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/*
 * Copyright 2000-2014 Vaadin Ltd.
 * 
 * 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 com.vaadin.data.util.converter;

import java.util.Date;
import java.util.Locale;

/**
 * A converter that converts from {@link Long} to {@link Date} and back.
 * 
 * @author Vaadin Ltd
 * @since 7.0
 */
public class DateToLongConverter implements Converter {

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.vaadin.data.util.converter.Converter#convertToModel(java.lang.Object,
     * java.lang.Class, java.util.Locale)
     */
    @Override
    public Long convertToModel(Date value, Class targetType,
            Locale locale) {
        if (value == null) {
            return null;
        }

        return value.getTime();
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.vaadin.data.util.converter.Converter#convertToPresentation(java.lang
     * .Object, java.lang.Class, java.util.Locale)
     */
    @Override
    public Date convertToPresentation(Long value,
            Class targetType, Locale locale) {
        if (targetType != getPresentationType()) {
            throw new ConversionException("Converter only supports "
                    + getPresentationType().getName() + " (targetType was "
                    + targetType.getName() + ")");
        }
        if (value == null) {
            return null;
        }

        return new Date(value);
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.vaadin.data.util.converter.Converter#getModelType()
     */
    @Override
    public Class getModelType() {
        return Long.class;
    }

    /*
     * (non-Javadoc)
     * 
     * @see com.vaadin.data.util.converter.Converter#getPresentationType()
     */
    @Override
    public Class getPresentationType() {
        return Date.class;
    }

}