X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FSketchPlugin%2FSketchPlugin_Validators.cpp;h=8e85e516b552294decf451b9aec16d576a008977;hb=af69a9771accba3192bbb19edf77fb2dce428b7e;hp=b8b2fa53e498be217bd9f10fb550ea393caa5aca;hpb=4ca3fd41634c37f840d0cbb3f896fa97c2d3c457;p=modules%2Fshaper.git

diff --git a/src/SketchPlugin/SketchPlugin_Validators.cpp b/src/SketchPlugin/SketchPlugin_Validators.cpp
old mode 100644
new mode 100755
index b8b2fa53e..8e85e516b
--- a/src/SketchPlugin/SketchPlugin_Validators.cpp
+++ b/src/SketchPlugin/SketchPlugin_Validators.cpp
@@ -5,42 +5,65 @@
 // Author:      Vitaly SMETANNIKOV
 
 #include "SketchPlugin_Validators.h"
-#include "SketchPlugin_ConstraintDistance.h"
+
+#include "SketchPlugin_Arc.h"
+#include "SketchPlugin_Circle.h"
 #include "SketchPlugin_ConstraintCoincidence.h"
+#include "SketchPlugin_ConstraintDistance.h"
+#include "SketchPlugin_ConstraintFillet.h"
 #include "SketchPlugin_ConstraintRigid.h"
+#include "SketchPlugin_ConstraintTangent.h"
 #include "SketchPlugin_Line.h"
-#include "SketchPlugin_Arc.h"
-#include "SketchPlugin_Circle.h"
 #include "SketchPlugin_Point.h"
+#include "SketchPlugin_Sketch.h"
+#include "SketchPlugin_Tools.h"
 
 #include "SketcherPrs_Tools.h"
 
+#include <Events_InfoMessage.h>
+
 #include <ModelAPI_Data.h>
 #include <ModelAPI_Validator.h>
 #include <ModelAPI_AttributeDouble.h>
 #include <ModelAPI_AttributeRefAttr.h>
+
+#include <ModelAPI_AttributeRefAttrList.h>
 #include <ModelAPI_AttributeRefList.h>
 #include <ModelAPI_AttributeSelectionList.h>
+#include <ModelAPI_AttributeString.h>
 #include <ModelAPI_Session.h>
+#include <ModelAPI_Tools.h>
+#include <ModelAPI_ResultConstruction.h>
 
-#include <GeomValidators_ShapeType.h>
+#include <ModelGeomAlgo_Point2D.h>
 
+#include <GeomAPI_Circ.h>
+#include <GeomAPI_Lin.h>
+#include <GeomAPI_Edge.h>
+#include <GeomAPI_Vertex.h>
 #include <GeomDataAPI_Point2D.h>
 
+#include <algorithm>
+#include <cmath>
+
+const double tolerance = 1.e-7;
 
-bool SketchPlugin_DistanceAttrValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_DistanceAttrValidator::isValid(const AttributePtr& theAttribute,
                                                  const std::list<std::string>& theArguments,
-                                                 std::string& theError) const
+                                                 Events_InfoMessage& theError) const
 {
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
   // there is a check whether the feature contains a point and a linear edge or two point values
   std::string aParamA = theArguments.front();
   SessionPtr aMgr = ModelAPI_Session::get();
   ModelAPI_ValidatorsFactory* aFactory = aMgr->validators();
 
   AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-  if (!aRefAttr)
-    return false;
-
   bool isObject = aRefAttr->isObject();
   if (!isObject) {
     // an attribute is a point. A point value is valid always for the distance
@@ -49,86 +72,126 @@ bool SketchPlugin_DistanceAttrValidator::isValid(const AttributePtr& theAttribut
     // 1. check whether the references object is a linear
     ObjectPtr anObject = aRefAttr->object();
 
-    const ModelAPI_AttributeValidator* aShapeValidator = 
-      dynamic_cast<const GeomValidators_ShapeType*>(aFactory->validator("GeomValidators_ShapeType"));
+    const ModelAPI_AttributeValidator* aShapeValidator =
+      dynamic_cast<const ModelAPI_AttributeValidator*>(
+      aFactory->validator("GeomValidators_ShapeType"));
     std::list<std::string> anArguments;
     anArguments.push_back("circle");
-    bool aShapeValid = aShapeValidator->isValid(aRefAttr, anArguments);
+    Events_InfoMessage aCircleError;
+    bool aShapeValid = aShapeValidator->isValid(aRefAttr, anArguments, aCircleError);
     // the circle line is not a valid case
-    if (aShapeValid)
+    if (aShapeValid) {
+      theError = "Circle can not be used in distance constraint";
       return false;
-      
+    }
+
     anArguments.clear();
     anArguments.push_back("line");
-    aShapeValid = aShapeValidator->isValid(aRefAttr, anArguments);
+    Events_InfoMessage aLineError;
+    aShapeValid = aShapeValidator->isValid(aRefAttr, anArguments, aLineError);
     // if the attribute value is not a line, that means it is a vertex. A vertex is always valid
-    if (!aShapeValid)
-      return true;
-
-    FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
-    // If it is a line then we have to check that first attribute id not a line
-    std::shared_ptr<SketchPlugin_Feature> aSFeature =
-                            std::dynamic_pointer_cast<SketchPlugin_Feature>(theAttribute->owner());
-    SketchPlugin_Sketch* aSketch = aSFeature->sketch();
-    std::shared_ptr<GeomAPI_Ax3> aPlane = SketchPlugin_Sketch::plane(aSketch);
-    std::shared_ptr<GeomDataAPI_Point2D> aPoint = SketcherPrs_Tools::getFeaturePoint(
-                                                               aFeature->data(), aParamA, aPlane);
-    if (aPoint)
-      return true;
+    if (aShapeValid) {
+      FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+      // If it is a line then we have to check that first attribute id not a line
+      std::shared_ptr<SketchPlugin_Feature> aSFeature =
+        std::dynamic_pointer_cast<SketchPlugin_Feature>(theAttribute->owner());
+      SketchPlugin_Sketch* aSketch = aSFeature->sketch();
+      std::shared_ptr<GeomAPI_Ax3> aPlane = SketchPlugin_Sketch::plane(aSketch);
+      std::shared_ptr<GeomDataAPI_Point2D> aPoint = SketcherPrs_Tools::getFeaturePoint(
+        aFeature->data(), aParamA, aPlane);
+      if (!aPoint.get()) {
+        theError = "One of parameters of distance constraint should be a point";
+        return false;
+      }
+    }
   }
-  return false;
+  return true;
 }
 
-bool SketchPlugin_TangentAttrValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_TangentAttrValidator::isValid(const AttributePtr& theAttribute,
                                                 const std::list<std::string>& theArguments,
-                                                std::string& theError) const
+                                                Events_InfoMessage& theError) const
 {
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
   // there is a check whether the feature contains a point and a linear edge or two point values
   std::string aParamA = theArguments.front();
   SessionPtr aMgr = ModelAPI_Session::get();
   ModelAPI_ValidatorsFactory* aFactory = aMgr->validators();
 
-  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
-  AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-  if (!aRefAttr)
-    return false;
+  FeaturePtr anAttributeFeature =
+    std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+  AttributeRefAttrPtr aRefAttr =
+    std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
 
   bool isObject = aRefAttr->isObject();
   ObjectPtr anObject = aRefAttr->object();
-  if (isObject && anObject) {
+  if (isObject && anObject.get()) {
     FeaturePtr aRefFea = ModelAPI_Feature::feature(anObject);
 
-    AttributeRefAttrPtr aOtherAttr = aFeature->data()->refattr(aParamA);
+    AttributeRefAttrPtr aOtherAttr = anAttributeFeature->data()->refattr(aParamA);
     ObjectPtr aOtherObject = aOtherAttr->object();
     FeaturePtr aOtherFea = ModelAPI_Feature::feature(aOtherObject);
+    if (!aOtherFea)
+      return true;
 
     if (aRefFea->getKind() == SketchPlugin_Line::ID()) {
-      if (aOtherFea->getKind() != SketchPlugin_Arc::ID())
+      if (aOtherFea->getKind() != SketchPlugin_Arc::ID() &&
+          aOtherFea->getKind() != SketchPlugin_Circle::ID()) {
+        theError = "It refers to a %1, but %2 is neither an %3 nor %4";
+        theError.arg(SketchPlugin_Line::ID()).arg(aParamA)
+            .arg(SketchPlugin_Arc::ID()).arg(SketchPlugin_Circle::ID());
         return false;
-    } else if (aRefFea->getKind() == SketchPlugin_Arc::ID()) {
+      }
+    }
+    else if (aRefFea->getKind() == SketchPlugin_Arc::ID() ||
+             aRefFea->getKind() == SketchPlugin_Circle::ID()) {
       if (aOtherFea->getKind() != SketchPlugin_Line::ID() &&
-          aOtherFea->getKind() != SketchPlugin_Arc::ID())
+          aOtherFea->getKind() != SketchPlugin_Arc::ID() &&
+          aOtherFea->getKind() != SketchPlugin_Circle::ID()) {
+        theError = "It refers to an %1, but %2 is not a %3 or an %4 or a %5";
+        theError.arg(SketchPlugin_Arc::ID()).arg(aParamA)
+            .arg(SketchPlugin_Line::ID()).arg(SketchPlugin_Arc::ID())
+            .arg(SketchPlugin_Circle::ID());
         return false;
-    } else
+      }
+    }
+    else {
+      theError = "It refers to %1, but should refer to %2 or %3 or %4";
+      theError.arg(aRefFea->getKind()).arg(SketchPlugin_Line::ID())
+          .arg(SketchPlugin_Arc::ID()).arg(SketchPlugin_Circle::ID());
       return false;
-
+    }
     return true;
   }
-  return false;
+  else {
+    theError = "It uses an empty object";
+    return false;
+  }
+
+  return true;
 }
 
-bool SketchPlugin_NotFixedValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_NotFixedValidator::isValid(const AttributePtr& theAttribute,
                                              const std::list<std::string>& theArguments,
-                                             std::string& theError) const
+                                             Events_InfoMessage& theError) const
 {
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
   std::shared_ptr<SketchPlugin_Feature> aFeature =
       std::dynamic_pointer_cast<SketchPlugin_Feature>(theAttribute->owner());
   if (!aFeature)
     return true;
 
   AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-  if (!aRefAttr)
-    return false;
 
   SketchPlugin_Sketch* aSketch = aFeature->sketch();
   int aNbFeatures = aSketch->numberOfSubs();
@@ -139,88 +202,123 @@ bool SketchPlugin_NotFixedValidator::isValid(const AttributePtr& theAttribute,
     AttributeRefAttrPtr aRAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
         aSubFeature->attribute(SketchPlugin_ConstraintRigid::ENTITY_A()));
     if (aRefAttr->isObject()) {
-      if (aRefAttr->object() == aRAttr->object())
+      if (aRefAttr->object() == aRAttr->object()) {
+        ObjectPtr anObject = aRefAttr->object();
+        std::string aName = anObject.get() ? anObject->data()->name() : "";
+        theError = "The object %1 has been already fixed.";
+        theError.arg(aName);
         return false;
-    } else if (aRefAttr->attr() == aRAttr->attr())
+      }
+    }
+    else if (aRefAttr->attr() == aRAttr->attr()) {
+      AttributePtr anAttribute = aRefAttr->attr();
+      std::string aName = anAttribute.get() ? anAttribute->id() : "";
+      theError = "The attribute %1 has been already fixed.";
+      theError.arg(aName);
       return false;
+    }
   }
   return true;
 }
 
-bool SketchPlugin_EqualAttrValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_EqualAttrValidator::isValid(const AttributePtr& theAttribute,
                                               const std::list<std::string>& theArguments,
-                                              std::string& theError) const
+                                              Events_InfoMessage& theError) const
 {
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
   std::string aParamA = theArguments.front();
   FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
   AttributeRefAttrPtr aRefAttr[2];
   aRefAttr[0] = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-  if (!aRefAttr)
-    return false;
   aRefAttr[1] = aFeature->data()->refattr(aParamA);
 
-  if (!aRefAttr[0]->isObject() || !aRefAttr[1]->isObject())
+  if (!aRefAttr[0]->isObject() || !aRefAttr[1]->isObject()) {
+    theError = "Attributes can not be used in equal constraint";
     return false;
+  }
 
-  int aType[2] = {0, 0}; // types of attributes: 0 - incorrect, 1 - line, 2 - circle, 3 - arc
+  std::string aType[2];
   std::list<std::string> anArguments;
   for (int i = 0; i < 2; i++) {
     ObjectPtr anObject = aRefAttr[i]->object();
-    aFeature = ModelAPI_Feature::feature(anObject);
-    if (!aFeature)
+    if (!anObject.get()) {
+      theError = "An empty object is used.";
       return false;
-
-    if (aFeature->getKind() == SketchPlugin_Line::ID()) {
-      aType[i] = 1;
-      continue;
     }
-    if (aFeature->getKind() == SketchPlugin_Circle::ID()) {
-      aType[i] = 2;
-      continue;
+
+    aFeature = ModelAPI_Feature::feature(anObject);
+    if (!aFeature.get()) {
+      theError = "An empty feature is used.";
+      return false;
     }
-    if (aFeature->getKind() == SketchPlugin_Arc::ID()) {
-      aType[i] = 3;
-      continue;
+
+    aType[i] = aFeature->getKind();
+    if (aFeature->getKind() != SketchPlugin_Line::ID() &&
+        aFeature->getKind() != SketchPlugin_Circle::ID() &&
+        aFeature->getKind() != SketchPlugin_Arc::ID()) {
+      theError = "The %1 feature kind of attribute is wrong. It should be %2 or %3 or %4";
+      theError.arg(aFeature->getKind()).arg(SketchPlugin_Line::ID())
+          .arg(SketchPlugin_Circle::ID()).arg(SketchPlugin_Arc::ID());
+      // wrong type of attribute
+      return false;
     }
-    // wrong type of attribute
-    return false;
   }
 
-  if ((aType[0] == 1 && aType[1] == 2) ||
-      (aType[0] == 2 && aType[1] == 1))
+  if ((aType[0] == SketchPlugin_Line::ID() || aType[1] == SketchPlugin_Line::ID()) &&
+      aType[0] != aType[1]) {
+    theError = "Feature with kinds %1 and %2 can not be equal.";
+    theError.arg(aType[0]).arg(aType[1]);
     return false;
+  }
   return true;
 }
 
-bool SketchPlugin_MirrorAttrValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_MirrorAttrValidator::isValid(const AttributePtr& theAttribute,
                                                const std::list<std::string>& theArguments,
-                                               std::string& theError) const
+                                               Events_InfoMessage& theError) const
 {
-  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
-  AttributeSelectionListPtr aSelAttr = 
-    std::dynamic_pointer_cast<ModelAPI_AttributeSelectionList>(theAttribute);
-  if (!aSelAttr)
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefList::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
     return false;
+  }
+
+  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+  AttributeRefListPtr aSelAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(theAttribute);
 
   AttributeRefListPtr aRefListOfMirrored = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
       aFeature->attribute(SketchPlugin_Constraint::ENTITY_C()));
   std::list<ObjectPtr> aMirroredObjects = aRefListOfMirrored->list();
 
   for(int anInd = 0; anInd < aSelAttr->size(); anInd++) {
-    std::shared_ptr<ModelAPI_AttributeSelection> aSelect = aSelAttr->value(anInd);
+    ObjectPtr aSelObject = aSelAttr->object(anInd);
+    std::string aName = aSelObject.get() ? aSelObject->data()->name() : "";
     std::list<ObjectPtr>::iterator aMirIter = aMirroredObjects.begin();
     for (; aMirIter != aMirroredObjects.end(); aMirIter++)
-      if (aSelect->context() == *aMirIter)
+      if (aSelObject == *aMirIter) {
+        theError = "The object %1 is a result of mirror";
+        theError.arg(aName);
         return false;
+      }
   }
   return true;
 }
 
-
-bool SketchPlugin_CoincidenceAttrValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_CoincidenceAttrValidator::isValid(const AttributePtr& theAttribute,
                                                     const std::list<std::string>& theArguments,
-                                                    std::string& theError) const
+                                                    Events_InfoMessage& theError) const
 {
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
   // there is a check whether the feature contains a point and a linear edge or two point values
   std::string aParamA = theArguments.front();
   SessionPtr aMgr = ModelAPI_Session::get();
@@ -228,20 +326,32 @@ bool SketchPlugin_CoincidenceAttrValidator::isValid(const AttributePtr& theAttri
 
   FeaturePtr aConstraint = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
   AttributeRefAttrPtr aRefAttrA = aConstraint->data()->refattr(aParamA);
-  if (!aRefAttrA)
+  if (!aRefAttrA) {
+    theError = "The %1 attribute should be %2";
+    theError.arg(aParamA).arg(ModelAPI_AttributeRefAttr::typeId());
     return false;
+  }
 
-  AttributeRefAttrPtr aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-  if (!aRefAttrB)
-    return false;
+  AttributeRefAttrPtr aRefAttrB =
+    std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
 
   // first attribute is a point, it may coincide with any object
   if (!aRefAttrA->isObject())
     return true;
   else {
+    ObjectPtr anObject = aRefAttrA->object();
+    if (!anObject.get()) {
+      theError = "%1 attribute has an empty object";
+      theError.arg(aParamA);
+      return false;
+    }
     FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttrA->object());
-    if (!aFeature)
+    if (!aFeature.get()) {
+      theError = "%1 attribute has an empty feature";
+      theError.arg(aParamA);
       return false;
+    }
+
     if (aFeature->getKind() == SketchPlugin_Point::ID())
       return true;
   }
@@ -251,25 +361,32 @@ bool SketchPlugin_CoincidenceAttrValidator::isValid(const AttributePtr& theAttri
     return true;
   else {
     FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttrB->object());
-    if (!aFeature)
+    if (!aFeature) {
+      theError = "%1 attribute has an empty object";
+      theError.arg(theAttribute->id());
       return false;
+    }
     if (aFeature->getKind() == SketchPlugin_Point::ID())
       return true;
   }
-
+  theError = "There is no an attribute filled by a point";
   return false;
 }
 
 
-bool SketchPlugin_CopyValidator::isValid(const AttributePtr& theAttribute, 
+bool SketchPlugin_CopyValidator::isValid(const AttributePtr& theAttribute,
                                          const std::list<std::string>& theArguments,
-                                         std::string& theError) const
+                                         Events_InfoMessage& theError) const
 {
-  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
-  AttributeSelectionListPtr aSelAttr = 
-    std::dynamic_pointer_cast<ModelAPI_AttributeSelectionList>(theAttribute);
-  if (!aSelAttr)
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefList::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
     return false;
+  }
+
+  FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+  AttributeRefListPtr aSelAttr =
+    std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(theAttribute);
 
   AttributeRefListPtr aRefListOfInitial = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
       aFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
@@ -280,18 +397,586 @@ bool SketchPlugin_CopyValidator::isValid(const AttributePtr& theAttribute,
 
   std::list<ObjectPtr>::iterator anObjIter;
   for(int anInd = 0; anInd < aSelAttr->size(); anInd++) {
-    std::shared_ptr<ModelAPI_AttributeSelection> aSelect = aSelAttr->value(anInd);
+    ObjectPtr aSelObject = aSelAttr->object(anInd);
     anObjIter = anInitialObjects.begin();
     for (; anObjIter != anInitialObjects.end(); anObjIter++)
-      if (aSelect->context() == *anObjIter)
+      if (aSelObject == *anObjIter)
         break;
     if (anObjIter != anInitialObjects.end())
       continue;
     anObjIter = aCopiedObjects.begin();
     for (; anObjIter != aCopiedObjects.end(); anObjIter++)
-      if (aSelect->context() == *anObjIter)
+      if (aSelObject == *anObjIter) {
+        std::string aName = aSelObject.get() ? aSelObject->data()->name() : "";
+        theError = "The object %1 is a result of copy";
+        theError.arg(aName);
         return false;
+      }
   }
   return true;
 }
 
+bool SketchPlugin_SolverErrorValidator::isValid(
+  const std::shared_ptr<ModelAPI_Feature>& theFeature,
+  const std::list<std::string>& theArguments,
+  Events_InfoMessage& theError) const
+{
+  AttributeStringPtr aAttributeString = theFeature->string(SketchPlugin_Sketch::SOLVER_ERROR());
+
+  if (!aAttributeString->value().empty()) {
+    theError = aAttributeString->value();
+    return false;
+  }
+
+  return true;
+}
+
+bool SketchPlugin_SolverErrorValidator::isNotObligatory(std::string theFeature,
+                                                        std::string theAttribute)
+{
+  return true;
+}
+
+static bool hasSameTangentFeature(const std::set<AttributePtr>& theRefsList,
+                                  const FeaturePtr theFeature)
+{
+  for(std::set<AttributePtr>::const_iterator
+      anIt = theRefsList.cbegin(); anIt != theRefsList.cend(); ++anIt) {
+    std::shared_ptr<ModelAPI_Attribute> aAttr = (*anIt);
+    FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
+    if (aFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
+      AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aFeature->attribute(SketchPlugin_ConstraintTangent::ENTITY_A()));
+      AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aFeature->attribute(SketchPlugin_ConstraintTangent::ENTITY_B()));
+      if(anAttrRefA.get()) {
+        ResultPtr aResA = std::dynamic_pointer_cast<ModelAPI_Result>(anAttrRefA->object());
+        if(aResA.get()) {
+          DocumentPtr aDoc = aResA->document();
+          if(aDoc.get()) {
+            FeaturePtr aFeatureA = aDoc->feature(aResA);
+            if(aFeatureA.get() && aFeatureA == theFeature) {
+              return true;
+            }
+          }
+        }
+      }
+      if(anAttrRefB.get()) {
+        ResultPtr aResB = std::dynamic_pointer_cast<ModelAPI_Result>(anAttrRefB->object());
+        if(aResB.get()) {
+          DocumentPtr aDoc = aResB->document();
+          if(aDoc.get()) {
+            FeaturePtr aFeatureB = aDoc->feature(aResB);
+            if(aFeatureB.get() && aFeatureB == theFeature) {
+              return true;
+            }
+          }
+        }
+      }
+    }
+  }
+  return false;
+}
+
+bool SketchPlugin_FilletVertexValidator::isValid(const AttributePtr& theAttribute,
+                                                 const std::list<std::string>& theArguments,
+                                                 Events_InfoMessage& theError) const
+{
+  std::shared_ptr<SketchPlugin_ConstraintFillet> aFilletFeature =
+    std::dynamic_pointer_cast<SketchPlugin_ConstraintFillet>(theAttribute->owner());
+  AttributeRefAttrListPtr aPointsRefList =
+    std::dynamic_pointer_cast<ModelAPI_AttributeRefAttrList>(theAttribute);
+  if(aPointsRefList->size() == 0) {
+    theError = "Error: List of points is empty.";
+    return false;
+  }
+
+  std::map<AttributePtr, SketchPlugin_ConstraintFillet::FilletFeatures> aPointsFeaturesMap =
+    aFilletFeature->pointsFeaturesMap();
+  std::set<AttributePtr> aSetOfPointsOnResultEdges;
+  for(std::map<AttributePtr, SketchPlugin_ConstraintFillet::FilletFeatures>::iterator
+      aPointsIter = aPointsFeaturesMap.begin();
+      aPointsIter != aPointsFeaturesMap.end();
+      ++aPointsIter) {
+    const SketchPlugin_ConstraintFillet::FilletFeatures& aFeatures = aPointsIter->second;
+    const std::list<FeaturePtr>& aResultEdges = aFeatures.resultEdges;
+    for(std::list<FeaturePtr>::const_iterator aResultIter = aResultEdges.cbegin();
+        aResultIter != aResultEdges.cend();
+        ++aResultIter) {
+      FeaturePtr aResultFeature = *aResultIter;
+      if(aResultFeature->getKind() == SketchPlugin_Line::ID()) {
+        aSetOfPointsOnResultEdges.insert(aResultFeature->attribute(SketchPlugin_Line::START_ID()));
+        aSetOfPointsOnResultEdges.insert(aResultFeature->attribute(SketchPlugin_Line::END_ID()));
+      } else if(aResultFeature->getKind() == SketchPlugin_Arc::ID()) {
+        aSetOfPointsOnResultEdges.insert(aResultFeature->attribute(SketchPlugin_Arc::START_ID()));
+        aSetOfPointsOnResultEdges.insert(aResultFeature->attribute(SketchPlugin_Arc::END_ID()));
+      }
+    }
+  }
+
+  std::list<std::pair<ObjectPtr, AttributePtr>> aPointsList = aPointsRefList->list();
+  for(std::list<std::pair<ObjectPtr, AttributePtr>>::const_iterator
+      aPointsIt = aPointsList.cbegin(); aPointsIt != aPointsList.cend(); aPointsIt++) {
+    ObjectPtr anObject = (*aPointsIt).first;
+    AttributePtr aPointAttribute = (*aPointsIt).second;
+    if (!aPointAttribute.get())
+        return false;
+    std::shared_ptr<GeomAPI_Pnt2d> aSelectedPnt =
+      std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aPointAttribute)->pnt();
+
+    // If we alredy have some result then:
+    // - if it is the same point all ok, just skip it
+    // - if it is point on the fillet result edge then it is not valid
+    if(!aPointsFeaturesMap.empty()) {
+      if(aPointsFeaturesMap.find(aPointAttribute) != aPointsFeaturesMap.end()) {
+        continue;
+      }
+
+      // Check that selected point not on the one of the fillet result edge.
+      if(aSetOfPointsOnResultEdges.find(aPointAttribute) != aSetOfPointsOnResultEdges.end()) {
+        return false;
+      }
+    }
+
+    // Obtain constraint coincidence for the fillet point.
+    const std::set<AttributePtr>& aRefsList = aPointAttribute->owner()->data()->refsToMe();
+    FeaturePtr aConstraintCoincidence;
+    for(std::set<AttributePtr>::const_iterator anIt = aRefsList.cbegin();
+        anIt != aRefsList.cend(); ++anIt) {
+      std::shared_ptr<ModelAPI_Attribute> aAttr = (*anIt);
+      FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
+      if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
+        AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
+        AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
+        if(anAttrRefA.get() && !anAttrRefA->isObject()) {
+          AttributePtr anAttrA = anAttrRefA->attr();
+          if(aPointAttribute == anAttrA) {
+            aConstraintCoincidence = aConstrFeature;
+            break;
+          }
+        }
+        if(anAttrRefB.get() && !anAttrRefB->isObject()) {
+          AttributePtr anAttrB = anAttrRefB->attr();
+          if(aPointAttribute == anAttrB) {
+            aConstraintCoincidence = aConstrFeature;
+            break;
+          }
+        }
+      }
+    }
+
+    if(!aConstraintCoincidence.get()) {
+      theError = "Error: one of the selected point does not have coicidence.";
+      return false;
+    }
+
+    // Get coincides from constraint.
+    std::set<FeaturePtr> aCoinsides;
+    SketchPlugin_Tools::findCoincidences(aConstraintCoincidence,
+                                         SketchPlugin_ConstraintCoincidence::ENTITY_A(),
+                                         aCoinsides);
+    SketchPlugin_Tools::findCoincidences(aConstraintCoincidence,
+                                         SketchPlugin_ConstraintCoincidence::ENTITY_B(),
+                                         aCoinsides);
+
+    // Remove points from set of coincides.
+    std::set<FeaturePtr> aNewSetOfCoincides;
+    for(std::set<FeaturePtr>::iterator anIt = aCoinsides.begin();
+        anIt != aCoinsides.end(); ++anIt) {
+      if((*anIt)->getKind() != SketchPlugin_Line::ID() &&
+         (*anIt)->getKind() != SketchPlugin_Arc::ID()) {
+           continue;
+      }
+      if((*anIt)->getKind() == SketchPlugin_Arc::ID()) {
+        AttributePtr anArcCenter = (*anIt)->attribute(SketchPlugin_Arc::CENTER_ID());
+        std::shared_ptr<GeomAPI_Pnt2d> anArcCenterPnt =
+          std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anArcCenter)->pnt();
+        double aDistSelectedArcCenter = aSelectedPnt->distance(anArcCenterPnt);
+        if(aDistSelectedArcCenter < tolerance) {
+          continue;
+        }
+      }
+      aNewSetOfCoincides.insert(*anIt);
+    }
+    aCoinsides = aNewSetOfCoincides;
+
+    // If we still have more than two coincides remove auxilary entities from set of coincides.
+    if(aCoinsides.size() > 2) {
+      aNewSetOfCoincides.clear();
+      for(std::set<FeaturePtr>::iterator anIt = aCoinsides.begin();
+          anIt != aCoinsides.end(); ++anIt) {
+        if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
+          aNewSetOfCoincides.insert(*anIt);
+        }
+      }
+      aCoinsides = aNewSetOfCoincides;
+    }
+
+    if(aCoinsides.size() != 2) {
+      theError = "Error: One of the selected points does not have two suitable edges for fillet.";
+      return false;
+    }
+
+    // Check that selected edges don't have tangent constraint.
+    std::set<FeaturePtr>::iterator anIt = aCoinsides.begin();
+    FeaturePtr aFirstFeature = *anIt++;
+    FeaturePtr aSecondFeature = *anIt;
+    const std::set<AttributePtr>& aFirstFeatureRefsList = aFirstFeature->data()->refsToMe();
+    if(hasSameTangentFeature(aFirstFeatureRefsList, aSecondFeature)) {
+      theError = "Error: Edges in selected point has tangent constraint.";
+      return false;
+    }
+
+    std::list<ResultPtr> aFirstResults = aFirstFeature->results();
+    for(std::list<ResultPtr>::iterator aResIt = aFirstResults.begin();
+        aResIt != aFirstResults.end(); ++aResIt) {
+      ResultPtr aRes = *aResIt;
+      const std::set<AttributePtr>& aResRefsList = aRes->data()->refsToMe();
+      if(hasSameTangentFeature(aResRefsList, aSecondFeature)) {
+        theError = "Error: Edges in selected point has tangent constraint.";
+        return false;
+      }
+    }
+
+    // Check that lines not collinear
+    if(aFirstFeature->getKind() == SketchPlugin_Line::ID() &&
+        aSecondFeature->getKind() == SketchPlugin_Line::ID()) {
+      std::string aStartAttr = SketchPlugin_Line::START_ID();
+      std::string anEndAttr = SketchPlugin_Line::END_ID();
+      std::shared_ptr<GeomAPI_Pnt2d> aFirstStartPnt, aFirstEndPnt, aSecondStartPnt, aSecondEndPnt;
+      aFirstStartPnt =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        aFirstFeature->attribute(aStartAttr))->pnt();
+      aFirstEndPnt =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFirstFeature->attribute(anEndAttr))->pnt();
+      aSecondStartPnt =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        aSecondFeature->attribute(aStartAttr))->pnt();
+      aSecondEndPnt =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+        aSecondFeature->attribute(anEndAttr))->pnt();
+      double aCheck1 =
+        fabs((aFirstEndPnt->x() - aFirstStartPnt->x()) *
+        (aSecondStartPnt->y() - aFirstStartPnt->y()) -
+        (aSecondStartPnt->x() - aFirstStartPnt->x()) * (aFirstEndPnt->y() - aFirstStartPnt->y()));
+      double aCheck2 =
+        fabs((aFirstEndPnt->x() - aFirstStartPnt->x()) *
+        (aSecondEndPnt->y() - aFirstStartPnt->y()) -
+        (aSecondEndPnt->x() - aFirstStartPnt->x()) * (aFirstEndPnt->y() - aFirstStartPnt->y()));
+      if(aCheck1 < 1.e-7 && aCheck2 < 1.e-7) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+bool SketchPlugin_MiddlePointAttrValidator::isValid(const AttributePtr& theAttribute,
+                                                    const std::list<std::string>& theArguments,
+                                                    Events_InfoMessage& theError) const
+{
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
+  // there is a check whether the feature contains a point and a linear edge or two point values
+  std::string aParamA = theArguments.front();
+  SessionPtr aMgr = ModelAPI_Session::get();
+  ModelAPI_ValidatorsFactory* aFactory = aMgr->validators();
+
+  FeaturePtr anAttributeFeature =
+    std::dynamic_pointer_cast<ModelAPI_Feature>(theAttribute->owner());
+  AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
+  AttributeRefAttrPtr anOtherAttr = anAttributeFeature->data()->refattr(aParamA);
+
+  AttributeRefAttrPtr aRefAttrs[2] = {aRefAttr, anOtherAttr};
+  int aNbPoints = 0;
+  int aNbLines = 0;
+  for (int i = 0; i < 2; ++i) {
+    if (!aRefAttrs[i]->isObject())
+      ++aNbPoints;
+    else {
+      FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttrs[i]->object());
+      if (!aFeature) {
+        if (aNbPoints + aNbLines != 0)
+          return true;
+        else continue;
+      }
+
+      if (aFeature->getKind() == SketchPlugin_Point::ID())
+        ++aNbPoints;
+      else if (aFeature->getKind() == SketchPlugin_Line::ID())
+        ++aNbLines;
+    }
+  }
+
+  if (aNbPoints != 1 || aNbLines != 1) {
+    theError = "Middle point constraint allows points and lines only";
+    return false;
+  }
+  return true;
+}
+
+bool SketchPlugin_ArcTangentPointValidator::isValid(const AttributePtr& theAttribute,
+                                                    const std::list<std::string>& /*theArguments*/,
+                                                    Events_InfoMessage& theError) const
+{
+  if (theAttribute->attributeType() != ModelAPI_AttributeRefAttr::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+  AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
+  AttributePtr anAttr = aRefAttr->attr();
+  if (!anAttr) {
+    theError = "The attribute %1 should be a point";
+    theError.arg(theAttribute->id());
+    return false;
+  }
+
+  FeaturePtr anAttrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
+  const std::string& aFeatureType = anAttrFeature->getKind();
+  if (aFeatureType == SketchPlugin_Arc::ID()) {
+    // selected point should not be a center of arc
+    const std::string& aPntId = anAttr->id();
+    if (aPntId != SketchPlugin_Arc::START_ID() && aPntId != SketchPlugin_Arc::END_ID()) {
+      theError = "The attribute %1 is not supported";
+      theError.arg(aPntId);
+      return false;
+    }
+  }
+  else if (aFeatureType == SketchPlugin_Line::ID()) {
+    // selected point should be bound point of line
+    const std::string& aPntId = anAttr->id();
+    if (aPntId != SketchPlugin_Line::START_ID() && aPntId != SketchPlugin_Line::END_ID()) {
+      theError = "The attribute %1 is not supported";
+      theError.arg(aPntId);
+      return false;
+    }
+  }
+  else {
+    theError = "Unable to build tangent arc on %1";
+    theError.arg(anAttrFeature->getKind());
+    return false;
+  }
+
+  // Check the tangent point is equal to arc end
+  FeaturePtr anArc = std::dynamic_pointer_cast<ModelAPI_Feature>(aRefAttr->owner());
+  std::shared_ptr<GeomDataAPI_Point2D> anEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+      anArc->attribute(SketchPlugin_Arc::END_ID()));
+  if (anEndPoint->isInitialized()) {
+    std::shared_ptr<GeomDataAPI_Point2D> aTangPt =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttr);
+    if (aTangPt->pnt()->distance(anEndPoint->pnt()) < tolerance) {
+      theError = "Unable to build arc on same points";
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool SketchPlugin_IntersectionValidator::isValid(const AttributePtr& theAttribute,
+                                                 const std::list<std::string>& theArguments,
+                                                 Events_InfoMessage& theError) const
+{
+  if (theAttribute->attributeType() != ModelAPI_AttributeSelection::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+  AttributeSelectionPtr aLineAttr =
+                       std::dynamic_pointer_cast<ModelAPI_AttributeSelection>(theAttribute);
+  std::shared_ptr<GeomAPI_Edge> anEdge;
+  if(aLineAttr && aLineAttr->value() && aLineAttr->value()->isEdge()) {
+    anEdge = std::shared_ptr<GeomAPI_Edge>(new GeomAPI_Edge(aLineAttr->value()));
+  } else if(aLineAttr->context() &&
+            aLineAttr->context()->shape() && aLineAttr->context()->shape()->isEdge()) {
+    anEdge = std::shared_ptr<GeomAPI_Edge>(new GeomAPI_Edge(aLineAttr->context()->shape()));
+  }
+
+  if (!anEdge || !anEdge->isLine()) {
+    theError = "The attribute %1 should be a line";
+    theError.arg(theAttribute->id());
+    return false;
+  }
+
+  std::shared_ptr<GeomAPI_Dir> aLineDir = anEdge->line()->direction();
+
+  // find a sketch
+  std::shared_ptr<SketchPlugin_Sketch> aSketch;
+  std::set<AttributePtr> aRefs = aLineAttr->owner()->data()->refsToMe();
+  std::set<AttributePtr>::const_iterator anIt = aRefs.begin();
+  for (; anIt != aRefs.end(); ++anIt) {
+    CompositeFeaturePtr aComp =
+        std::dynamic_pointer_cast<ModelAPI_CompositeFeature>((*anIt)->owner());
+    if (aComp && aComp->getKind() == SketchPlugin_Sketch::ID()) {
+      aSketch = std::dynamic_pointer_cast<SketchPlugin_Sketch>(aComp);
+      break;
+    }
+  }
+  if (!aSketch) {
+    theError = "There is no sketch referring to the current feature";
+    return false;
+  }
+
+  std::shared_ptr<GeomAPI_Pln> aPlane = aSketch->plane();
+  std::shared_ptr<GeomAPI_Dir> aNormal = aPlane->direction();
+  return fabs(aNormal->dot(aLineDir)) > tolerance * tolerance;
+}
+
+bool SketchPlugin_SplitValidator::isValid(const AttributePtr& theAttribute,
+                                          const std::list<std::string>& theArguments,
+                                          Events_InfoMessage& theError) const
+{
+  bool aValid = false;
+
+  if (theAttribute->attributeType() != ModelAPI_AttributeReference::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return aValid;
+  }
+  AttributeReferencePtr aFeatureAttr =
+            std::dynamic_pointer_cast<ModelAPI_AttributeReference>(theAttribute);
+
+  ObjectPtr anAttrObject = aFeatureAttr->value();
+  FeaturePtr anAttrFeature = ModelAPI_Feature::feature(anAttrObject);
+  if (!anAttrFeature)
+    return aValid;
+
+  std::string aKind = anAttrFeature->getKind();
+  if (aKind == SketchPlugin_Line::ID() ||
+      aKind == SketchPlugin_Arc::ID() ||
+      aKind == SketchPlugin_Circle::ID()) {
+
+    std::set<ResultPtr> anEdgeShapes;
+    ModelAPI_Tools::shapesOfType(anAttrFeature, GeomAPI_Shape::EDGE, anEdgeShapes);
+    if (anEdgeShapes.empty() || anEdgeShapes.size() > 1 /*there case has not existed yet*/)
+      return aValid;
+
+    // coincidences to the feature
+    std::set<std::shared_ptr<GeomDataAPI_Point2D> > aRefAttributes;
+    ModelGeomAlgo_Point2D::getPointsOfReference(anAttrFeature,
+                        SketchPlugin_ConstraintCoincidence::ID(),
+                        aRefAttributes, SketchPlugin_Point::ID(), SketchPlugin_Point::COORD_ID());
+
+    GeomShapePtr anAttrShape = (*anEdgeShapes.begin())->shape();
+    std::shared_ptr<SketchPlugin_Feature> aSFeature =
+                                 std::dynamic_pointer_cast<SketchPlugin_Feature>(anAttrFeature);
+    SketchPlugin_Sketch* aSketch = aSFeature->sketch();
+
+    std::shared_ptr<ModelAPI_Data> aData = aSketch->data();
+    std::shared_ptr<GeomDataAPI_Point> aC = std::dynamic_pointer_cast<GeomDataAPI_Point>(
+        aData->attribute(SketchPlugin_Sketch::ORIGIN_ID()));
+    std::shared_ptr<GeomDataAPI_Dir> aX = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
+        aData->attribute(SketchPlugin_Sketch::DIRX_ID()));
+    std::shared_ptr<GeomDataAPI_Dir> aNorm = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
+        aData->attribute(SketchPlugin_Sketch::NORM_ID()));
+    std::shared_ptr<GeomAPI_Dir> aDirY(new GeomAPI_Dir(aNorm->dir()->cross(aX->dir())));
+
+    typedef std::map<std::shared_ptr<GeomAPI_Pnt>,
+                     std::pair<std::list<std::shared_ptr<GeomDataAPI_Point2D> >,
+                               std::list<std::shared_ptr<ModelAPI_Object> > > > PointToRefsMap;
+    PointToRefsMap aPointsInfo;
+
+    //std::list<std::shared_ptr<GeomAPI_Pnt> > aPoints;
+    //std::map<std::shared_ptr<GeomDataAPI_Point2D>, std::shared_ptr<GeomAPI_Pnt> >
+    //  aPointToAttributes;
+    //std::map<std::shared_ptr<GeomAPI_Pnt>,
+    //                       std::list< std::shared_ptr<GeomDataAPI_Point2D> > > aPointToAttributes;
+    ModelGeomAlgo_Point2D::getPointsInsideShape(anAttrShape, aRefAttributes, aC->pnt(),
+                                                aX->dir(), aDirY, aPointsInfo);//aPoints, aPointToAttributes);
+
+    int aCoincidentToFeature = (int)aPointsInfo.size();//aPoints.size();
+    if (aKind == SketchPlugin_Circle::ID())
+      aValid = aCoincidentToFeature >= 2;
+    else
+      aValid = aCoincidentToFeature >= 1;
+  }
+
+  return aValid;
+}
+
+bool SketchPlugin_ProjectionValidator::isValid(const AttributePtr& theAttribute,
+                                               const std::list<std::string>& theArguments,
+                                               Events_InfoMessage& theError) const
+{
+  if (theAttribute->attributeType() != ModelAPI_AttributeSelection::typeId()) {
+    theError = "The attribute with the %1 type is not processed";
+    theError.arg(theAttribute->attributeType());
+    return false;
+  }
+
+  AttributeSelectionPtr aFeatureAttr =
+      std::dynamic_pointer_cast<ModelAPI_AttributeSelection>(theAttribute);
+  std::shared_ptr<GeomAPI_Edge> anEdge;
+  if (aFeatureAttr.get()) {
+    GeomShapePtr aVal = aFeatureAttr->value();
+    ResultPtr aRes = aFeatureAttr->context();
+    if(aFeatureAttr->value() && aFeatureAttr->value()->isEdge()) {
+      anEdge = std::shared_ptr<GeomAPI_Edge>(new GeomAPI_Edge(aFeatureAttr->value()));
+    } else if(aFeatureAttr->context() && aFeatureAttr->context()->shape() &&
+              aFeatureAttr->context()->shape()->isEdge()) {
+      anEdge = std::shared_ptr<GeomAPI_Edge>(new GeomAPI_Edge(aFeatureAttr->context()->shape()));
+    }
+  }
+  if (!anEdge) {
+    theError = "The attribute %1 should be an edge";
+    theError.arg(theAttribute->id());
+    return false;
+  }
+
+  // find a sketch
+  std::shared_ptr<SketchPlugin_Sketch> aSketch;
+  std::set<AttributePtr> aRefs = theAttribute->owner()->data()->refsToMe();
+  std::set<AttributePtr>::const_iterator anIt = aRefs.begin();
+  for (; anIt != aRefs.end(); ++anIt) {
+    CompositeFeaturePtr aComp =
+        std::dynamic_pointer_cast<ModelAPI_CompositeFeature>((*anIt)->owner());
+    if (aComp && aComp->getKind() == SketchPlugin_Sketch::ID()) {
+      aSketch = std::dynamic_pointer_cast<SketchPlugin_Sketch>(aComp);
+      break;
+    }
+  }
+  if (!aSketch) {
+    theError = "There is no sketch referring to the current feature";
+    return false;
+  }
+
+  std::shared_ptr<GeomAPI_Pln> aPlane = aSketch->plane();
+  std::shared_ptr<GeomAPI_Dir> aNormal = aPlane->direction();
+  std::shared_ptr<GeomAPI_Pnt> anOrigin = aPlane->location();
+
+  if (anEdge->isLine()) {
+    std::shared_ptr<GeomAPI_Lin> aLine = anEdge->line();
+    std::shared_ptr<GeomAPI_Dir> aLineDir = aLine->direction();
+    std::shared_ptr<GeomAPI_Pnt> aLineLoc = aLine->location();
+    double aDot = aNormal->dot(aLineDir);
+    double aDist = aLineLoc->xyz()->decreased(anOrigin->xyz())->dot(aNormal->xyz());
+    bool aValid = (fabs(aDot) >= tolerance && fabs(aDot) < 1.0 - tolerance) ||
+           (fabs(aDot) < tolerance && fabs(aDist) > tolerance);
+    if (!aValid)
+      theError = "Error: Edge is already in the sketch plane.";
+    return aValid;
+  }
+  else if (anEdge->isCircle() || anEdge->isArc()) {
+    std::shared_ptr<GeomAPI_Circ> aCircle = anEdge->circle();
+    std::shared_ptr<GeomAPI_Dir> aCircNormal = aCircle->normal();
+    std::shared_ptr<GeomAPI_Pnt> aCircCenter = aCircle->center();
+    double aDot = fabs(aNormal->dot(aCircNormal));
+    double aDist = aCircCenter->xyz()->decreased(anOrigin->xyz())->dot(aNormal->xyz());
+    bool aValid = fabs(aDot - 1.0) < tolerance * tolerance && fabs(aDist) > tolerance;
+    if (!aValid)
+      theError.arg(anEdge->isCircle() ? "Error: Cirlce is already in the sketch plane."
+                                      : "Error: Arc is already in the sketch plane.");
+    return aValid;
+  }
+
+  theError = "Error: Selected object is not line, circle or arc.";
+  return false;
+}