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package tim.prune.function.olc;
import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;
/**
* text field for holding an OLC code with validation
*/
public class OlcField extends JTextField
{
private static final int OLC_MAX_CHARS = 12;
/**
* Inner class to act as document for validation
*/
protected static class OlcDocument extends PlainDocument
{
/**
* Override the insert string method
* @param offs offset
* @param str string
* @param a attributes
* @throws BadLocationException on insert failure
*/
public void insertString(int offs, String str, AttributeSet a)
throws BadLocationException
{
if (str == null) {return;}
if (getLength() >= OLC_MAX_CHARS) return;
char[] source = str.toCharArray();
char[] result = new char[source.length];
int j = 0;
for (int i = 0; i < result.length && j < OLC_MAX_CHARS; i++) {
// ignore non-allowed characters
char c = Character.toUpperCase(source[i]);
if ("023456789CFGHJMPQRVWX+".indexOf(c) >= 0) {
result[j++] = c;
}
}
super.insertString(offs, new String(result, 0, j), a);
}
}
/**
* Constructor
*/
public OlcField()
{
super(OLC_MAX_CHARS);
setDocument(new OlcDocument());
}
}
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