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package bjc.utils.gui;
import java.awt.Component;
import java.io.File;
import javax.swing.JFileChooser;
import bjc.utils.exceptions.FileNotChosenException;
/**
* Utility class for easily prompting user for files.
*
* Built for Swing.
*
* @author ben
*
*/
public class SimpleFileChooser {
private static File doOpenFile(Component parent, String title,
JFileChooser files) {
if (title == null) {
throw new NullPointerException("Title must not be null");
}
files.setDialogTitle(title);
boolean success = false;
while (!success) {
try {
maybeDoOpenFile(parent, files);
success = true;
} catch (FileNotChosenException e) {
SimpleDialogs.showError(parent, "I/O Error",
"Please pick a file to open");
}
}
return files.getSelectedFile();
}
private static File doSaveFile(Component parent, String title,
JFileChooser files) {
if (title == null) {
throw new NullPointerException("Title must not be null");
}
files.setDialogTitle(title);
boolean success = false;
while (!success) {
try {
maybeDoSaveFile(parent, files);
return files.getSelectedFile();
} catch (FileNotChosenException e) {
SimpleDialogs.showError(parent, "I/O Error",
"Please pick a file to save to");
}
}
return files.getSelectedFile();
}
/**
* Prompt the user with a "Open File..." dialog. Keeps prompting them
* until they pick a file.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @return The file the user has chosen.
*/
public static File getOpenFile(Component parent, String title) {
JFileChooser files = new JFileChooser();
return doOpenFile(parent, title, files);
}
/**
* Prompt the user with a "Open File..." dialog. Keeps prompting them
* until they pick a file.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @param extensions
* The list of file extensions the file should have.
* @return The file the user has chosen.
*/
public static File getOpenFile(Component parent, String title,
String... extensions) {
JFileChooser files = new JFileChooser();
files.addChoosableFileFilter(new ExtensionFileFilter(extensions));
return doOpenFile(parent, title, files);
}
/**
* Prompt the user with a "Save File..." dialog.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @return The file the user chose.
*/
public static File getSaveFile(Component parent, String title) {
JFileChooser files = new JFileChooser();
return doSaveFile(parent, title, files);
}
/**
* Prompt the user with a "Save File..." dialog.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @param extensions
* The extensions of the files the user can choose.
* @return The file the user chose.
*/
public static File getSaveFile(Component parent, String title,
String... extensions) {
JFileChooser files = new JFileChooser();
files.addChoosableFileFilter(new ExtensionFileFilter(extensions));
return doSaveFile(parent, title, files);
}
private static void maybeDoOpenFile(Component parent,
JFileChooser files) throws FileNotChosenException {
if (parent == null) {
throw new NullPointerException("Parent must not be null");
} else if (files == null) {
throw new NullPointerException(
"File chooser must not be null");
}
int dialogResult = files.showSaveDialog(parent);
if (dialogResult != JFileChooser.APPROVE_OPTION) {
throw new FileNotChosenException();
}
}
private static void maybeDoSaveFile(Component parent,
JFileChooser files) throws FileNotChosenException {
if (parent == null) {
throw new NullPointerException("Parent must not be null");
} else if (files == null) {
throw new NullPointerException(
"File chooser must not be null");
}
int dialogResult = files.showSaveDialog(parent);
if (dialogResult != JFileChooser.APPROVE_OPTION) {
throw new FileNotChosenException();
}
}
/**
* Prompt the user with a "Open File..." dialog.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @return The file if the user chose one or null if they didn't.
*/
public static File maybeOpenFile(Component parent, String title) {
if (title == null) {
throw new NullPointerException("Title must not be null");
}
JFileChooser files = new JFileChooser();
files.setDialogTitle(title);
try {
maybeDoOpenFile(parent, files);
} catch (FileNotChosenException e) {
}
return files.getSelectedFile();
}
/**
* Prompt the user with a "Save File..." dialog.
*
* @param parent
* The component to use as the parent for the dialog.
* @param title
* The title of the dialog to prompt with.
* @return The file if the user chose one or null if they didn't.
*/
public static File maybeSaveFile(Component parent, String title) {
if (title == null) {
throw new NullPointerException("Title must not be null");
}
JFileChooser files = new JFileChooser();
files.setDialogTitle(title);
try {
maybeDoSaveFile(parent, files);
} catch (FileNotChosenException e) {
}
return files.getSelectedFile();
}
}
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