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A Java library for reading and writing iCalendar (*.ics) files

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/*
 *  Copyright (c) 2024, Ben Fortuna
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *   o Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *   o Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *
 *   o Neither the name of Ben Fortuna nor the names of any other contributors
 *  may be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package net.fortuna.ical4j.model;

import net.fortuna.ical4j.model.property.ExDate;
import net.fortuna.ical4j.model.property.RDate;
import net.fortuna.ical4j.model.property.RRule;

import java.util.function.BiFunction;

/**
 * A collection of functions used to modify date-time properties in a target property container.
 * Used in conjunction with {@link PropertyContainer#with(BiFunction, Object)}
 */
public interface RecurrencePropertyModifiers {

    BiFunction, PropertyContainer> EXDATE = (c, p) -> {
        if (p != null && !p.getDates().isEmpty()) c.add(new ExDate<>(p)); return c;
    };

    BiFunction, PropertyContainer> RDATE = (c, p) -> {
        if (p != null && !p.getDates().isEmpty()) c.add(new RDate<>(p)); return c;
    };

    BiFunction, PropertyContainer> RRULE = (c, p) -> {
        if (p != null) c.add(p); return c;
    };
}