1 | /** |
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2 | * |
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3 | */ |
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4 | package de.mpiwg.itgroup.annotations.neo4j; |
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5 | |
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6 | import java.util.ArrayList; |
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7 | import java.util.Calendar; |
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8 | import java.util.List; |
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9 | |
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10 | import org.apache.log4j.Logger; |
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11 | import org.neo4j.graphdb.Direction; |
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12 | import org.neo4j.graphdb.GraphDatabaseService; |
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13 | import org.neo4j.graphdb.Node; |
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14 | import org.neo4j.graphdb.Relationship; |
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15 | import org.neo4j.graphdb.RelationshipType; |
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16 | import org.neo4j.graphdb.Transaction; |
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17 | import org.neo4j.graphdb.index.Index; |
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18 | import org.neo4j.graphdb.index.IndexHits; |
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19 | |
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20 | import de.mpiwg.itgroup.annotations.Annotation; |
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21 | import de.mpiwg.itgroup.annotations.Annotation.FragmentTypes; |
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22 | |
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23 | /** |
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24 | * @author casties |
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25 | * |
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26 | */ |
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27 | public class AnnotationStore { |
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28 | |
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29 | protected static Logger logger = Logger.getLogger(AnnotationStore.class); |
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30 | |
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31 | protected GraphDatabaseService graphDb; |
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32 | |
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33 | public static enum NodeTypes { |
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34 | ANNOTATION, PERSON, TARGET |
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35 | } |
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36 | |
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37 | protected List<Index<Node>> nodeIndexes; |
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38 | |
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39 | public static enum RelationTypes implements RelationshipType { |
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40 | ANNOTATES, CREATED |
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41 | } |
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42 | |
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43 | public static String ANNOTATION_URI_BASE = "http://entities.mpiwg-berlin.mpg.de/annotations/"; |
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44 | |
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45 | public AnnotationStore(GraphDatabaseService graphDb) { |
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46 | super(); |
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47 | this.graphDb = graphDb; |
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48 | nodeIndexes = new ArrayList<Index<Node>>(3); |
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49 | // List.set(enum.ordinal(), val) seems not to work. |
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50 | nodeIndexes.add(NodeTypes.ANNOTATION.ordinal(), graphDb.index().forNodes("annotations")); |
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51 | nodeIndexes.add(NodeTypes.PERSON.ordinal(), graphDb.index().forNodes("persons")); |
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52 | nodeIndexes.add(NodeTypes.TARGET.ordinal(), graphDb.index().forNodes("targets")); |
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53 | } |
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54 | |
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55 | protected Index<Node> getNodeIndex(NodeTypes type) { |
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56 | return nodeIndexes.get(type.ordinal()); |
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57 | } |
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58 | |
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59 | /** |
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60 | * Returns the Annotation with the given id. |
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61 | * |
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62 | * @param id |
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63 | * @return |
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64 | */ |
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65 | public Annotation getAnnotationById(String id) { |
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66 | Node annotNode = getNodeIndex(NodeTypes.ANNOTATION).get("id", id).getSingle(); |
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67 | Annotation annot = createAnnotation(annotNode); |
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68 | return annot; |
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69 | } |
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70 | |
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71 | /** |
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72 | * Returns an Annotation object from an annotation-Node. |
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73 | * |
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74 | * @param annotNode |
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75 | * @return |
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76 | */ |
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77 | public Annotation createAnnotation(Node annotNode) { |
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78 | Annotation annot = new Annotation(); |
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79 | annot.setUri((String) annotNode.getProperty("id", null)); |
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80 | annot.setBodyText((String) annotNode.getProperty("bodyText", null)); |
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81 | annot.setBodyUri((String) annotNode.getProperty("bodyUri", null)); |
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82 | // get annotation target from relation |
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83 | Iterable<Relationship> targetRels = annotNode |
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84 | .getRelationships(RelationTypes.ANNOTATES); |
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85 | for (Relationship targetRel : targetRels) { |
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86 | Node target = targetRel.getEndNode(); |
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87 | annot.setTargetBaseUri((String) target.getProperty("uri", null)); |
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88 | // just the first one |
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89 | break; |
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90 | } |
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91 | annot.setTargetFragment((String) annotNode.getProperty( |
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92 | "targetFragment", null)); |
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93 | String ft = (String) annotNode.getProperty("fragmentType", null); |
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94 | if (ft != null) { |
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95 | annot.setFragmentType(FragmentTypes.valueOf(ft)); |
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96 | } |
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97 | // get creator form relation |
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98 | Iterable<Relationship> creatorRels = annotNode |
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99 | .getRelationships(RelationTypes.CREATED); |
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100 | for (Relationship creatorRel : creatorRels) { |
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101 | Node creator = creatorRel.getStartNode(); |
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102 | annot.setCreatorUri((String) creator.getProperty("uri", null)); |
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103 | annot.setCreatorName((String) creator.getProperty("name", null)); |
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104 | // just the first one |
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105 | break; |
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106 | } |
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107 | annot.setCreated((String) annotNode.getProperty("created", null)); |
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108 | return annot; |
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109 | } |
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110 | |
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111 | /** |
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112 | * Store a new annotation in the store or update an existing one. Returns |
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113 | * the stored annotation. |
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114 | * |
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115 | * @param annot |
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116 | * @return |
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117 | */ |
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118 | public Annotation storeAnnotation(Annotation annot) { |
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119 | Node annotNode = null; |
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120 | Transaction tx = graphDb.beginTx(); |
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121 | try { |
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122 | /* |
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123 | * create or get the annotation |
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124 | */ |
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125 | String id = annot.getUri(); |
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126 | if (id == null) { |
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127 | id = createRessourceURI("annot:"); |
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128 | } |
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129 | annotNode = getOrCreateAnnotationNode(id); |
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130 | |
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131 | /* |
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132 | * the annotation body |
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133 | */ |
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134 | String bodyText = annot.getBodyText(); |
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135 | if (bodyText != null) { |
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136 | annotNode.setProperty("bodyText", bodyText); |
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137 | } |
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138 | String bodyUri = annot.getBodyUri(); |
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139 | if (bodyUri != null) { |
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140 | annotNode.setProperty("bodyUri", bodyUri); |
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141 | } |
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142 | |
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143 | /* |
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144 | * the annotation target |
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145 | */ |
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146 | String targetBaseUri = annot.getTargetBaseUri(); |
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147 | if (targetBaseUri != null) { |
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148 | Node target = getOrCreateTargetNode(targetBaseUri); |
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149 | getOrCreateRelation(annotNode, RelationTypes.ANNOTATES, target); |
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150 | } |
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151 | |
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152 | /* |
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153 | * The fragment part of the annotation target. |
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154 | */ |
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155 | String targetFragment = annot.getTargetFragment(); |
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156 | FragmentTypes fragmentType = annot.getFragmentType(); |
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157 | if (targetFragment != null) { |
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158 | annotNode.setProperty("targetFragment", targetFragment); |
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159 | annotNode.setProperty("fragmentType", fragmentType.name()); |
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160 | } |
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161 | |
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162 | /* |
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163 | * The name of the creator of this annotation. |
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164 | */ |
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165 | String creatorName = annot.getCreatorName(); |
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166 | |
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167 | /* |
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168 | * The URI of the creator of this annotation. |
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169 | */ |
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170 | String creatorUri = annot.getCreatorUri(); |
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171 | if (creatorUri != null) { |
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172 | Node creator = getOrCreatePersonNode(creatorUri, creatorName); |
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173 | getOrCreateRelation(creator, RelationTypes.CREATED, annotNode); |
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174 | } |
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175 | |
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176 | /* |
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177 | * The creation date of this annotation. |
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178 | */ |
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179 | String created = annot.getCreated(); |
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180 | if (created != null) { |
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181 | annotNode.setProperty("created", created); |
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182 | } |
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183 | |
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184 | tx.success(); |
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185 | } finally { |
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186 | tx.finish(); |
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187 | } |
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188 | |
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189 | // re-read and return annotation |
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190 | Annotation storedAnnot = createAnnotation(annotNode); |
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191 | return storedAnnot; |
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192 | } |
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193 | |
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194 | /** |
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195 | * Deletes the annotation with the given id. |
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196 | * |
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197 | * @param id |
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198 | */ |
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199 | public void deleteById(String id) { |
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200 | Node annotNode = getNodeIndex(NodeTypes.ANNOTATION).get("id", id).getSingle(); |
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201 | if (annotNode != null) { |
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202 | // delete related objects |
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203 | Transaction tx = graphDb.beginTx(); |
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204 | try { |
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205 | for (Relationship rel : annotNode.getRelationships()) { |
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206 | // delete relation and the related node if it has no other relations |
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207 | Node other = rel.getOtherNode(annotNode); |
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208 | rel.delete(); |
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209 | if (! other.hasRelationship()) { |
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210 | deleteNode(other); |
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211 | } |
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212 | } |
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213 | if (! annotNode.hasRelationship()) { |
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214 | deleteNode(annotNode); |
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215 | } else { |
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216 | logger.error("deleteById: unable to delete: Node still has relations."); |
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217 | } |
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218 | tx.success(); |
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219 | } finally { |
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220 | tx.finish(); |
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221 | } |
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222 | } |
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223 | |
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224 | } |
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225 | |
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226 | /** |
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227 | * Returns all annotations with the given uri and/or user. |
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228 | * |
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229 | * @param uri |
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230 | * @param userUri |
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231 | * @param limit |
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232 | * @param offset |
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233 | * @return |
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234 | */ |
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235 | public List<Annotation> searchByUriUser(String targetUri, String userUri, |
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236 | String limit, String offset) { |
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237 | List<Annotation> annotations = new ArrayList<Annotation>(); |
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238 | if (targetUri != null) { |
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239 | // there should be only one |
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240 | Node target = getNodeIndex(NodeTypes.TARGET).get("uri", targetUri).getSingle(); |
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241 | if (target != null) { |
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242 | Iterable<Relationship> relations = target |
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243 | .getRelationships(RelationTypes.ANNOTATES); |
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244 | for (Relationship relation : relations) { |
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245 | Node ann = relation.getStartNode(); |
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246 | if (ann.getProperty("TYPE", "").equals("ANNOTATION")) { |
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247 | Annotation annot = createAnnotation(ann); |
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248 | annotations.add(annot); |
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249 | } else { |
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250 | logger.error("ANNOTATES relation does not start with ANNOTATION: " |
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251 | + ann); |
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252 | } |
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253 | } |
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254 | } |
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255 | } |
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256 | if (userUri != null) { |
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257 | // there should be only one |
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258 | Node person = getNodeIndex(NodeTypes.PERSON).get("uri", userUri).getSingle(); |
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259 | if (person != null) { |
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260 | Iterable<Relationship> relations = person |
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261 | .getRelationships(RelationTypes.CREATED); |
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262 | for (Relationship relation : relations) { |
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263 | Node ann = relation.getEndNode(); |
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264 | if (ann.getProperty("TYPE", "").equals("ANNOTATION")) { |
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265 | Annotation annot = createAnnotation(ann); |
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266 | annotations.add(annot); |
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267 | } else { |
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268 | logger.error("CREATED relation does not end with ANNOTATION: " |
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269 | + ann); |
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270 | } |
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271 | } |
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272 | } |
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273 | } |
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274 | return annotations; |
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275 | } |
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276 | |
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277 | protected Relationship getOrCreateRelation(Node start, |
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278 | RelationshipType type, Node end) { |
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279 | if (start.hasRelationship()) { |
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280 | // there are relations |
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281 | Iterable<Relationship> rels = start.getRelationships(type, |
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282 | Direction.OUTGOING); |
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283 | for (Relationship rel : rels) { |
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284 | if (rel.getEndNode().equals(end)) { |
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285 | // relation exists |
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286 | return rel; |
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287 | } |
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288 | } |
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289 | } |
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290 | // create new one |
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291 | Relationship rel; |
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292 | Transaction tx = graphDb.beginTx(); |
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293 | try { |
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294 | rel = start.createRelationshipTo(end, type); |
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295 | tx.success(); |
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296 | } finally { |
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297 | tx.finish(); |
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298 | } |
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299 | return rel; |
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300 | } |
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301 | |
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302 | protected Node getOrCreateAnnotationNode(String id) { |
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303 | Index<Node> idx = getNodeIndex(NodeTypes.ANNOTATION); |
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304 | IndexHits<Node> annotations = idx.get("id", id); |
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305 | Node annotation = annotations.getSingle(); |
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306 | if (annotation == null) { |
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307 | // does not exist yet |
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308 | Transaction tx = graphDb.beginTx(); |
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309 | try { |
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310 | annotation = graphDb.createNode(); |
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311 | annotation.setProperty("TYPE", NodeTypes.ANNOTATION.name()); |
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312 | annotation.setProperty("id", id); |
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313 | idx.add(annotation, "id", id); |
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314 | tx.success(); |
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315 | } finally { |
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316 | tx.finish(); |
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317 | } |
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318 | } |
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319 | return annotation; |
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320 | } |
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321 | |
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322 | protected Node getOrCreateTargetNode(String uri) { |
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323 | Index<Node> idx = getNodeIndex(NodeTypes.TARGET); |
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324 | IndexHits<Node> targets = idx.get("uri", uri); |
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325 | Node target = targets.getSingle(); |
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326 | if (target == null) { |
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327 | // does not exist yet |
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328 | Transaction tx = graphDb.beginTx(); |
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329 | try { |
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330 | target = graphDb.createNode(); |
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331 | target.setProperty("TYPE", NodeTypes.TARGET.name()); |
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332 | target.setProperty("uri", uri); |
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333 | idx.add(target, "uri", uri); |
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334 | tx.success(); |
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335 | } finally { |
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336 | tx.finish(); |
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337 | } |
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338 | } |
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339 | return target; |
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340 | } |
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341 | |
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342 | protected Node getOrCreatePersonNode(String uri, String name) { |
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343 | // Person is identified by URI |
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344 | Index<Node> idx = getNodeIndex(NodeTypes.PERSON); |
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345 | IndexHits<Node> persons = idx.get("uri", uri); |
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346 | Node person = persons.getSingle(); |
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347 | if (person == null) { |
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348 | // does not exist yet |
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349 | Transaction tx = graphDb.beginTx(); |
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350 | try { |
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351 | person = graphDb.createNode(); |
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352 | person.setProperty("TYPE", NodeTypes.PERSON.name()); |
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353 | person.setProperty("uri", uri); |
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354 | idx.add(person, "uri", uri); |
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355 | if (name != null) { |
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356 | person.setProperty("name", name); |
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357 | } |
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358 | tx.success(); |
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359 | } finally { |
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360 | tx.finish(); |
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361 | } |
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362 | } |
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363 | return person; |
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364 | } |
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365 | |
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366 | /** |
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367 | * Unindexes and deletes given Node if it has no relations. |
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368 | * @param node |
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369 | */ |
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370 | protected void deleteNode(Node node) { |
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371 | Transaction tx = graphDb.beginTx(); |
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372 | try { |
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373 | if (node.hasRelationship()) { |
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374 | logger.error("deleteNode: unable to delete: Node still has relations."); |
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375 | } else { |
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376 | String ts = (String) node.getProperty("TYPE", null); |
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377 | try { |
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378 | NodeTypes type = NodeTypes.valueOf(ts); |
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379 | getNodeIndex(type).remove(node); |
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380 | } catch (Exception e) { |
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381 | logger.error("deleteNode: unable to get TYPE of node: "+node); |
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382 | } |
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383 | node.delete(); |
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384 | } |
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385 | tx.success(); |
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386 | } finally { |
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387 | tx.finish(); |
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388 | } |
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389 | } |
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390 | |
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391 | /** |
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392 | * Erzeuge eine urn aus der aktuellen Zeit in millis |
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393 | * |
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394 | * @return |
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395 | */ |
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396 | private String createRessourceURI(String prefix) { |
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397 | |
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398 | Calendar cal = Calendar.getInstance(); |
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399 | |
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400 | long time = cal.getTimeInMillis(); |
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401 | |
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402 | return String.format("%s%s%s", ANNOTATION_URI_BASE, prefix, time); |
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403 | |
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404 | } |
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405 | |
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406 | } |
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