bundles/org.simantics.db.common/src/org/simantics/db/common/request/AdaptValue.java

   1 package org.simantics.db.common.request;
   2
   3 import org.simantics.db.ReadGraph;
   4 import org.simantics.db.Resource;
   5 import org.simantics.db.common.utils.Functions;
   6 import org.simantics.db.exception.DatabaseException;
   7 import org.simantics.db.exception.RuntimeDatabaseException;
   8 import org.simantics.layer0.Layer0;
   9 import org.simantics.scl.reflection.ReflectionUtils;
  10 import org.simantics.scl.reflection.ValueNotFoundException;
  11 import org.simantics.scl.runtime.function.FunctionImpl3;
  12
  13 /**
  14  * Adapts a resource to (SCL) value.
  15  * @author Hannu Niemist&ouml;
  16  */
  17 public class AdaptValue extends ResourceRead<Object> {
  18
  19     public AdaptValue(Resource resource) {
  20         super(resource);
  21     }
  22
  23     private static final FunctionImpl3<ReadGraph,Resource,Object,Object> functionApplication = new FunctionImpl3<ReadGraph,Resource,Object,Object>() {
  24
  25                 @Override
  26                 public Object apply(ReadGraph graph, Resource resource, Object context) {
  27                         try {
  28                                 return Functions.exec(graph, resource, graph, resource, context);
  29                         } catch (DatabaseException e) {
  30                                 throw new RuntimeDatabaseException(e);
  31                         }
  32                 }
  33
  34         };
  35
  36     @Override
  37     public Object perform(ReadGraph graph) throws DatabaseException {
  38         String uri = graph.getURI(resource);
  39         try {
  40                         if(Layer0.URIs.Functions_functionApplication.equals(uri)) return functionApplication;
  41             return ReflectionUtils.getValue(uri).getValue();
  42         } catch (ValueNotFoundException e) {
  43             throw new DatabaseException("Couldn't adapt the value " + uri, e);
  44         }
  45     }
  46
  47 }