private void generateAccessors() {
    // generate accessors
    myNameToGetter = new HashMap<String, PsiMethod>();
    myNameToSetter = new HashMap<String, PsiMethod>();

    for (FieldDescriptor fieldDescriptor : myFieldDescriptors) {
      final DocCommentPolicy<PsiDocComment> commentPolicy =
          new DocCommentPolicy<PsiDocComment>(myDescriptor.getJavadocPolicy());

      PsiField field = fieldDescriptor.getField();
      final PsiDocComment docComment = field.getDocComment();
      if (myDescriptor.isToEncapsulateGet()) {
        final PsiMethod prototype = fieldDescriptor.getGetterPrototype();
        assert prototype != null;
        final PsiMethod getter = addOrChangeAccessor(prototype, myNameToGetter);
        if (docComment != null) {
          final PsiDocComment getterJavadoc =
              (PsiDocComment) getter.addBefore(docComment, getter.getFirstChild());
          commentPolicy.processNewJavaDoc(getterJavadoc);
        }
      }
      if (myDescriptor.isToEncapsulateSet() && !field.hasModifierProperty(PsiModifier.FINAL)) {
        PsiMethod prototype = fieldDescriptor.getSetterPrototype();
        assert prototype != null;
        addOrChangeAccessor(prototype, myNameToSetter);
      }

      if (docComment != null) {
        commentPolicy.processOldJavaDoc(docComment);
      }
    }
  }
  protected boolean preprocessUsages(Ref<UsageInfo[]> refUsages) {
    final MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();

    checkExistingMethods(conflicts, true);
    checkExistingMethods(conflicts, false);
    final Collection<PsiClass> classes = ClassInheritorsSearch.search(myClass).findAll();
    for (FieldDescriptor fieldDescriptor : myFieldDescriptors) {
      final Set<PsiMethod> setters = new HashSet<PsiMethod>();
      final Set<PsiMethod> getters = new HashSet<PsiMethod>();

      for (PsiClass aClass : classes) {
        final PsiMethod getterOverrider =
            myDescriptor.isToEncapsulateGet()
                ? aClass.findMethodBySignature(fieldDescriptor.getGetterPrototype(), false)
                : null;
        if (getterOverrider != null) {
          getters.add(getterOverrider);
        }
        final PsiMethod setterOverrider =
            myDescriptor.isToEncapsulateSet()
                ? aClass.findMethodBySignature(fieldDescriptor.getSetterPrototype(), false)
                : null;
        if (setterOverrider != null) {
          setters.add(setterOverrider);
        }
      }
      if (!getters.isEmpty() || !setters.isEmpty()) {
        final PsiField field = fieldDescriptor.getField();
        for (PsiReference reference : ReferencesSearch.search(field)) {
          final PsiElement place = reference.getElement();
          if (place instanceof PsiReferenceExpression) {
            final PsiExpression qualifierExpression =
                ((PsiReferenceExpression) place).getQualifierExpression();
            final PsiClass ancestor;
            if (qualifierExpression == null) {
              ancestor = PsiTreeUtil.getParentOfType(place, PsiClass.class, false);
            } else {
              ancestor = PsiUtil.resolveClassInType(qualifierExpression.getType());
            }

            final boolean isGetter = !PsiUtil.isAccessedForWriting((PsiExpression) place);
            for (PsiMethod overridden : isGetter ? getters : setters) {
              if (InheritanceUtil.isInheritorOrSelf(myClass, ancestor, true)) {
                conflicts.putValue(
                    overridden,
                    "There is already a "
                        + RefactoringUIUtil.getDescription(overridden, true)
                        + " which would hide generated "
                        + (isGetter ? "getter" : "setter")
                        + " for "
                        + place.getText());
                break;
              }
            }
          }
        }
      }
    }
    return showConflicts(conflicts, refUsages.get());
  }
  private void updateFieldVisibility() {
    if (myDescriptor.getFieldsVisibility() == null) return;

    for (FieldDescriptor descriptor : myFieldDescriptors) {
      setNewFieldVisibility(descriptor.getField(), myDescriptor);
    }
  }
 @Nullable
 @Override
 protected RefactoringEventData getBeforeData() {
   RefactoringEventData data = new RefactoringEventData();
   final List<PsiElement> fields = new ArrayList<PsiElement>();
   for (FieldDescriptor fieldDescriptor : myFieldDescriptors) {
     fields.add(fieldDescriptor.getField());
   }
   data.addElements(fields);
   return data;
 }
  @Nullable
  public EncapsulateFieldUsageInfo createUsage(
      @NotNull EncapsulateFieldsDescriptor descriptor,
      @NotNull FieldDescriptor fieldDescriptor,
      @NotNull PsiReference reference) {
    if (!(reference instanceof PsiReferenceExpression)) return null;

    boolean findSet = descriptor.isToEncapsulateSet();
    boolean findGet = descriptor.isToEncapsulateGet();
    PsiReferenceExpression ref = (PsiReferenceExpression) reference;
    // [Jeka] to avoid recursion in the field's accessors
    if (findGet
        && isUsedInExistingAccessor(
            descriptor.getTargetClass(), fieldDescriptor.getGetterPrototype(), ref)) return null;
    if (findSet
        && isUsedInExistingAccessor(
            descriptor.getTargetClass(), fieldDescriptor.getSetterPrototype(), ref)) return null;
    if (!findGet) {
      if (!PsiUtil.isAccessedForWriting(ref)) return null;
    }
    if (!findSet || fieldDescriptor.getField().hasModifierProperty(PsiModifier.FINAL)) {
      if (!PsiUtil.isAccessedForReading(ref)) return null;
    }
    if (!descriptor.isToUseAccessorsWhenAccessible()) {
      PsiModifierList newModifierList = createNewModifierList(descriptor);

      PsiClass accessObjectClass = null;
      PsiExpression qualifier = ref.getQualifierExpression();
      if (qualifier != null) {
        accessObjectClass = (PsiClass) PsiUtil.getAccessObjectClass(qualifier).getElement();
      }
      final PsiResolveHelper helper =
          JavaPsiFacade.getInstance(((PsiReferenceExpression) reference).getProject())
              .getResolveHelper();
      if (helper.isAccessible(
          fieldDescriptor.getField(), newModifierList, ref, accessObjectClass, null)) {
        return null;
      }
    }
    return new EncapsulateFieldUsageInfo(ref, fieldDescriptor);
  }
 @Nullable
 private static PsiMethodCallExpression createGetterCall(
     FieldDescriptor fieldDescriptor,
     PsiReferenceExpression expr,
     PsiClass aClass,
     PsiMethod getter)
     throws IncorrectOperationException {
   final String getterName = fieldDescriptor.getGetterName();
   @NonNls String text = getterName + "()";
   PsiMethodCallExpression methodCall = prepareMethodCall(expr, text);
   methodCall = checkMethodResolvable(methodCall, getter, expr, aClass);
   if (methodCall == null) {
     VisibilityUtil.escalateVisibility(fieldDescriptor.getField(), expr);
   }
   return methodCall;
 }
 private static PsiMethodCallExpression createSetterCall(
     FieldDescriptor fieldDescriptor,
     PsiExpression setterArgument,
     PsiReferenceExpression expr,
     PsiClass aClass,
     PsiMethod setter)
     throws IncorrectOperationException {
   final String setterName = fieldDescriptor.getSetterName();
   @NonNls String text = setterName + "(a)";
   PsiMethodCallExpression methodCall = prepareMethodCall(expr, text);
   methodCall.getArgumentList().getExpressions()[0].replace(setterArgument);
   methodCall = checkMethodResolvable(methodCall, setter, expr, aClass);
   if (methodCall == null) {
     VisibilityUtil.escalateVisibility(fieldDescriptor.getField(), expr);
   }
   return methodCall;
 }
  @NotNull
  protected UsageInfo[] findUsages() {
    ArrayList<EncapsulateFieldUsageInfo> array = ContainerUtil.newArrayList();
    for (FieldDescriptor fieldDescriptor : myFieldDescriptors) {
      for (final PsiReference reference : ReferencesSearch.search(fieldDescriptor.getField())) {
        final PsiElement element = reference.getElement();
        if (element == null) continue;

        final EncapsulateFieldHelper helper =
            EncapsulateFieldHelper.getHelper(element.getLanguage());
        if (helper != null) {
          EncapsulateFieldUsageInfo usageInfo =
              helper.createUsage(myDescriptor, fieldDescriptor, reference);
          if (usageInfo != null) {
            array.add(usageInfo);
          }
        }
      }
    }
    EncapsulateFieldUsageInfo[] usageInfos =
        array.toArray(new EncapsulateFieldUsageInfo[array.size()]);
    return UsageViewUtil.removeDuplicatedUsages(usageInfos);
  }
  public boolean processUsage(
      @NotNull EncapsulateFieldUsageInfo usage,
      @NotNull EncapsulateFieldsDescriptor descriptor,
      PsiMethod setter,
      PsiMethod getter) {
    final PsiElement element = usage.getElement();
    if (!(element instanceof PsiReferenceExpression)) return false;

    final FieldDescriptor fieldDescriptor = usage.getFieldDescriptor();
    PsiField field = fieldDescriptor.getField();
    boolean processGet = descriptor.isToEncapsulateGet();
    boolean processSet =
        descriptor.isToEncapsulateSet() && !field.hasModifierProperty(PsiModifier.FINAL);
    if (!processGet && !processSet) return true;
    PsiElementFactory factory =
        JavaPsiFacade.getInstance(descriptor.getTargetClass().getProject()).getElementFactory();

    try {
      final PsiReferenceExpression expr = (PsiReferenceExpression) element;
      final PsiElement parent = expr.getParent();
      if (parent instanceof PsiAssignmentExpression
          && expr.equals(((PsiAssignmentExpression) parent).getLExpression())) {
        PsiAssignmentExpression assignment = (PsiAssignmentExpression) parent;
        if (assignment.getRExpression() == null) return true;
        PsiJavaToken opSign = assignment.getOperationSign();
        IElementType opType = opSign.getTokenType();
        if (opType == JavaTokenType.EQ) {
          {
            if (!processSet) return true;
            final PsiExpression setterArgument = assignment.getRExpression();

            PsiMethodCallExpression methodCall =
                createSetterCall(
                    fieldDescriptor, setterArgument, expr, descriptor.getTargetClass(), setter);

            if (methodCall != null) {
              assignment.replace(methodCall);
            }
            // TODO: check if value is used!!!
          }
        } else if (opType == JavaTokenType.ASTERISKEQ
            || opType == JavaTokenType.DIVEQ
            || opType == JavaTokenType.PERCEQ
            || opType == JavaTokenType.PLUSEQ
            || opType == JavaTokenType.MINUSEQ
            || opType == JavaTokenType.LTLTEQ
            || opType == JavaTokenType.GTGTEQ
            || opType == JavaTokenType.GTGTGTEQ
            || opType == JavaTokenType.ANDEQ
            || opType == JavaTokenType.OREQ
            || opType == JavaTokenType.XOREQ) {
          {
            // Q: side effects of qualifier??!

            String opName = opSign.getText();
            LOG.assertTrue(StringUtil.endsWithChar(opName, '='));
            opName = opName.substring(0, opName.length() - 1);

            PsiExpression getExpr = expr;
            if (processGet) {
              final PsiMethodCallExpression getterCall =
                  createGetterCall(fieldDescriptor, expr, descriptor.getTargetClass(), getter);
              if (getterCall != null) {
                getExpr = getterCall;
              }
            }

            @NonNls String text = "a" + opName + "b";
            PsiBinaryExpression binExpr =
                (PsiBinaryExpression) factory.createExpressionFromText(text, expr);
            binExpr.getLOperand().replace(getExpr);
            binExpr.getROperand().replace(assignment.getRExpression());

            PsiExpression setExpr;
            if (processSet) {
              setExpr =
                  createSetterCall(
                      fieldDescriptor, binExpr, expr, descriptor.getTargetClass(), setter);
            } else {
              text = "a = b";
              PsiAssignmentExpression assignment1 =
                  (PsiAssignmentExpression) factory.createExpressionFromText(text, null);
              assignment1.getLExpression().replace(expr);
              assignment1.getRExpression().replace(binExpr);
              setExpr = assignment1;
            }

            assignment.replace(setExpr);
            // TODO: check if value is used!!!
          }
        }
      } else if (RefactoringUtil.isPlusPlusOrMinusMinus(parent)) {
        IElementType sign;
        if (parent instanceof PsiPrefixExpression) {
          sign = ((PsiPrefixExpression) parent).getOperationTokenType();
        } else {
          sign = ((PsiPostfixExpression) parent).getOperationTokenType();
        }

        PsiExpression getExpr = expr;
        if (processGet) {
          final PsiMethodCallExpression getterCall =
              createGetterCall(fieldDescriptor, expr, descriptor.getTargetClass(), getter);
          if (getterCall != null) {
            getExpr = getterCall;
          }
        }

        @NonNls String text;
        if (sign == JavaTokenType.PLUSPLUS) {
          text = "a+1";
        } else {
          text = "a-1";
        }
        PsiBinaryExpression binExpr =
            (PsiBinaryExpression) factory.createExpressionFromText(text, null);
        binExpr.getLOperand().replace(getExpr);

        PsiExpression setExpr;
        if (processSet) {
          setExpr =
              createSetterCall(fieldDescriptor, binExpr, expr, descriptor.getTargetClass(), setter);
        } else {
          text = "a = b";
          PsiAssignmentExpression assignment =
              (PsiAssignmentExpression) factory.createExpressionFromText(text, null);
          assignment.getLExpression().replace(expr);
          assignment.getRExpression().replace(binExpr);
          setExpr = assignment;
        }
        parent.replace(setExpr);
      } else {
        if (!processGet) return true;
        PsiMethodCallExpression methodCall =
            createGetterCall(fieldDescriptor, expr, descriptor.getTargetClass(), getter);

        if (methodCall != null) {
          expr.replace(methodCall);
        }
      }
    } catch (IncorrectOperationException e) {
      LOG.error(e);
    }
    return true;
  }