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.HashSet; |
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9 | import java.util.List; |
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10 | import java.util.Set; |
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11 | |
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12 | import org.apache.log4j.Logger; |
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13 | import org.neo4j.graphdb.Direction; |
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14 | import org.neo4j.graphdb.GraphDatabaseService; |
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15 | import org.neo4j.graphdb.Node; |
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16 | import org.neo4j.graphdb.Relationship; |
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17 | import org.neo4j.graphdb.RelationshipType; |
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18 | import org.neo4j.graphdb.Transaction; |
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19 | import org.neo4j.graphdb.index.Index; |
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20 | import org.neo4j.graphdb.index.IndexHits; |
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21 | |
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22 | import de.mpiwg.itgroup.annotations.Actor; |
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23 | import de.mpiwg.itgroup.annotations.Annotation; |
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24 | import de.mpiwg.itgroup.annotations.Annotation.FragmentTypes; |
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25 | import de.mpiwg.itgroup.annotations.Group; |
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26 | import de.mpiwg.itgroup.annotations.Person; |
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27 | |
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28 | /** |
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29 | * @author casties |
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30 | * |
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31 | */ |
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32 | public class AnnotationStore { |
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33 | |
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34 | protected static Logger logger = Logger.getLogger(AnnotationStore.class); |
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35 | |
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36 | protected GraphDatabaseService graphDb; |
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37 | |
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38 | public static enum NodeTypes { |
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39 | ANNOTATION, PERSON, TARGET, GROUP, TAG |
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40 | } |
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41 | |
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42 | protected List<Index<Node>> nodeIndexes; |
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43 | |
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44 | public static enum RelationTypes implements RelationshipType { |
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45 | ANNOTATES, CREATED, PERMITS_ADMIN, PERMITS_DELETE, PERMITS_UPDATE, PERMITS_READ, MEMBER_OF, HAS_TAG |
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46 | } |
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47 | |
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48 | public static String ANNOTATION_URI_BASE = "http://entities.mpiwg-berlin.mpg.de/annotations/"; |
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49 | |
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50 | public AnnotationStore(GraphDatabaseService graphDb) { |
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51 | super(); |
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52 | this.graphDb = graphDb; |
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53 | nodeIndexes = new ArrayList<Index<Node>>(5); |
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54 | // List.set(enum.ordinal(), val) seems not to work. |
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55 | nodeIndexes.add(NodeTypes.ANNOTATION.ordinal(), graphDb.index().forNodes("annotations")); |
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56 | nodeIndexes.add(NodeTypes.PERSON.ordinal(), graphDb.index().forNodes("persons")); |
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57 | nodeIndexes.add(NodeTypes.TARGET.ordinal(), graphDb.index().forNodes("targets")); |
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58 | nodeIndexes.add(NodeTypes.GROUP.ordinal(), graphDb.index().forNodes("groups")); |
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59 | nodeIndexes.add(NodeTypes.TAG.ordinal(), graphDb.index().forNodes("tags")); |
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60 | } |
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61 | |
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62 | protected Index<Node> getNodeIndex(NodeTypes type) { |
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63 | return nodeIndexes.get(type.ordinal()); |
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64 | } |
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65 | |
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66 | /** |
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67 | * @param userUri |
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68 | * @return |
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69 | */ |
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70 | public Node getPersonNodeByUri(String userUri) { |
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71 | if (userUri == null) return null; |
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72 | Node person = getNodeIndex(NodeTypes.PERSON).get("uri", userUri).getSingle(); |
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73 | return person; |
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74 | } |
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75 | |
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76 | /** |
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77 | * Returns List of Groups. |
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78 | * |
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79 | * @param person |
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80 | * @return |
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81 | */ |
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82 | public List<Group> getGroups(String uriQuery) { |
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83 | ArrayList<Group> groups = new ArrayList<Group>(); |
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84 | Index<Node> idx = getNodeIndex(NodeTypes.GROUP); |
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85 | if (uriQuery == null) uriQuery = "*"; |
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86 | IndexHits<Node> groupNodes = idx.get("uri", uriQuery); |
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87 | for (Node groupNode : groupNodes) { |
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88 | Actor group = createActorFromNode(groupNode); |
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89 | groups.add((Group) group); |
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90 | } |
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91 | return groups; |
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92 | } |
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93 | |
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94 | /** |
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95 | * Returns List of Groups the person is member of. |
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96 | * |
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97 | * @param person |
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98 | * @return |
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99 | */ |
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100 | public List<Group> getGroupsForPersonNode(Node person) { |
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101 | ArrayList<Group> groups = new ArrayList<Group>(); |
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102 | Iterable<Relationship> rels = person.getRelationships(RelationTypes.MEMBER_OF); |
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103 | for (Relationship rel : rels) { |
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104 | Node groupNode = rel.getEndNode(); |
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105 | Actor group = createActorFromNode(groupNode); |
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106 | // make sure we're getting a group |
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107 | if (!(group instanceof Group)) { |
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108 | logger.error("target of MEMBER_OF is not GROUP! rel=" + rel); |
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109 | continue; |
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110 | } |
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111 | groups.add((Group) group); |
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112 | } |
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113 | return groups; |
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114 | } |
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115 | |
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116 | /** |
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117 | * Returns if person with uri is in Group group. |
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118 | * |
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119 | * @param person |
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120 | * @param group |
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121 | * @return |
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122 | */ |
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123 | public boolean isPersonInGroup(Person person, Group group) { |
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124 | Node pn = getPersonNodeByUri(person.getUriString()); |
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125 | if (pn == null) return false; |
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126 | // optimized version of getGroupsForPersonNode |
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127 | Iterable<Relationship> rels = pn.getRelationships(RelationTypes.MEMBER_OF); |
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128 | for (Relationship rel : rels) { |
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129 | Node gn = rel.getEndNode(); |
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130 | if (gn.getProperty("uri", "").equals(group.getUriString()) || gn.getProperty("id", "").equals(group.getId())) { |
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131 | return true; |
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132 | } |
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133 | } |
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134 | return false; |
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135 | } |
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136 | |
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137 | /** |
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138 | * Returns the Annotation with the given id. |
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139 | * |
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140 | * @param id |
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141 | * @return |
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142 | */ |
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143 | public Annotation getAnnotationById(String id) { |
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144 | Node annotNode = getNodeIndex(NodeTypes.ANNOTATION).get("id", id).getSingle(); |
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145 | Annotation annot = createAnnotationFromNode(annotNode); |
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146 | return annot; |
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147 | } |
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148 | |
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149 | /** |
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150 | * Returns an Annotation object from an annotation-Node. |
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151 | * |
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152 | * @param annotNode |
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153 | * @return |
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154 | */ |
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155 | public Annotation createAnnotationFromNode(Node annotNode) { |
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156 | Annotation annot = new Annotation(); |
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157 | annot.setUri((String) annotNode.getProperty("id", null)); |
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158 | annot.setBodyText((String) annotNode.getProperty("bodyText", null)); |
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159 | annot.setBodyUri((String) annotNode.getProperty("bodyUri", null)); |
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160 | /* |
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161 | * get annotation target from relation |
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162 | */ |
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163 | Relationship targetRel = getRelation(annotNode, RelationTypes.ANNOTATES, null); |
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164 | if (targetRel != null) { |
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165 | Node target = targetRel.getEndNode(); |
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166 | annot.setTargetBaseUri((String) target.getProperty("uri", null)); |
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167 | } else { |
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168 | logger.error("annotation " + annotNode + " has no target node!"); |
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169 | } |
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170 | annot.setTargetFragment((String) annotNode.getProperty("targetFragment", null)); |
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171 | String ft = (String) annotNode.getProperty("fragmentType", null); |
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172 | if (ft != null) { |
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173 | annot.setFragmentType(FragmentTypes.valueOf(ft)); |
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174 | } |
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175 | /* |
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176 | * get creator from relation |
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177 | */ |
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178 | Relationship creatorRel = getRelation(annotNode, RelationTypes.CREATED, null); |
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179 | if (creatorRel != null) { |
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180 | Node creatorNode = creatorRel.getStartNode(); |
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181 | Actor creator = createActorFromNode(creatorNode); |
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182 | annot.setCreator(creator); |
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183 | } else { |
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184 | logger.error("annotation " + annotNode + " has no creator node!"); |
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185 | } |
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186 | /* |
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187 | * get creation date |
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188 | */ |
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189 | annot.setCreated((String) annotNode.getProperty("created", null)); |
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190 | /* |
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191 | * get permissions |
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192 | */ |
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193 | Relationship adminRel = getRelation(annotNode, RelationTypes.PERMITS_ADMIN, null); |
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194 | if (adminRel != null) { |
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195 | Node adminNode = adminRel.getEndNode(); |
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196 | Actor admin = createActorFromNode(adminNode); |
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197 | annot.setAdminPermission(admin); |
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198 | } |
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199 | Relationship deleteRel = getRelation(annotNode, RelationTypes.PERMITS_DELETE, null); |
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200 | if (deleteRel != null) { |
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201 | Node deleteNode = deleteRel.getEndNode(); |
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202 | Actor delete = createActorFromNode(deleteNode); |
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203 | annot.setDeletePermission(delete); |
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204 | } |
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205 | Relationship updateRel = getRelation(annotNode, RelationTypes.PERMITS_UPDATE, null); |
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206 | if (updateRel != null) { |
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207 | Node updateNode = updateRel.getEndNode(); |
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208 | Actor update = createActorFromNode(updateNode); |
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209 | annot.setUpdatePermission(update); |
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210 | } |
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211 | Relationship readRel = getRelation(annotNode, RelationTypes.PERMITS_READ, null); |
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212 | if (readRel != null) { |
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213 | Node readNode = readRel.getEndNode(); |
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214 | Actor read = createActorFromNode(readNode); |
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215 | annot.setReadPermission(read); |
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216 | } |
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217 | /* |
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218 | * get tags |
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219 | */ |
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220 | Set<String> tags = new HashSet<String>(); |
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221 | for (Relationship rel : annotNode.getRelationships(RelationTypes.HAS_TAG)) { |
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222 | String tag = (String) rel.getEndNode().getProperty("name", null); |
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223 | if (tag != null) { |
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224 | tags.add(tag); |
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225 | } |
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226 | } |
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227 | annot.setTags(tags); |
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228 | |
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229 | return annot; |
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230 | } |
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231 | |
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232 | /** |
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233 | * Returns an Actor object from a node. |
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234 | * |
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235 | * @param actorNode |
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236 | * @return |
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237 | */ |
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238 | protected Actor createActorFromNode(Node actorNode) { |
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239 | String id = (String) actorNode.getProperty("id", null); |
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240 | String uri = (String) actorNode.getProperty("uri", null); |
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241 | String name = (String) actorNode.getProperty("name", null); |
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242 | String type = (String) actorNode.getProperty("TYPE", null); |
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243 | if (type != null && type.equals("PERSON")) { |
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244 | return new Person(id, uri, name); |
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245 | } else if (type != null && type.equals("GROUP")) { |
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246 | return new Group(id, uri, name); |
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247 | } |
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248 | return null; |
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249 | } |
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250 | |
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251 | /** |
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252 | * Store a new annotation in the store or update an existing one. Returns |
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253 | * the stored annotation. |
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254 | * |
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255 | * @param annot |
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256 | * @return |
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257 | */ |
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258 | public Annotation storeAnnotation(Annotation annot) { |
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259 | Node annotNode = null; |
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260 | Transaction tx = graphDb.beginTx(); |
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261 | try { |
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262 | /* |
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263 | * create or get the annotation |
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264 | */ |
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265 | String id = annot.getUri(); |
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266 | if (id == null) { |
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267 | id = createRessourceURI("annot:"); |
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268 | } |
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269 | annotNode = getOrCreateAnnotationNode(id); |
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270 | |
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271 | /* |
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272 | * the annotation body |
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273 | */ |
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274 | String bodyText = annot.getBodyText(); |
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275 | if (bodyText != null) { |
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276 | annotNode.setProperty("bodyText", bodyText); |
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277 | } |
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278 | String bodyUri = annot.getBodyUri(); |
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279 | if (bodyUri != null) { |
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280 | annotNode.setProperty("bodyUri", bodyUri); |
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281 | } |
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282 | |
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283 | /* |
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284 | * the annotation target |
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285 | */ |
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286 | String targetBaseUri = annot.getTargetBaseUri(); |
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287 | if (targetBaseUri != null) { |
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288 | Node target = getOrCreateTargetNode(targetBaseUri); |
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289 | getOrCreateRelation(annotNode, RelationTypes.ANNOTATES, target); |
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290 | } |
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291 | |
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292 | /* |
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293 | * The fragment part of the annotation target. |
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294 | */ |
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295 | String targetFragment = annot.getTargetFragment(); |
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296 | FragmentTypes fragmentType = annot.getFragmentType(); |
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297 | if (targetFragment != null) { |
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298 | annotNode.setProperty("targetFragment", targetFragment); |
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299 | annotNode.setProperty("fragmentType", fragmentType.name()); |
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300 | } |
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301 | |
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302 | /* |
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303 | * The creator of this annotation. |
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304 | */ |
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305 | Actor creator = annot.getCreator(); |
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306 | if (creator != null) { |
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307 | Node creatorNode = getOrCreateActorNode(creator); |
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308 | getOrCreateRelation(creatorNode, RelationTypes.CREATED, annotNode); |
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309 | } |
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310 | |
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311 | /* |
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312 | * The creation date of this annotation. |
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313 | */ |
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314 | String created = annot.getCreated(); |
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315 | if (created != null) { |
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316 | annotNode.setProperty("created", created); |
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317 | } |
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318 | |
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319 | /* |
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320 | * Permissions for this annotation. |
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321 | */ |
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322 | setPermissionRelation(annotNode, RelationTypes.PERMITS_ADMIN, annot.getAdminPermission()); |
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323 | setPermissionRelation(annotNode, RelationTypes.PERMITS_DELETE, annot.getDeletePermission()); |
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324 | setPermissionRelation(annotNode, RelationTypes.PERMITS_UPDATE, annot.getUpdatePermission()); |
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325 | setPermissionRelation(annotNode, RelationTypes.PERMITS_READ, annot.getReadPermission()); |
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326 | |
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327 | /* |
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328 | * Tags on this annotation. |
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329 | */ |
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330 | Set<String> newTags = annot.getTags(); |
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331 | // we ignore existing tags if tags == null |
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332 | if (newTags != null) { |
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333 | List<Relationship> oldHasTags = new ArrayList<Relationship>(); |
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334 | for (Relationship rel : annotNode.getRelationships(RelationTypes.HAS_TAG)) { |
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335 | oldHasTags.add(rel); |
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336 | } |
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337 | // adjust to new tags |
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338 | if (newTags.isEmpty()) { |
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339 | // remove old tags |
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340 | if (!oldHasTags.isEmpty()) { |
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341 | for (Relationship rel : oldHasTags) { |
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342 | rel.delete(); |
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343 | // TODO: should we delete orphan nodes too? |
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344 | } |
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345 | } |
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346 | } else { |
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347 | if (!oldHasTags.isEmpty()) { |
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348 | // adjust old tags |
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349 | for (Relationship rel : oldHasTags) { |
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350 | String oldTag = (String) rel.getEndNode().getProperty("name", null); |
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351 | if (newTags.contains(oldTag)) { |
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352 | // tag exists |
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353 | newTags.remove(oldTag); |
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354 | } else { |
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355 | // tag exists no longer |
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356 | rel.delete(); |
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357 | // TODO: should we delete orphan nodes too? |
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358 | } |
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359 | } |
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360 | } |
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361 | if (!newTags.isEmpty()) { |
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362 | // still tags to add |
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363 | for (String tag : newTags) { |
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364 | // create new tag |
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365 | Node tagNode = getOrCreateTagNode(tag); |
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366 | getOrCreateRelation(annotNode, RelationTypes.HAS_TAG, tagNode); |
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367 | } |
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368 | } |
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369 | |
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370 | } |
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371 | } |
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372 | tx.success(); |
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373 | } finally { |
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374 | tx.finish(); |
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375 | } |
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376 | |
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377 | // re-read and return annotation |
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378 | Annotation storedAnnot = createAnnotationFromNode(annotNode); |
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379 | return storedAnnot; |
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380 | } |
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381 | |
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382 | /** |
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383 | * Deletes the annotation with the given id. |
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384 | * |
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385 | * @param id |
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386 | */ |
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387 | public void deleteById(String id) { |
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388 | Node annotNode = getNodeIndex(NodeTypes.ANNOTATION).get("id", id).getSingle(); |
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389 | if (annotNode != null) { |
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390 | // delete related objects |
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391 | Transaction tx = graphDb.beginTx(); |
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392 | try { |
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393 | for (Relationship rel : annotNode.getRelationships()) { |
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394 | // delete relation and the related node if it has no other |
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395 | // relations |
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396 | Node other = rel.getOtherNode(annotNode); |
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397 | rel.delete(); |
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398 | if (!other.hasRelationship()) { |
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399 | deleteNode(other); |
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400 | } |
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401 | } |
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402 | if (!annotNode.hasRelationship()) { |
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403 | deleteNode(annotNode); |
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404 | } else { |
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405 | logger.error("deleteById: unable to delete: Node still has relations."); |
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406 | } |
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407 | tx.success(); |
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408 | } finally { |
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409 | tx.finish(); |
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410 | } |
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411 | } |
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412 | } |
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413 | |
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414 | /** |
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415 | * Returns all annotations with the given uri and/or user. |
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416 | * |
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417 | * @param uri |
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418 | * @param userUri |
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419 | * @param limit |
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420 | * @param offset |
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421 | * @return |
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422 | */ |
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423 | public List<Annotation> searchByUriUser(String targetUri, String userUri, String limit, String offset) { |
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424 | List<Annotation> annotations = new ArrayList<Annotation>(); |
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425 | if (targetUri != null) { |
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426 | // there should be only one |
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427 | Node target = getNodeIndex(NodeTypes.TARGET).get("uri", targetUri).getSingle(); |
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428 | if (target != null) { |
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429 | Iterable<Relationship> relations = target.getRelationships(RelationTypes.ANNOTATES); |
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430 | for (Relationship relation : relations) { |
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431 | Node ann = relation.getStartNode(); |
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432 | if (ann.getProperty("TYPE", "").equals("ANNOTATION")) { |
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433 | Annotation annot = createAnnotationFromNode(ann); |
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434 | annotations.add(annot); |
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435 | } else { |
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436 | logger.error("ANNOTATES relation does not start with ANNOTATION: " + ann); |
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437 | } |
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438 | } |
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439 | } |
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440 | } |
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441 | if (userUri != null) { |
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442 | // there should be only one |
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443 | Node person = getPersonNodeByUri(userUri); |
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444 | if (person != null) { |
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445 | Iterable<Relationship> relations = person.getRelationships(RelationTypes.CREATED); |
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446 | for (Relationship relation : relations) { |
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447 | Node ann = relation.getEndNode(); |
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448 | if (ann.getProperty("TYPE", "").equals("ANNOTATION")) { |
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449 | Annotation annot = createAnnotationFromNode(ann); |
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450 | annotations.add(annot); |
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451 | } else { |
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452 | logger.error("CREATED relation does not end with ANNOTATION: " + ann); |
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453 | } |
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454 | } |
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455 | } |
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456 | } |
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457 | // TODO: if both uri and user are given we should intersect |
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458 | return annotations; |
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459 | } |
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460 | |
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461 | /** |
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462 | * Returns Relationship of type from Node start to Node end. Creates one if |
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463 | * it doesn't exist. |
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464 | * |
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465 | * @param start |
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466 | * @param type |
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467 | * @param end |
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468 | * @return |
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469 | */ |
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470 | protected Relationship getOrCreateRelation(Node start, RelationshipType type, Node end) { |
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471 | if (start.hasRelationship()) { |
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472 | // there are relations |
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473 | Iterable<Relationship> rels = start.getRelationships(type, Direction.OUTGOING); |
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474 | for (Relationship rel : rels) { |
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475 | if (rel.getEndNode().equals(end)) { |
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476 | // relation exists |
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477 | return rel; |
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478 | } |
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479 | } |
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480 | } |
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481 | // create new one |
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482 | Relationship rel; |
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483 | Transaction tx = graphDb.beginTx(); |
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484 | try { |
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485 | rel = start.createRelationshipTo(end, type); |
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486 | tx.success(); |
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487 | } finally { |
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488 | tx.finish(); |
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489 | } |
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490 | return rel; |
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491 | } |
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492 | |
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493 | protected Node getOrCreateAnnotationNode(String id) { |
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494 | Index<Node> idx = getNodeIndex(NodeTypes.ANNOTATION); |
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495 | IndexHits<Node> annotations = idx.get("id", id); |
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496 | Node annotation = annotations.getSingle(); |
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497 | if (annotation == null) { |
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498 | // does not exist yet |
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499 | Transaction tx = graphDb.beginTx(); |
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500 | try { |
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501 | annotation = graphDb.createNode(); |
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502 | annotation.setProperty("TYPE", NodeTypes.ANNOTATION.name()); |
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503 | annotation.setProperty("id", id); |
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504 | idx.add(annotation, "id", id); |
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505 | tx.success(); |
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506 | } finally { |
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507 | tx.finish(); |
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508 | } |
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509 | } |
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510 | return annotation; |
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511 | } |
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512 | |
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513 | protected Node getOrCreateTargetNode(String uri) { |
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514 | Index<Node> idx = getNodeIndex(NodeTypes.TARGET); |
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515 | IndexHits<Node> targets = idx.get("uri", uri); |
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516 | Node target = targets.getSingle(); |
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517 | if (target == null) { |
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518 | // does not exist yet |
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519 | Transaction tx = graphDb.beginTx(); |
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520 | try { |
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521 | target = graphDb.createNode(); |
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522 | target.setProperty("TYPE", NodeTypes.TARGET.name()); |
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523 | target.setProperty("uri", uri); |
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524 | idx.add(target, "uri", uri); |
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525 | tx.success(); |
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526 | } finally { |
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527 | tx.finish(); |
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528 | } |
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529 | } |
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530 | return target; |
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531 | } |
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532 | |
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533 | protected Node getOrCreateActorNode(Actor actor) { |
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534 | // Person/Group is identified by URI or id |
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535 | String uri = actor.getUriString(); |
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536 | String name = actor.getName(); |
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537 | String id = actor.getId(); |
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538 | Index<Node> idx; |
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539 | if (actor.isGroup()) { |
---|
540 | idx = getNodeIndex(NodeTypes.GROUP); |
---|
541 | } else { |
---|
542 | idx = getNodeIndex(NodeTypes.PERSON); |
---|
543 | } |
---|
544 | IndexHits<Node> persons = idx.get("uri", uri); |
---|
545 | Node person = persons.getSingle(); |
---|
546 | if (person == null) { |
---|
547 | // does not exist yet |
---|
548 | Transaction tx = graphDb.beginTx(); |
---|
549 | try { |
---|
550 | person = graphDb.createNode(); |
---|
551 | if (actor.isGroup()) { |
---|
552 | person.setProperty("TYPE", NodeTypes.GROUP.name()); |
---|
553 | } else { |
---|
554 | person.setProperty("TYPE", NodeTypes.PERSON.name()); |
---|
555 | } |
---|
556 | person.setProperty("uri", uri); |
---|
557 | idx.add(person, "uri", uri); |
---|
558 | if (name != null) { |
---|
559 | person.setProperty("name", name); |
---|
560 | } |
---|
561 | if (id != null) { |
---|
562 | person.setProperty("id", id); |
---|
563 | } |
---|
564 | tx.success(); |
---|
565 | } finally { |
---|
566 | tx.finish(); |
---|
567 | } |
---|
568 | } |
---|
569 | return person; |
---|
570 | } |
---|
571 | |
---|
572 | protected Node getOrCreateTagNode(String tagname) { |
---|
573 | Index<Node> idx = getNodeIndex(NodeTypes.TAG); |
---|
574 | IndexHits<Node> tags = idx.get("name", tagname); |
---|
575 | Node tag = tags.getSingle(); |
---|
576 | if (tag == null) { |
---|
577 | // does not exist yet |
---|
578 | Transaction tx = graphDb.beginTx(); |
---|
579 | try { |
---|
580 | tag = graphDb.createNode(); |
---|
581 | tag.setProperty("TYPE", NodeTypes.TAG.name()); |
---|
582 | tag.setProperty("name", tagname); |
---|
583 | idx.add(tag, "name", tagname); |
---|
584 | tx.success(); |
---|
585 | } finally { |
---|
586 | tx.finish(); |
---|
587 | } |
---|
588 | } |
---|
589 | return tag; |
---|
590 | } |
---|
591 | |
---|
592 | /** |
---|
593 | * Create or update permissions relations for an annotation. |
---|
594 | * |
---|
595 | * @param annotNode |
---|
596 | * @param type |
---|
597 | * @param annot |
---|
598 | */ |
---|
599 | protected void setPermissionRelation(Node annotNode, RelationTypes type, Actor actor) { |
---|
600 | Node newActorNode = null; |
---|
601 | if (actor != null) { |
---|
602 | newActorNode = getOrCreateActorNode(actor); |
---|
603 | } |
---|
604 | Relationship rel = getRelation(annotNode, type, null); |
---|
605 | if (rel != null) { |
---|
606 | // relation exists |
---|
607 | Node oldActorNode = rel.getEndNode(); |
---|
608 | if (!oldActorNode.equals(newActorNode)) { |
---|
609 | // new admin is different |
---|
610 | rel.delete(); |
---|
611 | if (newActorNode != null) { |
---|
612 | rel = getOrCreateRelation(annotNode, type, newActorNode); |
---|
613 | } |
---|
614 | } |
---|
615 | } else { |
---|
616 | // no relation yet |
---|
617 | if (newActorNode != null) { |
---|
618 | rel = getOrCreateRelation(annotNode, type, newActorNode); |
---|
619 | } |
---|
620 | } |
---|
621 | } |
---|
622 | |
---|
623 | /** |
---|
624 | * Unindexes and deletes given Node if it has no relations. |
---|
625 | * |
---|
626 | * @param node |
---|
627 | */ |
---|
628 | protected void deleteNode(Node node) { |
---|
629 | Transaction tx = graphDb.beginTx(); |
---|
630 | try { |
---|
631 | if (node.hasRelationship()) { |
---|
632 | logger.error("deleteNode: unable to delete: Node still has relations."); |
---|
633 | } else { |
---|
634 | String ts = (String) node.getProperty("TYPE", null); |
---|
635 | try { |
---|
636 | NodeTypes type = NodeTypes.valueOf(ts); |
---|
637 | getNodeIndex(type).remove(node); |
---|
638 | } catch (Exception e) { |
---|
639 | logger.error("deleteNode: unable to get TYPE of node: " + node); |
---|
640 | } |
---|
641 | node.delete(); |
---|
642 | } |
---|
643 | tx.success(); |
---|
644 | } finally { |
---|
645 | tx.finish(); |
---|
646 | } |
---|
647 | } |
---|
648 | |
---|
649 | /** |
---|
650 | * returns the (first) Relationship of RelationTypes type from Node start. |
---|
651 | * |
---|
652 | * @param start |
---|
653 | * @param type |
---|
654 | * @param direction |
---|
655 | * @return |
---|
656 | */ |
---|
657 | protected Relationship getRelation(Node start, RelationTypes type, Direction direction) { |
---|
658 | Iterable<Relationship> rels; |
---|
659 | if (direction == null) { |
---|
660 | // ignore direction |
---|
661 | rels = start.getRelationships(type); |
---|
662 | } else { |
---|
663 | rels = start.getRelationships(type, direction); |
---|
664 | } |
---|
665 | for (Relationship rel : rels) { |
---|
666 | // just the first one |
---|
667 | return rel; |
---|
668 | } |
---|
669 | return null; |
---|
670 | } |
---|
671 | |
---|
672 | /** |
---|
673 | * Erzeuge eine urn aus der aktuellen Zeit in millis |
---|
674 | * |
---|
675 | * @return |
---|
676 | */ |
---|
677 | private String createRessourceURI(String prefix) { |
---|
678 | |
---|
679 | Calendar cal = Calendar.getInstance(); |
---|
680 | |
---|
681 | long time = cal.getTimeInMillis(); |
---|
682 | |
---|
683 | return String.format("%s%s%s", ANNOTATION_URI_BASE, prefix, time); |
---|
684 | |
---|
685 | } |
---|
686 | |
---|
687 | } |
---|