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org.datacleaner.windows.AbstractFileBasedDatastoreDialog Maven / Gradle / Ivy
/**
* DataCleaner (community edition)
* Copyright (C) 2014 Free Software Foundation, Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.windows;
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Arrays;
import java.util.List;
import java.util.Map.Entry;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.SwingWorker;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import org.apache.metamodel.DataContext;
import org.apache.metamodel.data.DataSet;
import org.apache.metamodel.data.DataSetTableModel;
import org.apache.metamodel.query.Query;
import org.apache.metamodel.schema.Column;
import org.apache.metamodel.schema.Table;
import org.apache.metamodel.util.FileHelper;
import org.apache.metamodel.util.FileResource;
import org.apache.metamodel.util.Resource;
import org.datacleaner.bootstrap.WindowContext;
import org.datacleaner.connection.Datastore;
import org.datacleaner.connection.DatastoreConnection;
import org.datacleaner.connection.FileDatastore;
import org.datacleaner.connection.ResourceDatastore;
import org.datacleaner.panels.DCPanel;
import org.datacleaner.user.MutableDatastoreCatalog;
import org.datacleaner.user.UserPreferences;
import org.datacleaner.util.ImmutableEntry;
import org.datacleaner.util.StringUtils;
import org.datacleaner.util.WidgetFactory;
import org.datacleaner.util.WidgetUtils;
import org.datacleaner.widgets.AbstractResourceTextField;
import org.datacleaner.widgets.DCLabel;
import org.datacleaner.widgets.DescriptionLabel;
import org.datacleaner.widgets.FilenameTextField;
import org.datacleaner.widgets.LoadingIcon;
import org.datacleaner.widgets.table.DCTable;
import org.jdesktop.swingx.JXStatusBar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Superclass for rather simple file-based datastores such as Excel-datastores,
* Access-datastores, dBase-datastores etc.
*
* @param
* the type of datastore
*/
public abstract class AbstractFileBasedDatastoreDialog extends AbstractDatastoreDialog {
/**
* Amount of bytes to read for autodetection of encoding, separator and quotes
*/
protected static final int SAMPLE_BUFFER_SIZE = 128 * 1024;
private static final long serialVersionUID = 1L;
/**
* Max amount of columns to display in the preview table
*/
private static final int PREVIEW_COLUMNS = 10;
protected final Logger logger = LoggerFactory.getLogger(getClass());
private final FilenameTextField _filenameField;
private final DCPanel _previewTablePanel;
private final DCTable _previewTable;
private final LoadingIcon _loadingIcon;
protected AbstractFileBasedDatastoreDialog(final D originalDatastore,
final MutableDatastoreCatalog mutableDatastoreCatalog, final WindowContext windowContext,
final UserPreferences userPreferences) {
super(originalDatastore, mutableDatastoreCatalog, windowContext, userPreferences);
_statusLabel.setText("Please select file");
_filenameField = new FilenameTextField(getUserPreferences().getOpenDatastoreDirectory(), true);
if (originalDatastore != null) {
if (originalDatastore instanceof ResourceDatastore) {
final ResourceDatastore resourceDatastore = (ResourceDatastore) originalDatastore;
final Resource resource = resourceDatastore.getResource();
if (resource instanceof FileResource) {
final File file = ((FileResource) resource).getFile();
_filenameField.setFile(file);
}
} else if (originalDatastore instanceof FileDatastore) {
final FileDatastore fileDatastore = (FileDatastore) originalDatastore;
final String filename = fileDatastore.getFilename();
_filenameField.setFilename(filename);
}
}
// add listeners after setting initial values.
setFileFilters(_filenameField);
_filenameField.addFileSelectionListener((filenameTextField, file) -> {
final File dir;
if (file.isDirectory()) {
dir = file;
} else {
dir = file.getParentFile();
}
getUserPreferences().setOpenDatastoreDirectory(dir);
if (StringUtils.isNullOrEmpty(_datastoreNameTextField.getText())) {
_datastoreNameTextField.setText(file.getName());
}
validateAndUpdate();
onFileSelected(file);
});
if (isDirectoryBased()) {
_filenameField.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
}
if (isPreviewTableEnabled()) {
_previewTable = new DCTable(new DefaultTableModel(7, 10));
_previewTablePanel = _previewTable.toPanel(false);
_loadingIcon = new LoadingIcon();
_loadingIcon.setVisible(false);
_loadingIcon.setPreferredSize(_previewTablePanel.getPreferredSize());
} else {
_previewTable = null;
_previewTablePanel = null;
_loadingIcon = null;
}
}
/**
* Can be overridden by subclasses in order to react to file selection events.
*
* @param file selected file
*/
protected void onFileSelected(final File file) {
}
protected abstract D createDatastore(String name, String filename);
protected abstract void setFileFilters(AbstractResourceTextField filenameField);
@Override
protected final void validateAndUpdate() {
final boolean valid = validateForm();
setSaveButtonEnabled(valid);
if (valid) {
updatePreviewTable();
}
}
protected boolean validateForm() {
final String filename = _filenameField.getFilename();
if (StringUtils.isNullOrEmpty(filename)) {
setStatusError("Please enter or select a filename");
return false;
}
final File file = new File(filename);
if (!file.exists()) {
setStatusError("The file does not exist!");
return false;
}
if (isDirectoryBased()) {
if (!file.isDirectory()) {
setStatusError("Not a valid directory!");
return false;
}
} else {
if (!file.isFile()) {
setStatusError("Not a valid file!");
return false;
}
}
final String datastoreName = _datastoreNameTextField.getText();
if (StringUtils.isNullOrEmpty(datastoreName)) {
setStatusError("Please enter a datastore name");
return false;
}
setStatusValid();
return true;
}
protected boolean isPreviewTableEnabled() {
return false;
}
@Override
protected int getDialogWidth() {
if (isPreviewTableEnabled()) {
return 650;
}
return super.getDialogWidth();
}
@Override
protected final D createDatastore() {
return createDatastore(getDatastoreName(), getFilename());
}
protected List> getFormElements() {
final List> res = super.getFormElements();
if (isDirectoryBased()) {
res.add(new ImmutableEntry<>("Directory", _filenameField));
} else {
res.add(new ImmutableEntry<>("Filename", _filenameField));
}
return res;
}
public String getDatastoreName() {
return _datastoreNameTextField.getText();
}
public String getFilename() {
return _filenameField.getFilename();
}
private void updatePreviewTable() {
if (!isPreviewTableEnabled()) {
return;
}
// show loading indicator
setSaveButtonEnabled(false);
_previewTable.setVisible(false);
_loadingIcon.setVisible(true);
// read file in background, it may take time if eg. it's located on a
// network drive
new SwingWorker() {
@Override
protected DataSet doInBackground() throws Exception {
return getPreviewData(getFilename());
}
@Override
protected void done() {
try {
final DataSet dataSet = get();
if (dataSet != null) {
final TableModel tableModel = new DataSetTableModel(dataSet);
_previewTable.setModel(tableModel);
}
} catch (Throwable e) {
if (e instanceof ExecutionException) {
// get the cause of the execution exception (it's a
// wrapper around the throwable)
e = e.getCause();
}
if (logger.isWarnEnabled()) {
logger.warn("Error creating preview data: " + e.getMessage(), e);
}
setStatusError("Error create preview data: " + e.getMessage());
}
// show table
_previewTable.setVisible(true);
_loadingIcon.setVisible(false);
setSaveButtonEnabled(true);
}
}.execute();
}
private DataSet getPreviewData(final String filename) {
if (!isPreviewDataAvailable()) {
logger.info("Not displaying preview table because isPreviewDataAvailable() returned false");
return null;
}
final D datastore = getPreviewDatastore(filename);
try (DatastoreConnection con = datastore.openConnection()) {
final DataContext dc = con.getDataContext();
final Table table = getPreviewTable(dc);
List columns = table.getColumns();
if (columns.size() > getPreviewColumns()) {
// include max 10 columns
columns = columns.stream().limit(getPreviewColumns()).collect(Collectors.toList());
}
final Query q = dc.query().from(table).select(columns).toQuery();
q.setMaxRows(7);
return dc.executeQuery(q);
}
}
@Override
protected final JComponent getDialogContent() {
final DCPanel formPanel = new DCPanel();
final List> formElements = getFormElements();
// temporary variable to make it easier to refactor the layout
int row = 0;
for (final Entry entry : formElements) {
final String key = entry.getKey();
if (StringUtils.isNullOrEmpty(key)) {
WidgetUtils.addToGridBag(entry.getValue(), formPanel, 0, row, 2, 1);
} else {
WidgetUtils.addToGridBag(DCLabel.bright(key + ":"), formPanel, 0, row);
WidgetUtils.addToGridBag(entry.getValue(), formPanel, 1, row);
}
row++;
}
if (isPreviewTableEnabled()) {
WidgetUtils.addToGridBag(_loadingIcon, formPanel, 0, row, 2, 1);
row++;
}
final DCPanel centerPanel = new DCPanel();
centerPanel.setLayout(new GridBagLayout());
WidgetUtils.addToGridBag(formPanel, centerPanel, 0, 0, 1, 1, GridBagConstraints.NORTH, 4, 0, 0);
if (isPreviewTableEnabled()) {
WidgetUtils.addToGridBag(_previewTablePanel, centerPanel, 0, 1, 1, 1, GridBagConstraints.NORTH, 4, 0.1, 1.0,
GridBagConstraints.BOTH);
}
WidgetUtils.addToGridBag(getButtonPanel(), centerPanel, 0, 2, 1, 1, GridBagConstraints.SOUTH, 4, 0, 0.1);
centerPanel.setBorder(WidgetUtils.BORDER_TOP_PADDING);
final JXStatusBar statusBar = WidgetFactory.createStatusBar(_statusLabel);
_outerPanel.setLayout(new BorderLayout());
_outerPanel.add(centerPanel, BorderLayout.CENTER);
_outerPanel.add(statusBar, BorderLayout.SOUTH);
final String descriptionText = getDescriptionText();
if (descriptionText != null) {
final DescriptionLabel descriptionLabel = new DescriptionLabel();
descriptionLabel.setText(descriptionText);
_outerPanel.add(descriptionLabel, BorderLayout.NORTH);
}
validateAndUpdate();
return _outerPanel;
}
protected boolean isPreviewDataAvailable() {
return true;
}
protected Table getPreviewTable(final DataContext dc) {
return dc.getDefaultSchema().getTable(0);
}
protected int getPreviewColumns() {
return PREVIEW_COLUMNS;
}
protected D getPreviewDatastore(final String filename) {
return createDatastore("Preview", filename);
}
protected byte[] getSampleBuffer() {
final File file = new File(getFilename());
byte[] bytes = new byte[SAMPLE_BUFFER_SIZE];
FileInputStream fileInputStream = null;
try {
fileInputStream = new FileInputStream(file);
final int bufferSize = fileInputStream.read(bytes, 0, SAMPLE_BUFFER_SIZE);
if (bufferSize != -1 && bufferSize != SAMPLE_BUFFER_SIZE) {
bytes = Arrays.copyOf(bytes, bufferSize);
}
return bytes;
} catch (final IOException e) {
logger.error("IOException occurred while reading sample buffer", e);
return new byte[0];
} finally {
FileHelper.safeClose(fileInputStream);
}
}
protected char[] readSampleBuffer(final byte[] bytes, final String charSet) {
char[] buffer = new char[bytes.length];
Reader reader = null;
try {
reader = new InputStreamReader(new ByteArrayInputStream(bytes), charSet);
// read a sample of the file to auto-detect quotes and separators
final int bufferSize = reader.read(buffer);
if (bufferSize != -1) {
buffer = Arrays.copyOf(buffer, bufferSize);
}
} catch (final Exception e) {
if (logger.isWarnEnabled()) {
logger.warn("Error reading from file: " + e.getMessage(), e);
}
setStatusError("Error reading from file: " + e.getMessage());
return new char[0];
} finally {
if (reader != null) {
try {
reader.close();
} catch (final IOException ioe) {
logger.debug("Could not close reader", ioe);
}
}
}
return buffer;
}
protected DCTable getPreviewTable() {
return _previewTable;
}
protected boolean isDirectoryBased() {
return false;
}
}
