Java tutorial
/* * Copyright 2000-2013 JetBrains s.r.o. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.intellij.ide.util; import com.intellij.CommonBundle; import com.intellij.history.LocalHistory; import com.intellij.history.LocalHistoryAction; import com.intellij.ide.DataManager; import com.intellij.ide.DeleteProvider; import com.intellij.ide.IdeBundle; import com.intellij.openapi.actionSystem.CommonDataKeys; import com.intellij.openapi.actionSystem.DataContext; import com.intellij.openapi.actionSystem.LangDataKeys; import com.intellij.openapi.application.ApplicationBundle; import com.intellij.openapi.application.ApplicationManager; import com.intellij.openapi.application.ApplicationNamesInfo; import com.intellij.openapi.command.CommandProcessor; import com.intellij.openapi.project.DumbService; import com.intellij.openapi.project.Project; import com.intellij.openapi.ui.DialogWrapper; import com.intellij.openapi.ui.Messages; import com.intellij.openapi.ui.ex.MessagesEx; import com.intellij.openapi.util.Ref; import com.intellij.openapi.vfs.VFileProperty; import com.intellij.openapi.vfs.VirtualFile; import com.intellij.openapi.vfs.WritingAccessProvider; import com.intellij.psi.PsiDirectory; import com.intellij.psi.PsiElement; import com.intellij.psi.PsiFile; import com.intellij.psi.PsiFileSystemItem; import com.intellij.psi.util.PsiTreeUtil; import com.intellij.psi.util.PsiUtilBase; import com.intellij.psi.util.PsiUtilCore; import com.intellij.refactoring.RefactoringBundle; import com.intellij.refactoring.safeDelete.SafeDeleteDialog; import com.intellij.refactoring.safeDelete.SafeDeleteProcessor; import com.intellij.refactoring.util.CommonRefactoringUtil; import com.intellij.refactoring.util.RefactoringUIUtil; import com.intellij.util.IncorrectOperationException; import com.intellij.util.io.ReadOnlyAttributeUtil; import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; public class DeleteHandler { private DeleteHandler() { } public static class DefaultDeleteProvider implements DeleteProvider { @Override public boolean canDeleteElement(@NotNull DataContext dataContext) { if (CommonDataKeys.PROJECT.getData(dataContext) == null) { return false; } final PsiElement[] elements = getPsiElements(dataContext); return elements != null && shouldEnableDeleteAction(elements); } @Nullable private static PsiElement[] getPsiElements(DataContext dataContext) { PsiElement[] elements = LangDataKeys.PSI_ELEMENT_ARRAY.getData(dataContext); if (elements == null) { final PsiElement data = CommonDataKeys.PSI_ELEMENT.getData(dataContext); if (data != null) { elements = new PsiElement[] { data }; } else { final PsiFile data1 = CommonDataKeys.PSI_FILE.getData(dataContext); if (data1 != null) { elements = new PsiElement[] { data1 }; } } } return elements; } @Override public void deleteElement(@NotNull DataContext dataContext) { PsiElement[] elements = getPsiElements(dataContext); if (elements == null) return; Project project = CommonDataKeys.PROJECT.getData(dataContext); if (project == null) return; LocalHistoryAction a = LocalHistory.getInstance().startAction(IdeBundle.message("progress.deleting")); try { deletePsiElement(elements, project); } finally { a.finish(); } } } public static void deletePsiElement(final PsiElement[] elementsToDelete, final Project project) { deletePsiElement(elementsToDelete, project, true); } public static void deletePsiElement(final PsiElement[] elementsToDelete, final Project project, boolean needConfirmation) { if (elementsToDelete == null || elementsToDelete.length == 0) return; final PsiElement[] elements = PsiTreeUtil.filterAncestors(elementsToDelete); boolean safeDeleteApplicable = true; for (int i = 0; i < elements.length && safeDeleteApplicable; i++) { PsiElement element = elements[i]; safeDeleteApplicable = SafeDeleteProcessor.validElement(element); } final boolean dumb = DumbService.getInstance(project).isDumb(); if (safeDeleteApplicable && !dumb) { final Ref<Boolean> exit = Ref.create(false); final SafeDeleteDialog dialog = new SafeDeleteDialog(project, elements, new SafeDeleteDialog.Callback() { @Override public void run(final SafeDeleteDialog dialog) { if (!CommonRefactoringUtil.checkReadOnlyStatusRecursively(project, Arrays.asList(elements), true)) return; SafeDeleteProcessor.createInstance(project, new Runnable() { @Override public void run() { exit.set(true); dialog.close(DialogWrapper.OK_EXIT_CODE); } }, elements, dialog.isSearchInComments(), dialog.isSearchForTextOccurences(), true) .run(); } }) { @Override protected boolean isDelete() { return true; } }; if (needConfirmation) { dialog.show(); if (!dialog.isOK() || exit.get()) return; } } else { @SuppressWarnings({ "UnresolvedPropertyKey" }) String warningMessage = DeleteUtil.generateWarningMessage(IdeBundle.message("prompt.delete.elements"), elements); boolean anyDirectories = false; String directoryName = null; for (PsiElement psiElement : elementsToDelete) { if (psiElement instanceof PsiDirectory && !PsiUtilBase.isSymLink((PsiDirectory) psiElement)) { anyDirectories = true; directoryName = ((PsiDirectory) psiElement).getName(); break; } } if (anyDirectories) { if (elements.length == 1) { warningMessage += IdeBundle.message("warning.delete.all.files.and.subdirectories", directoryName); } else { warningMessage += IdeBundle .message("warning.delete.all.files.and.subdirectories.in.the.selected.directory"); } } if (safeDeleteApplicable && dumb) { warningMessage += "\n\nWarning:\n Safe delete is not available while " + ApplicationNamesInfo.getInstance().getFullProductName() + " updates indices,\n no usages will be checked."; } if (needConfirmation) { int result = Messages.showOkCancelDialog(project, warningMessage, IdeBundle.message("title.delete"), ApplicationBundle.message("button.delete"), CommonBundle.getCancelButtonText(), Messages.getQuestionIcon()); if (result != Messages.OK) return; } } CommandProcessor.getInstance().executeCommand(project, new Runnable() { @Override public void run() { if (!CommonRefactoringUtil.checkReadOnlyStatusRecursively(project, Arrays.asList(elements), false)) { return; } // deleted from project view or something like that. if (CommonDataKeys.EDITOR.getData(DataManager.getInstance().getDataContext()) == null) { CommandProcessor.getInstance().markCurrentCommandAsGlobal(project); } for (final PsiElement elementToDelete : elements) { if (!elementToDelete.isValid()) continue; //was already deleted if (elementToDelete instanceof PsiDirectory) { VirtualFile virtualFile = ((PsiDirectory) elementToDelete).getVirtualFile(); if (virtualFile.isInLocalFileSystem() && !virtualFile.is(VFileProperty.SYMLINK)) { ArrayList<VirtualFile> readOnlyFiles = new ArrayList<VirtualFile>(); CommonRefactoringUtil.collectReadOnlyFiles(virtualFile, readOnlyFiles); if (!readOnlyFiles.isEmpty()) { String message = IdeBundle.message("prompt.directory.contains.read.only.files", virtualFile.getPresentableUrl()); int _result = Messages.showYesNoDialog(project, message, IdeBundle.message("title.delete"), Messages.getQuestionIcon()); if (_result != Messages.YES) continue; boolean success = true; for (VirtualFile file : readOnlyFiles) { success = clearReadOnlyFlag(file, project); if (!success) break; } if (!success) continue; } } } else if (!elementToDelete.isWritable() && !(elementToDelete instanceof PsiFileSystemItem && PsiUtilBase.isSymLink((PsiFileSystemItem) elementToDelete))) { final PsiFile file = elementToDelete.getContainingFile(); if (file != null) { final VirtualFile virtualFile = file.getVirtualFile(); if (virtualFile.isInLocalFileSystem()) { int _result = MessagesEx.fileIsReadOnly(project, virtualFile) .setTitle(IdeBundle.message("title.delete")) .appendMessage(IdeBundle.message("prompt.delete.it.anyway")).askYesNo(); if (_result != Messages.YES) continue; boolean success = clearReadOnlyFlag(virtualFile, project); if (!success) continue; } } } try { elementToDelete.checkDelete(); } catch (IncorrectOperationException ex) { Messages.showMessageDialog(project, ex.getMessage(), CommonBundle.getErrorTitle(), Messages.getErrorIcon()); continue; } ApplicationManager.getApplication().runWriteAction(new Runnable() { @Override public void run() { try { elementToDelete.delete(); } catch (final IncorrectOperationException ex) { ApplicationManager.getApplication().invokeLater(new Runnable() { @Override public void run() { Messages.showMessageDialog(project, ex.getMessage(), CommonBundle.getErrorTitle(), Messages.getErrorIcon()); } }); } } }); } } }, RefactoringBundle.message("safe.delete.command", RefactoringUIUtil.calculatePsiElementDescriptionList(elements)), null); } private static boolean clearReadOnlyFlag(final VirtualFile virtualFile, final Project project) { final boolean[] success = new boolean[1]; CommandProcessor.getInstance().executeCommand(project, new Runnable() { @Override public void run() { Runnable action = new Runnable() { @Override public void run() { try { ReadOnlyAttributeUtil.setReadOnlyAttribute(virtualFile, false); success[0] = true; } catch (IOException e1) { Messages.showMessageDialog(project, e1.getMessage(), CommonBundle.getErrorTitle(), Messages.getErrorIcon()); } } }; ApplicationManager.getApplication().runWriteAction(action); } }, "", null); return success[0]; } public static boolean shouldEnableDeleteAction(PsiElement[] elements) { if (elements == null || elements.length == 0) return false; for (PsiElement element : elements) { VirtualFile virtualFile = PsiUtilCore.getVirtualFile(element); if (virtualFile == null) { return false; } if (!WritingAccessProvider.isPotentiallyWritable(virtualFile, element.getProject())) { return false; } } return true; } }