visual basic 6.0 barcode generator If either of these fields has not been entered, an error message is added to the error list. in Java

Generator PDF417 in Java If either of these fields has not been entered, an error message is added to the error list.

If either of these fields has not been entered, an error message is added to the error list.
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The following code checks to see if any errors have been recorded during validation. If so, all the errors are concatenated into a single message and displayed with a call to showError( ).
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// Show errors, if any, and return. if (errorList.size() > 0) { StringBuffer message = new StringBuffer(); // Concatenate errors into single message. for (int i = 0; i < errorList.size(); i++) { message.append(errorList.get(i)); if (i + 1 < errorList.size()) { message.append("\n"); } } showError(message.toString()); return; }
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For efficiency s sake, a StringBuffer object (referred to by message) is used to hold the concatenated message. The error list is iterated over with a for loop, adding each message to message. Notice that each time a message is added, a check is performed to see if the message is the last in the list or not. If the message is not the last message in the list, a newline (\n) character is added so that each message will be displayed on its own line in the error dialog box shown with the showError( ) method. Finally, after all the field validations are successful, actionSearch( ) concludes by removing www from the starting URL and then calling the search( ) method:
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// Remove "www" from start URL if present. startUrl = removeWwwFromUrl(startUrl); // Start the Search Crawler. search(logFile, startUrl, maxUrls, searchString);
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The search( ) Method
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The search( ) method is used to begin the Web crawling process. Since this process can take a considerable amount of time to complete, a new thread is created so that the search code can run independently. This frees up Swing s event thread, allowing changes in the interface to take place while crawling is underway. The search( ) method starts with these lines of code:
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// Start the search in a new thread. Thread thread = new Thread(new Runnable() { public void run() {
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To run the search code in a separate thread, a new Thread object is instantiated with a Runnable instance passed to its constructor. Instead of creating a separate class that implements the Runnable interface, the code is in-lined. Before the search starts, the interface controls are updated to indicate that crawling is underway, as shown here:
// Show hour glass cursor while crawling is under way. setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); // Disable search controls. startTextField.setEnabled(false); maxComboBox.setEnabled(false); limitCheckBox.setEnabled(false); logTextField.setEnabled(false); searchTextField.setEnabled(false); caseCheckBox.setEnabled(false); // Switch search button to "Stop." searchButton.setText("Stop");
First, the application s cursor is set to the WAIT_CURSOR to signify that the application is busy. On most operating systems, the WAIT_CURSOR is an hourglass. After the cursor has been set, each of the search interface controls is disabled by calling the setEnabled( ) method with a false flag on the control. Next, the Search button is changed to read Stop. The Search button is changed, because when searching is underway the button doubles as a control for stopping the current search. After disabling the search controls, the Stats section of the interface is reset, as shown here:
// Reset stats. table.setModel(new DefaultTableModel(new Object[][]{}, new String[]{"URL"}) { public boolean isCellEditable(int row, int column) { return false; } }); updateStats(startUrl, 0, 0, maxUrls);
First, the matches table s data model is reset by passing the setModel( ) method an all new, empty DefaultTableModel instance. Second, the updateStats( ) method is called to refresh the progress bar and the status labels. Next, the log file is opened and the crawling flag is turned on:
// Open matches log file. try { logFileWriter = new PrintWriter(new FileWriter(logFile)); } catch (Exception e) {
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showError("Unable to open matches log file."); return; } // Turn crawling flag on. crawling = true;
The log file is opened by way of creating a new PrintWriter instance for writing to the file. If the file cannot be opened, an error dialog box is displayed by calling showError( ). The crawling flag is set to true to indicate to the actionSearch( ) method that crawling is underway. The following code kicks off the actual search crawling by invoking the crawl( ) method:
// Perform the actual crawling. crawl(startUrl, maxUrls, limitCheckBox.isSelected(), searchString, caseCheckBox.isSelected());
After crawling has completed, the crawling flag is turned off and the matches log file is closed, as shown here:
// Turn crawling flag off. crawling = false; // Close matches log file. try { logFileWriter.close(); } catch (Exception e) { showError("Unable to close matches log file."); }
The crawling flag is set to false to indicate that crawling is no longer underway. Next, the matches log file is closed since crawling is finished. Similar to opening the file, if an exception is thrown while trying to close the file, an error dialog box will be shown with a call to showError( ). Because crawling is finished, the search controls are reactivated by the following code:
// Mark search as done. crawlingLabel2.setText("Done"); // Enable search controls. startTextField.setEnabled(true); maxComboBox.setEnabled(true); limitCheckBox.setEnabled(true); logTextField.setEnabled(true); searchTextField.setEnabled(true); caseCheckBox.setEnabled(true);
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