bundles/org.simantics.structural2/src/org/simantics/structural2/scl/CompileStructuralValueRequest.java

   1 package org.simantics.structural2.scl;
   2
   3 import org.simantics.databoard.Bindings;
   4 import org.simantics.db.ReadGraph;
   5 import org.simantics.db.Resource;
   6 import org.simantics.db.common.procedure.adapter.TransientCacheListener;
   7 import org.simantics.db.common.request.IndexRoot;
   8 import org.simantics.db.exception.DatabaseException;
   9 import org.simantics.db.layer0.variable.Variable;
  10 import org.simantics.layer0.Layer0;
  11 import org.simantics.scl.runtime.SCLContext;
  12 import org.simantics.scl.runtime.function.Function1;
  13
  14 /**
  15  * Compiles an SCL expression that is attached to a literal
  16  * whose parent is a component that is a part of a component type.
  17  *
  18  * @author Hannu Niemist&ouml;
  19  */
  20 public class CompileStructuralValueRequest extends AbstractCompileStructuralValueRequest {
  21
  22     protected final Resource component;
  23     protected final Resource literal;
  24
  25     public CompileStructuralValueRequest(Resource component, Resource literal, Resource relation) {
  26         super(relation);
  27         this.component = component;
  28         this.literal = literal;
  29     }
  30
  31     public CompileStructuralValueRequest(ReadGraph graph, Variable context) throws DatabaseException {
  32         this(context.getParent(graph).getRepresents(graph),
  33                 context.getRepresents(graph),
  34                 context.getPredicateResource(graph));
  35     }
  36
  37     public static Object compileAndEvaluate(ReadGraph graph, Variable context) throws DatabaseException {
  38         SCLContext sclContext = SCLContext.getCurrent();
  39         Object oldGraph = sclContext.get("graph");
  40         CompileStructuralValueRequest request = new CompileStructuralValueRequest(graph, context);
  41         try {
  42             Function1<Variable,Object> exp = graph.syncRequest(request, TransientCacheListener.<Function1<Variable,Object>>instance());
  43             sclContext.put("graph", graph);
  44             return exp.apply(context);
  45         } catch (Throwable t) {
  46             throw new DatabaseException("Compiling structural value request for component=" + request.component + ", literal=" + request.literal + " and relation " + request.relation + " failed!", t);
  47         } finally {
  48             sclContext.put("graph", oldGraph);
  49         }
  50     }
  51
  52     @Override
  53     protected String getExpressionText(ReadGraph graph)
  54             throws DatabaseException {
  55         Layer0 L0 = Layer0.getInstance(graph);
  56         return graph.getRelatedValue(literal, L0.SCLValue_expression, Bindings.STRING);
  57     }
  58
  59     @Override
  60     protected Resource getIndexRoot(ReadGraph graph) throws DatabaseException {
  61         return graph.syncRequest(new IndexRoot(literal));
  62     }
  63
  64     @Override
  65     protected Resource getComponentType(ReadGraph graph)
  66                 throws DatabaseException {
  67         // This is possible e.g. for interface expressions inside procedurals
  68         if(component == null) return null;
  69         return graph.syncRequest(new FindPossibleComponentTypeRequest(component));
  70     }
  71
  72         @Override
  73         public int hashCode() {
  74                 final int prime = 31;
  75                 int result = 1;
  76                 result = prime * result + ((component == null) ? 0 : component.hashCode());
  77                 result = prime * result + ((literal == null) ? 0 : literal.hashCode());
  78                 return result;
  79         }
  80
  81         @Override
  82         public boolean equals(Object obj) {
  83                 if (this == obj)
  84                         return true;
  85                 if (obj == null)
  86                         return false;
  87                 if (getClass() != obj.getClass())
  88                         return false;
  89                 CompileStructuralValueRequest other = (CompileStructuralValueRequest) obj;
  90                 if (component == null) {
  91                         if (other.component != null)
  92                                 return false;
  93                 } else if (!component.equals(other.component))
  94                         return false;
  95                 if (literal == null) {
  96                         if (other.literal != null)
  97                                 return false;
  98                 } else if (!literal.equals(other.literal))
  99                         return false;
 100                 return true;
 101         }
 102
 103 }