CronExpressionTest.java

/**
 * Copyright (c) 2014-2017 by the respective copyright holders.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.eclipse.smarthome.core.scheduler;

import static org.junit.Assert.assertEquals;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CronExpressionTest {

    private final Logger logger = LoggerFactory.getLogger(CronExpressionTest.class);

    @Test(expected = ParseException.class)
    public void garbageString() throws ParseException {
        new CronExpression("blahblahblah");
    }

    @Test(expected = IllegalArgumentException.class)
    public void dayOfWeekAndMonth() throws ParseException {
        new CronExpression("* * * ? * ?");
    }

    @Test
    public void getTimeAfterCheck() throws ParseException {

        Calendar cal = Calendar.getInstance();
        cal.set(2016, 0, 1, 0, 0, 0); // set to Jan 1st 2016, 00:00
        cal.set(Calendar.MILLISECOND, 0);
        Date startDate = cal.getTime();

        // Fire at 10:15am on the third Friday of every month
        CronExpression expr = new CronExpression("0 15 10 ? * 6#3", startDate);

        Date nextDate = expr.getTimeAfter(startDate);

        cal.set(2016, 0, 15, 10, 15, 0);
        cal.set(Calendar.MILLISECOND, 0);

        Date checkDate = cal.getTime();

        assertEquals(checkDate, nextDate);
    }

    @Test
    public void getFinalTimeCheck() throws ParseException {

        Calendar cal = Calendar.getInstance();
        cal.set(2016, 0, 1, 0, 0, 0); // set to Jan 1st 2016, 00:00
        cal.set(Calendar.MILLISECOND, 0);
        Date startDate = cal.getTime();

        // Fire at 10:15am on every last friday of every month during the years 2016 to 2020
        CronExpression expr = new CronExpression("0 15 10 ? * 6L 2016-2020", startDate);

        Date nextDate = expr.getFinalFireTime();

        cal.set(2020, 11, 25, 10, 15, 0);
        cal.set(Calendar.MILLISECOND, 0);

        Date checkDate = cal.getTime();

        assertEquals(checkDate, nextDate);
    }

    @Test
    public void findNext() throws ParseException {
        boolean trace = false;

        final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        final int TRIES = 150;

        final List<String> expressions = Arrays.asList(new String[] { //
                "* * * * * ?", //
                "* * * ? * *", //
                "0 * * ? * *", //
                "0 0 * ? * *", //
                "0 0 0 ? * *", //
                "0 15 07 * * ?", //
                "0 15 07 ? * MON,TUE,WED,THU,FRI,SAT,SUN" //
        });

        for (final String expr : expressions) {
            logger.info("Test cron expression: {}", expr);
            final CronExpression cronExpression;
            try {
                cronExpression = new CronExpression(expr);
            } catch (final IllegalArgumentException | ParseException ex) {
                logger.error("Error creating a new ConExpression", ex);
                throw ex;
            }

            Calendar cal = Calendar.getInstance();
            Date curDate = cal.getTime();

            for (int i = 0; i < TRIES; ++i) {
                if (trace) {
                    logger.info("Try to get time after: {}", sdf.format(curDate));
                }
                final Date nextDate = cronExpression.getTimeAfter(curDate);
                if (nextDate == null) {
                    final String msg = String.format("Cannot find a time after '%s' for expression '%s'",
                            sdf.format(curDate), cronExpression.getExpression());
                    logger.error(msg);
                    Assert.fail(msg);
                } else {
                    if (trace) {
                        logger.info("Got: " + sdf.format(nextDate));
                    }
                }

                cal.setTime(nextDate);
                // Add some offset
                cal.add(Calendar.MINUTE, 1);
                cal.add(Calendar.SECOND, 1);
                curDate = cal.getTime();
            }
        }
    }

}