EuroField.java

/*
 * This file is part of jHaushalt.
 * jHaushalt is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * jHaushalt is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with jHaushalt; if not, see <http://www.gnu.org/licenses/>.
 * (C)opyright 2002-2010 Dr. Lars H. Hahn
 */

package haushalt.gui;

import haushalt.daten.Euro;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.PlainDocument;

/**
 * Textfeld um Euro-Werte zu editieren.
 * 0€ werden als leeres Feld angezeigt.
 * Bei der Eingabe werden keine Buchstaben akzeptiert.
 * 
 * @author Dr. Lars H. Hahn
 * @version 2.6/2009.07.28
 */

/*
 * 2009.07.28 Eingabe des Plus-Zeichens ('+') erlaubt
 * 2007.02.12 Hinzufügen der Methode getValue()
 * 2004.08.22 Version 2.0
 */

public class EuroField extends DeleteableTextField {

	private static final long serialVersionUID = 1L;

	public EuroField() {
		this(new Euro());
	}

	public EuroField(final Euro euro) {
		super("" + euro, 8);
	}

	public Euro getValue() {
		return new Euro(getText());
	}

	@Override
	public void setText(String text) {
		if (text.equals("" + Euro.NULL_EURO)) {
			text = "";
		}
		super.setText(text);
	}

	@Override
	protected Document createDefaultModel() {
		return new EuroDocument();
	}

	private static class EuroDocument extends PlainDocument {

		private static final long serialVersionUID = 1L;

		@Override
		public void insertString(final int offs, final String str, final AttributeSet a) throws BadLocationException {
			final char[] source = str.toCharArray();
			final int anzChar = source.length;
			final char[] result = new char[anzChar];
			int j = 0;

			for (int i = 0; i < anzChar; i++) {
				final boolean isEuroSign = "€".equals(String.valueOf(source[i]));
				final boolean isDigit = Character.isDigit(source[i]);
				final boolean isOperator = (source[i] == '-') || (source[i] == '+');
				final boolean isDecimalPoint = (source[i] == '.') || (source[i] == ',');
				final boolean isSpace = source[i] == ' ';
				if (isDigit || isEuroSign || isOperator || isSpace || isDecimalPoint) {
					result[j++] = source[i];
				}
			}
			super.insertString(offs, new String(result, 0, j), a);
		}
	}
}