StringToBigDecimalConverter.java

/*******************************************************************************
 * Copyright 2013 Thomas Letsch (contact@thomas-letsch.de)
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package org.vaadin.addons.javaee.fields.converter;

import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;

import org.apache.commons.lang.StringUtils;

import com.vaadin.data.util.converter.Converter;

public class StringToBigDecimalConverter implements Converter<String, BigDecimal> {

    private static final long serialVersionUID = 1L;

    private String formatPattern;

    public StringToBigDecimalConverter() {
    }

    public StringToBigDecimalConverter(String formatPattern) {
        this.formatPattern = formatPattern;
    }

    @Override
    public BigDecimal convertToModel(String value, Class<? extends BigDecimal> targetType, Locale locale)
            throws Converter.ConversionException {
        if (StringUtils.isBlank(value)) {
            return null;
        }
        value = value.replace(",", ".");
        BigDecimal result = new BigDecimal(value);
        return result;
    }

    @Override
    public String convertToPresentation(BigDecimal value, Class<? extends String> targetType, Locale locale)
            throws Converter.ConversionException {
        if (value == null) {
            return null;
        }

        if (locale == null) {
            locale = Locale.getDefault();
        }
        NumberFormat nf = null;
        if (formatPattern != null) {
            nf = new DecimalFormat(formatPattern);
        } else {
            nf = NumberFormat.getInstance(locale);
        }
        return nf.format(value.doubleValue());
    }

    @Override
    public Class<BigDecimal> getModelType() {
        return BigDecimal.class;
    }

    @Override
    public Class<String> getPresentationType() {
        return String.class;
    }

    public void setFormatPattern(String formatPattern) {
        this.formatPattern = formatPattern;
    }

}