Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/FLYSArtifactCollection.java @ 346:16161de47662

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The Attributes of a collection are written into its DESCRIBE now. flys-artifacts/trunk@1748 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 26 Apr 2011 13:29:18 +0000
parents 9a0e1289bab6
children a63d8bdb2d79
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.List;
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8 import java.util.Map;
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9
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10 import javax.xml.xpath.XPathConstants;
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11
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12 import org.apache.log4j.Logger;
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13
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14 import org.w3c.dom.Document;
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15 import org.w3c.dom.Element;
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16 import org.w3c.dom.Node;
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17 import org.w3c.dom.NodeList;
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19 import de.intevation.artifacts.Artifact;
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20 import de.intevation.artifacts.ArtifactDatabase;
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21 import de.intevation.artifacts.ArtifactDatabaseException;
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22 import de.intevation.artifacts.ArtifactNamespaceContext;
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23 import de.intevation.artifacts.CallContext;
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24 import de.intevation.artifacts.CallMeta;
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25
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26 import de.intevation.artifacts.common.utils.XMLUtils;
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28 import de.intevation.artifactdatabase.Backend;
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29 import de.intevation.artifactdatabase.Backend.PersistentArtifact;
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30 import de.intevation.artifactdatabase.DefaultArtifactCollection;
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32 import de.intevation.flys.artifacts.context.FLYSContext;
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33 import de.intevation.flys.exports.OutGenerator;
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35
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36 /**
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37 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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38 */
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39 public class FLYSArtifactCollection extends DefaultArtifactCollection {
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40
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41 /** The logger used in this class.*/
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42 private static Logger log = Logger.getLogger(FLYSArtifactCollection.class);
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44
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45 /** Constant XPath that points to the outputmodes of an artifact.*/
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46 public static final String XPATH_ARTIFACT_OUTPUTMODES =
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47 "/art:result/art:outputmodes";
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48
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49 public static final String XPATH_COLLECTION_ITEMS =
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50 "/art:result/art:artifact-collection/art:collection-item";
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51
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52 public static final String XPATH_OUT_NAME = "/art:action/@art:name";
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53
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54 public static final String XPATH_OUT_TYPE = "/art:action/@art:type";
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57
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58 @Override
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59 public Document describe(CallContext context) {
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60 log.debug("FLYSArtifactCollection.describe: " + identifier);
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61
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62 Document doc = XMLUtils.newDocument();
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64 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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65 doc,
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66 ArtifactNamespaceContext.NAMESPACE_URI,
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67 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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68
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69 Date creationTime = getCreationTime();
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70 String creation = creationTime != null
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71 ? Long.toString(creationTime.getTime())
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72 : "";
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73
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74 Element collection = ec.create("artifact-collection");
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75 Element artifacts = ec.create("artifacts");
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76 Element attributes = ec.create("attribute");
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78 ec.addAttr(collection, "name", getName(), true);
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79 ec.addAttr(collection, "uuid", identifier(), true);
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80 ec.addAttr(collection, "creation", creation, true);
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81
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82 collection.appendChild(artifacts);
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83 collection.appendChild(attributes);
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84 doc.appendChild(collection);
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85
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86 ArtifactDatabase db = context.getDatabase();
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88 try {
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89 String[] artifactUUIDs = getArtifactUUIDs(context);
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91 Document oldAttrs = getAttribute();
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92 Document attrs = buildAttributes(
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93 db, context,
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94 oldAttrs,
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95 artifactUUIDs);
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96
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97 db.setCollectionAttribute(identifier(), context.getMeta(), attrs);
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98
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99 Node child = attrs.getFirstChild();
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100 attributes.appendChild(doc.importNode(child, true));
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101
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102 for (String uuid: artifactUUIDs) {
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103 try {
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104 artifacts.appendChild(
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105 buildArtifactNode(db, uuid, context, ec));
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106 }
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107 catch (ArtifactDatabaseException dbe) {
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108 log.warn(dbe, dbe);
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109 }
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110 }
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111 }
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112 catch (ArtifactDatabaseException ade) {
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113 log.error(ade, ade);
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114 }
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115
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116 return doc;
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117 }
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118
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119
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120 @Override
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121 public void out(Document format, OutputStream out, CallContext context)
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122 throws IOException
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123 {
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124 log.info("FLYSArtifactCollection.out");
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125
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126 String name = XMLUtils.xpathString(
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127 format, XPATH_OUT_NAME, ArtifactNamespaceContext.INSTANCE);
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128
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129 String type = XMLUtils.xpathString(
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130 format, XPATH_OUT_TYPE, ArtifactNamespaceContext.INSTANCE);
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131
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132 OutGenerator generator = getOutGenerator(context, name, type);
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133 if (generator == null) {
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134 log.error("There is no generator specified for output: " + type);
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135 // TODO throw an exception.
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136
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137 return;
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138 }
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139
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140 generator.init(format, out, context);
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141
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142 try {
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143 Object[][] container = getArtifactsWithAttribute(context);
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144
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145 for (Object[] obj: container) {
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146 generator.doOut((Artifact) obj[0], (Document) obj[1]);
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147 }
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148 }
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149 catch (ArtifactDatabaseException ade) {
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150 log.error(ade, ade);
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151 }
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152
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153 generator.generate();
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154 }
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155
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156
346
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157 protected Document buildAttributes(
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158 ArtifactDatabase db,
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159 CallContext context,
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160 Document oldAttr,
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161 String[] items)
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162 {
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163 Document doc = XMLUtils.newDocument();
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164
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165 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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166 doc,
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167 ArtifactNamespaceContext.NAMESPACE_URI,
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168 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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169
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170 AttributeParser aParser = new AttributeParser();
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171 OutputParser oParser = new OutputParser(db, context.getMeta());
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172
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173 for (String uuid: items) {
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174 try {
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175 oParser.parse(uuid);
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176 }
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177 catch (ArtifactDatabaseException ade) {
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178 log.warn(ade, ade);
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179 }
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180 }
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181
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182 aParser.parse(oldAttr);
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183
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184 return new AttributeWriter(aParser.getOuts(), oParser.getOuts()).write();
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185 }
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186
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187
300
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188 /**
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189 * This method returns the list of artifact UUIDs that this collections
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190 * contains.
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191 *
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192 * @param context The CallContext that is necessary to get information about
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193 * the ArtifactDatabase.
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194 *
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195 * @return a list of uuids.
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196 */
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197 protected String[] getArtifactUUIDs(CallContext context)
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198 throws ArtifactDatabaseException
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199 {
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200 log.debug("FLYSArtifactCollection.getArtifactUUIDs");
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201
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202 ArtifactDatabase db = context.getDatabase();
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203 CallMeta meta = context.getMeta();
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204
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205 Document itemList = db.listCollectionArtifacts(identifier(), meta);
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206 NodeList items = (NodeList) XMLUtils.xpath(
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207 itemList,
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208 XPATH_COLLECTION_ITEMS,
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209 XPathConstants.NODESET,
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210 ArtifactNamespaceContext.INSTANCE);
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211
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212 if (items == null || items.getLength() == 0) {
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213 log.debug("No artifacts found in this collection.");
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214 return null;
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215 }
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216
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217 int num = items.getLength();
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218
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219 List<String> uuids = new ArrayList<String>(num);
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220
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221 for (int i = 0; i < num; i++) {
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222 String uuid = XMLUtils.xpathString(
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223 items.item(i),
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224 "@art:uuid",
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225 ArtifactNamespaceContext.INSTANCE);
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226
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227 if (uuid != null && uuid.trim().length() != 0) {
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228 uuids.add(uuid);
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229 }
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230 }
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231
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232 return (String[]) uuids.toArray(new String[uuids.size()]);
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233 }
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234
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235
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236 /**
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237 * Returns a concrete Artifact of this collection specified by its uuid.
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238 *
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239 * @param uuid The Artifact's uuid.
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240 * @param context The CallContext.
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241 *
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242 * @return an Artifact.
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243 */
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244 protected Artifact getArtifact(String uuid, CallContext context)
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245 throws ArtifactDatabaseException
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246 {
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247 log.debug("FLYSArtifactCollection.getArtifact");
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248
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249 Backend backend = Backend.getInstance();
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250 PersistentArtifact persistent = backend.getArtifact(uuid);
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251
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252 return persistent != null ? persistent.getArtifact() : null;
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253 }
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254
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255
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256 /**
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257 * Returns the attribute that belongs to an artifact stored in this
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258 * collection.
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259 *
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260 * @param uuid The Artifact's uuid.
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261 * @param context The CallContext.
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262 *
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263 * @return an attribute in form of a document.
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264 */
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265 protected Document getArtifactAttribute(String uuid, CallContext context)
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266 throws ArtifactDatabaseException
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267 {
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268 log.debug("FLYSArtifactCollection.getArtifactAttribute");
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269
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270 // TODO FILL ME
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271 return null;
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272 }
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273
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274
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275 /**
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276 * Returns a list of Artifact/Attribute pairs.
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277 *
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278 * @param context The CallContext.
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279 *
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280 * @return a list of Artifact/Attribute pairs.
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281 */
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282 protected Object[][] getArtifactsWithAttribute(CallContext context)
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283 throws ArtifactDatabaseException
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284 {
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285 log.debug("FLYSArtifactCollection.getArtifactWithAttribute");
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286
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287 ArtifactDatabase db = context.getDatabase();
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288 CallMeta meta = context.getMeta();
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289
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290 String[] uuids = getArtifactUUIDs(context);
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291 Object[][] awa = new Object[uuids.length][2];
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292
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293 for (int i = 0; i < uuids.length; i++) {
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294 try {
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295 Artifact artifact = getArtifact(uuids[i], context);
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296 Document attribute = getArtifactAttribute(uuids[i], context);
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297
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298 if (artifact == null) {
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299 log.warn("Artifact '" + uuids[i] + "' is not existing.");
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300 continue;
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301 }
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302
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303 awa[i][0] = artifact;
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304 awa[i][1] = attribute;
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305 }
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306 catch (ArtifactDatabaseException ade) {
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307 log.warn(ade, ade);
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308 }
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309 }
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310
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311 return awa;
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312 }
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313
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314
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315 /**
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316 * Returns the OutGenerator for a specified <i>type</i>.
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317 *
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318 * @param name The name of the output type.
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319 * @param type Defines the type of the desired OutGenerator.
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320 *
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321 * @return The OutGenerator specified by <i>type</i>.
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322 */
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323 protected OutGenerator getOutGenerator(
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324 CallContext context,
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325 String name,
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326 String type)
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327 {
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328 FLYSContext flysContext = context instanceof FLYSContext
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329 ? (FLYSContext) context
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330 : (FLYSContext) context.globalContext();
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331
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332 Map<String, Class> generators = (Map<String, Class>)
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333 flysContext.get(FLYSContext.OUTGENERATORS_KEY);
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334
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335 if (generators == null) {
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336 log.error("No output generators found in the running application!");
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337 return null;
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338 }
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339
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340 Class clazz = generators.get(type);
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341
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diff changeset
342 try {
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343 return clazz != null ? (OutGenerator) clazz.newInstance() : null;
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344 }
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345 catch (InstantiationException ie) {
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346 log.error(ie, ie);
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347 }
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348 catch (IllegalAccessException iae) {
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349 log.error(iae, iae);
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350 }
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351
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352 return null;
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353 }
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354
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355
147
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356 protected Element buildArtifactNode(
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357 ArtifactDatabase database,
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358 String uuid,
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359 CallContext context,
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360 XMLUtils.ElementCreator ec)
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361 throws ArtifactDatabaseException
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362 {
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363 log.debug("Append artifact '" + uuid + "' to collection description");
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364
346
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365 // TODO
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366 String hash = "MYHASH";
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367
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368 Element ci = ec.create("artifact");
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369 ec.addAttr(ci, "uuid", uuid, true);
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370 ec.addAttr(ci, "hash", hash, true);
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371
346
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372 // XXX I am not sure if it works well every time with an empty document
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373 // in the describe operation of an artifact.
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374 Document description = database.describe(uuid, null, context.getMeta());
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375
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376 Node outputModes = (Node) XMLUtils.xpath(
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377 description,
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378 XPATH_ARTIFACT_OUTPUTMODES,
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379 XPathConstants.NODE,
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380 ArtifactNamespaceContext.INSTANCE);
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381
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382 if (outputModes != null) {
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383 Document doc = ci.getOwnerDocument();
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384 ci.appendChild(doc.importNode(outputModes, true));
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385 }
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386
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387 return ci;
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388 }
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389 }
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390 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org