323 lines
12 KiB
Java
323 lines
12 KiB
Java
/*
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* Copyright (c) 2012, 2016, 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) 2011-2012, 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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package java.time.format;
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import static java.time.temporal.ChronoField.EPOCH_DAY;
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import static java.time.temporal.ChronoField.INSTANT_SECONDS;
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import static java.time.temporal.ChronoField.OFFSET_SECONDS;
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import java.time.DateTimeException;
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import java.time.Instant;
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import java.time.ZoneId;
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import java.time.ZoneOffset;
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import java.time.chrono.ChronoLocalDate;
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import java.time.chrono.Chronology;
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import java.time.chrono.IsoChronology;
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import java.time.temporal.ChronoField;
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import java.time.temporal.TemporalAccessor;
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import java.time.temporal.TemporalField;
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import java.time.temporal.TemporalQueries;
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import java.time.temporal.TemporalQuery;
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import java.time.temporal.ValueRange;
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import java.util.Locale;
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import java.util.Objects;
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/**
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* Context object used during date and time printing.
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* <p>
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* This class provides a single wrapper to items used in the format.
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*
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* @implSpec
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* This class is a mutable context intended for use from a single thread.
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* Usage of the class is thread-safe within standard printing as the framework creates
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* a new instance of the class for each format and printing is single-threaded.
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*
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* @since 1.8
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*/
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final class DateTimePrintContext {
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/**
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* The temporal being output.
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*/
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private TemporalAccessor temporal;
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/**
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* The formatter, not null.
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*/
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private DateTimeFormatter formatter;
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/**
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* Whether the current formatter is optional.
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*/
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private int optional;
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/**
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* Creates a new instance of the context.
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*
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* @param temporal the temporal object being output, not null
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* @param formatter the formatter controlling the format, not null
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*/
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DateTimePrintContext(TemporalAccessor temporal, DateTimeFormatter formatter) {
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super();
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this.temporal = adjust(temporal, formatter);
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this.formatter = formatter;
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}
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private static TemporalAccessor adjust(final TemporalAccessor temporal, DateTimeFormatter formatter) {
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// normal case first (early return is an optimization)
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Chronology overrideChrono = formatter.getChronology();
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ZoneId overrideZone = formatter.getZone();
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if (overrideChrono == null && overrideZone == null) {
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return temporal;
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}
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// ensure minimal change (early return is an optimization)
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Chronology temporalChrono = temporal.query(TemporalQueries.chronology());
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ZoneId temporalZone = temporal.query(TemporalQueries.zoneId());
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if (Objects.equals(overrideChrono, temporalChrono)) {
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overrideChrono = null;
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}
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if (Objects.equals(overrideZone, temporalZone)) {
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overrideZone = null;
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}
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if (overrideChrono == null && overrideZone == null) {
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return temporal;
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}
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// make adjustment
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final Chronology effectiveChrono = (overrideChrono != null ? overrideChrono : temporalChrono);
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if (overrideZone != null) {
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// if have zone and instant, calculation is simple, defaulting chrono if necessary
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if (temporal.isSupported(INSTANT_SECONDS)) {
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Chronology chrono = Objects.requireNonNullElse(effectiveChrono, IsoChronology.INSTANCE);
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return chrono.zonedDateTime(Instant.from(temporal), overrideZone);
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}
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// block changing zone on OffsetTime, and similar problem cases
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if (overrideZone.normalized() instanceof ZoneOffset && temporal.isSupported(OFFSET_SECONDS) &&
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temporal.get(OFFSET_SECONDS) != overrideZone.getRules().getOffset(Instant.EPOCH).getTotalSeconds()) {
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throw new DateTimeException("Unable to apply override zone '" + overrideZone +
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"' because the temporal object being formatted has a different offset but" +
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" does not represent an instant: " + temporal);
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}
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}
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final ZoneId effectiveZone = (overrideZone != null ? overrideZone : temporalZone);
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final ChronoLocalDate effectiveDate;
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if (overrideChrono != null) {
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if (temporal.isSupported(EPOCH_DAY)) {
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effectiveDate = effectiveChrono.date(temporal);
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} else {
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// check for date fields other than epoch-day, ignoring case of converting null to ISO
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if (!(overrideChrono == IsoChronology.INSTANCE && temporalChrono == null)) {
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for (ChronoField f : ChronoField.values()) {
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if (f.isDateBased() && temporal.isSupported(f)) {
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throw new DateTimeException("Unable to apply override chronology '" + overrideChrono +
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"' because the temporal object being formatted contains date fields but" +
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" does not represent a whole date: " + temporal);
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}
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}
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}
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effectiveDate = null;
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}
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} else {
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effectiveDate = null;
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}
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// combine available data
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// this is a non-standard temporal that is almost a pure delegate
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// this better handles map-like underlying temporal instances
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return new TemporalAccessor() {
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@Override
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public boolean isSupported(TemporalField field) {
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if (effectiveDate != null && field.isDateBased()) {
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return effectiveDate.isSupported(field);
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}
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return temporal.isSupported(field);
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}
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@Override
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public ValueRange range(TemporalField field) {
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if (effectiveDate != null && field.isDateBased()) {
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return effectiveDate.range(field);
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}
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return temporal.range(field);
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}
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@Override
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public long getLong(TemporalField field) {
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if (effectiveDate != null && field.isDateBased()) {
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return effectiveDate.getLong(field);
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}
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return temporal.getLong(field);
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}
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@SuppressWarnings("unchecked")
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@Override
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public <R> R query(TemporalQuery<R> query) {
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if (query == TemporalQueries.chronology()) {
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return (R) effectiveChrono;
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}
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if (query == TemporalQueries.zoneId()) {
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return (R) effectiveZone;
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}
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if (query == TemporalQueries.precision()) {
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return temporal.query(query);
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}
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return query.queryFrom(this);
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}
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@Override
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public String toString() {
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return temporal +
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(effectiveChrono != null ? " with chronology " + effectiveChrono : "") +
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(effectiveZone != null ? " with zone " + effectiveZone : "");
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}
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};
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}
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//-----------------------------------------------------------------------
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/**
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* Gets the temporal object being output.
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*
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* @return the temporal object, not null
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*/
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TemporalAccessor getTemporal() {
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return temporal;
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}
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/**
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* Gets the locale.
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* <p>
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* This locale is used to control localization in the format output except
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* where localization is controlled by the DecimalStyle.
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*
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* @return the locale, not null
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*/
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Locale getLocale() {
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return formatter.getLocale();
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}
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/**
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* Gets the DecimalStyle.
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* <p>
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* The DecimalStyle controls the localization of numeric output.
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*
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* @return the DecimalStyle, not null
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*/
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DecimalStyle getDecimalStyle() {
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return formatter.getDecimalStyle();
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}
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//-----------------------------------------------------------------------
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/**
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* Starts the printing of an optional segment of the input.
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*/
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void startOptional() {
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this.optional++;
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}
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/**
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* Ends the printing of an optional segment of the input.
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*/
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void endOptional() {
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this.optional--;
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}
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/**
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* Gets a value using a query.
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*
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* @param query the query to use, not null
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* @return the result, null if not found and optional is true
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* @throws DateTimeException if the type is not available and the section is not optional
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*/
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<R> R getValue(TemporalQuery<R> query) {
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R result = temporal.query(query);
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if (result == null && optional == 0) {
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throw new DateTimeException("Unable to extract " +
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query + " from temporal " + temporal);
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}
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return result;
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}
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/**
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* Gets the value of the specified field.
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* <p>
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* This will return the value for the specified field.
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*
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* @param field the field to find, not null
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* @return the value, null if not found and optional is true
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* @throws DateTimeException if the field is not available and the section is not optional
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*/
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Long getValue(TemporalField field) {
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if (optional > 0 && !temporal.isSupported(field)) {
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return null;
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}
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return temporal.getLong(field);
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}
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//-----------------------------------------------------------------------
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/**
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* Returns a string version of the context for debugging.
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*
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* @return a string representation of the context, not null
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*/
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@Override
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public String toString() {
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return temporal.toString();
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}
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}
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