001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.progmodel.facets.value.datetimejodalocal;
021
022import java.util.List;
023import java.util.StringTokenizer;
024
025import com.google.common.collect.Iterables;
026
027import org.joda.time.LocalDateTime;
028import org.joda.time.format.DateTimeFormatter;
029
030import org.apache.isis.applib.profiles.Localization;
031import org.apache.isis.core.metamodel.facets.object.parseable.TextEntryParseException;
032import org.apache.isis.core.progmodel.facets.value.JodaFunctions;
033
034public final class JodaLocalDateTimeUtil  {
035
036    private JodaLocalDateTimeUtil(){}
037    
038    static LocalDateTime parseDate(final String dateStr, final Localization localization, List<DateTimeFormatter> parseFormatters) {
039        Iterable<DateTimeFormatter> elements = Iterables.transform(parseFormatters, JodaFunctions.withLocale(localization));
040        return parseDateTime(dateStr, elements);
041    }
042
043    
044    private static LocalDateTime parseDateTime(String dateStr, Iterable<DateTimeFormatter> formatters) {
045        for(DateTimeFormatter formatter: formatters) {
046            try {
047                return formatter.parseLocalDateTime(dateStr);
048            } catch (final IllegalArgumentException e) {
049                // continue to next
050            }
051        }
052        throw new TextEntryParseException("Not recognised as a date: " + dateStr);
053    }
054
055    // //////////////////////////////////////
056
057    
058    static LocalDateTime relativeDateTime(final LocalDateTime contextDate, final String str, final boolean add) {
059        LocalDateTime relativeDate = contextDate;
060        if (str.equals("")) {
061            return contextDate;
062        }
063
064        try {
065            final StringTokenizer st = new StringTokenizer(str.substring(1), " ");
066            while (st.hasMoreTokens()) {
067                final String token = st.nextToken();
068                relativeDate = adjustDateTime(relativeDate, token, add);
069            }
070            return relativeDate;
071        } catch (final Exception e) {
072            return contextDate;
073        }
074    }
075
076    private static LocalDateTime adjustDateTime(final LocalDateTime contextDateTime, String str, final boolean add) {
077        int hours = 0;
078        int minutes = 0;
079        int days = 0;
080        int months = 0;
081        int years = 0;
082
083        if (str.endsWith("H")) {
084            str = str.substring(0, str.length() - 1);
085            hours = Integer.valueOf(str).intValue();
086        } else if (str.endsWith("M")) {
087            str = str.substring(0, str.length() - 1);
088            minutes = Integer.valueOf(str).intValue();
089        } else if (str.endsWith("w")) {
090            str = str.substring(0, str.length() - 1);
091            days = 7 * Integer.valueOf(str).intValue();
092        } else if (str.endsWith("y")) {
093            str = str.substring(0, str.length() - 1);
094            years = Integer.valueOf(str).intValue();
095        } else if (str.endsWith("m")) {
096            str = str.substring(0, str.length() - 1);
097            months = Integer.valueOf(str).intValue();
098        } else if (str.endsWith("d")) {
099            str = str.substring(0, str.length() - 1);
100            days = Integer.valueOf(str).intValue();
101        } else {
102            days = Integer.valueOf(str).intValue();
103        }
104
105        if (add) {
106            return add(contextDateTime, years, months, days, hours, minutes);
107        } else {
108            return add(contextDateTime, -years, -months, -days, -hours, -minutes);
109        }
110    }
111
112    private static LocalDateTime add(final LocalDateTime original, final int years, final int months, final int days, final int hours, final int minutes) {
113        return original.plusYears(years).plusMonths(months).plusDays(days).plusHours(hours).plusMinutes(minutes);
114    }
115
116
117    // //////////////////////////////////////
118
119    public static String titleString(final DateTimeFormatter formatter, final LocalDateTime date) {
120        return date == null ? "" : formatter.print(date);
121    }
122
123
124}