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annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 229:924da6695800

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Each service is now called with the name of the current locale to set the request object's locale manually in the HttpClient. flys-client/trunk@1681 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 14 Apr 2011 07:53:01 +0000
parents e02f50a3ad59
children d01b0d81b92a
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 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.Node;
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10 import org.w3c.dom.NodeList;
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11
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12 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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13
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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15 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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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 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler;
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22
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23 import de.intevation.flys.client.shared.exceptions.ServerException;
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24 import de.intevation.flys.client.shared.model.Collection;
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25 import de.intevation.flys.client.shared.model.CollectionItem;
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26 import de.intevation.flys.client.shared.model.DefaultCollection;
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27 import de.intevation.flys.client.shared.model.DefaultCollectionItem;
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28 import de.intevation.flys.client.shared.model.DefaultOutputMode;
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29 import de.intevation.flys.client.shared.model.OutputMode;
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30 import de.intevation.flys.client.client.services.DescribeCollectionService;
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31
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32
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33 /**
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34 * This service implements a method that queries the DESCRIBE document of a
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35 * specific collection and returns a Collection object with the information of
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36 * the document.
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37 *
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38 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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39 */
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40 public class DescribeCollectionServiceImpl
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41 extends RemoteServiceServlet
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42 implements DescribeCollectionService
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43 {
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44 /** The error message key that is thrown if an error occured while
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45 * describe() a Collection.*/
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46 public static final String ERROR_DESCRIBE_COLLECTION =
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47 "error_describe_collection";
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48
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49
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50 public Collection describe(String uuid, String serverUrl, String locale)
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51 throws ServerException
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52 {
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53 System.out.println("DescribeCollectionServiceImpl.describe");
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54
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55 Document describe = ClientProtocolUtils.newDescribeCollectionDocument(
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56 uuid);
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57
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58 HttpClient client = new HttpClientImpl(serverUrl, locale);
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59
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60 try {
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61 Document response = (Document) client.doCollectionAction(
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62 describe, uuid, new DocumentResponseHandler());
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63
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64 Collection c = parseCollection(response);
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65
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66 if (c == null) {
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67 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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68 }
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69
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70 return c;
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71 }
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72 catch (ConnectionException ce) {
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73 System.err.println(ce.getLocalizedMessage());
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74 }
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75
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76 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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77 }
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78
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79
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80 /**
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81 * This method takes the DESCRIBE document of the Collections describe()
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82 * operation and extracts the information about the collection itself and
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83 * the collection items.
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84 *
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85 * @param description The DESCRIBE document of the Collections describe()
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86 * operation.
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87 *
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88 * @return a Collection with CollectionItems.
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89 */
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90 protected Collection parseCollection(Document description) {
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91 System.out.println("AddArtifactServiceImpl.parseCollection");
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92
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93 if (description == null) {
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94 System.err.println("The DESCRIBE of the Collection is null!");
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95 return null;
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96 }
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97
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98 String uuid = XMLUtils.xpathString(
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99 description,
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100 "art:artifact-collection/@art:uuid",
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101 ArtifactNamespaceContext.INSTANCE);
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102
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103 if (uuid == null || uuid.equals("")) {
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104 System.err.println("Found an invalid Collection!");
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105 return null;
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106 }
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107
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108 Collection c = new DefaultCollection(uuid);
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109
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110 NodeList items = (NodeList) XMLUtils.xpath(
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111 description,
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112 "art:artifact-collection/art:artifacts/art:artifact",
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113 XPathConstants.NODESET,
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114 ArtifactNamespaceContext.INSTANCE);
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115
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116 if (items == null || items.getLength() == 0) {
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117 System.out.println("No collection item found for this collection.");
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118
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119 return c;
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120 }
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121
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122 int size = items.getLength();
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123
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124 for (int i = 0; i < size; i++) {
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125 CollectionItem item = parseCollectionItem(items.item(i));
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126
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127 if (item != null) {
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128 c.addItem(item);
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129 }
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130 }
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131
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132 System.out.println(
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133 "Found " + c.getItemLength() + " collection items " +
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134 "for the Collection '" + c.identifier() + "'.");
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135
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136 return c;
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137 }
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138
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139
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140 /**
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141 * This method extracts the CollectionItem from <i>node</i> with its output
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142 * modes. The output modes are parsed using the parseOutputModes() method.
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143 *
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144 * @param node A node that contains information about a CollectionItem.
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145 *
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146 * @return a CollectionItem.
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147 */
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148 protected CollectionItem parseCollectionItem(Node node) {
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149 System.out.println("AddArtifactServiceImpl.parseCollectionItem");
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150
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151 if (node == null) {
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152 System.err.println("The node for parsing CollectionItem is null!");
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153 return null;
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154 }
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155
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156 String uuid = XMLUtils.xpathString(
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157 node, "@art:uuid", ArtifactNamespaceContext.INSTANCE);
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158
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159 String hash = XMLUtils.xpathString(
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160 node, "@art:hash", ArtifactNamespaceContext.INSTANCE);
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161
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162 if (uuid == null || uuid.equals("")) {
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163 System.err.println("Found an invalid CollectionItem!");
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164 }
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165
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166 Node outputmodes = (Node) XMLUtils.xpath(
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167 node,
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168 "art:outputmodes",
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169 XPathConstants.NODE,
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170 ArtifactNamespaceContext.INSTANCE);
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171
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172 List<OutputMode> modes = parseOutputModes(outputmodes);
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173
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174 return new DefaultCollectionItem(uuid, hash, modes);
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175 }
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176
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177
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178 /**
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179 * This method extracts the OutputModes available for a specific
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180 * CollectionItem and returns them as list.
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181 *
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182 * @param node The root node of the outputmodes list.
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183 *
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184 * @return a list of OutputModes.
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185 */
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186 protected List<OutputMode> parseOutputModes(Node node) {
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187 System.out.println("AddArtifactServiceImpl.parseOutputModes");
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188
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189 if (node == null) {
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190 System.err.println("The node for parsing OutputModes is null!");
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191 return null;
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192 }
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193
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194 NodeList list = (NodeList) XMLUtils.xpath(
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195 node,
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196 "art:output",
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197 XPathConstants.NODESET,
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198 ArtifactNamespaceContext.INSTANCE);
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199
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200 if (list == null || list.getLength() == 0) {
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201 System.err.println("No outputmode nodes found!");
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202 return null;
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203 }
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204
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205 int size = list.getLength();
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206
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207 List<OutputMode> modes = new ArrayList<OutputMode>(size);
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208
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209 for (int i = 0; i < size; i++) {
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210 Node tmp = list.item(i);
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211 String name = XMLUtils.xpathString(
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212 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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213 String desc = XMLUtils.xpathString(
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214 tmp, "@art:description", ArtifactNamespaceContext.INSTANCE);
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215 String mime = XMLUtils.xpathString(
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216 tmp, "@art:mime-type", ArtifactNamespaceContext.INSTANCE);
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217
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218 if (name == null || name.equals("")) {
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219 System.err.println("Found an invalid output mode.");
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220
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221 continue;
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222 }
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223
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224 // TODO Parse Facets
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225
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226 modes.add(new DefaultOutputMode(name, desc, mime));
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227 }
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228
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229 return modes;
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230 }
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231 }
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232 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org