
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43 {
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44 System.out.println("DistanceInfoServiceImpl.getDistanceInfo");
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45
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46 Document doc = XMLUtils.newDocument();
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47
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48 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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49 doc,
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50 ArtifactNamespaceContext.NAMESPACE_URI,
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51 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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52
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53 Element riverEl = ec.create("river");
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54
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55 riverEl.setTextContent(river);
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56
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57 doc.appendChild(riverEl);
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58
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59 HttpClient client = new HttpClientImpl(url);
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60
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61 try {
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62 Document result = client.callService(url, "distanceinfo", doc);
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63
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64 System.out.println("Extract distance info objects now.");
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65 DistanceInfoObject[] objects = extractDistanceInfoObjects(result);
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66
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67 if (objects != null && objects.length > 0) {
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68 return objects;
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69 }
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70 }
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71 catch (ConnectionException ce) {
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72 System.err.println(ce.getLocalizedMessage());
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73 }
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74
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75 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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76 }
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77
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78
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79 /**
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80 * Extracts all distance info objects from <i>result</i> document.
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81 *
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82 * @param result The document retrieved by the server.
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83 *
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84 * @return a list of DistanceInfoObjects.
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85 */
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86 protected DistanceInfoObject[] extractDistanceInfoObjects(Document result)
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87 throws ServerException
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88 {
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89 NodeList list = (NodeList) XMLUtils.xpath(
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90 result,
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91 XPATH_DISTANCES,
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92 XPathConstants.NODESET,
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93 ArtifactNamespaceContext.INSTANCE);
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94
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95 if (list == null || list.getLength() == 0) {
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96 System.err.println("No distance info found.");
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97
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98 throw new ServerException(ERROR_NO_DISTANCEINFO_FOUND);
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99 }
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100
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101 int num = list.getLength();
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102 System.out.println("Response contains " + num + " objects.");
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103
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104 List<DistanceInfoObject> objects =
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105 new ArrayList<DistanceInfoObject>(num);
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106
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107 for (int i = 0; i < num; i++) {
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108 DistanceInfoObject obj = buildDistanceInfoObject(list.item(i));
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109
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110 if (obj != null) {
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111 objects.add(obj);
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112 }
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113 }
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114
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115 System.out.println("Retrieved " + objects.size() + " distances.");
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116
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117 return (DistanceInfoObject[])
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118 objects.toArray(new DistanceInfoObject[num]);
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119 }
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120
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121
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122 /**
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123 * Extracts information for a single distance info object and intializes an
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124 * DistanceInfoObject with them.
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125 *
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126 * @param node The node that contains the information.
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127 *
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128 * @return a valid DistanceInfoObject.
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129 */
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130 protected DistanceInfoObject buildDistanceInfoObject(Node node) {
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131 String desc = XMLUtils.xpathString(
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132 node, "@art:description", ArtifactNamespaceContext.INSTANCE);
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133
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134 String from = XMLUtils.xpathString(
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135 node, "@art:from", ArtifactNamespaceContext.INSTANCE);
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136
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137 String to = XMLUtils.xpathString(
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138 node, "@art:to", ArtifactNamespaceContext.INSTANCE);
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139
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140 String riverside = XMLUtils.xpathString(
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141 node, "@art:riverside", ArtifactNamespaceContext.INSTANCE);
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142
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143 if (desc != null && from != null) {
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144 try {
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145 return new DistanceInfoObjectImpl(
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146 desc,
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147 new Double(from),
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148 to != null && to.trim().length() > 0 ? new Double(to) : null,
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149 riverside);
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150 }
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151 catch (NumberFormatException nfe) {
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152 System.err.println(nfe.getLocalizedMessage());
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153 }
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154 }
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155
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156 System.err.println("Invalid distance info object found.");
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157
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158 return null;
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159 }
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160 }
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161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org