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Java example source code file (ChronoLocalDateTime.java)
The ChronoLocalDateTime.java Java example source code/* * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * This file is available under and governed by the GNU General Public * License version 2 only, as published by the Free Software Foundation. * However, the following notice accompanied the original version of this * file: * * Copyright (c) 2007-2012, Stephen Colebourne & Michael Nascimento Santos * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * * Neither the name of JSR-310 nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package java.time.chrono; import static java.time.temporal.ChronoField.EPOCH_DAY; import static java.time.temporal.ChronoField.NANO_OF_DAY; import static java.time.temporal.ChronoUnit.FOREVER; import static java.time.temporal.ChronoUnit.NANOS; import java.time.DateTimeException; import java.time.Instant; import java.time.LocalDateTime; import java.time.LocalTime; import java.time.ZoneId; import java.time.ZoneOffset; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoField; import java.time.temporal.ChronoUnit; import java.time.temporal.Temporal; import java.time.temporal.TemporalAccessor; import java.time.temporal.TemporalAdjuster; import java.time.temporal.TemporalAmount; import java.time.temporal.TemporalField; import java.time.temporal.TemporalQueries; import java.time.temporal.TemporalQuery; import java.time.temporal.TemporalUnit; import java.time.zone.ZoneRules; import java.util.Comparator; import java.util.Objects; /** * A date-time without a time-zone in an arbitrary chronology, intended * for advanced globalization use cases. * <p> * <b>Most applications should declare method signatures, fields and variables * as {@link LocalDateTime}, not this interface.</b> * <p> * A {@code ChronoLocalDateTime} is the abstract representation of a local date-time * where the {@code Chronology chronology}, or calendar system, is pluggable. * The date-time is defined in terms of fields expressed by {@link TemporalField}, * where most common implementations are defined in {@link ChronoField}. * The chronology defines how the calendar system operates and the meaning of * the standard fields. * * <h3>When to use this interface * The design of the API encourages the use of {@code LocalDateTime} rather than this * interface, even in the case where the application needs to deal with multiple * calendar systems. The rationale for this is explored in detail in {@link ChronoLocalDate}. * <p> * Ensure that the discussion in {@code ChronoLocalDate} has been read and understood * before using this interface. * * @implSpec * This interface must be implemented with care to ensure other classes operate correctly. * All implementations that can be instantiated must be final, immutable and thread-safe. * Subclasses should be Serializable wherever possible. * * @param <D> the concrete type for the date of this date-time * @since 1.8 */ public interface ChronoLocalDateTime<D extends ChronoLocalDate> extends Temporal, TemporalAdjuster, Comparable<ChronoLocalDateTime { /** * Gets a comparator that compares {@code ChronoLocalDateTime} in * time-line order ignoring the chronology. * <p> * This comparator differs from the comparison in {@link #compareTo} in that it * only compares the underlying date-time and not the chronology. * This allows dates in different calendar systems to be compared based * on the position of the date-time on the local time-line. * The underlying comparison is equivalent to comparing the epoch-day and nano-of-day. * * @return a comparator that compares in time-line order ignoring the chronology * * @see #isAfter * @see #isBefore * @see #isEqual */ static Comparator<ChronoLocalDateTime timeLineOrder() { return AbstractChronology.DATE_TIME_ORDER; } //----------------------------------------------------------------------- /** * Obtains an instance of {@code ChronoLocalDateTime} from a temporal object. * <p> * This obtains a local date-time based on the specified temporal. * A {@code TemporalAccessor} represents an arbitrary set of date and time information, * which this factory converts to an instance of {@code ChronoLocalDateTime}. * <p> * The conversion extracts and combines the chronology and the date-time * from the temporal object. The behavior is equivalent to using * {@link Chronology#localDateTime(TemporalAccessor)} with the extracted chronology. * Implementations are permitted to perform optimizations such as accessing * those fields that are equivalent to the relevant objects. * <p> * This method matches the signature of the functional interface {@link TemporalQuery} * allowing it to be used as a query via method reference, {@code ChronoLocalDateTime::from}. * * @param temporal the temporal object to convert, not null * @return the date-time, not null * @throws DateTimeException if unable to convert to a {@code ChronoLocalDateTime} * @see Chronology#localDateTime(TemporalAccessor) */ static ChronoLocalDateTime<?> from(TemporalAccessor temporal) { if (temporal instanceof ChronoLocalDateTime) { return (ChronoLocalDateTime<?>) temporal; } Objects.requireNonNull(temporal, "temporal"); Chronology chrono = temporal.query(TemporalQueries.chronology()); if (chrono == null) { throw new DateTimeException("Unable to obtain ChronoLocalDateTime from TemporalAccessor: " + temporal.getClass()); } return chrono.localDateTime(temporal); } //----------------------------------------------------------------------- /** * Gets the chronology of this date-time. * <p> * The {@code Chronology} represents the calendar system in use. * The era and other fields in {@link ChronoField} are defined by the chronology. * * @return the chronology, not null */ default Chronology getChronology() { return toLocalDate().getChronology(); } /** * Gets the local date part of this date-time. * <p> * This returns a local date with the same year, month and day * as this date-time. * * @return the date part of this date-time, not null */ D toLocalDate() ; /** * Gets the local time part of this date-time. * <p> * This returns a local time with the same hour, minute, second and * nanosecond as this date-time. * * @return the time part of this date-time, not null */ LocalTime toLocalTime(); /** * Checks if the specified field is supported. * <p> * This checks if the specified field can be queried on this date-time. * If false, then calling the {@link #range(TemporalField) range}, * {@link #get(TemporalField) get} and {@link #with(TemporalField, long)} * methods will throw an exception. * <p> * The set of supported fields is defined by the chronology and normally includes * all {@code ChronoField} date and time fields. * <p> * If the field is not a {@code ChronoField}, then the result of this method * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)} * passing {@code this} as the argument. * Whether the field is supported is determined by the field. * * @param field the field to check, null returns false * @return true if the field can be queried, false if not */ @Override boolean isSupported(TemporalField field); /** * Checks if the specified unit is supported. * <p> * This checks if the specified unit can be added to or subtracted from this date-time. * If false, then calling the {@link #plus(long, TemporalUnit)} and * {@link #minus(long, TemporalUnit) minus} methods will throw an exception. * <p> * The set of supported units is defined by the chronology and normally includes * all {@code ChronoUnit} units except {@code FOREVER}. * <p> * If the unit is not a {@code ChronoUnit}, then the result of this method * is obtained by invoking {@code TemporalUnit.isSupportedBy(Temporal)} * passing {@code this} as the argument. * Whether the unit is supported is determined by the unit. * * @param unit the unit to check, null returns false * @return true if the unit can be added/subtracted, false if not */ @Override default boolean isSupported(TemporalUnit unit) { if (unit instanceof ChronoUnit) { return unit != FOREVER; } return unit != null && unit.isSupportedBy(this); } //----------------------------------------------------------------------- // override for covariant return type /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override default ChronoLocalDateTime<D> with(TemporalAdjuster adjuster) { return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.with(adjuster)); } /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override ChronoLocalDateTime<D> with(TemporalField field, long newValue); /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override default ChronoLocalDateTime<D> plus(TemporalAmount amount) { return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.plus(amount)); } /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override ChronoLocalDateTime<D> plus(long amountToAdd, TemporalUnit unit); /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override default ChronoLocalDateTime<D> minus(TemporalAmount amount) { return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amount)); } /** * {@inheritDoc} * @throws DateTimeException {@inheritDoc} * @throws ArithmeticException {@inheritDoc} */ @Override default ChronoLocalDateTime<D> minus(long amountToSubtract, TemporalUnit unit) { return ChronoLocalDateTimeImpl.ensureValid(getChronology(), Temporal.super.minus(amountToSubtract, unit)); } //----------------------------------------------------------------------- /** * Queries this date-time using the specified query. * <p> * This queries this date-time using the specified query strategy object. * The {@code TemporalQuery} object defines the logic to be used to * obtain the result. Read the documentation of the query to understand * what the result of this method will be. * <p> * The result of this method is obtained by invoking the * {@link java.time.temporal.TemporalQuery#queryFrom(TemporalAccessor)} method on the * specified query passing {@code this} as the argument. * * @param <R> the type of the result * @param query the query to invoke, not null * @return the query result, null may be returned (defined by the query) * @throws DateTimeException if unable to query (defined by the query) * @throws ArithmeticException if numeric overflow occurs (defined by the query) */ @SuppressWarnings("unchecked") @Override default <R> R query(TemporalQuery Other Java examples (source code examples)Here is a short list of links related to this Java ChronoLocalDateTime.java source code file: |
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