/*
 *
 * This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
 * Authors: Bruno Lowagie, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
 * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
 * OF THIRD PARTY RIGHTS
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * a covered work must retain the producer line in every PDF that is created
 * or manipulated using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */
package com.itextpdf.text.zugferd.checkers;

/**
 * Provide a means to check if a String consist of characters from 0 to 9
 * and a decimal point in case a decimal is expected.
 */
public class NumberChecker extends CodeValidation {

    public final static int INTEGER = 0;
    public final static int ANY_DECIMALS = 1;
    public final static int TWO_DECIMALS = 2;
    public final static int FOUR_DECIMALS = 4;
    
    /** The type of checker: INTEGER, ANY_DECIMALS, TWO_DECIMALS, FOUR_DECIMALS. */
    protected int type;
    
    /**
     * Creates a specific number checker.
     * @param type  the type of checker that needs to be created:
     * INTEGER, ANY_DECIMALS, TWO_DECIMALS, or FOUR_DECIMALS
     */
    public NumberChecker(int type) {
        this.type = type;
    }
    
    @Override
    public boolean isValid(String code) {
        if (type == INTEGER)
            return isNumeric(code, code.length());
        if (code.endsWith("."))
            return false;
        int pos = code.indexOf(".");
        if (pos < 1)
            return false;
        String part1 = code.substring(0, pos);
        if (!isNumeric(part1, part1.length()))
            return false;
        String part2 = code.substring(pos + 1);
        switch(type) {
            case TWO_DECIMALS:
                return isNumeric(part2, 2);
            case FOUR_DECIMALS:
                return isNumeric(part2, 4);
            default:
                return isNumeric(part2, part2.length());
        }
    }
    
}
