private static void processCallerMethod(
      JavaChangeInfo changeInfo,
      PsiMethod caller,
      PsiMethod baseMethod,
      boolean toInsertParams,
      boolean toInsertThrows)
      throws IncorrectOperationException {
    LOG.assertTrue(toInsertParams || toInsertThrows);
    if (toInsertParams) {
      List<PsiParameter> newParameters = new ArrayList<PsiParameter>();
      ContainerUtil.addAll(newParameters, caller.getParameterList().getParameters());
      final JavaParameterInfo[] primaryNewParms = changeInfo.getNewParameters();
      PsiSubstitutor substitutor =
          baseMethod == null
              ? PsiSubstitutor.EMPTY
              : ChangeSignatureProcessor.calculateSubstitutor(caller, baseMethod);
      for (JavaParameterInfo info : primaryNewParms) {
        if (info.getOldIndex() < 0)
          newParameters.add(createNewParameter(changeInfo, info, substitutor));
      }
      PsiParameter[] arrayed = newParameters.toArray(new PsiParameter[newParameters.size()]);
      boolean[] toRemoveParm = new boolean[arrayed.length];
      Arrays.fill(toRemoveParm, false);
      resolveParameterVsFieldsConflicts(arrayed, caller, caller.getParameterList(), toRemoveParm);
    }

    if (toInsertThrows) {
      List<PsiJavaCodeReferenceElement> newThrowns = new ArrayList<PsiJavaCodeReferenceElement>();
      final PsiReferenceList throwsList = caller.getThrowsList();
      ContainerUtil.addAll(newThrowns, throwsList.getReferenceElements());
      final ThrownExceptionInfo[] primaryNewExns = changeInfo.getNewExceptions();
      for (ThrownExceptionInfo thrownExceptionInfo : primaryNewExns) {
        if (thrownExceptionInfo.getOldIndex() < 0) {
          final PsiClassType type =
              (PsiClassType) thrownExceptionInfo.createType(caller, caller.getManager());
          final PsiJavaCodeReferenceElement ref =
              JavaPsiFacade.getInstance(caller.getProject())
                  .getElementFactory()
                  .createReferenceElementByType(type);
          newThrowns.add(ref);
        }
      }
      PsiJavaCodeReferenceElement[] arrayed =
          newThrowns.toArray(new PsiJavaCodeReferenceElement[newThrowns.size()]);
      boolean[] toRemoveParm = new boolean[arrayed.length];
      Arrays.fill(toRemoveParm, false);
      ChangeSignatureUtil.synchronizeList(
          throwsList, Arrays.asList(arrayed), ThrowsList.INSTANCE, toRemoveParm);
    }
  }
 private static void resolveParameterVsFieldsConflicts(
     final PsiParameter[] newParms,
     final PsiMethod method,
     final PsiParameterList list,
     boolean[] toRemoveParm)
     throws IncorrectOperationException {
   List<FieldConflictsResolver> conflictResolvers = new ArrayList<FieldConflictsResolver>();
   for (PsiParameter parameter : newParms) {
     conflictResolvers.add(new FieldConflictsResolver(parameter.getName(), method.getBody()));
   }
   ChangeSignatureUtil.synchronizeList(
       list, Arrays.asList(newParms), ParameterList.INSTANCE, toRemoveParm);
   JavaCodeStyleManager.getInstance(list.getProject()).shortenClassReferences(list);
   for (FieldConflictsResolver fieldConflictsResolver : conflictResolvers) {
     fieldConflictsResolver.fix();
   }
 }
  // This methods works equally well for primary usages as well as for propagated callers' usages
  private static void fixActualArgumentsList(
      PsiExpressionList list,
      JavaChangeInfo changeInfo,
      boolean toInsertDefaultValue,
      PsiSubstitutor substitutor)
      throws IncorrectOperationException {
    final PsiElementFactory factory =
        JavaPsiFacade.getInstance(list.getProject()).getElementFactory();
    if (changeInfo.isParameterSetOrOrderChanged()) {
      if (changeInfo instanceof JavaChangeInfoImpl
          && ((JavaChangeInfoImpl) changeInfo).isPropagationEnabled) {
        final ParameterInfoImpl[] createdParmsInfo =
            ((JavaChangeInfoImpl) changeInfo).getCreatedParmsInfoWithoutVarargs();
        for (ParameterInfoImpl info : createdParmsInfo) {
          PsiExpression newArg;
          if (toInsertDefaultValue) {
            newArg = createDefaultValue(changeInfo, factory, info, list);
          } else {
            newArg = factory.createExpressionFromText(info.getName(), list);
          }
          JavaCodeStyleManager.getInstance(list.getProject())
              .shortenClassReferences(list.add(newArg));
        }
      } else {
        final PsiExpression[] args = list.getExpressions();
        final int nonVarargCount = getNonVarargCount(changeInfo, args);
        final int varargCount = args.length - nonVarargCount;
        if (varargCount < 0) return;
        PsiExpression[] newVarargInitializers = null;

        final int newArgsLength;
        final int newNonVarargCount;
        final JavaParameterInfo[] newParms = changeInfo.getNewParameters();
        if (changeInfo.isArrayToVarargs()) {
          newNonVarargCount = newParms.length - 1;
          final JavaParameterInfo lastNewParm = newParms[newParms.length - 1];
          final PsiExpression arrayToConvert = args[lastNewParm.getOldIndex()];
          if (arrayToConvert instanceof PsiNewExpression) {
            final PsiNewExpression expression = (PsiNewExpression) arrayToConvert;
            final PsiArrayInitializerExpression arrayInitializer = expression.getArrayInitializer();
            if (arrayInitializer != null) {
              newVarargInitializers = arrayInitializer.getInitializers();
            }
          }
          newArgsLength =
              newVarargInitializers == null
                  ? newParms.length
                  : newNonVarargCount + newVarargInitializers.length;
        } else if (changeInfo.isRetainsVarargs()) {
          newNonVarargCount = newParms.length - 1;
          newArgsLength = newNonVarargCount + varargCount;
        } else if (changeInfo.isObtainsVarags()) {
          newNonVarargCount = newParms.length - 1;
          newArgsLength = newNonVarargCount;
        } else {
          newNonVarargCount = newParms.length;
          newArgsLength = newParms.length;
        }

        String[] oldVarargs = null;
        if (changeInfo.wasVararg() && !changeInfo.isRetainsVarargs()) {
          oldVarargs = new String[varargCount];
          for (int i = nonVarargCount; i < args.length; i++) {
            oldVarargs[i - nonVarargCount] = args[i].getText();
          }
        }

        final PsiExpression[] newArgs = new PsiExpression[newArgsLength];
        for (int i = 0; i < newNonVarargCount; i++) {
          if (newParms[i].getOldIndex() == nonVarargCount && oldVarargs != null) {
            PsiType type = newParms[i].createType(changeInfo.getMethod(), list.getManager());
            if (type instanceof PsiArrayType) {
              type = substitutor.substitute(type);
              type = TypeConversionUtil.erasure(type);
              String typeText = type.getCanonicalText();
              if (type instanceof PsiEllipsisType) {
                typeText = typeText.replace("...", "[]");
              }
              String text = "new " + typeText + "{" + StringUtil.join(oldVarargs, ",") + "}";
              newArgs[i] = factory.createExpressionFromText(text, changeInfo.getMethod());
              continue;
            }
          }
          newArgs[i] =
              createActualArgument(changeInfo, list, newParms[i], toInsertDefaultValue, args);
        }
        if (changeInfo.isArrayToVarargs()) {
          if (newVarargInitializers == null) {
            newArgs[newNonVarargCount] =
                createActualArgument(
                    changeInfo, list, newParms[newNonVarargCount], toInsertDefaultValue, args);
          } else {
            System.arraycopy(
                newVarargInitializers, 0, newArgs, newNonVarargCount, newVarargInitializers.length);
          }
        } else {
          final int newVarargCount = newArgsLength - newNonVarargCount;
          LOG.assertTrue(newVarargCount == 0 || newVarargCount == varargCount);
          for (int i = newNonVarargCount; i < newArgsLength; i++) {
            final int oldIndex = newParms[newNonVarargCount].getOldIndex();
            if (oldIndex >= 0 && oldIndex != nonVarargCount) {
              newArgs[i] =
                  createActualArgument(
                      changeInfo, list, newParms[newNonVarargCount], toInsertDefaultValue, args);
            } else {
              System.arraycopy(args, nonVarargCount, newArgs, newNonVarargCount, newVarargCount);
              break;
            }
          }
        }
        ChangeSignatureUtil.synchronizeList(
            list, Arrays.asList(newArgs), ExpressionList.INSTANCE, changeInfo.toRemoveParm());
      }
    }
  }