Ejemplo n.º 1
0
 /**
  * Generates the relation field over the model sigs for called relations Must be run before the
  * relation constraint is created (otherwise recursive calls will fail)
  *
  * @return the Alloy field for this relation
  * @throws EchoError
  * @todo Support for n models
  */
 private Field addRelationFields() throws EchoError {
   Field field = null;
   Decl fst = rootvar2alloydecl.get(relation.getDomains().get(0).getRootVariable().getName());
   /*Decl snd = rootvar2alloydecl.get(relation.getDomains().get(1)
   .getVariable().getName());*/
   try {
     Sig s = (Sig) fst.expr.type().toExpr();
     for (Field f : s.getFields()) {
       if (f.label.equals(AlloyUtil.relationFieldName(relation, dependency.target))) field = f;
     }
     if (field == null) {
       field =
           s.addField(
               AlloyUtil.relationFieldName(relation, dependency.target),
               /*type.setOf()*/ Sig.UNIV.setOf());
     }
   } catch (Err a) {
     throw new ErrorAlloy(
         ErrorAlloy.FAIL_CREATE_FIELD,
         "Failed to create relation field representation: " + relation.getName(),
         a,
         Task.TRANSLATE_TRANSFORMATION);
   }
   return field;
 }
Ejemplo n.º 2
0
 /**
  * adds to the transformation translator the constraint defining the field of this sub relation
  *
  * @param fact the constraint defining this relation
  * @param field the field representing this sub relation
  * @throws EchoError
  */
 private void addRelationDef(Expr fact, Field field) throws EchoError {
   Decl fst = rootvar2alloydecl.get(relation.getDomains().get(0).getRootVariable().getName());
   Decl snd = rootvar2alloydecl.get(relation.getDomains().get(1).getRootVariable().getName());
   Func f;
   try {
     Expr e = field.equal(fact.comprehensionOver(fst, snd));
     f = new Func(null, field.label + "def", model_params_decls, null, e);
     transformation_translator.addSubRelationDef(f);
   } catch (Err a) {
     throw new ErrorAlloy(
         ErrorAlloy.FAIL_CREATE_FUNC,
         "Failed to create sub relation field constraint: " + relation.getName(),
         a,
         Task.TRANSLATE_TRANSFORMATION);
   }
 }
Ejemplo n.º 3
0
 /**
  * adds to the transformation translator the constraint defining this top relation
  *
  * @param fact the constraint defining this relation
  * @throws EchoError
  */
 private void addRelationPred(Expr fact) throws EchoError {
   try {
     transformation_translator.addTopRelationCall(
         new Func(
             null,
             AlloyUtil.relationPredName(relation, dependency.target),
             model_params_decls,
             null,
             fact));
   } catch (Err a) {
     throw new ErrorAlloy(
         ErrorAlloy.FAIL_CREATE_FUNC,
         "Failed to create top relation constraint function: " + relation.getName(),
         a,
         Task.TRANSLATE_TRANSFORMATION);
   }
 }
Ejemplo n.º 4
0
 /**
  * adds to the transformation translator the field representing this sub relation
  *
  * @throws EchoError
  */
 private Field addRelationField() throws EchoError {
   Field field = null;
   try {
     field = addRelationFields();
     transformation_translator.addSubRelationCall(
         new Func(
             null,
             AlloyUtil.relationFieldName(relation, dependency.target),
             model_params_decls,
             field.type().toExpr(),
             field));
   } catch (Err a) {
     throw new ErrorAlloy(
         ErrorAlloy.FAIL_CREATE_FUNC,
         "Failed to create sub relation constraint function: " + relation.getName(),
         a,
         Task.TRANSLATE_TRANSFORMATION);
   }
   return field;
 }
Ejemplo n.º 5
0
  /**
   * Calculates the Alloy constraint denoting the relation top test. Takes the shape "forall
   * whenvars : when => (forall sourcevars : sourcedomain => (exists targetvars+wherevars :
   * targetdomain && where))" Must be run after relation field is created (otherwise recursive calls
   * will fail)
   *
   * @return the Alloy constraint representing the relation
   * @throws EchoError
   */
  private Expr calculateFact() throws EchoError {

    Expr fact = Sig.NONE.no(),
        sourceexpr = Sig.NONE.no(),
        postexpr = Sig.NONE.no(),
        whenexpr = Sig.NONE.no();
    Decl[] arraydecl;

    ECondition postCondition = relation.getPost();
    ECondition targetCondition = targetdomain.getCondition();
    try {
      if (postCondition != null) {
        postCondition.initTranslation(parent_translator, var2varmodel(), modelparam2var, null);
        postexpr = (Expr) postCondition.translate();
      }

      targetCondition.initTranslation(parent_translator, var2varmodel(), modelparam2var, null);
      Expr targetexpr = (Expr) targetCondition.translate();
      targetexpr = targetexpr.and(postexpr);

      if (targetvar2alloydecl.size() == 1)
        targetexpr = targetexpr.forSome(targetvar2alloydecl.values().iterator().next());
      else if (targetvar2alloydecl.size() > 1) {
        arraydecl = targetvar2alloydecl.values().toArray(new Decl[targetvar2alloydecl.size()]);
        targetexpr =
            targetexpr.forSome(arraydecl[0], Arrays.copyOfRange(arraydecl, 1, arraydecl.length));
      }

      for (EModelDomain dom : sourcedomains) {
        ECondition sourceCondition = dom.getCondition();
        sourceCondition.initTranslation(parent_translator, var2varmodel(), modelparam2var, null);
        sourceexpr = sourceexpr.and((Expr) sourceCondition.translate());
      }
      fact = (sourceexpr.implies(targetexpr));

      //			for (Decl d : sourcevar2alloydecl.values())
      //				EchoReporter.getInstance().debug("Source var decl: "+d.names+"::"+d.expr);
      //			for (Decl d : targetvar2alloydecl.values())
      //				EchoReporter.getInstance().debug("Target var decl: "+d.names+"::"+d.expr);

      if (sourcevar2alloydecl.size() == 1) {
        fact = fact.forAll(sourcevar2alloydecl.values().iterator().next());
      } else if (sourcevar2alloydecl.size() > 1) {
        arraydecl = sourcevar2alloydecl.values().toArray(new Decl[sourcevar2alloydecl.size()]);
        fact = fact.forAll(arraydecl[0], Arrays.copyOfRange(arraydecl, 1, arraydecl.length));
      }

      ECondition preCondition = relation.getPre();
      if (preCondition != null) {
        preCondition.initTranslation(parent_translator, var2varmodel(), modelparam2var, null);
        whenexpr = (Expr) preCondition.translate();

        fact = (whenexpr.implies(fact));
        for (Decl d : whenvar2alloydecl.values()) fact = fact.forAll(d);
      }
    } catch (Err a) {
      throw new ErrorAlloy(
          ErrorAlloy.FAIL_CREATE_VAR,
          "Failed to create relation constraint variables: " + relation.getName(),
          a,
          Task.TRANSLATE_TRANSFORMATION);
    }
    return fact;
  }