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Diffstat (limited to 'src/main/java/org/apache/commons/lang3/time/CalendarUtils.java')
-rw-r--r-- | src/main/java/org/apache/commons/lang3/time/CalendarUtils.java | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/lang3/time/CalendarUtils.java b/src/main/java/org/apache/commons/lang3/time/CalendarUtils.java new file mode 100644 index 000000000..f2d986995 --- /dev/null +++ b/src/main/java/org/apache/commons/lang3/time/CalendarUtils.java @@ -0,0 +1,140 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 org.apache.commons.lang3.time; + +import java.util.Calendar; +import java.util.Locale; +import java.util.Map; +import java.util.Objects; + +/** + * Helps use {@link Calendar}s. + * + * @since 3.10 + */ +public class CalendarUtils { + + /** + * The singleton instance for {@link Calendar#getInstance()}. + */ + public static final CalendarUtils INSTANCE = new CalendarUtils(Calendar.getInstance()); + + /** + * Gets a CalendarUtils using the default time zone and specified locale. The <code>CalendarUtils</code> returned is based on the current time in the + * default time zone with the given locale. + * + * @param locale the locale for the week data + * @return a Calendar. + */ + static CalendarUtils getInstance(final Locale locale) { + return new CalendarUtils(Calendar.getInstance(locale), locale); + } + + private final Calendar calendar; + + private final Locale locale; + + /** + * Creates an instance for the given Calendar. + * + * @param calendar A Calendar. + */ + public CalendarUtils(final Calendar calendar) { + this(calendar, Locale.getDefault()); + } + + /** + * Creates an instance for the given Calendar. + * + * @param calendar A Calendar. + * @param locale A Locale. + */ + CalendarUtils(final Calendar calendar, final Locale locale) { + this.calendar = Objects.requireNonNull(calendar, "calendar"); + this.locale = Objects.requireNonNull(locale, "locale"); + } + /** + * Gets the current day of month. + * + * @return the current day of month. + */ + public int getDayOfMonth() { + return calendar.get(Calendar.DAY_OF_MONTH); + } + + /** + * Gets the current day of year. + * + * @return the current day of year. + * @since 3.13.0 + */ + public int getDayOfYear() { + return calendar.get(Calendar.DAY_OF_YEAR); + } + + /** + * Gets the current month. + * + * @return the current month. + */ + public int getMonth() { + return calendar.get(Calendar.MONTH); + } + + /** + * Gets month names in the requested style. + * @param style Must be a valid {@link Calendar#getDisplayNames(int, int, Locale)} month style. + * @return Styled names of months + */ + String[] getMonthDisplayNames(final int style) { + // Unfortunately standalone month names are not available in DateFormatSymbols, + // so we have to extract them. + final Map<String, Integer> displayNames = calendar.getDisplayNames(Calendar.MONTH, style, locale); + if (displayNames == null) { + return null; + } + final String[] monthNames = new String[displayNames.size()]; + displayNames.forEach((k, v) -> monthNames[v] = k); + return monthNames; + } + + /** + * Gets full standalone month names as used in "LLLL" date formatting. + * @return Long names of months + */ + String[] getStandaloneLongMonthNames() { + return getMonthDisplayNames(Calendar.LONG_STANDALONE); + } + + /** + * Gets short standalone month names as used in "LLLL" date formatting. + * @return Short names of months + */ + String[] getStandaloneShortMonthNames() { + return getMonthDisplayNames(Calendar.SHORT_STANDALONE); + } + + /** + * Gets the current year. + * + * @return the current year. + */ + public int getYear() { + return calendar.get(Calendar.YEAR); + } +} |