/*
* -----------------------------------------------------------------------
* Copyright © 2013-2016 Meno Hochschild, <http://www.menodata.de/>
* -----------------------------------------------------------------------
* This file (HistoricalEraElement.java) is part of project Time4J.
*
* Time4J is free software: You can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* Time4J 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Time4J. If not, see <http://www.gnu.org/licenses/>.
* -----------------------------------------------------------------------
*/
package net.time4j.history;
import net.time4j.PlainDate;
import net.time4j.engine.AttributeQuery;
import net.time4j.engine.BasicElement;
import net.time4j.engine.ChronoDisplay;
import net.time4j.engine.ChronoElement;
import net.time4j.engine.ChronoEntity;
import net.time4j.engine.ChronoException;
import net.time4j.engine.Chronology;
import net.time4j.engine.ElementRule;
import net.time4j.format.Attributes;
import net.time4j.format.CalendarText;
import net.time4j.format.DisplayElement;
import net.time4j.format.NumericalElement;
import net.time4j.format.TextAccessor;
import net.time4j.format.TextElement;
import net.time4j.format.TextWidth;
import net.time4j.history.internal.HistoricAttribute;
import java.io.IOException;
import java.io.ObjectStreamException;
import java.text.ParsePosition;
import java.util.Locale;
/**
* <p>Allgemeines verstellbares chronologisches Element auf enum-Basis. </p>
*
* @author Meno Hochschild
* @since 3.0
*/
final class HistoricEraElement
extends DisplayElement<HistoricEra>
implements NumericalElement<HistoricEra>, TextElement<HistoricEra> {
//~ Statische Felder/Initialisierungen --------------------------------
private static final long serialVersionUID = 5200533417265981438L;
private static final Locale LATIN = new Locale("la");
//~ Instanzvariablen --------------------------------------------------
/**
* @serial associated chronological history
*/
private final ChronoHistory history;
//~ Konstruktoren -----------------------------------------------------
/**
* <p>Konstruiert ein neues Element mit den angegebenen Details. </p>
*
* @param history associated chronological history
*/
HistoricEraElement(ChronoHistory history) {
super("ERA");
this.history = history;
}
//~ Methoden ----------------------------------------------------------
@Override
public Class<HistoricEra> getType() {
return HistoricEra.class;
}
@Override
public char getSymbol() {
return 'G';
}
@Override
public HistoricEra getDefaultMinimum() {
return HistoricEra.BC;
}
@Override
public HistoricEra getDefaultMaximum() {
return HistoricEra.AD;
}
@Override
public boolean isDateElement() {
return true;
}
@Override
public boolean isTimeElement() {
return false;
}
@Override
public int numerical(HistoricEra value) {
return value.getValue();
}
@Override
public void print(
ChronoDisplay context,
Appendable buffer,
AttributeQuery attributes
) throws IOException {
buffer.append(this.accessor(attributes).print(context.get(this)));
}
@Override
public HistoricEra parse(
CharSequence text,
ParsePosition status,
AttributeQuery attributes
) {
return this.accessor(attributes).parse(
text,
status,
this.getType(),
attributes
);
}
@Override
protected <T extends ChronoEntity<T>> ElementRule<T, HistoricEra> derive(Chronology<T> chronology) {
if (chronology.isRegistered(PlainDate.COMPONENT)) {
return new Rule<>(this.history);
}
return null;
}
@Override
protected boolean doEquals(BasicElement<?> obj) {
return this.history.equals(((HistoricEraElement) obj).history);
}
private TextAccessor accessor(AttributeQuery attributes) {
TextWidth textWidth = attributes.get(Attributes.TEXT_WIDTH, TextWidth.WIDE);
if (attributes.get(HistoricAttribute.LATIN_ERA, Boolean.FALSE).booleanValue()) {
// NARROW and SHORT like ABBREVIATED
CalendarText cnames = CalendarText.getInstance("historic", LATIN);
return cnames.getTextForms(this, ((textWidth == TextWidth.WIDE) ? "w" : "a"));
}
CalendarText cnames =
CalendarText.getIsoInstance(attributes.get(Attributes.LANGUAGE, Locale.ROOT));
if (attributes.get(HistoricAttribute.COMMON_ERA, Boolean.FALSE).booleanValue()) {
// NARROW and SHORT like ABBREVIATED
return cnames.getTextForms(this, ((textWidth == TextWidth.WIDE) ? "w" : "a"), "alt");
}
return cnames.getEras(textWidth);
}
private Object readResolve() throws ObjectStreamException {
return this.history.era();
}
//~ Innere Klassen ----------------------------------------------------
private static class Rule<C extends ChronoEntity<C>>
implements ElementRule<C, HistoricEra> {
//~ Instanzvariablen ----------------------------------------------
private final ChronoHistory history;
//~ Konstruktoren -------------------------------------------------
Rule(ChronoHistory history) {
super();
this.history = history;
}
//~ Methoden ------------------------------------------------------
@Override
public HistoricEra getValue(C context) {
try {
return this.history.convert(context.get(PlainDate.COMPONENT)).getEra();
} catch (IllegalArgumentException iae) {
throw new ChronoException(iae.getMessage(), iae);
}
}
@Override
public HistoricEra getMinimum(C context) {
HistoricEra era = this.getValue(context);
if (era == HistoricEra.AD) {
return HistoricEra.BC;
} else {
return era;
}
}
@Override
public HistoricEra getMaximum(C context) {
HistoricEra era = this.getValue(context);
if (era == HistoricEra.BC) {
return HistoricEra.AD;
} else {
return era;
}
}
@Override
public boolean isValid(
C context,
HistoricEra value
) {
if (value == null) {
return false;
}
try {
HistoricDate hd = this.history.convert(context.get(PlainDate.COMPONENT));
return (hd.getEra() == value);
} catch (IllegalArgumentException iae) {
return false;
}
}
@Override
public C withValue(
C context,
HistoricEra value,
boolean lenient
) {
if (value != null) {
HistoricDate hd = this.history.convert(context.get(PlainDate.COMPONENT));
if (hd.getEra() == value) {
return context;
}
}
throw new IllegalArgumentException(value.name());
}
@Override
public ChronoElement<?> getChildAtFloor(C context) {
throw new UnsupportedOperationException("Never called.");
}
@Override
public ChronoElement<?> getChildAtCeiling(C context) {
throw new UnsupportedOperationException("Never called.");
}
}
}