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