ca.sqlpower.dao.session.FormatConverter.java Source code

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Here is the source code for ca.sqlpower.dao.session.FormatConverter.java

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/*
 * Copyright (c) 2009, SQL Power Group Inc.
 *
 * This file is part of SQL Power Library.
 *
 * SQL Power Library 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.
 *
 * SQL Power Library 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 this program.  If not, see <http://www.gnu.org/licenses/>. 
 */

package ca.sqlpower.dao.session;

import java.text.DecimalFormat;
import java.text.Format;
import java.text.SimpleDateFormat;

import org.apache.commons.beanutils.ConversionException;

import ca.sqlpower.dao.session.BidirectionalConverter;

public class FormatConverter implements BidirectionalConverter<String, Format> {

    public Format convertToComplexType(String convertFrom) throws ConversionException {

        //The patterns can contain the delimiter character.
        int firstSeparator = convertFrom.indexOf(DELIMITER);

        if (firstSeparator == -1) {
            throw new IllegalArgumentException("Cannot find the class type for the string " + convertFrom);
        }

        String className = convertFrom.substring(0, firstSeparator);
        String pattern = convertFrom.substring(firstSeparator + 1);

        if (className.equals(DecimalFormat.class.getSimpleName())) {
            return new DecimalFormat(pattern);
        } else if (className.equals(SimpleDateFormat.class.getSimpleName())) {
            return new SimpleDateFormat(pattern);
        } else {
            throw new IllegalStateException(
                    "Unknown class " + className + " to create a format on based on the pattern " + pattern);
        }
    }

    public String convertToSimpleType(Format convertFrom, Object... additionalInfo) {
        if (convertFrom instanceof DecimalFormat) {
            DecimalFormat decimal = (DecimalFormat) convertFrom;
            return DecimalFormat.class.getSimpleName() + DELIMITER + decimal.toPattern();
        } else if (convertFrom instanceof SimpleDateFormat) {
            SimpleDateFormat date = (SimpleDateFormat) convertFrom;
            return SimpleDateFormat.class.getSimpleName() + DELIMITER + date.toPattern();
        } else {
            throw new IllegalStateException("Unknown format to convert from " + convertFrom.getClass());
        }
    }

}