com.jjlharrison.jollyday.parser.impl.FixedWeekdayRelativeToFixedParser.java Source code

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Here is the source code for com.jjlharrison.jollyday.parser.impl.FixedWeekdayRelativeToFixedParser.java

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/**
 * Copyright 2010 Sven Diedrichsen
 *
 * 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.jjlharrison.jollyday.parser.impl;

import java.util.Set;

import com.jjlharrison.jollyday.parser.AbstractHolidayParser;
import org.joda.time.LocalDate;

import com.jjlharrison.jollyday.Holiday;
import com.jjlharrison.jollyday.HolidayType;
import com.jjlharrison.config.FixedWeekdayRelativeToFixed;
import com.jjlharrison.config.Holidays;
import com.jjlharrison.config.When;

/**
 * Parses fixed weekday relative to fixed date.
 *
 * @author Sven Diedrichsen
 * @version $Id: $
 */
public class FixedWeekdayRelativeToFixedParser extends AbstractHolidayParser {

    /**
     * Parses the provided configuration and creates holidays for the provided
     * year.
     */
    public void parse(int year, Set<Holiday> holidays, final Holidays config) {
        for (FixedWeekdayRelativeToFixed f : config.getFixedWeekdayRelativeToFixed()) {
            if (!isValid(f, year)) {
                continue;
            }
            LocalDate day = calendarUtil.create(year, f.getDay());
            day = moveDateToFirstOccurenceOfWeekday(f, day);
            int days = determineNumberOfDays(f);
            day = f.getWhen() == When.AFTER ? day.plusDays(days) : day.minusDays(days);
            HolidayType type = xmlUtil.getType(f.getLocalizedType());
            holidays.add(new Holiday(day, f.getDescriptionPropertiesKey(), type));
        }
    }

    /**
     * Moves the day to the first/next occurrence of the weekday and direction specified
     * @param f the specification of the weekday and direction of movement
     * @param day the day to move
     * @return the day moved to the weekday and in the direction as specified
     */
    private LocalDate moveDateToFirstOccurenceOfWeekday(FixedWeekdayRelativeToFixed f, LocalDate day) {
        LocalDate movingDay = day;
        do {
            movingDay = f.getWhen() == When.AFTER ? movingDay.plusDays(1) : movingDay.minusDays(1);
        } while (movingDay.getDayOfWeek() != xmlUtil.getWeekday(f.getWeekday()));
        return movingDay;
    }

    /**
     * Determines the number of days to move from the XML enumeration.
     * @param f the enumeration value
     * @return the number of days
     */
    private int determineNumberOfDays(FixedWeekdayRelativeToFixed f) {
        switch (f.getWhich()) {
        case SECOND:
            return 7;
        case THIRD:
            return 14;
        case FOURTH:
            return 21;
        default:
            return 0;
        }
    }

}