com.romeikat.datamessie.core.base.util.DateUtil.java Source code

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Here is the source code for com.romeikat.datamessie.core.base.util.DateUtil.java

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package com.romeikat.datamessie.core.base.util;

/*-
 * ============================LICENSE_START============================
 * data.messie (core)
 * =====================================================================
 * Copyright (C) 2013 - 2017 Dr. Raphael Romeikat
 * =====================================================================
 * 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/gpl-3.0.html>.
 * =============================LICENSE_END=============================
 */

import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.temporal.ChronoUnit;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import com.google.common.collect.Lists;

public class DateUtil {

    public static Date fromLocalDate(final LocalDate ld) {
        if (ld == null) {
            return null;
        }

        return Date.from(ld.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
    }

    public static LocalDate toLocalDate(final Date d) {
        if (d == null) {
            return null;
        }

        return LocalDateTime.ofInstant(d.toInstant(), ZoneId.systemDefault()).toLocalDate();
    }

    public static LocalDate toLocalDate(final LocalDateTime d) {
        if (d == null) {
            return null;
        }

        return d.toLocalDate();
    }

    public static LocalDate toLocalDate(final java.sql.Date d) {
        if (d == null) {
            return null;
        }

        return d.toLocalDate();
    }

    public static Date fromLocalDateTime(final LocalDateTime ldt) {
        if (ldt == null) {
            return null;
        }

        return Date.from(ldt.atZone(ZoneId.systemDefault()).toInstant());
    }

    public static LocalDateTime toLocalDateTime(final Date d) {
        if (d == null) {
            return null;
        }

        return LocalDateTime.ofInstant(d.toInstant(), ZoneId.systemDefault());
    }

    public static long getDelayUntil(final LocalDateTime ldt) {
        final LocalDateTime now = LocalDateTime.now();
        long delayInMillis = Duration.between(now, ldt).getSeconds() * 1000;
        if (delayInMillis <= 0) {
            delayInMillis = 0;
        }
        return delayInMillis;
    }

    public static List<LocalDate> getLocalDatesBetween(final LocalDate localDate1, final LocalDate localDate2) {
        if (localDate1 == null || localDate2 == null) {
            return Collections.emptyList();
        }

        if (localDate1.equals(localDate2)) {
            return Lists.newArrayList(localDate1);
        }

        final int daysBetween = (int) Math.abs(ChronoUnit.DAYS.between(localDate1, localDate2));
        final List<LocalDate> localDatesBetween = Lists.newArrayListWithExpectedSize(daysBetween + 1);

        // Add first date
        localDatesBetween.add(localDate1);
        // Add further dates
        final boolean ascending = localDate1.isBefore(localDate2);
        for (int i = 1; i <= daysBetween; i++) {
            final int offset = ascending ? i : -i;
            final LocalDate localDate = localDate1.plusDays(offset);
            localDatesBetween.add(localDate);
        }

        return localDatesBetween;
    }

}