Java tutorial
package com.intuit.tank.project; /* * #%L * JSF Support Beans * %% * Copyright (C) 2011 - 2015 Intuit Inc. * %% * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * #L% */ import java.io.IOException; import java.io.Serializable; import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import javax.annotation.PostConstruct; import javax.enterprise.event.Event; import javax.enterprise.event.Observes; import javax.faces.bean.ViewScoped; import javax.faces.context.FacesContext; import javax.faces.model.SelectItem; import javax.inject.Inject; import javax.inject.Named; import org.apache.commons.io.IOUtils; import org.apache.commons.lang.StringUtils; import org.apache.log4j.Logger; import org.jboss.seam.international.status.Messages; import com.intuit.tank.ModifiedDatafileMessage; import com.intuit.tank.PreferencesBean; import com.intuit.tank.auth.Security; import com.intuit.tank.dao.DataFileDao; import com.intuit.tank.datafile.util.DataFileServiceUtil; import com.intuit.tank.prefs.TablePreferences; import com.intuit.tank.qualifier.Modified; import com.intuit.tank.storage.FileData; import com.intuit.tank.storage.FileStorage; import com.intuit.tank.storage.FileStorageFactory; import com.intuit.tank.util.DataFileUtil; import com.intuit.tank.util.Multiselectable; import com.intuit.tank.view.filter.ViewFilterType; import com.intuit.tank.vm.settings.AccessRight; import com.intuit.tank.vm.settings.TankConfig; import com.intuit.tank.wrapper.SelectableBean; import com.intuit.tank.wrapper.SelectableWrapper; @Named @ViewScoped public class DataFileBrowser extends SelectableBean<DataFile> implements Serializable, Multiselectable<DataFile> { private static final long serialVersionUID = 1L; private static final Logger LOG = Logger.getLogger(DataFileBrowser.class); private SelectableWrapper<DataFile> selectedFile; @Inject @Modified private Event<ModifiedDatafileMessage> dataFileEvent; @Inject private Messages messages; @Inject private Security security; private DataFile viewDatafile; private int currentPage; private int inputPage = 1; private int numEntriesToShow = 50; private SelectItem[] creatorList; private List<String> currentEntries; private boolean current = true; @Inject private PreferencesBean userPrefs; @PostConstruct public void init() { tablePrefs = new TablePreferences(userPrefs.getPreferences().getDatafilesTableColumns()); tablePrefs.registerListener(userPrefs); } /** * * @{inheritDoc */ public void delete(DataFile dataFile) { if (!security.hasRight(AccessRight.DELETE_DATAFILE) && !security.isOwner(dataFile)) { messages.warn("You don't have permission to delete this data file."); } else { try { new DataFileDao().delete(dataFile); messages.info("Datafile " + dataFile.getPath() + " has been deleted."); dataFileEvent.fire(new ModifiedDatafileMessage(dataFile, this)); } catch (Exception e) { } } } /** * @return the creatorList */ public SelectItem[] getCreatorList() { return creatorList; } /** * @return the viewDatafile */ public DataFile getViewDatafile() { return viewDatafile; } /** * @param viewDatafile * the viewDatafile to set */ public void setViewDatafile(DataFile viewDatafile) { this.currentPage = 0; currentEntries = null; this.viewDatafile = viewDatafile; } public void selectDataFile() { Map<String, String> params = FacesContext.getCurrentInstance().getExternalContext() .getRequestParameterMap(); setViewDatafileId(Integer.parseInt(params.get("dataFileId"))); } /** * @param viewDatafile * the viewDatafile to set */ public void setViewDatafileId(int viewDatafileId) { setViewDatafile(new DataFileDao().findById(viewDatafileId)); } /** * @return the numEntriesToShow */ public int getNumEntriesToShow() { return numEntriesToShow; } /** * @param numEntriesToShow * the numEntriesToShow to set */ public void setNumEntriesToShow(int numEntriesToShow) { this.numEntriesToShow = numEntriesToShow; } public void nextSetOfEntries() { currentPage++; } public void prevSetOfEntries() { currentPage--; } public String getEntries() { List<String> currentEntries = getCurrentEntries(); int start = Math.max(0, Math.min(currentPage * numEntriesToShow, getTotalLines() - numEntriesToShow)); int end = Math.max(0, Math.min(start + numEntriesToShow, getTotalLines())); return StringUtils.join(currentEntries.subList(start, end), '\n'); } /** * * @return */ public int getStartIndex() { return Math.max(0, Math.min(currentPage * numEntriesToShow, getTotalLines() - numEntriesToShow)) + 1; } public boolean enablePrev() { return currentPage > 0; } public boolean enableNext() { return getEndIndex() < getTotalLines(); } /** * * @return */ public int getEndIndex() { return Math.max(0, Math.min(Math.max(0, Math.min(currentPage * numEntriesToShow, getTotalLines() - numEntriesToShow)) + numEntriesToShow, getTotalLines())); } public int getTotalLines() { return getCurrentEntries().size(); } /** * @return */ @SuppressWarnings("unchecked") private List<String> getCurrentEntries() { if (currentEntries == null) { currentEntries = new ArrayList<String>(); if (viewDatafile != null) { FileData fd = DataFileUtil.getFileData(viewDatafile); try { FileStorage fileStorage = FileStorageFactory .getFileStorage(new TankConfig().getDataFileStorageDir(), false); currentEntries = IOUtils.readLines(fileStorage.readFileData(fd)); } catch (IOException e) { LOG.error("Error reading file " + fd.toString() + ": " + e, e); currentEntries.add("Error reading dataFile: " + e.toString()); } } else { currentEntries.add("current Data File Not set."); } } return currentEntries; } /** * @return the selectedFile */ public SelectableWrapper<DataFile> getSelectedFile() { return selectedFile; } /** * @param selectedFile * the selectedFile to set */ public void setSelectedFile(SelectableWrapper<DataFile> selectedFile) { this.selectedFile = selectedFile; } public int getNumPages() { int numCurrentEntries = getCurrentEntries().size(); return numCurrentEntries / numEntriesToShow; } public void goToFirstPage() { currentPage = 0; } public void goToLastPage() { currentPage = getNumPages(); } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getInputPage() { return inputPage; } public void setInputPage(int inputPage) { this.inputPage = inputPage; } public void jumpToInputPage() { int pageNum = inputPage - 1; if (!(pageNum < 0 || pageNum > getNumPages())) { currentPage = pageNum; } } public String getDataFileDownloadLink(DataFile dataFile) { if (dataFile != null) { return DataFileServiceUtil.getDownloadUrl(dataFile.getId()); } else { return ""; } } /** * @{inheritDoc */ @Override public List<DataFile> getEntityList(ViewFilterType viewFilter) { List<DataFile> files = new DataFileDao().findFiltered(viewFilter); // Collections.sort(files); Set<String> set = new HashSet<String>(); for (DataFile f : files) { set.add(f.getCreator()); } List<String> list = new ArrayList<String>(set); Collections.sort(list); creatorList = new SelectItem[list.size() + 1]; creatorList[0] = new SelectItem("", "All"); for (int i = 0; i < list.size(); i++) { creatorList[i + 1] = new SelectItem(list.get(i)); } current = true; return files; } /** * @{inheritDoc */ @Override public boolean isCurrent() { return current; } public void observerUpload(@Observes ModifiedDatafileMessage msg) { current = false; } public boolean canCreateDatafile() { return security.hasRight(AccessRight.CREATE_DATAFILE); } }