Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 99:5c3d685546a6
Added a new service to describe collections.
flys-client/trunk@1613 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 30 Mar 2011 07:35:59 +0000 |
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children | f7967d12ce6e |
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.model.Artifact; |
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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 public Collection describe(String uuid, String serverUrl) { |
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45 System.out.println("DescribeCollectionServiceImpl.describe"); |
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46 |
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47 Document describe = ClientProtocolUtils.newDescribeCollectionDocument( |
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48 uuid); |
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49 |
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50 HttpClient client = new HttpClientImpl(serverUrl); |
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51 |
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52 try { |
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53 Document response = (Document) client.doCollectionAction( |
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54 describe, uuid, new DocumentResponseHandler()); |
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55 |
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56 Collection c = parseCollection(response); |
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57 |
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58 if (c == null) { |
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59 throw new NullPointerException("No collection returned."); |
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60 } |
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61 |
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62 return c; |
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63 } |
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64 catch (ConnectionException ce) { |
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65 System.err.println(ce.getLocalizedMessage()); |
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66 } |
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67 |
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68 return null; |
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69 } |
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70 |
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71 |
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72 /** |
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73 * This method takes the DESCRIBE document of the Collections describe() |
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74 * operation and extracts the information about the collection itself and |
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75 * the collection items. |
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76 * |
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77 * @param description The DESCRIBE document of the Collections describe() |
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78 * operation. |
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79 * |
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80 * @return a Collection with CollectionItems. |
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81 */ |
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82 protected Collection parseCollection(Document description) { |
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83 System.out.println("AddArtifactServiceImpl.parseCollection"); |
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84 |
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85 if (description == null) { |
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86 System.err.println("The DESCRIBE of the Collection is null!"); |
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87 return null; |
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88 } |
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89 |
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90 String uuid = XMLUtils.xpathString( |
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91 description, |
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92 "art:artifact-collection/@art:uuid", |
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93 ArtifactNamespaceContext.INSTANCE); |
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94 |
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95 if (uuid == null || uuid.equals("")) { |
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96 System.err.println("Found an invalid Collection!"); |
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97 return null; |
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98 } |
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99 |
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100 Collection c = new DefaultCollection(uuid); |
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101 |
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102 NodeList items = (NodeList) XMLUtils.xpath( |
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103 description, |
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104 "art:artifact-collection/art:artifacts/art:artifact", |
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105 XPathConstants.NODESET, |
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106 ArtifactNamespaceContext.INSTANCE); |
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107 |
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108 if (items == null || items.getLength() == 0) { |
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109 System.out.println("No collection item found for this collection."); |
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110 |
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111 return c; |
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112 } |
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113 |
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114 int size = items.getLength(); |
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115 |
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116 for (int i = 0; i < size; i++) { |
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117 CollectionItem item = parseCollectionItem(items.item(i)); |
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118 |
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119 if (item != null) { |
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120 c.addItem(item); |
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121 } |
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122 } |
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123 |
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124 System.out.println( |
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125 "Found " + c.getItemLength() + " collection items " + |
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126 "for the Collection '" + c.identifier() + "'."); |
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127 |
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128 return c; |
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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 extracts the CollectionItem from <i>node</i> with its output |
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134 * modes. The output modes are parsed using the parseOutputModes() method. |
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135 * |
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136 * @param node A node that contains information about a CollectionItem. |
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137 * |
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138 * @return a CollectionItem. |
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139 */ |
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140 protected CollectionItem parseCollectionItem(Node node) { |
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141 System.out.println("AddArtifactServiceImpl.parseCollectionItem"); |
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142 |
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143 if (node == null) { |
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144 System.err.println("The node for parsing CollectionItem is null!"); |
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145 return null; |
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146 } |
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147 |
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148 String uuid = XMLUtils.xpathString( |
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149 node, "@art:uuid", ArtifactNamespaceContext.INSTANCE); |
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150 |
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151 String hash = XMLUtils.xpathString( |
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152 node, "@art:hash", ArtifactNamespaceContext.INSTANCE); |
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153 |
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154 if (uuid == null || uuid.equals("")) { |
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155 System.err.println("Found an invalid CollectionItem!"); |
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156 } |
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157 |
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158 Node outputmodes = (Node) XMLUtils.xpath( |
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159 node, |
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160 "art:outputmodes", |
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161 XPathConstants.NODE, |
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162 ArtifactNamespaceContext.INSTANCE); |
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163 |
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164 List<OutputMode> modes = parseOutputModes(outputmodes); |
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165 |
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166 return new DefaultCollectionItem(uuid, hash, modes); |
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167 } |
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168 |
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169 |
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170 /** |
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171 * This method extracts the OutputModes available for a specific |
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172 * CollectionItem and returns them as list. |
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173 * |
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174 * @param node The root node of the outputmodes list. |
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175 * |
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176 * @return a list of OutputModes. |
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177 */ |
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178 protected List<OutputMode> parseOutputModes(Node node) { |
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179 System.out.println("AddArtifactServiceImpl.parseOutputModes"); |
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180 |
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181 if (node == null) { |
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182 System.err.println("The node for parsing OutputModes is null!"); |
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183 return null; |
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184 } |
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185 |
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186 NodeList list = (NodeList) XMLUtils.xpath( |
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187 node, |
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188 "art:output", |
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189 XPathConstants.NODESET, |
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190 ArtifactNamespaceContext.INSTANCE); |
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191 |
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192 if (list == null || list.getLength() == 0) { |
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193 System.err.println("No outputmode nodes found!"); |
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194 return null; |
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195 } |
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196 |
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197 int size = list.getLength(); |
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198 |
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199 List<OutputMode> modes = new ArrayList<OutputMode>(size); |
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200 |
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201 for (int i = 0; i < size; i++) { |
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202 Node tmp = list.item(i); |
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203 String name = XMLUtils.xpathString( |
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204 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE); |
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205 String desc = XMLUtils.xpathString( |
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206 tmp, "@art:description", ArtifactNamespaceContext.INSTANCE); |
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207 String mime = XMLUtils.xpathString( |
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208 tmp, "@art:mime-type", ArtifactNamespaceContext.INSTANCE); |
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209 |
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210 if (name == null || name.equals("")) { |
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211 System.err.println("Found an invalid output mode."); |
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212 |
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213 continue; |
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214 } |
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215 |
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216 // TODO Parse Facets |
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217 |
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218 modes.add(new DefaultOutputMode(name, desc, mime)); |
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219 } |
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220 |
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221 return modes; |
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222 } |
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223 } |
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224 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |