Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/collections/FLYSArtifactCollection.java @ 300:9a0e1289bab6

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The FLYSArtifactCollection overrides out() and uses OutGenerators to create output for this operation. flys-artifacts/trunk@1649 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 06 Apr 2011 10:01:49 +0000
parents 8d0932c2c2ef
children 16161de47662
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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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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52 public static final String XPATH_OUT_NAME = "/art:action/@art:name";
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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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63
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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
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77 ec.addAttr(collection, "name", getName(), true);
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78 ec.addAttr(collection, "uuid", identifier(), true);
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79 ec.addAttr(collection, "creation", creation, true);
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80
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81 collection.appendChild(artifacts);
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82 doc.appendChild(collection);
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83
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84 Document attribute = getAttribute();
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85 if (attribute != null) {
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86 Node child = attribute.getFirstChild();
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87 collection.appendChild(doc.importNode(child, true));
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88 }
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90 ArtifactDatabase db = context.getDatabase();
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92 try {
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93 String[] artifactUUIDs = getArtifactUUIDs(context);
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95 for (String uuid: artifactUUIDs) {
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96 try {
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97 artifacts.appendChild(
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98 buildArtifactNode(db, uuid, context, ec));
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99 }
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100 catch (ArtifactDatabaseException dbe) {
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101 log.warn(dbe, dbe);
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102 }
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103 }
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104 }
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105 catch (ArtifactDatabaseException ade) {
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106 log.error(ade, ade);
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107 }
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108
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109 return doc;
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110 }
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112
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113 @Override
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114 public void out(Document format, OutputStream out, CallContext context)
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115 throws IOException
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116 {
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117 log.info("FLYSArtifactCollection.out");
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118
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119 String name = XMLUtils.xpathString(
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120 format, XPATH_OUT_NAME, ArtifactNamespaceContext.INSTANCE);
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121
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122 String type = XMLUtils.xpathString(
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123 format, XPATH_OUT_TYPE, ArtifactNamespaceContext.INSTANCE);
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124
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125 OutGenerator generator = getOutGenerator(context, name, type);
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126 if (generator == null) {
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127 log.error("There is no generator specified for output: " + type);
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128 // TODO throw an exception.
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129
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130 return;
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131 }
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132
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133 generator.init(format, out, context);
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134
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135 try {
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136 Object[][] container = getArtifactsWithAttribute(context);
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137
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138 for (Object[] obj: container) {
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139 generator.doOut((Artifact) obj[0], (Document) obj[1]);
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140 }
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141 }
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142 catch (ArtifactDatabaseException ade) {
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143 log.error(ade, ade);
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144 }
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145
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146 generator.generate();
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147 }
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148
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149
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150 /**
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151 * This method returns the list of artifact UUIDs that this collections
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152 * contains.
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153 *
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154 * @param context The CallContext that is necessary to get information about
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155 * the ArtifactDatabase.
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156 *
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157 * @return a list of uuids.
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158 */
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159 protected String[] getArtifactUUIDs(CallContext context)
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160 throws ArtifactDatabaseException
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161 {
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162 log.debug("FLYSArtifactCollection.getArtifactUUIDs");
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163
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164 ArtifactDatabase db = context.getDatabase();
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165 CallMeta meta = context.getMeta();
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166
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167 Document itemList = db.listCollectionArtifacts(identifier(), meta);
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168 NodeList items = (NodeList) XMLUtils.xpath(
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169 itemList,
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170 XPATH_COLLECTION_ITEMS,
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171 XPathConstants.NODESET,
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172 ArtifactNamespaceContext.INSTANCE);
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173
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174 if (items == null || items.getLength() == 0) {
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175 log.debug("No artifacts found in this collection.");
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176 return null;
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177 }
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178
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179 int num = items.getLength();
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180
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181 List<String> uuids = new ArrayList<String>(num);
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182
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183 for (int i = 0; i < num; i++) {
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184 String uuid = XMLUtils.xpathString(
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185 items.item(i),
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186 "@art:uuid",
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187 ArtifactNamespaceContext.INSTANCE);
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188
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189 if (uuid != null && uuid.trim().length() != 0) {
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190 uuids.add(uuid);
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191 }
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192 }
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193
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194 return (String[]) uuids.toArray(new String[uuids.size()]);
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195 }
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196
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197
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198 /**
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199 * Returns a concrete Artifact of this collection specified by its uuid.
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200 *
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201 * @param uuid The Artifact's uuid.
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202 * @param context The CallContext.
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203 *
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204 * @return an Artifact.
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205 */
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206 protected Artifact getArtifact(String uuid, CallContext context)
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207 throws ArtifactDatabaseException
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208 {
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209 log.debug("FLYSArtifactCollection.getArtifact");
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210
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211 Backend backend = Backend.getInstance();
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212 PersistentArtifact persistent = backend.getArtifact(uuid);
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213
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214 return persistent != null ? persistent.getArtifact() : null;
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215 }
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216
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217
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218 /**
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219 * Returns the attribute that belongs to an artifact stored in this
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220 * collection.
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221 *
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222 * @param uuid The Artifact's uuid.
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223 * @param context The CallContext.
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224 *
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225 * @return an attribute in form of a document.
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226 */
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227 protected Document getArtifactAttribute(String uuid, CallContext context)
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228 throws ArtifactDatabaseException
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229 {
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230 log.debug("FLYSArtifactCollection.getArtifactAttribute");
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231
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232 // TODO FILL ME
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233 return null;
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234 }
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235
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236
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237 /**
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238 * Returns a list of Artifact/Attribute pairs.
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239 *
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240 * @param context The CallContext.
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241 *
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242 * @return a list of Artifact/Attribute pairs.
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243 */
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244 protected Object[][] getArtifactsWithAttribute(CallContext context)
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245 throws ArtifactDatabaseException
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246 {
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247 log.debug("FLYSArtifactCollection.getArtifactWithAttribute");
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248
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249 ArtifactDatabase db = context.getDatabase();
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250 CallMeta meta = context.getMeta();
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251
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252 String[] uuids = getArtifactUUIDs(context);
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253 Object[][] awa = new Object[uuids.length][2];
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254
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255 for (int i = 0; i < uuids.length; i++) {
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256 try {
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257 Artifact artifact = getArtifact(uuids[i], context);
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258 Document attribute = getArtifactAttribute(uuids[i], context);
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259
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260 if (artifact == null) {
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261 log.warn("Artifact '" + uuids[i] + "' is not existing.");
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262 continue;
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263 }
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264
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265 awa[i][0] = artifact;
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266 awa[i][1] = attribute;
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267 }
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268 catch (ArtifactDatabaseException ade) {
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269 log.warn(ade, ade);
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270 }
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271 }
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272
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273 return awa;
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274 }
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275
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276
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277 /**
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278 * Returns the OutGenerator for a specified <i>type</i>.
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279 *
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280 * @param name The name of the output type.
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281 * @param type Defines the type of the desired OutGenerator.
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282 *
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283 * @return The OutGenerator specified by <i>type</i>.
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284 */
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285 protected OutGenerator getOutGenerator(
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286 CallContext context,
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287 String name,
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288 String type)
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289 {
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290 FLYSContext flysContext = context instanceof FLYSContext
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291 ? (FLYSContext) context
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292 : (FLYSContext) context.globalContext();
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293
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294 Map<String, Class> generators = (Map<String, Class>)
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295 flysContext.get(FLYSContext.OUTGENERATORS_KEY);
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296
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297 if (generators == null) {
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298 log.error("No output generators found in the running application!");
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299 return null;
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300 }
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301
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302 Class clazz = generators.get(type);
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303
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304 try {
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305 return clazz != null ? (OutGenerator) clazz.newInstance() : null;
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306 }
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307 catch (InstantiationException ie) {
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308 log.error(ie, ie);
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309 }
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310 catch (IllegalAccessException iae) {
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311 log.error(iae, iae);
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312 }
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313
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314 return null;
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315 }
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316
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317
147
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318 protected Element buildArtifactNode(
293
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319 ArtifactDatabase database,
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320 String uuid,
147
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321 CallContext context,
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322 XMLUtils.ElementCreator ec)
293
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323 throws ArtifactDatabaseException
147
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324 {
293
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325 log.debug("Append artifact '" + uuid + "' to collection description");
147
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326
293
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327 // XXX I am not sure if it works well every time with an empty document
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328 // in the describe operation of an artifact.
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329 Document description = database.describe(uuid, null, context.getMeta());
147
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330
293
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331 String hash = "MYHASH";
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332 // TODO
156
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333
147
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334 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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335 ec.addAttr(ci, "uuid", uuid, true);
293
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336 ec.addAttr(ci, "hash", hash, true);
147
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337
293
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338 Node outputModes = (Node) XMLUtils.xpath(
147
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339 description,
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340 XPATH_ARTIFACT_OUTPUTMODES,
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341 XPathConstants.NODE,
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342 ArtifactNamespaceContext.INSTANCE);
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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343
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344 if (outputModes != null) {
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345 Document doc = ci.getOwnerDocument();
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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346 ci.appendChild(doc.importNode(outputModes, true));
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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347 }
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348
76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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349 return ci;
76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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350 }
76cc1a66a05f Implemented a FLYSArtifactCollection that will be used in this application now.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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351 }
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Ingo Weinzierl <ingo.weinzierl@intevation.de>
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352 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org