Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeCollectionServiceImpl.java @ 581:210339fd1a34

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Removed more expensive XPath. flys-client/trunk@2169 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 20 Jun 2011 16:25:48 +0000
parents 5277f46a63c2
children 78907f0fb939
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.HashMap;
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5 import java.util.List;
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6 import java.util.Map;
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7
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8 import javax.xml.xpath.XPathConstants;
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9
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10 import org.w3c.dom.Document;
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11 import org.w3c.dom.Element;
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12 import org.w3c.dom.Node;
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13 import org.w3c.dom.NodeList;
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14
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15 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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16
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17 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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18 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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19 import de.intevation.artifacts.common.utils.XMLUtils;
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20
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21 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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22 import de.intevation.artifacts.httpclient.http.HttpClient;
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23 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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24 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler;
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25
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26 import de.intevation.flys.client.shared.exceptions.ServerException;
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27 import de.intevation.flys.client.shared.model.Collection;
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28 import de.intevation.flys.client.shared.model.CollectionItem;
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29 import de.intevation.flys.client.shared.model.DefaultCollection;
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30 import de.intevation.flys.client.shared.model.DefaultCollectionItem;
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31 import de.intevation.flys.client.shared.model.DefaultFacet;
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32 import de.intevation.flys.client.shared.model.DefaultOutputMode;
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33 import de.intevation.flys.client.shared.model.DefaultTheme;
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34 import de.intevation.flys.client.shared.model.ExportMode;
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35 import de.intevation.flys.client.shared.model.Facet;
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36 import de.intevation.flys.client.shared.model.OutputMode;
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37 import de.intevation.flys.client.shared.model.Theme;
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38 import de.intevation.flys.client.shared.model.ThemeList;
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39 import de.intevation.flys.client.client.services.DescribeCollectionService;
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40
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41
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42 /**
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43 * This service implements a method that queries the DESCRIBE document of a
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44 * specific collection and returns a Collection object with the information of
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45 * the document.
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46 *
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47 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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48 */
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49 public class DescribeCollectionServiceImpl
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50 extends RemoteServiceServlet
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51 implements DescribeCollectionService
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52 {
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53 /** The error message key that is thrown if an error occured while
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54 * describe() a Collection.*/
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55 public static final String ERROR_DESCRIBE_COLLECTION =
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56 "error_describe_collection";
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57
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58 public static final String XPATH_FACETS = "art:facets/art:facet";
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59
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60
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61 public Collection describe(String uuid, String serverUrl, String locale)
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62 throws ServerException
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63 {
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64 System.out.println("DescribeCollectionServiceImpl.describe");
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65
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66 Document describe = ClientProtocolUtils.newDescribeCollectionDocument(
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67 uuid);
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68
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69 HttpClient client = new HttpClientImpl(serverUrl, locale);
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70
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71 try {
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72 Document response = (Document) client.doCollectionAction(
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73 describe, uuid, new DocumentResponseHandler());
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74
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75 Collection c = parseCollection(response);
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76
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77 if (c == null) {
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78 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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79 }
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80
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81 System.out.println("Collection successfully parsed.");
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82
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83 return c;
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84 }
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85 catch (ConnectionException ce) {
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86 System.err.println(ce.getLocalizedMessage());
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87 }
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88
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89 throw new ServerException(ERROR_DESCRIBE_COLLECTION);
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90 }
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91
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92
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93 /**
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94 * This method takes the DESCRIBE document of the Collections describe()
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95 * operation and extracts the information about the collection itself and
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96 * the collection items.
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97 *
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98 * @param description The DESCRIBE document of the Collections describe()
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99 * operation.
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100 *
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101 * @return a Collection with CollectionItems.
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102 */
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103 protected Collection parseCollection(Document description) {
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104 System.out.println("AddArtifactServiceImpl.parseCollection");
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105
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106 if (description == null) {
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107 System.err.println("The DESCRIBE of the Collection is null!");
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108 return null;
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109 }
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110
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111 String uuid = XMLUtils.xpathString(
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112 description,
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113 "art:artifact-collection/@art:uuid",
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114 ArtifactNamespaceContext.INSTANCE);
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115
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116 if (uuid == null || uuid.length() == 0) {
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117 System.err.println("Found an invalid Collection!");
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118 return null;
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119 }
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120
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121 Map<String, ThemeList> themeList = parseThemeLists(description);
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122
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123 Collection c = !themeList.isEmpty()
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124 ? new DefaultCollection(uuid, themeList)
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125 : new DefaultCollection(uuid);
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126
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127 NodeList items = (NodeList) XMLUtils.xpath(
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128 description,
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129 "art:artifact-collection/art:artifacts/art:artifact",
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130 XPathConstants.NODESET,
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131 ArtifactNamespaceContext.INSTANCE);
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132
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133 if (items == null || items.getLength() == 0) {
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134 System.out.println("No collection item found for this collection.");
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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 int size = items.getLength();
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140
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141 for (int i = 0; i < size; i++) {
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142 CollectionItem item = parseCollectionItem((Element)items.item(i));
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143
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144 if (item != null) {
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145 c.addItem(item);
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146 }
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147 }
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148
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149 System.out.println(
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150 "Found " + c.getItemLength() + " collection items " +
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151 "for the Collection '" + c.identifier() + "'.");
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152
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153 return c;
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154 }
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155
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156
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157 protected Map<String, ThemeList> parseThemeLists(Document description) {
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158 System.out.println("DescribeCollectionServiceImpl.parseThemeLists");
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159
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160 NodeList lists = (NodeList) XMLUtils.xpath(
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161 description,
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162 "/art:artifact-collection/art:attribute/art:outputs/art:output",
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163 XPathConstants.NODESET,
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164 ArtifactNamespaceContext.INSTANCE);
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165
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166 int num = lists != null ? lists.getLength() : 0;
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167
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168 Map<String, ThemeList> themeList = new HashMap<String, ThemeList>(num);
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169
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170 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
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171
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172 for (int i = 0; i < num; i++) {
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173 Element node = (Element)lists.item(i);
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174
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175 String outName = node.getAttribute("name");
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176
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177 if (outName.length() > 0) {
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178 ThemeList list = parseThemeList(node);
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179 if (list.getThemeCount() > 0) {
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180 themeList.put(outName, list);
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181 }
524
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182 }
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183 }
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184
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185 return themeList;
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186 }
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187
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188
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189 protected ThemeList parseThemeList(Element node) {
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190 System.out.println("DescribeCollectionServiceImpl.parseThemeList");
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191
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192 NodeList themes = node.getElementsByTagNameNS(
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193 ArtifactNamespaceContext.NAMESPACE_URI,
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194 "theme");
524
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195
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196 int num = themes != null ? themes.getLength() : 0;
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197
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198 List<Theme> themeList = new ArrayList<Theme>(num);
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199
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200 for (int i = 0; i < num; i++) {
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201 Theme theme = parseTheme((Element)themes.item(i));
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202
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203 if (theme != null) {
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204 themeList.add(theme);
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205 }
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206 }
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207
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208 return new ThemeList(themeList);
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209 }
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210
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211
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212 protected Theme parseTheme(Element ele) {
524
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213 System.out.println("DescribeCollectionServiceImpl.parseTheme");
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214
575
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215 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
524
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216
575
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217 String strAct = ele.getAttributeNS(uri, "active");
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diff changeset
218 String art = ele.getAttributeNS(uri, "artifact");
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219 String fac = ele.getAttributeNS(uri, "facet");
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220 String strPos = ele.getAttributeNS(uri, "pos");
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diff changeset
221 String desc = ele.getAttributeNS(uri, "description");
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222 String strIdx = ele.getAttributeNS(uri, "index");
524
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223
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224 if (strAct.length() > 0 && art.length() > 0 && fac.length() > 0
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diff changeset
225 && strPos.length() > 0 && strIdx.length() > 0)
575
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226 {
524
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227 try {
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228 int pos = Integer.valueOf(strPos);
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229 int active = Integer.valueOf(strAct);
575
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230 int idx = Integer.valueOf(strIdx);
524
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231
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diff changeset
232 return new DefaultTheme(pos, idx, active > 0, art, fac, desc);
524
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233 }
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234 catch (NumberFormatException nfe) {
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235 nfe.printStackTrace();
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236 }
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237 }
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238
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diff changeset
239 return null;
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240 }
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241
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242
99
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243 /**
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244 * This method extracts the CollectionItem from <i>node</i> with its output
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245 * modes. The output modes are parsed using the parseOutputModes() method.
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246 *
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247 * @param node A node that contains information about a CollectionItem.
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248 *
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249 * @return a CollectionItem.
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250 */
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251 protected CollectionItem parseCollectionItem(Element node) {
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252 System.out.println("AddArtifactServiceImpl.parseCollectionItem");
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253
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254 if (node == null) {
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255 System.err.println("The node for parsing CollectionItem is null!");
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256 return null;
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257 }
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258
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259 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
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260
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261 String uuid = node.getAttributeNS(uri, "uuid");
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262 String hash = node.getAttributeNS(uri, "hash");
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263
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264 if (uuid.length() == 0) {
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265 System.err.println("Found an invalid CollectionItem!");
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266 return null;
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267 }
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268
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269 NodeList outputmodes = node.getElementsByTagNameNS(uri, "outputmodes");
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270
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271 if (outputmodes.getLength() < 1) {
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272 return null;
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273 }
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274
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275 Element om = (Element)outputmodes.item(0);
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276
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277 List<OutputMode> modes = parseOutputModes(om);
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278
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279 return new DefaultCollectionItem(uuid, hash, modes);
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280 }
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281
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282
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283 /**
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284 * This method extracts the OutputModes available for a specific
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285 * CollectionItem and returns them as list.
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286 *
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287 * @param node The root node of the outputmodes list.
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288 *
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289 * @return a list of OutputModes.
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290 */
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291 protected List<OutputMode> parseOutputModes(Element node) {
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292 System.out.println("AddArtifactServiceImpl.parseOutputModes");
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293
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294 if (node == null) {
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295 System.err.println("The node for parsing OutputModes is null!");
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296 return null;
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297 }
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298
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299 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
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300
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301 NodeList list = node.getElementsByTagNameNS(uri, "output");
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302
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303 int size = list.getLength();
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304
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305 if (size == 0) {
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306 System.err.println("No outputmode nodes found!");
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307 return null;
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308 }
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309
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310 List<OutputMode> modes = new ArrayList<OutputMode>(size);
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311
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312 for (int i = 0; i < size; i++) {
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313 Element tmp = (Element)list.item(i);
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314
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315 String name = tmp.getAttributeNS(uri, "name");
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316 String desc = tmp.getAttributeNS(uri, "description");
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317 String mime = tmp.getAttributeNS(uri, "mime-type");
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318
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319 if (name.length() == 0) {
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320 System.err.println("Found an invalid output mode.");
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321 continue;
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322 }
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323
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324 OutputMode outmode = null;
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325 List<Facet> fs = extractFacets(tmp);
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326
270
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327 if (name.indexOf("export") > -1) {
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328 outmode = new ExportMode(name, desc, mime, fs);
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329 }
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330 else {
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331 outmode = new DefaultOutputMode(name, desc, mime, fs);
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332 }
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333
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334 modes.add(outmode);
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335 }
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336
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337 return modes;
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338 }
270
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339
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340
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341 protected static List<Facet> extractFacets(Element outmode) {
270
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342 System.out.println("ArtifactDescriptionFactory - extractFacets()");
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343
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344 NodeList facetList = (NodeList) XMLUtils.xpath(
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345 outmode,
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346 XPATH_FACETS,
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347 XPathConstants.NODESET,
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348 ArtifactNamespaceContext.INSTANCE);
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349
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350 int num = facetList != null ? facetList.getLength() : 0;
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351
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352 List<Facet> facets = new ArrayList<Facet>(num);
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353
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354 String uri = ArtifactNamespaceContext.NAMESPACE_URI;
270
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355
575
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356 for (int i = 0; i < num; i++) {
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357 Element facetEl = (Element) facetList.item(i);
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358
575
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359 String name = facetEl.getAttributeNS(uri, "name");
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360 String desc = facetEl.getAttributeNS(uri, "description");
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361 String index = facetEl.getAttributeNS(uri, "index");
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362
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363 if (name != null && name.length() > 0 && index != null) {
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364 facets.add(new DefaultFacet(name, Integer.valueOf(index),desc));
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365 }
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366 }
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367
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368 return facets;
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369 }
99
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370 }
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371 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org