gerrit.simantics Code Review - simantics/platform.git/blob

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