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annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 270:d01b0d81b92a

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Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new). flys-client/trunk@1895 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 11 May 2011 09:11:40 +0000
parents 924da6695800
children ba238f917b94
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.DefaultFacet;
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29 import de.intevation.flys.client.shared.model.DefaultOutputMode;
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30 import de.intevation.flys.client.shared.model.ExportMode;
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31 import de.intevation.flys.client.shared.model.Facet;
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32 import de.intevation.flys.client.shared.model.OutputMode;
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33 import de.intevation.flys.client.client.services.DescribeCollectionService;
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34
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35
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36 /**
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37 * This service implements a method that queries the DESCRIBE document of a
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38 * specific collection and returns a Collection object with the information of
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39 * the document.
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40 *
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41 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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42 */
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43 public class DescribeCollectionServiceImpl
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44 extends RemoteServiceServlet
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45 implements DescribeCollectionService
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46 {
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47 /** The error message key that is thrown if an error occured while
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48 * describe() a Collection.*/
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49 public static final String ERROR_DESCRIBE_COLLECTION =
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50 "error_describe_collection";
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51
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52 public static final String XPATH_FACETS = "art:facets/art:facet";
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54
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55 public Collection describe(String uuid, String serverUrl, String locale)
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56 throws ServerException
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57 {
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58 System.out.println("DescribeCollectionServiceImpl.describe");
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59
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60 Document describe = ClientProtocolUtils.newDescribeCollectionDocument(
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61 uuid);
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62
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63 HttpClient client = new HttpClientImpl(serverUrl, locale);
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64
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65 try {
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66 Document response = (Document) client.doCollectionAction(
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67 describe, uuid, new DocumentResponseHandler());
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68
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69 Collection c = parseCollection(response);
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70
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71 if (c == null) {
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72 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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73 }
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74
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75 return c;
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76 }
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77 catch (ConnectionException ce) {
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78 System.err.println(ce.getLocalizedMessage());
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79 }
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80
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81 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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82 }
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83
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84
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85 /**
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86 * This method takes the DESCRIBE document of the Collections describe()
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87 * operation and extracts the information about the collection itself and
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88 * the collection items.
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89 *
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90 * @param description The DESCRIBE document of the Collections describe()
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91 * operation.
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92 *
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93 * @return a Collection with CollectionItems.
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94 */
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95 protected Collection parseCollection(Document description) {
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96 System.out.println("AddArtifactServiceImpl.parseCollection");
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97
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98 if (description == null) {
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99 System.err.println("The DESCRIBE of the Collection is null!");
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100 return null;
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101 }
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102
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103 String uuid = XMLUtils.xpathString(
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104 description,
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105 "art:artifact-collection/@art:uuid",
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106 ArtifactNamespaceContext.INSTANCE);
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107
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108 if (uuid == null || uuid.equals("")) {
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109 System.err.println("Found an invalid Collection!");
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110 return null;
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111 }
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112
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113 Collection c = new DefaultCollection(uuid);
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114
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115 NodeList items = (NodeList) XMLUtils.xpath(
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116 description,
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117 "art:artifact-collection/art:artifacts/art:artifact",
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118 XPathConstants.NODESET,
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119 ArtifactNamespaceContext.INSTANCE);
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120
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121 if (items == null || items.getLength() == 0) {
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122 System.out.println("No collection item found for this collection.");
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123
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124 return c;
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125 }
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126
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127 int size = items.getLength();
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128
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129 for (int i = 0; i < size; i++) {
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130 CollectionItem item = parseCollectionItem(items.item(i));
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131
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132 if (item != null) {
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133 c.addItem(item);
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134 }
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135 }
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136
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137 System.out.println(
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138 "Found " + c.getItemLength() + " collection items " +
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139 "for the Collection '" + c.identifier() + "'.");
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140
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141 return c;
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142 }
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143
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144
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145 /**
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146 * This method extracts the CollectionItem from <i>node</i> with its output
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147 * modes. The output modes are parsed using the parseOutputModes() method.
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148 *
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149 * @param node A node that contains information about a CollectionItem.
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150 *
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151 * @return a CollectionItem.
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152 */
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153 protected CollectionItem parseCollectionItem(Node node) {
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154 System.out.println("AddArtifactServiceImpl.parseCollectionItem");
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155
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156 if (node == null) {
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157 System.err.println("The node for parsing CollectionItem is null!");
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158 return null;
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159 }
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160
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161 String uuid = XMLUtils.xpathString(
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162 node, "@art:uuid", ArtifactNamespaceContext.INSTANCE);
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163
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164 String hash = XMLUtils.xpathString(
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165 node, "@art:hash", ArtifactNamespaceContext.INSTANCE);
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166
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167 if (uuid == null || uuid.equals("")) {
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168 System.err.println("Found an invalid CollectionItem!");
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169 }
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170
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171 Node outputmodes = (Node) XMLUtils.xpath(
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172 node,
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173 "art:outputmodes",
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174 XPathConstants.NODE,
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175 ArtifactNamespaceContext.INSTANCE);
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176
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177 List<OutputMode> modes = parseOutputModes(outputmodes);
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178
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179 return new DefaultCollectionItem(uuid, hash, modes);
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180 }
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181
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182
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183 /**
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184 * This method extracts the OutputModes available for a specific
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185 * CollectionItem and returns them as list.
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186 *
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187 * @param node The root node of the outputmodes list.
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188 *
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189 * @return a list of OutputModes.
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190 */
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191 protected List<OutputMode> parseOutputModes(Node node) {
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192 System.out.println("AddArtifactServiceImpl.parseOutputModes");
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193
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194 if (node == null) {
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195 System.err.println("The node for parsing OutputModes is null!");
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196 return null;
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197 }
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198
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199 NodeList list = (NodeList) XMLUtils.xpath(
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200 node,
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201 "art:output",
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202 XPathConstants.NODESET,
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203 ArtifactNamespaceContext.INSTANCE);
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204
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205 if (list == null || list.getLength() == 0) {
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206 System.err.println("No outputmode nodes found!");
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207 return null;
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208 }
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209
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210 int size = list.getLength();
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211
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212 List<OutputMode> modes = new ArrayList<OutputMode>(size);
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213
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214 for (int i = 0; i < size; i++) {
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215 Node tmp = list.item(i);
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216 String name = XMLUtils.xpathString(
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217 tmp, "@art:name", ArtifactNamespaceContext.INSTANCE);
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218 String desc = XMLUtils.xpathString(
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219 tmp, "@art:description", ArtifactNamespaceContext.INSTANCE);
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220 String mime = XMLUtils.xpathString(
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221 tmp, "@art:mime-type", ArtifactNamespaceContext.INSTANCE);
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222
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223 if (name == null || name.equals("")) {
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224 System.err.println("Found an invalid output mode.");
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225
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226 continue;
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227 }
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228
270
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229 OutputMode outmode = null;
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230 List<Facet> fs = extractFacets(tmp);
99
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231
270
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232 if (name.indexOf("export") > -1) {
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233 outmode = new ExportMode(name, desc, mime, fs);
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234 }
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235 else {
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236 outmode = new DefaultOutputMode(name, desc, mime, fs);
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237 }
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238
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239 modes.add(outmode);
99
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240 }
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241
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242 return modes;
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243 }
270
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244
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245
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246 protected static List<Facet> extractFacets(Node outmode) {
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247 System.out.println("ArtifactDescriptionFactory - extractFacets()");
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248
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249 NodeList facetList = (NodeList) XMLUtils.xpath(
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250 outmode,
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251 XPATH_FACETS,
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252 XPathConstants.NODESET,
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253 ArtifactNamespaceContext.INSTANCE);
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254
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255 int num = facetList != null ? facetList.getLength() : 0;
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256
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257 List<Facet> facets = new ArrayList<Facet>(num);
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258
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259 for (int i = 0; i < num; i++) {
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260 Node facetNode = facetList.item(i);
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261
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
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parents: 229
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262 String name = XMLUtils.xpathString(
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
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parents: 229
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263 facetNode, "@art:name", ArtifactNamespaceContext.INSTANCE);
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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264
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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265 if (name != null && name.length() > 0) {
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
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parents: 229
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266 facets.add(new DefaultFacet(name));
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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267 }
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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268 }
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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269
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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270 return facets;
d01b0d81b92a Parse the facets of a Collection and distinguish between an ordinary OutputMode and an ExportMode (new).
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 229
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271 }
99
5c3d685546a6 Added a new service to describe collections.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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272 }
5c3d685546a6 Added a new service to describe collections.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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273 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org