/**
* Evaluates the page
*
* <p>This checks whether the current settings on the page make any sense. If everything is fine,
* the settings are being put into the appropriate data container {@link ImportWizardModel} and
* the current page is marked as complete by invoking {@link #setPageComplete(boolean)}. Otherwise
* an error message is set, which will make sure the user is informed about the reason for the
* error.
*/
private void evaluatePage() {
setPageComplete(false);
setErrorMessage(null);
tablePreview.setVisible(false);
if (comboLocation.getText().equals("")) { // $NON-NLS-1$
return;
}
try {
if (!customLinebreak) {
detectLinebreak();
comboLinebreak.select(selectedLinebreak);
}
if (!customDelimiter) {
detectDelimiter();
comboDelimiter.select(selectedDelimiter);
}
readPreview();
} catch (IOException | IllegalArgumentException e) {
setErrorMessage(e.getMessage());
return;
} catch (TextParsingException e) {
setErrorMessage(Resources.getMessage("ImportWizardPageCSV.16")); // $NON-NLS-1$
return;
} catch (RuntimeException e) {
if (e.getCause() != null) {
setErrorMessage(e.getCause().getMessage());
} else {
setErrorMessage(e.getMessage());
}
return;
}
/* Put data into container */
ImportWizardModel data = wizardImport.getData();
data.setWizardColumns(wizardColumns);
data.setPreviewData(previewData);
data.setFirstRowContainsHeader(btnContainsHeader.getSelection());
data.setFileLocation(comboLocation.getText());
data.setCsvDelimiter(delimiters[selectedDelimiter]);
data.setCsvQuote(quotes[selectedQuote]);
data.setCsvEscape(escapes[selectedEscape]);
data.setCharset(
Charsets.getCharsetForName(Charsets.getNamesOfAvailableCharsets()[selectedCharset]));
data.setCsvLinebreak(
CSVSyntax.getLinebreakForLabel(CSVSyntax.getAvailableLinebreaks()[selectedLinebreak]));
/* Mark page as completed */
setPageComplete(true);
}
/**
* Reads in preview data
*
* <p>This goes through up to {@link ImportWizardModel#PREVIEW_MAX_LINES} lines within the
* appropriate file and reads them in. It uses {@link ImportAdapter} in combination with {@link
* ImportConfigurationCSV} to actually read in the data.
*
* @throws IOException Signals that an I/O exception has occurred.
*/
private void readPreview() throws IOException {
/* Reset preview data */
previewData.clear();
/* Parameters from the user interface */
final String location = comboLocation.getText();
final char delimiter = delimiters[selectedDelimiter];
final char[] linebreak =
CSVSyntax.getLinebreakForLabel(CSVSyntax.getAvailableLinebreaks()[selectedLinebreak]);
final char quote = quotes[selectedQuote];
final char escape = escapes[selectedEscape];
final boolean containsHeader = btnContainsHeader.getSelection();
final Charset charset =
Charsets.getCharsetForName(Charsets.getNamesOfAvailableCharsets()[selectedCharset]);
/* Variables needed for processing */
final CSVDataInput in =
new CSVDataInput(location, charset, delimiter, quote, escape, linebreak);
final Iterator<String[]> it = in.iterator();
final String[] firstLine;
wizardColumns = new ArrayList<ImportWizardModelColumn>();
ImportConfigurationCSV config =
new ImportConfigurationCSV(
location, charset, delimiter, quote, escape, linebreak, containsHeader);
/* Check whether there is at least one line in file and retrieve it */
if (it.hasNext()) {
firstLine = it.next();
} else {
in.close();
throw new IOException(Resources.getMessage("ImportWizardPageCSV.17")); // $NON-NLS-1$
}
/* Iterate over columns and add it to {@link #allColumns} */
for (int i = 0; i < firstLine.length; i++) {
ImportColumn column = new ImportColumnCSV(i, DataType.STRING);
ImportWizardModelColumn wizardColumn = new ImportWizardModelColumn(column);
wizardColumns.add(wizardColumn);
config.addColumn(column);
}
/* Create adapter to import data with given configuration */
ImportAdapter importAdapter = ImportAdapter.create(config);
/* Get up to {ImportData#previewDataMaxLines} lines for previewing */
int count = 0;
while (importAdapter.hasNext() && (count <= ImportWizardModel.PREVIEW_MAX_LINES)) {
previewData.add(importAdapter.next());
count++;
}
in.close();
/* Remove first entry as it always contains name of columns */
previewData.remove(0);
/* Check whether there is actual any data */
if (previewData.size() == 0) {
throw new IOException(Resources.getMessage("ImportWizardPageCSV.18")); // $NON-NLS-1$
}
/*
* Show preview in appropriate table
*/
/* Disable redrawing once redesign is finished */
tablePreview.setRedraw(false);
/* Remove all of the old columns */
while (tablePreview.getColumnCount() > 0) {
tablePreview.getColumns()[0].dispose();
}
/* Add new columns */
for (ImportWizardModelColumn column : wizardColumns) {
TableViewerColumn tableViewerColumn = new TableViewerColumn(tableViewerPreview, SWT.NONE);
tableViewerColumn.setLabelProvider(
new CSVColumnLabelProvider(((ImportColumnCSV) column.getColumn()).getIndex()));
TableColumn tableColumn = tableViewerColumn.getColumn();
tableColumn.setWidth(100);
if (btnContainsHeader.getSelection()) {
tableColumn.setText(column.getColumn().getAliasName());
tableColumn.setToolTipText(
Resources.getMessage("ImportWizardPageCSV.19")
+ ((ImportColumnCSV) column.getColumn()).getIndex()); // $NON-NLS-1$
}
ColumnViewerToolTipSupport.enableFor(tableViewerPreview, ToolTip.NO_RECREATE);
}
/* Setup preview table */
tableViewerPreview.setInput(previewData);
tablePreview.setHeaderVisible(btnContainsHeader.getSelection());
tablePreview.setVisible(true);
tablePreview.layout();
tablePreview.setRedraw(true);
}