private static boolean processSubComponent(PsiElementProcessor<HaxeNamedComponent> processor, HaxeComponent component) {
  final String componentName = component.getName();
  if (componentName == null) {
    return true;
  }
  if (!processor.execute(component)) {
    return false;
  }
  if (component instanceof HaxeClass) {
    for (HaxeNamedComponent subComponent : getNamedComponents((HaxeClass)component)) {
      if (!processor.execute(subComponent)) {
        return false;
      }
    }
  }
  return true;
}
 

static void chooseAmbiguousTargetAndPerform(@NotNull final Project project, final Editor editor,
    @NotNull PsiElementProcessor<PsiElement> processor) {
  if (editor == null) {
    Messages.showMessageDialog(project, FindBundle.message("find.no.usages.at.cursor.error"),
        CommonBundle.getErrorTitle(), Messages.getErrorIcon());
  } else {
    int offset = editor.getCaretModel().getOffset();
    boolean chosen = GotoDeclarationAction.chooseAmbiguousTarget(editor, offset, processor,
        FindBundle.message("find.usages.ambiguous.title", "crap"), null);
    if (!chosen) {
      ApplicationManager.getApplication().invokeLater(new Runnable() {
        @Override
        public void run() {
          if (editor.isDisposed() || !editor.getComponent().isShowing()) return;
          HintManager.getInstance()
              .showErrorHint(editor, FindBundle.message("find.no.usages.at.cursor.error"));
        }
      }, project.getDisposed());
    }
  }
}
 

/**
 * Recursive (depth first) search for first element of any of given {@code classes}.
 *
 * @param element a PSI element to start search from.
 * @param strict  if false the {@code element} is also included in the search.
 * @param classes element types to search for.
 * @param <T>     type to cast found element to.
 * @return first found element, or null if nothing found.
 */
@Nullable
@Contract("null, _, _ -> null")
public static <T extends PsiElement> T findChildOfAnyType(@Nullable final PsiElement element, final boolean strict, @Nonnull final Class<? extends T>... classes) {
  PsiElementProcessor.FindElement<PsiElement> processor = new PsiElementProcessor.FindElement<PsiElement>() {
    @Override
    public boolean execute(@Nonnull PsiElement each) {
      if (strict && each == element) return true;
      if (instanceOf(each, classes)) {
        return setFound(each);
      }
      return true;
    }
  };

  processElements(element, processor);
  //noinspection unchecked
  return (T)processor.getFoundElement();
}
 

@Nonnull
public static <T extends PsiElement> Collection<T> findChildrenOfAnyType(@Nullable final PsiElement element, @Nonnull final Class<? extends T>... classes) {
  if (element == null) {
    return ContainerUtil.emptyList();
  }

  PsiElementProcessor.CollectElements<T> processor = new PsiElementProcessor.CollectElements<T>() {
    @Override
    public boolean execute(@Nonnull T each) {
      if (each == element) return true;
      if (instanceOf(each, classes)) {
        return super.execute(each);
      }
      return true;
    }
  };
  processElements(element, processor);
  return processor.getCollection();
}
 

@Override
public boolean processChildren(PsiElementProcessor<PsiFileSystemItem> processor) {
  checkValid();
  ProgressIndicatorProvider.checkCanceled();

  for (VirtualFile vFile : myFile.getChildren()) {
    boolean isDir = vFile.isDirectory();
    if (processor instanceof PsiFileSystemItemProcessor && !((PsiFileSystemItemProcessor)processor).acceptItem(vFile.getName(), isDir)) {
      continue;
    }
    if (isDir) {
      PsiDirectory dir = myManager.findDirectory(vFile);
      if (dir != null) {
        if (!processor.execute(dir)) return false;
      }
    }
    else {
      PsiFile file = myManager.findFile(vFile);
      if (file != null) {
        if (!processor.execute(file)) return false;
      }
    }
  }
  return true;
}
 

@Override
@Nonnull
public PsiElement[] getChildren() {
  checkValid();

  VirtualFile[] files = myFile.getChildren();
  final ArrayList<PsiElement> children = new ArrayList<PsiElement>(files.length);
  processChildren(new PsiElementProcessor<PsiFileSystemItem>() {
    @Override
    public boolean execute(@Nonnull final PsiFileSystemItem element) {
      children.add(element);
      return true;
    }
  });

  return PsiUtilCore.toPsiElementArray(children);
}
 

static void chooseAmbiguousTargetAndPerform(@Nonnull final Project project, final Editor editor, @Nonnull PsiElementProcessor<PsiElement> processor) {
  if (editor == null) {
    Messages.showMessageDialog(project, FindBundle.message("find.no.usages.at.cursor.error"), CommonBundle.getErrorTitle(), Messages.getErrorIcon());
  }
  else {
    int offset = editor.getCaretModel().getOffset();
    boolean chosen = GotoDeclarationAction.chooseAmbiguousTarget(editor, offset, processor, FindBundle.message("find.usages.ambiguous.title"), null);
    if (!chosen) {
      ApplicationManager.getApplication().invokeLater(new Runnable() {
        @Override
        public void run() {
          if (editor.isDisposed() || !editor.getComponent().isShowing()) return;
          HintManager.getInstance().showErrorHint(editor, FindBundle.message("find.no.usages.at.cursor.error"));
        }
      }, project.getDisposed());
    }
  }
}
 

static void chooseAmbiguousTargetAndPerform(@NotNull final Project project,
    final Editor editor,
    @NotNull PsiElementProcessor<PsiElement> processor) {
  if (editor == null) {
    Messages.showMessageDialog(project, FindBundle.message("find.no.usages.at.cursor.error"),
        CommonBundle.getErrorTitle(), Messages.getErrorIcon());
  }
  else {
    int offset = editor.getCaretModel().getOffset();
    boolean chosen = GotoDeclarationAction.chooseAmbiguousTarget(editor, offset, processor,
        FindBundle.message("find.usages.ambiguous.title", "crap"), null);
    if (!chosen) {
      ApplicationManager.getApplication().invokeLater(new Runnable() {
        @Override
        public void run() {
          if (editor.isDisposed() || !editor.getComponent().isShowing()) return;
          HintManager.getInstance().showErrorHint(editor, FindBundle.message("find.no.usages.at.cursor.error"));
        }
      }, project.getDisposed());
    }
  }
}
 

@Override
protected void
buildLanguageFoldRegions(@NotNull final List<FoldingDescriptor> descriptors,
                                        @NotNull PsiElement root,
                                        @NotNull Document document,
                                        boolean quick) {
    if (!(root instanceof HaskellFile)) return;
    HaskellFile file = (HaskellFile) root;
    final Set<PsiElement> seenComments = ContainerUtil.newHashSet();

    if (!quick) {
        PsiTreeUtil.processElements(file, new PsiElementProcessor() {
            @Override
            public boolean execute(@NotNull PsiElement element) {
                if (element.getNode().getElementType().equals(HaskellTypes.COMMENT)) {
                    addCommentFolds((PsiComment) element, seenComments, descriptors);
                } else if (HaskellParserDefinition.COMMENTS.contains(element.getNode().getElementType())) {
                    TextRange range = element.getTextRange();
                    String placeholderText = getPlaceholderText(element.getNode());
                    // Only fold if we actually save space to prevent
                    // assertions from kicking in. Means {- -} will not fold.
                    if (placeholderText != null && range.getLength() > 1 &&
                            range.getLength() > placeholderText.length()) {
                        descriptors.add(new FoldingDescriptor(element, range));
                    }
                }
                return true;
            }
        });
    }
}
 

public static List<PsiFile> findLayoutFilesInsideMethod(PsiMethod psiMethod) {
    final List<PsiFile> xmlFiles = new ArrayList<PsiFile>();

    PsiTreeUtil.processElements(psiMethod, new PsiElementProcessor() {

        @Override
        public boolean execute(@NotNull PsiElement element) {

            if (element instanceof PsiMethodCallExpression) {
                PsiMethod psiMethodResolved = ((PsiMethodCallExpression) element).resolveMethod();
                if (psiMethodResolved != null) {
                    String methodName = psiMethodResolved.getName();
                    // @TODO: implement instance check
                    if ("setContentView".equals(methodName)) {
                        PsiExpression[] expressions = ((PsiMethodCallExpression) element).getArgumentList().getExpressions();
                        if (expressions.length > 0 && expressions[0] instanceof PsiReferenceExpression) {
                            PsiFile xmlFile = AndroidUtils.findXmlResource((PsiReferenceExpression) expressions[0]);
                            if (xmlFile != null) {
                                xmlFiles.add(xmlFile);
                            }
                        }

                    }

                }

            }

            return true;
        }
    });


    return xmlFiles;
}
 

@Override
public void invoke(@NotNull final Project project, final Editor editor, PsiFile file) throws IncorrectOperationException {
  if (candidates.size() > 1) {
    NavigationUtil.getPsiElementPopup(
      candidates.toArray(new PsiElement[candidates.size()]),
      new DefaultPsiElementCellRenderer(),
      HaxeBundle.message("choose.class.to.import.title"),
      new PsiElementProcessor<PsiElement>() {
        public boolean execute(@NotNull final PsiElement element) {
          CommandProcessor.getInstance().executeCommand(
            project,
            new Runnable() {
              public void run() {
                doImport(editor, element);
              }
            },
            getClass().getName(),
            this
          );
          return false;
        }
      }
    ).showInBestPositionFor(editor);
  }
  else {
    doImport(editor, candidates.iterator().next());
  }
}
 

private static void processComponents(PsiFile psiFile, PsiElementProcessor<HaxeNamedComponent> processor) {
  // top-level components
  final List<HaxeClass> classes = HaxeResolveUtil.findComponentDeclarations(psiFile);
  for (HaxeClass cls : classes) {
    if (!processSubComponent(processor, cls)) {
      return;
    }
  }
}
 

public static boolean processElements(@Nonnull PsiElementProcessor processor, @Nullable PsiElement... elements) {
  if (elements == null || elements.length == 0) return true;
  for (PsiElement element : elements) {
    if (!processElements(element, processor)) return false;
  }
  return true;
}
 

protected static boolean processFileSystemItem(PsiElementProcessor<PsiFileSystemItem> processor, PsiFileSystemItem element) {
  if (processor instanceof PsiFileSystemItemProcessor && !((PsiFileSystemItemProcessor)processor).acceptItem(element.getName(), true)) {
    return true;
  }

  return processor.execute(element);
}
 

@Override
@Nonnull
public PsiElement[] getChildren() {
  final PsiElementProcessor.CollectElements<PsiFileSystemItem> collector = new PsiElementProcessor.CollectElements<PsiFileSystemItem>();
  processChildren(collector);
  return collector.toArray(new PsiFileSystemItem[0]);
}
 

@Nonnull
public static JBPopup getPsiElementPopup(@Nonnull PsiElement[] elements, @Nonnull final PsiElementListCellRenderer<PsiElement> renderer, final String title) {
  return getPsiElementPopup(elements, renderer, title, new PsiElementProcessor<PsiElement>() {
    @Override
    public boolean execute(@Nonnull final PsiElement element) {
      Navigatable descriptor = EditSourceUtil.getDescriptor(element);
      if (descriptor != null && descriptor.canNavigate()) {
        descriptor.navigate(true);
      }
      return true;
    }
  });
}
 

@Nonnull
public static <T extends PsiElement> JBPopup getPsiElementPopup(@Nonnull T[] elements,
                                                                @Nonnull final PsiElementListCellRenderer<T> renderer,
                                                                final String title,
                                                                @Nonnull final PsiElementProcessor<T> processor) {
  return getPsiElementPopup(elements, renderer, title, processor, null);
}
 

private static void chooseAmbiguousTarget(final Editor editor, int offset, PsiElement[] elements, @Nullable PsiElementListCellRenderer<PsiElement> render) {
  PsiElementProcessor<PsiElement> navigateProcessor = new PsiElementProcessor<PsiElement>() {
    @Override
    public boolean execute(@Nonnull final PsiElement element) {
      gotoTargetElement(element);
      return true;
    }
  };
  boolean found = chooseAmbiguousTarget(editor, offset, navigateProcessor, CodeInsightBundle.message("declaration.navigation.title"), elements, render);
  if (!found) {
    HintManager.getInstance().showErrorHint(editor, "Cannot find declaration to go to");
  }
}
 

public static boolean chooseAmbiguousTarget(@Nonnull Editor editor,
                                            int offset,
                                            @Nonnull PsiElementProcessor<PsiElement> processor,
                                            @Nonnull String titlePattern,
                                            @Nullable PsiElement[] elements) {
  return chooseAmbiguousTarget(editor, offset, processor, titlePattern, elements, null);
}
 

@Nonnull
static Collection<AbstractTreeNode> getDirectoryChildrenImpl(@Nonnull Project project, @Nullable PsiDirectory directory, @Nonnull ViewSettings settings, @Nonnull PsiFileSystemItemFilter filter) {
  final List<AbstractTreeNode> result = new ArrayList<>();
  PsiElementProcessor<PsiFileSystemItem> processor = new PsiElementProcessor<PsiFileSystemItem>() {
    @Override
    public boolean execute(@Nonnull PsiFileSystemItem element) {
      if (!filter.shouldShow(element)) {
        // skip
      }
      else if (element instanceof PsiDirectory) {
        result.add(new PsiDirectoryNode(project, (PsiDirectory)element, settings, filter) {
          @Override
          public Collection<AbstractTreeNode> getChildrenImpl() {
            //noinspection ConstantConditions
            return getDirectoryChildrenImpl(getProject(), getValue(), getSettings(), getFilter());
          }
        });
      }
      else if (element instanceof PsiFile) {
        result.add(new PsiFileNode(project, (PsiFile)element, settings) {
          @Override
          public Comparable<ExtensionSortKey> getTypeSortKey() {
            PsiFile value = getValue();
            Language language = value == null ? null : value.getLanguage();
            LanguageFileType fileType = language == null ? null : language.getAssociatedFileType();
            return fileType == null ? null : new ExtensionSortKey(fileType.getDefaultExtension());
          }
        });
      }
      return true;
    }
  };

  return AbstractTreeUi.calculateYieldingToWriteAction(() -> {
    if (directory == null || !directory.isValid()) return Collections.emptyList();
    directory.processChildren(processor);
    return result;
  });
}
 

@Override
public boolean processChildren(PsiElementProcessor<PsiFileSystemItem> psiElementProcessor) {
  return false;
}
 

@Override
public void invoke(@NotNull Project project, Editor editor, PsiFile psiFile) throws IncorrectOperationException {

    DocumentUtil.writeInRunUndoTransparentAction(new Runnable() {
        @Override
        public void run() {
            List<AndroidView> androidViews = AndroidUtils.getIDsFromXML(xmlFile);

            PsiStatement psiStatement = PsiTreeUtil.getParentOfType(psiElement, PsiStatement.class);
            if(psiStatement == null) {
                return;
            }

            // collection class field
            // check if we need to set them
            PsiClass psiClass = PsiTreeUtil.getParentOfType(psiStatement, PsiClass.class);
            Set<String> fieldSet = new HashSet<String>();
            for(PsiField field: psiClass.getFields()) {
                fieldSet.add(field.getName());
            }

            // collect this.foo = "" and (this.)foo = ""
            // collection already init variables
            final Set<String> thisSet = new HashSet<String>();
            PsiTreeUtil.processElements(psiStatement.getParent(), new PsiElementProcessor() {

                @Override
                public boolean execute(@NotNull PsiElement element) {

                    if(element instanceof PsiThisExpression) {
                        attachFieldName(element.getParent());
                    } else if(element instanceof PsiAssignmentExpression) {
                       attachFieldName(((PsiAssignmentExpression) element).getLExpression());
                    }

                    return true;
                }

                private void attachFieldName(PsiElement psiExpression) {

                    if(!(psiExpression instanceof PsiReferenceExpression)) {
                        return;
                    }

                    PsiElement psiField = ((PsiReferenceExpression) psiExpression).resolve();
                    if(psiField instanceof PsiField) {
                        thisSet.add(((PsiField) psiField).getName());
                    }
                }
            });


            PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(psiStatement.getProject());
            for (AndroidView v: androidViews) {

                if(!fieldSet.contains(v.getFieldName())) {
                    String sb = "private " + v.getName() + " " + v.getFieldName() + ";";
                    psiClass.add(elementFactory.createFieldFromText(sb, psiClass));
                }

                if(!thisSet.contains(v.getFieldName())) {

                    String sb1;
                    if(variableName != null) {
                        sb1 = String.format("this.%s = (%s) %s.findViewById(%s);", v.getFieldName(), v.getName(), variableName, v.getId());
                    } else {
                        sb1 = String.format("this.%s = (%s) findViewById(%s);", v.getFieldName(), v.getName(), v.getId());
                    }


                    PsiStatement statementFromText = elementFactory.createStatementFromText(sb1, null);

                    psiStatement.getParent().addAfter(statementFromText, psiStatement);
                }

            }

            JavaCodeStyleManager.getInstance(psiStatement.getProject()).shortenClassReferences(psiStatement.getParent());
            new ReformatAndOptimizeImportsProcessor(psiStatement.getProject(), psiStatement.getContainingFile(), true).run();

        }
    });

}
 

@Override
public boolean processChildren(final PsiElementProcessor<PsiFileSystemItem> processor) {
  return true;
}
 

@Nonnull
public static PsiElement[] collectElements(@Nullable PsiElement element, @Nonnull PsiElementFilter filter) {
  PsiElementProcessor.CollectFilteredElements<PsiElement> processor = new PsiElementProcessor.CollectFilteredElements<PsiElement>(filter);
  processElements(element, processor);
  return processor.toArray();
}
 

@Override
public boolean processChildren(PsiElementProcessor<PsiFileSystemItem> processor) {
  throw createException();
}
 

@Override
public boolean processChildren(@Nonnull final PsiElementProcessor<PsiFileSystemItem> processor) {
  return true;
}
 

@Override
public boolean processChildren(@Nonnull final PsiElementProcessor<PsiFileSystemItem> processor) {
  return true;
}
 

@Nonnull
public static <T extends PsiElement> JBPopup getPsiElementPopup(@Nonnull T[] elements,
                                                                @Nonnull final PsiElementListCellRenderer<T> renderer,
                                                                @Nullable final String title,
                                                                @Nonnull final PsiElementProcessor<T> processor,
                                                                @Nullable final T selection) {
  final JList list = new JBList(elements);
  HintUpdateSupply.installSimpleHintUpdateSupply(list);
  list.setCellRenderer(renderer);

  list.setFont(EditorUtil.getEditorFont());

  if (selection != null) {
    list.setSelectedValue(selection, true);
  }

  final Runnable runnable = () -> {
    int[] ids = list.getSelectedIndices();
    if (ids == null || ids.length == 0) return;
    for (Object element : list.getSelectedValues()) {
      if (element != null) {
        processor.execute((T)element);
      }
    }
  };

  PopupChooserBuilder builder = new PopupChooserBuilder(list);
  if (title != null) {
    builder.setTitle(title);
  }
  renderer.installSpeedSearch(builder, true);

  JBPopup popup = builder.setItemChoosenCallback(runnable).createPopup();

  builder.getScrollPane().setBorder(null);
  builder.getScrollPane().setViewportBorder(null);

  hidePopupIfDumbModeStarts(popup, elements[0].getProject());

  return popup;
}
 

public FilterElementProcessor(ElementFilter filter,  PsiElementProcessor processor, List container){
  myFilter = filter;
  myProcessor = processor;
  myResults = container;
}
 

public FilterElementProcessor(ElementFilter filter, PsiElementProcessor proc){
  this(filter, proc, new ArrayList());
}