/* * [HexNumberFormatter.java] * * Summary: hex NumberFormatter for a JSpinner. * * Copyright: (c) 2007-2017 Roedy Green, Canadian Mind Products, http://mindprod.com * * Licence: This software may be copied and used freely for any purpose but military. * http://mindprod.com/contact/nonmil.html * * Requires: JDK 1.8+ * * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/ * * Version History: * 1.0 2007-08-15 Created with IntelliJ IDEA. */ package com.mindprod.jcolourchooser; import javax.swing.text.DefaultFormatter; import java.text.ParseException; /** * hex NumberFormatter for a JSpinner. * * @author Roedy Green, Canadian Mind Products * @version 1.0 2007-08-15 Created with IntelliJ IDEA. * @since 2007-08-15 */ public class HexNumberFormatter extends DefaultFormatter { // max chars with in hex digits. private final int width; /** * hex NumberFormatter for a JSpinner. *
* constructor * * * @param width how many chars wide is the field. */ public HexNumberFormatter( int width ) { if ( width > 7 ) { throw new IllegalArgumentException( "HexFormat width > 7" ); } this.width = width; } /** * Converts the passed in String into an instance ofgetValueClass
by way of the constructor that takes
* a String argument. If getValueClass
returns null, the Class of the current value in the
* JFormattedTextField
will be used. If this is null, a String will be returned. If the constructor
* thows an exception, a ParseException
will be thrown. If there is no single argument String
* constructor, string
will be returned.
*
* @param string String to convert
*
* @return Object representation of text, namely Integer
* @throws java.text.ParseException if there is an error in the conversion
*/
public Object stringToValue( String string ) throws ParseException
{
try
{
if ( string.length() > width )
{
throw new ParseException( "Max " + width + " digits allowed.",
0 );
}
return Integer.valueOf( string, 16 );
}
catch ( NumberFormatException nfe )
{
throw new ParseException( string, 0 );
}
}
/**
* Converts the passed in Object into a String by way of the toString
method.
*
* @param value Value to convert, Integer
*
* @return String representation of value, padded with left zeroes to width.
* @throws ParseException if there is an error in the conversion
*/
public String valueToString( Object value ) throws ParseException
{
final int asInt = ( Integer ) value;
final String hex = Integer.toHexString( asInt );
// apply lead zeroes as needed.
final int lz = width - hex.length();
if ( lz <= 0 )
{
return hex;
}
else
{
return "00000000".substring( 0, lz ) + hex;
}
}
}