net.zcarioca.zcommons.config.data.DatePropertyConverter.java Source code

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Here is the source code for net.zcarioca.zcommons.config.data.DatePropertyConverter.java

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/*
 * Project: zlib-config
 * 
 * Copyright (C) 2013 zcarioca.net
 * 
 * This program 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.
 * 
 * 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 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 net.zcarioca.zcommons.config.data;

import java.lang.annotation.Annotation;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;

import net.zcarioca.zcommons.config.ConfigurableDateFormat;
import net.zcarioca.zcommons.config.exceptions.ConfigurationException;

import org.apache.commons.lang.StringUtils;

/**
 * Converts a {@link Date} property.
 * 
 * @author zcarioca
 */
class DatePropertyConverter implements BeanPropertyConverter<Date> {

    /**
     * {@inheritDoc}
     */
    @Override
    public Class<?> getSupportedClass() {
        return Date.class;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Date convertPropertyValue(String value, BeanPropertyInfo beanPropertyInfo)
            throws ConfigurationException {
        SimpleDateFormat simpleDateFormat = getSimpleDateFormat(beanPropertyInfo);
        if (simpleDateFormat == null) {
            throw new ConfigurationException(String.format(
                    "To convert a value to a date the field '%s' or class '%s' must be annotated with an @ConfigurableDateFormat",
                    beanPropertyInfo.getPropertyName(), beanPropertyInfo.getBeanType().getSimpleName()));
        }

        try {
            return StringUtils.isBlank(value) ? null : simpleDateFormat.parse(value);
        } catch (ParseException exc) {
            throw new ConfigurationException(
                    String.format("Could not format property %s of %s, value %s did not fit provided format %s",
                            beanPropertyInfo.getPropertyName(), beanPropertyInfo.getBeanType().getSimpleName(),
                            value, simpleDateFormat.toPattern()));
        }
    }

    SimpleDateFormat getSimpleDateFormat(BeanPropertyInfo beanPropertyInfo) throws ConfigurationException {
        ConfigurableDateFormat format = null;
        try {
            format = getConfigurableDateFormat(beanPropertyInfo.getPropertyAnnotations());
            if (format == null) {
                format = getConfigurableDateFormat(beanPropertyInfo.getBeanAnnotations());
            }

            if (format != null) {
                return new SimpleDateFormat(format.value());
            }
        } catch (NullPointerException exc) {
            throw new ConfigurationException(
                    String.format("@ConfigurableDateFormat requires a format to be specified for property %s.%s",
                            beanPropertyInfo.getBeanType().getSimpleName(), beanPropertyInfo.getPropertyName()));
        } catch (IllegalArgumentException exc) {
            throw new ConfigurationException(
                    String.format("%s is not a valid format for the @ConfigurableDateFormat for property %s.%s",
                            format == null ? null : format.value(), beanPropertyInfo.getBeanType().getSimpleName(),
                            beanPropertyInfo.getPropertyName()));
        }
        return null;
    }

    ConfigurableDateFormat getConfigurableDateFormat(Collection<Annotation> annotations) {
        for (Annotation annotation : annotations) {
            if (annotation instanceof ConfigurableDateFormat) {
                return (ConfigurableDateFormat) annotation;
            }
        }
        return null;
    }

}