160 lines
7.8 KiB
Java
160 lines
7.8 KiB
Java
/*
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of JSR-310 nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* <p>
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* Access to date and time using fields and units, and date time adjusters.
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* </p>
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* <p>
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* This package expands on the base package to provide additional functionality for
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* more powerful use cases. Support is included for:
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* </p>
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* <ul>
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* <li>Units of date-time, such as years, months, days and hours</li>
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* <li>Fields of date-time, such as month-of-year, day-of-week or hour-of-day</li>
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* <li>Date-time adjustment functions</li>
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* <li>Different definitions of weeks</li>
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* </ul>
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*
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* <h2>Fields and Units</h2>
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* <p>
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* Dates and times are expressed in terms of fields and units.
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* A unit is used to measure an amount of time, such as years, days or minutes.
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* All units implement {@link java.time.temporal.TemporalUnit}.
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* The set of well known units is defined in {@link java.time.temporal.ChronoUnit}, such as {@code DAYS}.
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* The unit interface is designed to allow application defined units.
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* </p>
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* <p>
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* A field is used to express part of a larger date-time, such as year, month-of-year or second-of-minute.
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* All fields implement {@link java.time.temporal.TemporalField}.
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* The set of well known fields are defined in {@link java.time.temporal.ChronoField}, such as {@code HOUR_OF_DAY}.
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* Additional fields are defined by {@link java.time.temporal.JulianFields}, {@link java.time.temporal.WeekFields}
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* and {@link java.time.temporal.IsoFields}.
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* The field interface is designed to allow application defined fields.
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* </p>
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* <p>
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* This package provides tools that allow the units and fields of date and time to be accessed
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* in a general way most suited for frameworks.
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* {@link java.time.temporal.Temporal} provides the abstraction for date time types that support fields.
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* Its methods support getting the value of a field, creating a new date time with the value of
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* a field modified, and querying for additional information, typically used to extract the offset or time-zone.
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* </p>
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* <p>
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* One use of fields in application code is to retrieve fields for which there is no convenience method.
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* For example, getting the day-of-month is common enough that there is a method on {@code LocalDate}
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* called {@code getDayOfMonth()}. However for more unusual fields it is necessary to use the field.
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* For example, {@code date.get(ChronoField.ALIGNED_WEEK_OF_MONTH)}.
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* The fields also provide access to the range of valid values.
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* </p>
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*
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* <h2>Adjustment and Query</h2>
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* <p>
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* A key part of the date-time problem space is adjusting a date to a new, related value,
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* such as the "last day of the month", or "next Wednesday".
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* These are modeled as functions that adjust a base date-time.
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* The functions implement {@link java.time.temporal.TemporalAdjuster} and operate on {@code Temporal}.
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* A set of common functions are provided in {@link java.time.temporal.TemporalAdjusters}.
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* For example, to find the first occurrence of a day-of-week after a given date, use
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* {@link java.time.temporal.TemporalAdjusters#next(DayOfWeek)}, such as
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* {@code date.with(next(MONDAY))}.
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* Applications can also define adjusters by implementing {@link java.time.temporal.TemporalAdjuster}.
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* </p>
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* <p>
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* The {@link java.time.temporal.TemporalAmount} interface models amounts of relative time.
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* </p>
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* <p>
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* In addition to adjusting a date-time, an interface is provided to enable querying via
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* {@link java.time.temporal.TemporalQuery}.
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* The most common implementations of the query interface are method references.
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* The {@code from(TemporalAccessor)} methods on major classes can all be used, such as
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* {@code LocalDate::from} or {@code Month::from}.
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* Further implementations are provided in {@link java.time.temporal.TemporalQueries} as static methods.
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* Applications can also define queries by implementing {@link java.time.temporal.TemporalQuery}.
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* </p>
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*
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* <h2>Weeks</h2>
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* <p>
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* Different locales have different definitions of the week.
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* For example, in Europe the week typically starts on a Monday, while in the US it starts on a Sunday.
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* The {@link java.time.temporal.WeekFields} class models this distinction.
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* </p>
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* <p>
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* The ISO calendar system defines an additional week-based division of years.
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* This defines a year based on whole Monday to Monday weeks.
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* This is modeled in {@link java.time.temporal.IsoFields}.
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* </p>
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*
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* <h2>Package specification</h2>
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* <p>
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* Unless otherwise noted, passing a null argument to a constructor or method in any class or interface
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* in this package will cause a {@link java.lang.NullPointerException NullPointerException} to be thrown.
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* The Javadoc "@param" definition is used to summarise the null-behavior.
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* The "@throws {@link java.lang.NullPointerException}" is not explicitly documented in each method.
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* </p>
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* <p>
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* All calculations should check for numeric overflow and throw either an {@link java.lang.ArithmeticException}
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* or a {@link java.time.DateTimeException}.
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* </p>
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* @since 1.8
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*/
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package java.time.temporal;
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