Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/collections/FLYSArtifactCollection.java @ 348:635af5381a4d
Added an abstract OutGenerator that should be the base class for all generators which create charts.
flys-artifacts/trunk@1750 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 27 Apr 2011 14:40:44 +0000 |
parents | a63d8bdb2d79 |
children | 2465dc296395 |
rev | line source |
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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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19 |
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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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28 |
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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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32 |
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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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36 |
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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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45 |
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46 |
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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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53 |
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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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58 |
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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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89 |
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90 try { |
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91 String[] artifactUUIDs = getArtifactUUIDs(context); |
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92 |
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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 { |
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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 } |
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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)); |
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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 |
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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 /** |
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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 |
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397 protected Element buildArtifactNode( |
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398 ArtifactDatabase database, |
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399 String uuid, |
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400 CallContext context, |
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401 XMLUtils.ElementCreator ec) |
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402 throws ArtifactDatabaseException |
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403 { |
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404 log.debug("Append artifact '" + uuid + "' to collection description"); |
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405 |
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406 // TODO |
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407 String hash = "MYHASH"; |
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408 |
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409 Element ci = ec.create("artifact"); |
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410 ec.addAttr(ci, "uuid", uuid, true); |
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411 ec.addAttr(ci, "hash", hash, true); |
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412 |
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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 |
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417 Node outputModes = (Node) XMLUtils.xpath( |
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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 } |
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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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441 parse(output); |
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442 } |
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443 |
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444 protected void parse(Document output) { |
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445 NodeList themes = (NodeList) XMLUtils.xpath( |
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446 output, |
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447 "art:output/art:theme", |
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448 XPathConstants.NODESET, |
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449 ArtifactNamespaceContext.INSTANCE); |
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450 |
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451 int num = themes != null ? themes.getLength() : 0; |
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452 |
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453 logger.debug("Output has " + num + " elements."); |
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454 |
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455 if (num == 0) { |
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456 return; |
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457 } |
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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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461 |
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462 String name = XMLUtils.xpathString( |
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463 theme, "@art:facet", ArtifactNamespaceContext.INSTANCE); |
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464 |
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465 String uuid = XMLUtils.xpathString( |
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466 theme, "@art:artifact", ArtifactNamespaceContext.INSTANCE); |
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467 |
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468 String pos = XMLUtils.xpathString( |
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469 theme, "@art:pos", ArtifactNamespaceContext.INSTANCE); |
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470 |
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471 String active = XMLUtils.xpathString( |
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472 theme, "@art:active", ArtifactNamespaceContext.INSTANCE); |
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473 |
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474 addTheme(uuid, name, pos, active); |
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475 } |
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476 } |
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477 |
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478 protected void addTheme( |
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479 String uuid, |
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480 String name, |
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481 String position, |
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482 String active) |
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483 { |
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484 if (logger.isDebugEnabled()) { |
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485 logger.debug("Add theme: "); |
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486 logger.debug(".. name: " + name); |
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487 logger.debug(".. uuid: " + uuid); |
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488 logger.debug(".. position: " + position); |
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489 logger.debug(".. active: " + active); |
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490 } |
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491 |
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492 try { |
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493 Integer pos = new Integer(position); |
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494 Integer act = new Integer(active); |
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495 |
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496 themes.put(pos, new ManagedFacet(name, null, uuid, pos, act)); |
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497 } |
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498 catch (NumberFormatException nfe) { |
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499 // do nothing |
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500 } |
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501 } |
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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.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
346
diff
changeset
|
503 public ManagedFacet get(int idx) { |
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
|
504 return themes.get(new Integer(idx)); |
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
|
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>
parents:
346
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
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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 : |