Beispiel #1
0
  /**
   * Initializes the variable lists and generates the respective Alloy declarations.
   *
   * @throws EchoError
   * @todo Support fom <code>CollectionTemplateExp</code>
   */
  private void initVariableLists() throws EchoError {
    Map<EVariable, String> whenvar2model = new HashMap<EVariable, String>();
    Map<EVariable, String> sourcevar2model = new HashMap<EVariable, String>();
    Map<EVariable, String> targetvar2model = new HashMap<EVariable, String>();

    for (EModelDomain dom : relation.getDomains()) {
      rootvariables.put(dom.getRootVariable(), dom.getModel().getName());
      if (dependency.target.equals(dom)) targetdomain = dom;
      else sourcedomains.add(dom);
    }

    ECondition preCondition = relation.getPre();
    if (preCondition != null) whenvar2model = preCondition.getVariables(null);

    for (EModelDomain dom : sourcedomains) {
      ECondition cond = dom.getCondition();
      sourcevar2model.putAll(cond.getVariables(dom.getModel().getName()));
    }

    for (EVariable x : whenvar2model.keySet()) {
      whenvar2model.put(x, sourcevar2model.get(x));
      sourcevar2model.remove(x);
    }

    ECondition temp = targetdomain.getCondition();
    targetvar2model = temp.getVariables(targetdomain.getModel().getName());

    ECondition postCondition = relation.getPost();
    if (postCondition != null)
      for (EVariable x : postCondition.getVariables(null).keySet())
        if (targetvar2model.get(x) == null) targetvar2model.put(x, null);

    for (EVariable x : sourcevar2model.keySet()) {
      if (sourcevar2model.get(x) == null) sourcevar2model.put(x, targetvar2model.get(x));
      targetvar2model.remove(x);
    }

    for (EVariable x : whenvar2model.keySet()) {
      if (whenvar2model.get(x) == null) whenvar2model.put(x, targetvar2model.get(x));
      targetvar2model.remove(x);
    }

    if (!top)
      for (EVariable x : rootvariables.keySet()) {
        whenvar2model.remove(x);
        targetvar2model.remove(x);
        sourcevar2model.remove(x);
      }

    for (EVariable s : sourcevar2model.keySet()) var2model.put(s.getName(), sourcevar2model.get(s));
    for (EVariable s : targetvar2model.keySet()) var2model.put(s.getName(), targetvar2model.get(s));
    for (EVariable s : whenvar2model.keySet()) var2model.put(s.getName(), whenvar2model.get(s));
    if (!top)
      for (EVariable s : rootvariables.keySet()) var2model.put(s.getName(), rootvariables.get(s));

    sourcevar2alloydecl =
        AlloyUtil.variableListToExpr(sourcevar2model.keySet(), var2varmodel(), modelparam2var);
    for (String s : sourcevar2alloydecl.keySet()) var2var.put(s, sourcevar2alloydecl.get(s).get());
    targetvar2alloydecl =
        AlloyUtil.variableListToExpr(targetvar2model.keySet(), var2varmodel(), modelparam2var);
    for (String s : targetvar2alloydecl.keySet()) var2var.put(s, targetvar2alloydecl.get(s).get());
    whenvar2alloydecl =
        AlloyUtil.variableListToExpr(whenvar2model.keySet(), var2varmodel(), modelparam2var);
    for (String s : whenvar2alloydecl.keySet()) var2var.put(s, whenvar2alloydecl.get(s).get());
    rootvar2alloydecl =
        AlloyUtil.variableListToExpr(rootvariables.keySet(), var2varmodel(), modelparam2var);
    if (!top)
      for (String s : rootvar2alloydecl.keySet()) var2var.put(s, rootvar2alloydecl.get(s).get());
  }
Beispiel #2
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;
  }