Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.modeling / src / org / simantics / modeling / scl / GraphPropertyRelation.java

diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/scl/GraphPropertyRelation.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/scl/GraphPropertyRelation.java
new file mode 100644 (file)
index 0000000..45ac24f
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/scl/GraphPropertyRelation.java
@@ -0,0 +1,111 @@
+package org.simantics.modeling.scl;\r
+\r
+import org.simantics.db.Resource;\r
+import org.simantics.scl.compiler.common.names.Name;\r
+import org.simantics.scl.compiler.elaboration.expressions.EApply;\r
+import org.simantics.scl.compiler.elaboration.expressions.EExternalConstant;\r
+import org.simantics.scl.compiler.elaboration.expressions.EVariable;\r
+import org.simantics.scl.compiler.elaboration.expressions.Expression;\r
+import org.simantics.scl.compiler.elaboration.expressions.Variable;\r
+import org.simantics.scl.compiler.elaboration.query.compilation.EnforcingContext;\r
+import org.simantics.scl.compiler.elaboration.query.compilation.QueryCompilationContext;\r
+import org.simantics.scl.compiler.elaboration.relations.SCLRelation;\r
+import org.simantics.scl.compiler.errors.Locations;\r
+import org.simantics.scl.compiler.types.TVar;\r
+import org.simantics.scl.compiler.types.Type;\r
+import org.simantics.scl.compiler.types.Types;\r
+\r
+public class GraphPropertyRelation implements SCLRelation {\r
+\r
+    Resource propertyRelation;\r
+    Type valueType;\r
+    Type[] parameterTypes;\r
+\r
+    private static final Type RESOURCE = Types.con("Simantics/DB", "Resource");\r
+    \r
+    public GraphPropertyRelation(Resource propertyRelation, Type valueType) {\r
+        this.propertyRelation = propertyRelation;\r
+        this.valueType = valueType;\r
+        this.parameterTypes = new Type[] { RESOURCE, valueType };\r
+    }\r
+\r
+    @Override\r
+    public TVar[] getTypeVariables() {\r
+        return TVar.EMPTY_ARRAY;\r
+    }\r
+    \r
+    @Override\r
+    public Type[] getParameterTypes() {\r
+        return parameterTypes;\r
+    }\r
+\r
+    @Override\r
+    public double getSelectivity(int boundVariables) {\r
+        switch(boundVariables) {\r
+        case FF:\r
+        case FB: return Double.POSITIVE_INFINITY;\r
+        case BF: return 1.0;\r
+        case BB: return 0.01;\r
+        default: throw new IllegalArgumentException();\r
+        }\r
+    }\r
+    \r
+    @Override\r
+    public int getRequiredVariablesMask() {\r
+        return BF;\r
+    }\r
+    \r
+    private static final Name POSSIBLE_RELATED_VALUE = Name.create("Simantics/DB", "possibleRelatedValue");\r
+    \r
+    @Override\r
+    public void generate(long location, QueryCompilationContext context,\r
+            Type[] typeParameters, Variable[] parameters, int boundVariables) {\r
+        Expression possibleValue = new EApply(\r
+                Locations.NO_LOCATION,\r
+                Types.READ_GRAPH,\r
+                context.getTypingContext().getConstant(POSSIBLE_RELATED_VALUE, valueType),\r
+                context.getEvidence(location, Types.pred(Types.SERIALIZABLE, valueType)),\r
+                new EVariable(parameters[0]),\r
+                new EExternalConstant(propertyRelation, RESOURCE)\r
+                );\r
+        switch(boundVariables) {\r
+        case BB: {\r
+            Variable temp = new Variable("temp", valueType);\r
+            context.condition(new EApply(\r
+                    context.getTypingContext().getConstant(Name.create("Prelude", "=="), valueType),\r
+                    new Expression[] {\r
+                        context.getEvidence(location, Types.pred(Types.EQ, valueType)),\r
+                        new EVariable(temp),\r
+                        new EVariable(parameters[1])\r
+                    }\r
+                    ));\r
+            context.iterateMaybe(temp, possibleValue);\r
+        } break;\r
+        case BF: context.iterateMaybe(parameters[1], possibleValue);\r
+        break;\r
+        default: throw new IllegalArgumentException();\r
+        }\r
+    }\r
+\r
+    private static final Name CLAIM_RELATED_VALUE = Name.create("Simantics/DB", "claimRelatedValue");\r
+    \r
+    @Override\r
+    public Expression generateEnforce(long location, EnforcingContext context,\r
+            Type[] typeParameters, Variable[] parameters) {\r
+        return new EApply(\r
+                Locations.NO_LOCATION,\r
+                Types.WRITE_GRAPH,\r
+                context.getTypingContext().getConstant(CLAIM_RELATED_VALUE, valueType),\r
+                context.getEvidence(location, Types.pred(Types.SERIALIZABLE, valueType)),\r
+                new EVariable(parameters[0]),\r
+                new EExternalConstant(propertyRelation, RESOURCE),\r
+                new EVariable(parameters[1])\r
+                );\r
+    }\r
+\r
+    @Override\r
+    public int getPhase() {\r
+        return 0;\r
+    }\r
+    \r
+}\r