bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/SCLChildRule.java

   1 package org.simantics.modeling.adapters;
   2
   3 import java.util.Collection;
   4 import java.util.Collections;
   5 import java.util.List;
   6
   7 import org.simantics.browsing.ui.model.children.ChildRule;
   8 import org.simantics.db.ReadGraph;
   9 import org.simantics.db.Resource;
  10 import org.simantics.db.exception.DatabaseException;
  11 import org.simantics.db.layer0.variable.Variable;
  12 import org.simantics.db.layer0.variable.Variables;
  13 import org.simantics.modeling.ModelingResources;
  14 import org.simantics.scl.runtime.SCLContext;
  15 import org.simantics.scl.runtime.function.Function1;
  16
  17 public class SCLChildRule implements ChildRule {
  18
  19     private Resource rule;
  20
  21     public SCLChildRule(ReadGraph graph, Resource rule) {
  22         this.rule = rule;
  23     }
  24
  25     @Override
  26     public boolean isCompatible(Class<?> contentType) {
  27         return contentType.equals(Resource.class) || contentType.equals(Variable.class);
  28     }
  29
  30     @Override
  31     public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
  32
  33         ModelingResources MOD = ModelingResources.getInstance(graph);
  34
  35         Variable ruleVariable = Variables.getVariable(graph, rule);
  36
  37         Function1<Object,List<?>> getChildren = ruleVariable.getPossiblePropertyValue(graph, MOD.SCLChildRule_getChildren);
  38         if(getChildren == null) return Collections.emptyList();
  39
  40         SCLContext sclContext = SCLContext.getCurrent();
  41         Object oldGraph = sclContext.get("graph");
  42         try {
  43             sclContext.put("graph", graph);
  44             Object value = getChildren.apply(parent);
  45             return (Collection<?>)value;
  46         } catch (Throwable t) {
  47                 throw new DatabaseException(t);
  48         } finally {
  49             sclContext.put("graph", oldGraph);
  50         }
  51
  52     }
  53
  54     @Override
  55     public Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException {
  56         return null;
  57     }
  58
  59 }