se.softhouse.jargo.addons.DateTimeParser.java Source code

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Here is the source code for se.softhouse.jargo.addons.DateTimeParser.java

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/*
 * Copyright 2013 Jonatan Jnsson
 * 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 se.softhouse.jargo.addons;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormatter;
import org.joda.time.format.ISODateTimeFormat;
import se.softhouse.jargo.ArgumentException;
import se.softhouse.jargo.ArgumentExceptions;
import se.softhouse.jargo.StringParser;

import java.util.Locale;

import static java.util.Objects.requireNonNull;

/**
 * Parser for <a href="http://joda-time.sourceforge.net/">joda-time</a> {@link DateTime dates}
 */
final class DateTimeParser implements StringParser<DateTime> {
    private final DateTimeZone timeZone;
    private final DateTimeFormatter formatter;

    DateTimeParser(DateTimeZone timeZone) {
        this.timeZone = requireNonNull(timeZone);
        this.formatter = ISODateTimeFormat.dateOptionalTimeParser().withZone(timeZone);
    }

    @Override
    public String descriptionOfValidValues(Locale locale) {
        requireNonNull(locale);
        String unmistakableDate = new DateTime("2011-02-28", timeZone).toString(ISODateTimeFormat.dateTime());
        return "an ISO8601 date, such as " + unmistakableDate;
    }

    @Override
    public DateTime parse(final String value, Locale locale) throws ArgumentException {
        requireNonNull(locale);
        try {
            return DateTime.parse(value, formatter);
        } catch (IllegalArgumentException wrongDateFormat) {
            throw ArgumentExceptions.withMessage(wrongDateFormat.getLocalizedMessage());
        }
    }

    @Override
    public DateTime defaultValue() {
        return DateTime.now(timeZone);
    }

    @Override
    public String metaDescription() {
        return "<date>";
    }
}