@Nullable
 private static String verifyDestinationForElement(
     final PsiElement element, final MoveDestination moveDestination) {
   final String message;
   if (element instanceof PsiDirectory) {
     message = moveDestination.verify((PsiDirectory) element);
   } else if (element instanceof PsiPackage) {
     message = moveDestination.verify((PsiPackage) element);
   } else {
     message = moveDestination.verify(element.getContainingFile());
   }
   return message;
 }
  private void invokeMoveToPackage() {
    final MoveDestination destination = selectDestination();
    if (destination == null) return;

    saveRefactoringSettings();
    for (final PsiElement element : myElementsToMove) {
      String message = verifyDestinationForElement(element, destination);
      if (message != null) {
        String helpId = HelpID.getMoveHelpID(myElementsToMove[0]);
        CommonRefactoringUtil.showErrorMessage(
            RefactoringBundle.message("error.title"), message, helpId, getProject());
        return;
      }
    }
    try {
      for (PsiElement element : myElementsToMove) {
        if (element instanceof PsiClass) {
          final PsiClass aClass = (PsiClass) element;
          LOG.assertTrue(aClass.isPhysical(), aClass);
          /*PsiElement toAdd;
          if (aClass.getContainingFile() instanceof PsiJavaFile && ((PsiJavaFile)aClass.getContainingFile()).getClasses().length > 1) {
            toAdd = aClass;
          }
          else {
            toAdd = aClass.getContainingFile();
          }*/

          final PsiDirectory targetDirectory =
              destination.getTargetIfExists(element.getContainingFile());
          if (targetDirectory != null) {
            MoveFilesOrDirectoriesUtil.checkMove(aClass, targetDirectory);
          }
        }
      }

      MoveClassesOrPackagesProcessor processor =
          createMoveToPackageProcessor(destination, myElementsToMove, myMoveCallback);
      if (processor.verifyValidPackageName()) {
        processor.setOpenInEditor(isOpenInEditor());
        invokeRefactoring(processor);
      }
    } catch (IncorrectOperationException e) {
      String helpId = HelpID.getMoveHelpID(myElementsToMove[0]);
      CommonRefactoringUtil.showErrorMessage(
          RefactoringBundle.message("error.title"), e.getMessage(), helpId, getProject());
    }
  }
 @Override
 protected boolean preprocessUsages(@NotNull final Ref<UsageInfo[]> refUsages) {
   MultiMap<PsiElement, String> conflicts = new MultiMap<PsiElement, String>();
   if (myUseExistingClass) {
     if (existingClass == null) {
       conflicts.putValue(
           null,
           RefactorJBundle.message("cannot.perform.the.refactoring")
               + "Could not find the selected class");
     }
     if (myExistingClassCompatibleConstructor == null) {
       conflicts.putValue(
           existingClass,
           RefactorJBundle.message("cannot.perform.the.refactoring")
               + "Selected class has no compatible constructors");
     }
   } else {
     if (existingClass != null) {
       conflicts.putValue(
           existingClass,
           RefactorJBundle.message("cannot.perform.the.refactoring")
               + RefactorJBundle.message("there.already.exists.a.class.with.the.chosen.name"));
     }
     if (myMoveDestination != null) {
       if (!myMoveDestination.isTargetAccessible(
           myProject, method.getContainingFile().getVirtualFile())) {
         conflicts.putValue(method, "Created class won't be accessible");
       }
     }
   }
   for (UsageInfo usageInfo : refUsages.get()) {
     if (usageInfo instanceof FixableUsageInfo) {
       final String conflictMessage = ((FixableUsageInfo) usageInfo).getConflictMessage();
       if (conflictMessage != null) {
         conflicts.putValue(usageInfo.getElement(), conflictMessage);
       }
     }
   }
   return showConflicts(conflicts, refUsages.get());
 }
  private PsiClass buildClass() {
    if (existingClass != null) {
      return existingClass;
    }
    final ParameterObjectBuilder beanClassBuilder = new ParameterObjectBuilder();
    beanClassBuilder.setVisibility(myCreateInnerClass ? PsiModifier.PRIVATE : PsiModifier.PUBLIC);
    beanClassBuilder.setProject(myProject);
    beanClassBuilder.setTypeArguments(typeParams);
    beanClassBuilder.setClassName(className);
    beanClassBuilder.setPackageName(packageName);
    for (ParameterChunk parameterChunk : parameters) {
      final VariableData parameter = parameterChunk.parameter;
      final boolean setterRequired = paramsNeedingSetters.contains(parameter.variable);
      beanClassBuilder.addField(
          (PsiParameter) parameter.variable, parameter.name, parameter.type, setterRequired);
    }
    final String classString = beanClassBuilder.buildBeanClass();

    try {
      final PsiFileFactory factory = PsiFileFactory.getInstance(method.getProject());
      final PsiJavaFile newFile =
          (PsiJavaFile)
              factory.createFileFromText(className + ".java", JavaFileType.INSTANCE, classString);
      if (myCreateInnerClass) {
        final PsiClass containingClass = method.getContainingClass();
        final PsiClass[] classes = newFile.getClasses();
        assert classes.length > 0 : classString;
        final PsiClass innerClass = (PsiClass) containingClass.add(classes[0]);
        PsiUtil.setModifierProperty(innerClass, PsiModifier.STATIC, true);
        return (PsiClass)
            JavaCodeStyleManager.getInstance(newFile.getProject())
                .shortenClassReferences(innerClass);
      } else {
        final PsiFile containingFile = method.getContainingFile();
        final PsiDirectory containingDirectory = containingFile.getContainingDirectory();
        final PsiDirectory directory;
        if (myMoveDestination != null) {
          directory = myMoveDestination.getTargetDirectory(containingDirectory);
        } else {
          final Module module = ModuleUtil.findModuleForPsiElement(containingFile);
          directory =
              PackageUtil.findOrCreateDirectoryForPackage(
                  module, packageName, containingDirectory, true, true);
        }

        if (directory != null) {

          final CodeStyleManager codeStyleManager =
              CodeStyleManager.getInstance(method.getManager().getProject());
          final PsiElement shortenedFile =
              JavaCodeStyleManager.getInstance(newFile.getProject())
                  .shortenClassReferences(newFile);
          final PsiElement reformattedFile = codeStyleManager.reformat(shortenedFile);
          return ((PsiJavaFile) directory.add(reformattedFile)).getClasses()[0];
        }
      }
    } catch (IncorrectOperationException e) {
      logger.info(e);
    }
    return null;
  }
  private PsiClass buildClass() {
    final PsiManager manager = sourceClass.getManager();
    final Project project = sourceClass.getProject();
    final ExtractedClassBuilder extractedClassBuilder = new ExtractedClassBuilder();
    extractedClassBuilder.setProject(myProject);
    extractedClassBuilder.setClassName(newClassName);
    extractedClassBuilder.setPackageName(newPackageName);
    extractedClassBuilder.setOriginalClassName(sourceClass.getQualifiedName());
    extractedClassBuilder.setRequiresBackPointer(requiresBackpointer);
    extractedClassBuilder.setExtractAsEnum(enumConstants);
    for (PsiField field : fields) {
      extractedClassBuilder.addField(field);
    }
    for (PsiMethod method : methods) {
      extractedClassBuilder.addMethod(method);
    }
    for (PsiClass innerClass : innerClasses) {
      extractedClassBuilder.addInnerClass(
          innerClass, innerClassesToMakePublic.contains(innerClass));
    }
    extractedClassBuilder.setTypeArguments(typeParams);
    final List<PsiClass> interfaces = calculateInterfacesSupported();
    extractedClassBuilder.setInterfaces(interfaces);

    if (myGenerateAccessors) {
      final NecessaryAccessorsVisitor visitor = checkNecessaryGettersSetters4ExtractedClass();
      sourceClass.accept(visitor);
      extractedClassBuilder.setFieldsNeedingGetters(visitor.getFieldsNeedingGetter());
      extractedClassBuilder.setFieldsNeedingSetters(visitor.getFieldsNeedingSetter());
    }

    final String classString = extractedClassBuilder.buildBeanClass();
    if (extractInnerClass) {
      final PsiFileFactory factory = PsiFileFactory.getInstance(project);
      final PsiJavaFile newFile =
          (PsiJavaFile)
              factory.createFileFromText(
                  newClassName + ".java", JavaFileType.INSTANCE, classString);
      final PsiClass psiClass = newFile.getClasses()[0];
      if (!psiClass.isEnum()) {
        final PsiModifierList modifierList = psiClass.getModifierList();
        assert modifierList != null;
        modifierList.setModifierProperty(PsiModifier.STATIC, true);
      }
      final PsiElement addedClass = sourceClass.add(psiClass);
      return (PsiClass)
          CodeStyleManager.getInstance(manager)
              .reformat(
                  JavaCodeStyleManager.getInstance(project).shortenClassReferences(addedClass));
    }

    try {
      final PsiFile containingFile = sourceClass.getContainingFile();
      final PsiDirectory directory;
      final PsiDirectory containingDirectory = containingFile.getContainingDirectory();
      if (myMoveDestination != null) {
        directory = myMoveDestination.getTargetDirectory(containingDirectory);
      } else {
        final Module module = ModuleUtil.findModuleForPsiElement(containingFile);
        assert module != null;
        directory =
            PackageUtil.findOrCreateDirectoryForPackage(
                module, newPackageName, containingDirectory, false, true);
      }
      if (directory != null) {
        final PsiFileFactory factory = PsiFileFactory.getInstance(project);
        final PsiFile newFile =
            factory.createFileFromText(newClassName + ".java", JavaFileType.INSTANCE, classString);
        final PsiElement addedFile = directory.add(newFile);
        final CodeStyleManager codeStyleManager =
            CodeStyleManager.getInstance(manager.getProject());
        final PsiElement shortenedFile =
            JavaCodeStyleManager.getInstance(project).shortenClassReferences(addedFile);
        return ((PsiJavaFile) codeStyleManager.reformat(shortenedFile)).getClasses()[0];
      } else {
        return null;
      }
    } catch (IncorrectOperationException e) {
      return null;
    }
  }