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