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AgroSense util swing - Swing specific utility classes
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/**
 * Copyright (C) 2008-2013 LimeTri. All rights reserved.
 *
 * AgroSense 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.
 *
 * There are special exceptions to the terms and conditions of the GPLv3 as it is applied to
 * this software, see the FLOSS License Exception
 * .
 *
 * AgroSense 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 AgroSense.  If not, see .
 */
package nl.cloudfarming.client.util.swing.beanbinding;

import java.text.DecimalFormat;
import org.jdesktop.beansbinding.Converter;

/**
 * Converts String to double If String cannot be converted set's the value to
 * {@link Double#MIN_VALUE} This is used by the {@link DoubleValidator}
 *
 * Works in conjunction with {@link DoubleConverter}

 *
 *  Usage:

 *
 * yourBinding.setConverter(new {@link DoubleConverter}());

 * yourBinding.setValidator(new {@link DoubleValidator}()); 
 *
 * @author Merijn Zengers
 */
public class DoubleConverter extends Converter {

    private Integer numberOfFractions;

    public DoubleConverter() {
    }

    /**
     * Constructs a Double converter with the number of digits after the
     * separator specified. Will use this in the convertForward
     *
     * @param numberOfFractions
     */
    public DoubleConverter(Integer numberOfFractions) {
        this.numberOfFractions = numberOfFractions;
    }

    /**
     * Convert a Double to a String
     *
     * @param arg
     * @return
     */
    @Override
    public String convertForward(Double arg) {
        if (numberOfFractions != null) {
            DecimalFormat format = new DecimalFormat();
            format.setMaximumFractionDigits(numberOfFractions);
            return format.format(arg);
        }
        return String.valueOf(arg);
    }

    /**
     * Convert a String to a {@link Double}
     *
     * If not able to convert the string to {@link Double} will return {@link Double#MIN_VALUE}
     *
     * @param arg
     * @return converted String value or {@link Double#MIN_VALUE} if a {@link NumberFormatException}
     * occurs
     */
    @Override
    public Double convertReverse(String arg) {
        double value;
        try {
            value = (arg == null || arg.isEmpty()) ? 0 : Double.parseDouble(arg);
        } catch (NumberFormatException ex) {
            value = Double.MIN_VALUE;
        }
        return value;
    }
}