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annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 99:5c3d685546a6

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Added a new service to describe collections. flys-client/trunk@1613 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 30 Mar 2011 07:35:59 +0000
parents
children f7967d12ce6e
rev   line source
99
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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 :
http://dive4elements.wald.intevation.org