Java tutorial
/******************************************************************************* * Copyright 2017 Capital One Services, LLC and Bitwise, Inc. * 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 hydrograph.ui.menus.handlers; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.lang.reflect.InvocationTargetException; import java.security.NoSuchAlgorithmException; import java.util.ArrayList; import java.util.List; import org.apache.commons.collections.ListUtils; import org.eclipse.core.commands.AbstractHandler; import org.eclipse.core.commands.ExecutionEvent; import org.eclipse.core.commands.ExecutionException; import org.eclipse.core.commands.IHandler; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IFolder; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IResource; import org.eclipse.core.resources.IWorkspaceRoot; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IPath; import org.eclipse.jdt.internal.ui.refactoring.reorg.PasteAction; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.MessageBox; import org.eclipse.ui.IEditorPart; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.handlers.HandlerUtil; import org.eclipse.ui.navigator.CommonNavigator; import org.slf4j.Logger; import hydrograph.ui.engine.util.ConverterUtil; import hydrograph.ui.graph.editor.ELTGraphicalEditor; import hydrograph.ui.graph.editor.JobCopyParticipant; import hydrograph.ui.graph.model.Container; import hydrograph.ui.graph.model.utils.GenerateUniqueJobIdUtil; import hydrograph.ui.graph.utility.CanvasUtils; import hydrograph.ui.logging.factory.LogFactory; /** * The Class PasteHandler. * <p> * Handler to Paste component on canvas and Project Explorer * * @author Bitwise */ public class PasteHandler extends AbstractHandler implements IHandler { private static final Logger logger = LogFactory.INSTANCE.getLogger(PasteHandler.class); private static final String ERROR = "Error"; private static final String JOB_EXTENSION = ".job"; private static final String PROPERTIES_EXTENSION = ".properties"; private static final String XML = "xml"; private static final String JOB = "job"; private static final String PARAMETER_FOLDER_NAME = "param"; @Override public Object execute(ExecutionEvent event) throws ExecutionException { List<IFile> jobFiles = new ArrayList<>(); List<IFile> pastedFileList = new ArrayList<>(); IWorkbenchPart part = HandlerUtil.getActivePart(event); if (part instanceof CommonNavigator) { PasteAction action = new PasteAction( PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActivePart().getSite()); action.run(); IWorkspaceRoot workSpaceRoot = ResourcesPlugin.getWorkspace().getRoot(); IProject project = workSpaceRoot.getProject(JobCopyParticipant.getCopyToPath().split("/")[1]); IFolder jobFolder = project.getFolder(JobCopyParticipant.getCopyToPath() .substring(JobCopyParticipant.getCopyToPath().indexOf('/', 2))); IFolder paramFolder = project.getFolder(PARAMETER_FOLDER_NAME); try { createCurrentJobFileList(jobFolder, jobFiles); pastedFileList = getPastedFileList(jobFiles); generateUniqueJobIdForPastedFiles(pastedFileList); createXmlFilesForPastedJobFiles(pastedFileList); List<String> copiedPropertiesList = getCopiedPropertiesList(); createPropertiesFilesForPastedFiles(paramFolder, pastedFileList, copiedPropertiesList); JobCopyParticipant.cleanUpStaticResourcesAfterPasteOperation(); } catch (CoreException coreException) { logger.warn("Error while copy paste jobFiles", coreException.getMessage()); } } else if (part instanceof ELTGraphicalEditor) { IEditorPart editor = HandlerUtil.getActiveEditor(event); ((ELTGraphicalEditor) editor).pasteSelection(); } return null; } private void generateUniqueJobIdForPastedFiles(List<IFile> pastedFileList) { for (IFile file : pastedFileList) { try (ByteArrayOutputStream outStream = new ByteArrayOutputStream(); InputStream inputStream = file.getContents()) { Container container = (Container) CanvasUtils.INSTANCE.fromXMLToObject(inputStream); container.setUniqueJobId(GenerateUniqueJobIdUtil.INSTANCE.generateUniqueJobId()); CanvasUtils.INSTANCE.fromObjectToXML(container, outStream); file.setContents(new ByteArrayInputStream(outStream.toByteArray()), true, false, null); } catch (CoreException | NoSuchAlgorithmException | IOException exception) { logger.warn("Exception while generating unique job id for pasted files."); } } } private void createPropertiesFilesForPastedFiles(IFolder paramFolder, List<IFile> pastedFileList, List<String> copiedPropertiesList) { for (int i = 0; i < copiedPropertiesList.size(); i++) { try (InputStream inputStream = paramFolder.getFile(copiedPropertiesList.get(i)).getContents()) { IFile file = paramFolder .getFile(pastedFileList.get(i).getName().replace(JOB_EXTENSION, PROPERTIES_EXTENSION)); if (!file.exists()) { file.create(inputStream, true, null); } else { int userInput = showErrorMessage(file, file.getName() + " already exists.Do you want to replace it?"); if (userInput == SWT.YES) { file.setContents(inputStream, true, false, null); } } } catch (CoreException | IOException coreException) { logger.error("Error while creating properties files for pasted files ::{}", coreException.getMessage()); } } } private List<String> getCopiedPropertiesList() { List<String> copiedPropertiesList = new ArrayList<>(); List<IFile> copiedFileList = JobCopyParticipant.getCopiedFileList(); for (IFile iFile : copiedFileList) { copiedPropertiesList.add((iFile.getName().replace(JOB_EXTENSION, PROPERTIES_EXTENSION))); } return copiedPropertiesList; } private void createXmlFilesForPastedJobFiles(List<IFile> pastedFileList) { for (IFile file : pastedFileList) { try (InputStream inputStream = file.getContents()) { Container container = (Container) CanvasUtils.INSTANCE.fromXMLToObject(inputStream); IPath path = file.getFullPath().removeFileExtension().addFileExtension(XML); IFile xmlFile = ResourcesPlugin.getWorkspace().getRoot().getFile(path); if (xmlFile.exists()) { int userInput = showErrorMessage(xmlFile, xmlFile.getName() + " already exists.Do you want to replace it?"); if (userInput == SWT.YES) { ConverterUtil.INSTANCE.convertToXML(container, true, xmlFile, null); } } else { ConverterUtil.INSTANCE.convertToXML(container, true, xmlFile, null); } } catch (CoreException | InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException | IOException exception) { logger.error("Error while generating xml files for pasted job files", exception); } } } private int showErrorMessage(IFile xmlFile, String message) { MessageBox messageBox = new MessageBox(Display.getCurrent().getActiveShell(), SWT.ERROR | SWT.YES | SWT.NO); messageBox.setText(ERROR); messageBox.setMessage(message); int returnCode = messageBox.open(); return returnCode; } private void createCurrentJobFileList(IFolder jobFolder, List<IFile> jobFiles) throws CoreException { for (IResource iResource : jobFolder.members()) { if (!(iResource instanceof IFolder)) { IFile iFile = (IFile) iResource; if (iFile.getFileExtension().equalsIgnoreCase(JOB)) { jobFiles.add(iFile); } } } } private List<IFile> getPastedFileList(List<IFile> jobFiles) { List<IFile> newJobFilesList = ListUtils.subtract(jobFiles, JobCopyParticipant.getPreviousJobFiles()); jobFiles.clear(); jobFiles.addAll(newJobFilesList); return jobFiles; } }