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/*
* Copyright (c) 2010, 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.
*/
package java.text;
import java.util.Calendar;
import static java.util.GregorianCalendar.*;
/**
* {@code CalendarBuilder} keeps field-value pairs for setting
* the calendar fields of the given {@code Calendar}. It has the
* {@link Calendar#FIELD_COUNT FIELD_COUNT}-th field for the week year
* support. Also {@code ISO_DAY_OF_WEEK} is used to specify
* {@code DAY_OF_WEEK} in the ISO day of week numbering.
*
* <p>{@code CalendarBuilder} retains the semantic of the pseudo
* timestamp for fields. {@code CalendarBuilder} uses a single
* int array combining fields[] and stamp[] of {@code Calendar}.
*
* @author Masayoshi Okutsu
*/
class CalendarBuilder {
/*
* Pseudo time stamp constants used in java.util.Calendar
*/
private static final int UNSET = 0;
private static final int COMPUTED = 1;
private static final int MINIMUM_USER_STAMP = 2;
private static final int MAX_FIELD = FIELD_COUNT + 1;
public static final int WEEK_YEAR = FIELD_COUNT;
public static final int ISO_DAY_OF_WEEK = 1000; // pseudo field index
// stamp[] (lower half) and field[] (upper half) combined
private final int[] field;
private int nextStamp;
private int maxFieldIndex;
CalendarBuilder() {
field = new int[MAX_FIELD * 2];
nextStamp = MINIMUM_USER_STAMP;
maxFieldIndex = -1;
}
CalendarBuilder set(int index, int value) {
if (index == ISO_DAY_OF_WEEK) {
index = DAY_OF_WEEK;
value = toCalendarDayOfWeek(value);
}
field[index] = nextStamp++;
field[MAX_FIELD + index] = value;
if (index > maxFieldIndex && index < FIELD_COUNT) {
maxFieldIndex = index;
}
return this;
}
CalendarBuilder addYear(int value) {
field[MAX_FIELD + YEAR] += value;
field[MAX_FIELD + WEEK_YEAR] += value;
return this;
}
boolean isSet(int index) {
if (index == ISO_DAY_OF_WEEK) {
index = DAY_OF_WEEK;
}
return field[index] > UNSET;
}
Calendar establish(Calendar cal) {
boolean weekDate = isSet(WEEK_YEAR)
&& field[WEEK_YEAR] > field[YEAR];
if (weekDate && !cal.isWeekDateSupported()) {
// Use YEAR instead
if (!isSet(YEAR)) {
set(YEAR, field[MAX_FIELD + WEEK_YEAR]);
}
weekDate = false;
}
cal.clear();
// Set the fields from the min stamp to the max stamp so that
// the field resolution works in the Calendar.
for (int stamp = MINIMUM_USER_STAMP; stamp < nextStamp; stamp++) {
for (int index = 0; index <= maxFieldIndex; index++) {
if (field[index] == stamp) {
cal.set(index, field[MAX_FIELD + index]);
break;
}
}
}
if (weekDate) {
int weekOfYear = isSet(WEEK_OF_YEAR) ? field[MAX_FIELD + WEEK_OF_YEAR] : 1;
int dayOfWeek = isSet(DAY_OF_WEEK) ?
field[MAX_FIELD + DAY_OF_WEEK] : cal.getFirstDayOfWeek();
if (!isValidDayOfWeek(dayOfWeek) && cal.isLenient()) {
if (dayOfWeek >= 8) {
dayOfWeek--;
weekOfYear += dayOfWeek / 7;
dayOfWeek = (dayOfWeek % 7) + 1;
} else {
while (dayOfWeek <= 0) {
dayOfWeek += 7;
weekOfYear--;
}
}
dayOfWeek = toCalendarDayOfWeek(dayOfWeek);
}
cal.setWeekDate(field[MAX_FIELD + WEEK_YEAR], weekOfYear, dayOfWeek);
}
return cal;
}
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("CalendarBuilder:[");
for (int i = 0; i < field.length; i++) {
if (isSet(i)) {
sb.append(i).append('=').append(field[MAX_FIELD + i]).append(',');
}
}
int lastIndex = sb.length() - 1;
if (sb.charAt(lastIndex) == ',') {
sb.setLength(lastIndex);
}
sb.append(']');
return sb.toString();
}
static int toISODayOfWeek(int calendarDayOfWeek) {
return calendarDayOfWeek == SUNDAY ? 7 : calendarDayOfWeek - 1;
}
static int toCalendarDayOfWeek(int isoDayOfWeek) {
if (!isValidDayOfWeek(isoDayOfWeek)) {
// adjust later for lenient mode
return isoDayOfWeek;
}
return isoDayOfWeek == 7 ? SUNDAY : isoDayOfWeek + 1;
}
static boolean isValidDayOfWeek(int dayOfWeek) {
return dayOfWeek > 0 && dayOfWeek <= 7;
}
}
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