org.simantics.district.network/src/org/simantics/district/network/changeset/DistrictChangeListener.java

   1 package org.simantics.district.network.changeset;
   2
   3 import java.util.Map;
   4
   5 import org.simantics.db.MetadataI;
   6 import org.simantics.db.ReadGraph;
   7 import org.simantics.db.Resource;
   8 import org.simantics.db.common.changeset.GenericChangeListener;
   9 import org.simantics.db.exception.DatabaseException;
  10 import org.simantics.db.layer0.genericrelation.DependenciesRelation.DependencyChangesRequest;
  11 import org.simantics.db.layer0.genericrelation.DependencyChanges;
  12 import org.simantics.db.layer0.genericrelation.DependencyChanges.Change;
  13 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentAddition;
  14 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentModification;
  15 import org.simantics.db.layer0.genericrelation.DependencyChanges.ComponentRemoval;
  16 import org.simantics.db.layer0.genericrelation.DependencyChanges.LinkChange;
  17 import org.simantics.district.network.DistrictNetworkUtil;
  18 import org.simantics.district.network.ontology.DistrictNetworkResource;
  19 import org.simantics.layer0.Layer0;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 public class DistrictChangeListener extends GenericChangeListener<DependencyChangesRequest, DependencyChanges> {
  24
  25     @SuppressWarnings("unused")
  26         private static final Logger LOGGER = LoggerFactory.getLogger(DistrictChangeListener.class);
  27
  28     @Override
  29     public void onEvent(ReadGraph graph, MetadataI metadata, DependencyChanges event) throws DatabaseException {
  30         for (Map.Entry<Resource, Change[]> modelEntry : event.get().entrySet()) {
  31
  32             final Resource model = modelEntry.getKey();
  33             final Change[] changes = modelEntry.getValue();
  34             for (Change _entry : changes) {
  35                 if (_entry instanceof ComponentAddition) {
  36                     ComponentAddition entry = (ComponentAddition) _entry;
  37                     if (areWeInterested(graph, entry.component, entry.parent)) {
  38                         elementAddition(graph, entry.component);
  39                     }
  40                 } else if (_entry instanceof ComponentModification) {
  41                     ComponentModification entry = (ComponentModification) _entry;
  42                     if (areWeInterested(graph, entry.component, graph.getPossibleObject(entry.component, Layer0.getInstance(graph).PartOf))) {
  43                         elementModification(graph, entry.component);
  44                     }
  45                 } else if (_entry instanceof ComponentRemoval) {
  46                     ComponentRemoval entry = (ComponentRemoval) _entry;
  47                     elementRemoved(graph, entry.component);
  48                 } else if (_entry instanceof LinkChange) {
  49                     // This can be ignored?
  50                 }
  51             }
  52
  53             changesInspected(graph, model);
  54         }
  55     }
  56
  57     private static boolean areWeInterested(ReadGraph graph, Resource component, Resource parent) throws DatabaseException {
  58         DistrictNetworkResource DN = DistrictNetworkResource.getInstance(graph);
  59         Boolean trackChangesEnabled = false;
  60         if (parent != null) {
  61             if (graph.isInstanceOf(parent, DN.Diagram)) {
  62                 trackChangesEnabled = DistrictNetworkUtil.trackChangesEnabled(graph, parent);
  63             }
  64         }
  65         if (trackChangesEnabled) {
  66             if (graph.isInstanceOf(component, DN.Edge) || graph.isInstanceOf(component, DN.Vertex)) {
  67                 return true;
  68             }
  69         }
  70         return false;
  71     }
  72
  73     protected void elementAddition(ReadGraph graph, Resource element) throws DatabaseException {
  74     }
  75
  76     protected void elementModification(ReadGraph graph, Resource element) throws DatabaseException {
  77     }
  78
  79     protected void elementRemoved(ReadGraph graph, Resource element) throws DatabaseException {
  80     }
  81
  82     protected void changesInspected(ReadGraph graph, Resource model) throws DatabaseException {
  83     }
  84 }