asked on

Preventing Duplicate File names to disk.

I would like to add a test that checks for duplicate file names when i write to disk, I would like a dialog box that pops
up and says "File already exists, would you like to replace the existing File?". Also, I need a test that checks the combo box
to see if the file name already exists, i do not want the same name in the combo box twice.

OICSDisplay: Save(File file) A test must be included to prevent duplicate file names to be written to the script select combo box

/**
*Shows the save dialog window.
*/
public void scriptFileSave()
{
saveDialog.setVisible(true);
if (saveDialog.showSaveDialog(this) == JFileChooser.APPROVE_OPTION)
{
//Make sure the extension of the file is .script
File tempFile = saveDialog.getSelectedFile();
File finalFile;
String tempFileName = tempFile.getPath();
if(tempFileName.endsWith(".script"))
{
//File already ends with .script
finalFile = tempFile;
}
else
{
//File does not end with .script, change it
finalFile = new File(tempFileName + ".script");
}
scriptFileSave(finalFile);
}
}
/**
*When the save button is pushed in the Script Panel, this routine will save
*the contents of the list box which is contained in a vector to a file on the disk drive.
*/
private void scriptFileSave(File file)
{
try
{
// Write the objects stored in script vector to the specified file
ObjectOutputStream Script = new ObjectOutputStream(new FileOutputStream(file));
Script.writeObject(scriptVector);
Script.flush();
Script.close();
scriptSelectComboBox.addItem(file.getName());
scriptSelectComboBox.setSelectedItem(file.getName());
// Display the status of the save file operation in jlblStatus
jlblStatus.setForeground(blackForegroundText);
jlblStatus.setText(file.getName() + " SAVED ");
systemLogging.systemMessage("SCRIPT SAVED - " + file.getName());
}
catch (IOException ex)
{
jlblStatus.setForeground(redForegroundText);
jlblStatus.setText("ERROR SAVING " + file.getName());
systemLogging.systemMessage("SCRIPT SAVED ERROR - " + file.getName());
}
}

zzynx

The easiest first ;°)
>> i do not want the same name in the combo box twice.
Use a Set to avoid duplicates.

Set theSet = new HashSet();

if ( !theSet.contains(file.getName() ) {
scriptSelectComboBox.addItem(file.getName());
theSet.add(file.getName());
}

hugoitt

ASKER

thanks zzynx, that worked. Now I need help with the first part.

guitaristx

Are you talking about java.io.File.exists():
http://java.sun.com/j2se/1.5.0/docs/api/java/io/File.html#exists()
?

You're using java.io.File objects, right?

if(file.exists())
{
//file exists!! do something
}
else
{
//save the file, or whatever else needs done
}

hugoitt

ASKER

Actually guitaristx, I already know how to check if a file exists on the disk, the problem I'm having is how to create
a custom dialog that will alert the operator of the decision he is about to make. I'm using JFilechooser for my open and
save dialogs, don't quite know how to create a custom dialog.

The dialog would have a yes and no button and I would copy over the existing file on disk depending on the response.

thanks

ASKER CERTIFIED SOLUTION

zzynx

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hugoitt

ASKER

Thanks zzynx, that worked.

thanks for all the responses.

zzynx

Thank you