Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/FLYSArtifactCollection.java @ 347:a63d8bdb2d79

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Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme. flys-artifacts/trunk@1749 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 27 Apr 2011 14:35:44 +0000
parents 16161de47662
children 2465dc296395
rev   line source
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76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
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1 package de.intevation.flys.collections;
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2
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3 import java.io.IOException;
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4 import java.io.OutputStream;
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5 import java.util.ArrayList;
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6 import java.util.Date;
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7 import java.util.HashMap;
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8 import java.util.List;
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9 import java.util.Map;
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10
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11 import javax.xml.xpath.XPathConstants;
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12
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13 import org.apache.log4j.Logger;
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14
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15 import org.w3c.dom.Document;
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16 import org.w3c.dom.Element;
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17 import org.w3c.dom.Node;
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18 import org.w3c.dom.NodeList;
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20 import de.intevation.artifacts.Artifact;
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21 import de.intevation.artifacts.ArtifactDatabase;
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22 import de.intevation.artifacts.ArtifactDatabaseException;
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23 import de.intevation.artifacts.ArtifactNamespaceContext;
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24 import de.intevation.artifacts.CallContext;
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25 import de.intevation.artifacts.CallMeta;
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26
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27 import de.intevation.artifacts.common.utils.XMLUtils;
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29 import de.intevation.artifactdatabase.Backend;
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30 import de.intevation.artifactdatabase.Backend.PersistentArtifact;
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31 import de.intevation.artifactdatabase.DefaultArtifactCollection;
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33 import de.intevation.flys.artifacts.context.FLYSContext;
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34 import de.intevation.flys.artifacts.model.ManagedFacet;
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35 import de.intevation.flys.exports.OutGenerator;
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37
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38 /**
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39 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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40 */
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41 public class FLYSArtifactCollection extends DefaultArtifactCollection {
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42
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43 /** The logger used in this class.*/
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44 private static Logger log = Logger.getLogger(FLYSArtifactCollection.class);
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47 /** Constant XPath that points to the outputmodes of an artifact.*/
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48 public static final String XPATH_ARTIFACT_OUTPUTMODES =
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49 "/art:result/art:outputmodes";
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50
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51 public static final String XPATH_COLLECTION_ITEMS =
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52 "/art:result/art:artifact-collection/art:collection-item";
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54 public static final String XPATH_OUT_NAME = "/art:action/@art:name";
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55
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56 public static final String XPATH_OUT_TYPE = "/art:action/@art:type";
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57
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59
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60 @Override
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61 public Document describe(CallContext context) {
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62 log.debug("FLYSArtifactCollection.describe: " + identifier);
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63
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64 Document doc = XMLUtils.newDocument();
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65
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66 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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67 doc,
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68 ArtifactNamespaceContext.NAMESPACE_URI,
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69 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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70
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71 Date creationTime = getCreationTime();
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72 String creation = creationTime != null
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73 ? Long.toString(creationTime.getTime())
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74 : "";
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75
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76 Element collection = ec.create("artifact-collection");
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77 Element artifacts = ec.create("artifacts");
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78 Element attributes = ec.create("attribute");
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79
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80 ec.addAttr(collection, "name", getName(), true);
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81 ec.addAttr(collection, "uuid", identifier(), true);
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82 ec.addAttr(collection, "creation", creation, true);
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83
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84 collection.appendChild(artifacts);
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85 collection.appendChild(attributes);
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86 doc.appendChild(collection);
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87
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88 ArtifactDatabase db = context.getDatabase();
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90 try {
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91 String[] artifactUUIDs = getArtifactUUIDs(context);
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93 Document oldAttrs = getAttribute();
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94 Document attrs = buildAttributes(
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95 db, context,
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96 oldAttrs,
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97 artifactUUIDs);
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98
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99 db.setCollectionAttribute(identifier(), context.getMeta(), attrs);
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100
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101 Node child = attrs.getFirstChild();
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102 attributes.appendChild(doc.importNode(child, true));
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103
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104 for (String uuid: artifactUUIDs) {
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105 try {
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106 artifacts.appendChild(
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107 buildArtifactNode(db, uuid, context, ec));
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108 }
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109 catch (ArtifactDatabaseException dbe) {
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110 log.warn(dbe, dbe);
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111 }
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112 }
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113 }
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114 catch (ArtifactDatabaseException ade) {
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115 log.error(ade, ade);
147
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116 }
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117
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118 return doc;
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119 }
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120
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121
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122 @Override
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123 public void out(Document format, OutputStream out, CallContext context)
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124 throws IOException
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125 {
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126 log.info("FLYSArtifactCollection.out");
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127
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128 String name = XMLUtils.xpathString(
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129 format, XPATH_OUT_NAME, ArtifactNamespaceContext.INSTANCE);
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130
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131 String type = XMLUtils.xpathString(
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132 format, XPATH_OUT_TYPE, ArtifactNamespaceContext.INSTANCE);
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133
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134 OutGenerator generator = getOutGenerator(context, name, type);
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135 if (generator == null) {
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136 log.error("There is no generator specified for output: " + type);
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137 // TODO throw an exception.
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138
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139 return;
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140 }
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141
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142 generator.init(format, out, context);
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143
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144 try {
347
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145 doOut(generator, getAttribute(context, name), context);
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146 }
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147 catch (ArtifactDatabaseException adbe) {
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148 log.error(adbe, adbe);
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149 }
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150 }
300
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151
347
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152
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153 /**
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154 * This method creates the concrete output.
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155 *
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156 * @param generator The OutGenerator that creates the output.
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157 * @param attributes The collection's attributes for this concrete output
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158 * type.
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159 * @param context The context object.
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160 */
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161 protected void doOut(
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162 OutGenerator generator,
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163 Document attributes,
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164 CallContext context)
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165 throws IOException
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166 {
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167 log.debug("FLYSArtifactCollection.doOut");
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168
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169 ThemeList themeList = new ThemeList(attributes);
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170
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171 int size = themeList.size();
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172 log.debug("Output will contain " + size + " elements.");
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173
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174 try {
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175 for (int i = 0; i < size; i++) {
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176 ManagedFacet theme = themeList.get(i);
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177
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178 if (theme == null) {
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179 continue;
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180 }
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181
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182 String art = theme.getArtifact();
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183
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184 if (log.isDebugEnabled()) {
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185 log.debug("Do output for...");
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186 log.debug("... artifact: " + art);
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187 log.debug("... facet: " + theme.getName());
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188 }
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189
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190 generator.doOut(
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191 getArtifact(art, context),
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192 getArtifactAttribute(art, context));
300
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193 }
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194 }
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195 catch (ArtifactDatabaseException ade) {
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196 log.error(ade, ade);
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197 }
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198
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199 generator.generate();
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200 }
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201
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202
346
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203 protected Document buildAttributes(
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204 ArtifactDatabase db,
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205 CallContext context,
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206 Document oldAttr,
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207 String[] items)
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208 {
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209 Document doc = XMLUtils.newDocument();
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210
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211 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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212 doc,
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213 ArtifactNamespaceContext.NAMESPACE_URI,
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214 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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215
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216 AttributeParser aParser = new AttributeParser();
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217 OutputParser oParser = new OutputParser(db, context.getMeta());
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218
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219 for (String uuid: items) {
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220 try {
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221 oParser.parse(uuid);
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222 }
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223 catch (ArtifactDatabaseException ade) {
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224 log.warn(ade, ade);
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225 }
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226 }
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227
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228 aParser.parse(oldAttr);
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229
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230 return new AttributeWriter(aParser.getOuts(), oParser.getOuts()).write();
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231 }
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232
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233
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234 /**
347
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235 * Returns the attribute for a specific output type.
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236 *
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237 * @param output The name of the desired output type.
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238 *
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239 * @return the attribute for the desired output type.
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240 */
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241 protected Document getAttribute(CallContext context, String output)
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242 throws ArtifactDatabaseException
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243 {
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244 Document attr = buildAttributes(
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245 context.getDatabase(),
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246 context,
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247 getAttribute(),
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248 getArtifactUUIDs(context));
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249
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250 Node out = (Node) XMLUtils.xpath(
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251 attr,
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252 "art:output[@name='" + output + "']",
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253 XPathConstants.NODE,
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254 ArtifactNamespaceContext.INSTANCE);
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255
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256
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257 if (out != null) {
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258 Document o = XMLUtils.newDocument();
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259
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260 o.appendChild(o.importNode(out, true));
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261
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262 return o;
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263 }
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264
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265 return null;
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266 }
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267
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268
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269 /**
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270 * This method returns the list of artifact UUIDs that this collections
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271 * contains.
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272 *
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273 * @param context The CallContext that is necessary to get information about
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274 * the ArtifactDatabase.
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275 *
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276 * @return a list of uuids.
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277 */
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278 protected String[] getArtifactUUIDs(CallContext context)
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279 throws ArtifactDatabaseException
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280 {
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281 log.debug("FLYSArtifactCollection.getArtifactUUIDs");
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282
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283 ArtifactDatabase db = context.getDatabase();
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284 CallMeta meta = context.getMeta();
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285
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286 Document itemList = db.listCollectionArtifacts(identifier(), meta);
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287 NodeList items = (NodeList) XMLUtils.xpath(
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288 itemList,
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289 XPATH_COLLECTION_ITEMS,
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290 XPathConstants.NODESET,
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291 ArtifactNamespaceContext.INSTANCE);
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292
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293 if (items == null || items.getLength() == 0) {
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294 log.debug("No artifacts found in this collection.");
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295 return null;
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296 }
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297
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298 int num = items.getLength();
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299
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300 List<String> uuids = new ArrayList<String>(num);
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301
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302 for (int i = 0; i < num; i++) {
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303 String uuid = XMLUtils.xpathString(
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304 items.item(i),
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305 "@art:uuid",
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306 ArtifactNamespaceContext.INSTANCE);
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307
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308 if (uuid != null && uuid.trim().length() != 0) {
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309 uuids.add(uuid);
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310 }
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311 }
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312
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313 return (String[]) uuids.toArray(new String[uuids.size()]);
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314 }
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315
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316
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317 /**
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318 * Returns a concrete Artifact of this collection specified by its uuid.
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319 *
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320 * @param uuid The Artifact's uuid.
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321 * @param context The CallContext.
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322 *
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323 * @return an Artifact.
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324 */
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325 protected Artifact getArtifact(String uuid, CallContext context)
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326 throws ArtifactDatabaseException
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327 {
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328 log.debug("FLYSArtifactCollection.getArtifact");
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329
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330 Backend backend = Backend.getInstance();
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331 PersistentArtifact persistent = backend.getArtifact(uuid);
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332
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333 return persistent != null ? persistent.getArtifact() : null;
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334 }
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335
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336
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337 /**
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338 * Returns the attribute that belongs to an artifact stored in this
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339 * collection.
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340 *
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341 * @param uuid The Artifact's uuid.
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342 * @param context The CallContext.
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343 *
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344 * @return an attribute in form of a document.
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345 */
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346 protected Document getArtifactAttribute(String uuid, CallContext context)
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347 throws ArtifactDatabaseException
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348 {
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349 log.debug("FLYSArtifactCollection.getArtifactAttribute");
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350
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351 // TODO FILL ME
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352 return null;
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353 }
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354
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355
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356 /**
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357 * Returns the OutGenerator for a specified <i>type</i>.
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358 *
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359 * @param name The name of the output type.
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360 * @param type Defines the type of the desired OutGenerator.
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361 *
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362 * @return The OutGenerator specified by <i>type</i>.
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363 */
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364 protected OutGenerator getOutGenerator(
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365 CallContext context,
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366 String name,
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367 String type)
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368 {
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369 FLYSContext flysContext = context instanceof FLYSContext
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370 ? (FLYSContext) context
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371 : (FLYSContext) context.globalContext();
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372
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373 Map<String, Class> generators = (Map<String, Class>)
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374 flysContext.get(FLYSContext.OUTGENERATORS_KEY);
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375
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376 if (generators == null) {
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377 log.error("No output generators found in the running application!");
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378 return null;
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379 }
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380
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381 Class clazz = generators.get(type);
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382
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383 try {
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384 return clazz != null ? (OutGenerator) clazz.newInstance() : null;
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385 }
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386 catch (InstantiationException ie) {
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387 log.error(ie, ie);
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388 }
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389 catch (IllegalAccessException iae) {
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390 log.error(iae, iae);
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391 }
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392
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393 return null;
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394 }
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395
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396
147
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397 protected Element buildArtifactNode(
293
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398 ArtifactDatabase database,
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399 String uuid,
147
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400 CallContext context,
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401 XMLUtils.ElementCreator ec)
293
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402 throws ArtifactDatabaseException
147
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403 {
293
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404 log.debug("Append artifact '" + uuid + "' to collection description");
147
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405
346
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406 // TODO
293
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407 String hash = "MYHASH";
156
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408
147
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409 Element ci = ec.create("artifact");
148
2649ada6b053 Bugfix: Added a missing artifact namespace prefix in the DESCRIBE document of a FLYSArtifactCollection.
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410 ec.addAttr(ci, "uuid", uuid, true);
293
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411 ec.addAttr(ci, "hash", hash, true);
147
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412
346
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413 // XXX I am not sure if it works well every time with an empty document
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414 // in the describe operation of an artifact.
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415 Document description = database.describe(uuid, null, context.getMeta());
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416
293
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417 Node outputModes = (Node) XMLUtils.xpath(
147
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418 description,
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419 XPATH_ARTIFACT_OUTPUTMODES,
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420 XPathConstants.NODE,
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421 ArtifactNamespaceContext.INSTANCE);
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422
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423 if (outputModes != null) {
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424 Document doc = ci.getOwnerDocument();
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425 ci.appendChild(doc.importNode(outputModes, true));
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426 }
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427
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428 return ci;
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429 }
347
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430
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431
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432 /**
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433 * Inner class to structure/order the themes of a chart.
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434 */
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435 private class ThemeList {
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436 private Logger logger = Logger.getLogger(ThemeList.class);
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437 protected Map<Integer, ManagedFacet> themes;
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438
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439 public ThemeList(Document output) {
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440 themes = new HashMap<Integer, ManagedFacet>();
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diff changeset
441 parse(output);
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442 }
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443
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diff changeset
444 protected void parse(Document output) {
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diff changeset
445 NodeList themes = (NodeList) XMLUtils.xpath(
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diff changeset
446 output,
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diff changeset
447 "art:output/art:theme",
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diff changeset
448 XPathConstants.NODESET,
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diff changeset
449 ArtifactNamespaceContext.INSTANCE);
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450
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diff changeset
451 int num = themes != null ? themes.getLength() : 0;
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diff changeset
452
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diff changeset
453 logger.debug("Output has " + num + " elements.");
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diff changeset
454
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diff changeset
455 if (num == 0) {
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diff changeset
456 return;
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457 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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458
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459 for (int i = 0; i < num; i++) {
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460 Node theme = themes.item(i);
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parents: 346
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461
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
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462 String name = XMLUtils.xpathString(
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
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463 theme, "@art:facet", ArtifactNamespaceContext.INSTANCE);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
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464
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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465 String uuid = XMLUtils.xpathString(
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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466 theme, "@art:artifact", ArtifactNamespaceContext.INSTANCE);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
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467
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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468 String pos = XMLUtils.xpathString(
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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469 theme, "@art:pos", ArtifactNamespaceContext.INSTANCE);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
diff changeset
470
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
471 String active = XMLUtils.xpathString(
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
472 theme, "@art:active", ArtifactNamespaceContext.INSTANCE);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
473
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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474 addTheme(uuid, name, pos, active);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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475 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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476 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
477
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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478 protected void addTheme(
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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479 String uuid,
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480 String name,
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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481 String position,
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parents: 346
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482 String active)
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
483 {
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
diff changeset
484 if (logger.isDebugEnabled()) {
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485 logger.debug("Add theme: ");
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parents: 346
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486 logger.debug(".. name: " + name);
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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parents: 346
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487 logger.debug(".. uuid: " + uuid);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
488 logger.debug(".. position: " + position);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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489 logger.debug(".. active: " + active);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
490 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
491
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
492 try {
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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493 Integer pos = new Integer(position);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
494 Integer act = new Integer(active);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
495
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
496 themes.put(pos, new ManagedFacet(name, null, uuid, pos, act));
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
497 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
498 catch (NumberFormatException nfe) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
499 // do nothing
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
500 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
501 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
502
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
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diff changeset
503 public ManagedFacet get(int idx) {
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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504 return themes.get(new Integer(idx));
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
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505 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
506
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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diff changeset
507 public int size() {
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
508 return themes.size();
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
509 }
a63d8bdb2d79 Improved the out() operation of a Collection - the OutGenerator gets to know about the facets and its theme.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 346
diff changeset
510 }
147
76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
511 }
76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
diff changeset
512 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org