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A Java library to parse, migrate and validate crons as well as describe them in human readable language
There is a newer version: 9.2.1
/*
* Copyright 2014 jmrozanec
* 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.cronutils.descriptor;

import java.time.DayOfWeek;
import java.time.Month;
import java.time.format.TextStyle;
import java.util.ResourceBundle;

import com.cronutils.Function;
import com.cronutils.model.field.definition.DayOfWeekFieldDefinition;
import com.cronutils.model.field.definition.FieldDefinition;
import com.cronutils.model.field.expression.FieldExpression;
import com.cronutils.model.field.expression.On;

class DescriptionStrategyFactory {

    private DescriptionStrategyFactory() {
    }

    /**
     * Creates description strategy for days of week.
     *
     * @param bundle     - locale
     * @param expression - CronFieldExpression
     * @return - DescriptionStrategy instance, never null
     */
    public static DescriptionStrategy daysOfWeekInstance(final ResourceBundle bundle, final FieldExpression expression, final FieldDefinition definition) {

        final Function nominal = integer -> {
            final int diff = definition instanceof DayOfWeekFieldDefinition
                    ? DayOfWeek.MONDAY.getValue() - ((DayOfWeekFieldDefinition) definition).getMondayDoWValue().getMondayDoWValue()
                    : 0;
            return DayOfWeek.of(integer + diff < 1 ? 7 : integer + diff).getDisplayName(TextStyle.FULL, bundle.getLocale());
        };

        final NominalDescriptionStrategy dow = new NominalDescriptionStrategy(bundle, nominal, expression);

        dow.addDescription(fieldExpression -> {
            if (fieldExpression instanceof On) {
                final On on = (On) fieldExpression;
                switch (on.getSpecialChar().getValue()) {
                    case HASH:
                        return String.format("%s %s %s ", nominal.apply(on.getTime().getValue()), on.getNth(), bundle.getString("of_every_month"));
                    case L:
                        return String.format("%s %s %s ", bundle.getString("last"), nominal.apply(on.getTime().getValue()), bundle.getString("of_every_month"));
                    default:
                        return "";
                }
            }
            return "";
        });
        return dow;
    }

    /**
     * Creates description strategy for days of month.
     *
     * @param bundle     - locale
     * @param expression - CronFieldExpression
     * @return - DescriptionStrategy instance, never null
     */
    public static DescriptionStrategy daysOfMonthInstance(final ResourceBundle bundle, final FieldExpression expression) {
        final NominalDescriptionStrategy dom = new NominalDescriptionStrategy(bundle, null, expression);

        dom.addDescription(fieldExpression -> {
            if (fieldExpression instanceof On) {
                final On on = (On) fieldExpression;
                switch (on.getSpecialChar().getValue()) {
                    case W:
                        return String
                                .format("%s %s %s ", bundle.getString("the_nearest_weekday_to_the"), on.getTime().getValue(), bundle.getString("of_the_month"));
                    case L:
                        return bundle.getString("last_day_of_month");
                    case LW:
                        return bundle.getString("last_weekday_of_month");
                    default:
                        return "";
                }
            }
            return "";
        });
        return dom;
    }

    /**
     * Creates description strategy for months.
     *
     * @param bundle     - locale
     * @param expression - CronFieldExpression
     * @return - DescriptionStrategy instance, never null
     */
    public static DescriptionStrategy monthsInstance(final ResourceBundle bundle, final FieldExpression expression) {
        return new NominalDescriptionStrategy(bundle, integer -> Month.of(integer).getDisplayName(TextStyle.FULL, bundle.getLocale()), expression);
    }

    /**
     * Creates nominal description strategy.
     *
     * @param bundle     - locale
     * @param expression - CronFieldExpression
     * @return - DescriptionStrategy instance, never null
     */
    public static DescriptionStrategy plainInstance(final ResourceBundle bundle, final FieldExpression expression) {
        return new NominalDescriptionStrategy(bundle, null, expression);
    }

    /**
     * Creates description strategy for hh:mm:ss.
     *
     * @param bundle - locale
     * @return - DescriptionStrategy instance, never null
     */
    public static DescriptionStrategy hhMMssInstance(final ResourceBundle bundle, final FieldExpression hours,
            final FieldExpression minutes, final FieldExpression seconds) {
        return new TimeDescriptionStrategy(bundle, hours, minutes, seconds);
    }
}