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annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 101:f7967d12ce6e

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Removed useless imports. flys-client/trunk@1617 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 30 Mar 2011 07:54:07 +0000
parents 5c3d685546a6
children e02f50a3ad59
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.Collection;
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24 import de.intevation.flys.client.shared.model.CollectionItem;
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25 import de.intevation.flys.client.shared.model.DefaultCollection;
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26 import de.intevation.flys.client.shared.model.DefaultCollectionItem;
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27 import de.intevation.flys.client.shared.model.DefaultOutputMode;
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28 import de.intevation.flys.client.shared.model.OutputMode;
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29 import de.intevation.flys.client.client.services.DescribeCollectionService;
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30
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31
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32 /**
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33 * This service implements a method that queries the DESCRIBE document of a
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34 * specific collection and returns a Collection object with the information of
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35 * the document.
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36 *
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public class DescribeCollectionServiceImpl
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40 extends RemoteServiceServlet
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41 implements DescribeCollectionService
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42 {
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43 public Collection describe(String uuid, String serverUrl) {
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44 System.out.println("DescribeCollectionServiceImpl.describe");
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45
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46 Document describe = ClientProtocolUtils.newDescribeCollectionDocument(
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47 uuid);
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48
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49 HttpClient client = new HttpClientImpl(serverUrl);
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50
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51 try {
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52 Document response = (Document) client.doCollectionAction(
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53 describe, uuid, new DocumentResponseHandler());
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54
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55 Collection c = parseCollection(response);
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56
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57 if (c == null) {
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58 throw new NullPointerException("No collection returned.");
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59 }
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60
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61 return c;
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62 }
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63 catch (ConnectionException ce) {
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64 System.err.println(ce.getLocalizedMessage());
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65 }
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66
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67 return null;
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68 }
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69
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70
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71 /**
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72 * This method takes the DESCRIBE document of the Collections describe()
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73 * operation and extracts the information about the collection itself and
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74 * the collection items.
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75 *
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76 * @param description The DESCRIBE document of the Collections describe()
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77 * operation.
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78 *
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79 * @return a Collection with CollectionItems.
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80 */
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81 protected Collection parseCollection(Document description) {
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82 System.out.println("AddArtifactServiceImpl.parseCollection");
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83
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84 if (description == null) {
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85 System.err.println("The DESCRIBE of the Collection is null!");
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86 return null;
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87 }
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88
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89 String uuid = XMLUtils.xpathString(
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90 description,
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91 "art:artifact-collection/@art:uuid",
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92 ArtifactNamespaceContext.INSTANCE);
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93
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94 if (uuid == null || uuid.equals("")) {
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95 System.err.println("Found an invalid Collection!");
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96 return null;
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97 }
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98
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99 Collection c = new DefaultCollection(uuid);
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100
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101 NodeList items = (NodeList) XMLUtils.xpath(
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102 description,
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103 "art:artifact-collection/art:artifacts/art:artifact",
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104 XPathConstants.NODESET,
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105 ArtifactNamespaceContext.INSTANCE);
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106
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107 if (items == null || items.getLength() == 0) {
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108 System.out.println("No collection item found for this collection.");
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109
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110 return c;
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111 }
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112
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113 int size = items.getLength();
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114
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115 for (int i = 0; i < size; i++) {
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116 CollectionItem item = parseCollectionItem(items.item(i));
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117
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118 if (item != null) {
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119 c.addItem(item);
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120 }
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121 }
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122
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123 System.out.println(
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124 "Found " + c.getItemLength() + " collection items " +
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125 "for the Collection '" + c.identifier() + "'.");
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126
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127 return c;
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128 }
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129
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130
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131 /**
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132 * This method extracts the CollectionItem from <i>node</i> with its output
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133 * modes. The output modes are parsed using the parseOutputModes() method.
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134 *
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135 * @param node A node that contains information about a CollectionItem.
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136 *
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137 * @return a CollectionItem.
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138 */
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139 protected CollectionItem parseCollectionItem(Node node) {
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140 System.out.println("AddArtifactServiceImpl.parseCollectionItem");
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141
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142 if (node == null) {
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143 System.err.println("The node for parsing CollectionItem is null!");
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144 return null;
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145 }
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146
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147 String uuid = XMLUtils.xpathString(
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148 node, "@art:uuid", ArtifactNamespaceContext.INSTANCE);
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149
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150 String hash = XMLUtils.xpathString(
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151 node, "@art:hash", ArtifactNamespaceContext.INSTANCE);
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152
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153 if (uuid == null || uuid.equals("")) {
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154 System.err.println("Found an invalid CollectionItem!");
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155 }
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156
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157 Node outputmodes = (Node) XMLUtils.xpath(
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158 node,
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159 "art:outputmodes",
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160 XPathConstants.NODE,
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161 ArtifactNamespaceContext.INSTANCE);
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162
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163 List<OutputMode> modes = parseOutputModes(outputmodes);
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164
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165 return new DefaultCollectionItem(uuid, hash, modes);
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166 }
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167
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168
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169 /**
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170 * This method extracts the OutputModes available for a specific
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171 * CollectionItem and returns them as list.
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172 *
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173 * @param node The root node of the outputmodes list.
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174 *
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175 * @return a list of OutputModes.
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176 */
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177 protected List<OutputMode> parseOutputModes(Node node) {
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178 System.out.println("AddArtifactServiceImpl.parseOutputModes");
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179
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180 if (node == null) {
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181 System.err.println("The node for parsing OutputModes is null!");
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182 return null;
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183 }
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184
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185 NodeList list = (NodeList) XMLUtils.xpath(
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186 node,
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187 "art:output",
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188 XPathConstants.NODESET,
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189 ArtifactNamespaceContext.INSTANCE);
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190
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191 if (list == null || list.getLength() == 0) {
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192 System.err.println("No outputmode nodes found!");
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193 return null;
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194 }
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195
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196 int size = list.getLength();
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197
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198 List<OutputMode> modes = new ArrayList<OutputMode>(size);
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199
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200 for (int i = 0; i < size; i++) {
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201 Node tmp = list.item(i);
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202 String name = XMLUtils.xpathString(
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203 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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204 String desc = XMLUtils.xpathString(
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205 tmp, "@art:description", ArtifactNamespaceContext.INSTANCE);
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206 String mime = XMLUtils.xpathString(
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207 tmp, "@art:mime-type", ArtifactNamespaceContext.INSTANCE);
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208
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209 if (name == null || name.equals("")) {
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210 System.err.println("Found an invalid output mode.");
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211
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212 continue;
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213 }
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214
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215 // TODO Parse Facets
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216
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217 modes.add(new DefaultOutputMode(name, desc, mime));
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218 }
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219
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220 return modes;
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221 }
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222 }
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223 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org