ruleday.java

来自「This is a resource based on j2me embedde」· Java 代码 · 共 202 行

/*
 * @(#)RuleDay.java	1.6 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program 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. 
 * 
 * This program 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 at /legal/license.txt). 
 * 
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 */

package sun.tools.javazic;

import java.util.HashMap;

/**
 * RuleDay class represents the value of the "ON" field.  The day of
 * week values start from 1 following the {@link java.util.Calendar}
 * convention.
 *
 * @since 1.4
 */
class RuleDay {
    private static HashMap dayOfWeek = new HashMap();
    static {
	dayOfWeek.put("Sun", new Integer(1));
	dayOfWeek.put("Mon", new Integer(2));
	dayOfWeek.put("Tue", new Integer(3));
	dayOfWeek.put("Wed", new Integer(4));
	dayOfWeek.put("Thu", new Integer(5));
	dayOfWeek.put("Fri", new Integer(6));
	dayOfWeek.put("Sat", new Integer(7));
    }

    private String dayName = null;
    private int dow;
    private boolean lastOne = false;
    private int soonerOrLater = 0;
    private int thanDay;

    RuleDay() {
    }

    RuleDay(int day) {
	thanDay = day;
    }

    int getDay() {
	return thanDay;
    }

    /**
     * @return the day of week value (1-based)
     */
    int getDayOfWeek() {
	return dow;
    }

    /**
     * @return true if this rule day represents the last day of
     * week. (e.g., lastSun).
     */
    boolean isLast() {
	return lastOne;
    }

    /**
     * @return true if this rule day represents the day of week on or
     * later than (after) the {@link #getDay}. (e.g., Sun>=1)
     */
    boolean isLater() {
	return soonerOrLater > 0;
    }

    /**
     * @return true if this rule day represents the day of week on or
     * earlier than (before) the {@link #getDay}. (e.g., Sun<=15)
     */
    boolean isEarlier() {
	return soonerOrLater < 0;
    }

    /**
     * @return true if this rule day represents an exact day.
     */
    boolean isExact() {
	return soonerOrLater == 0;
    }

    /**
     * Parses the "ON" field and constructs a RuleDay.
     * @param day an "ON" field string (e.g., "Sun>=1")
     * @return a RuleDay representing the given "ON" field
     */
    static RuleDay parse(String day) {
	RuleDay d = new RuleDay();
	if (day.startsWith("last")) {
	    d.lastOne = true;
	    d.dayName = day.substring(4);
	    d.dow = getDOW(d.dayName);
	} else {
	    int index;
	    if ((index = day.indexOf(">=")) != -1) {
		d.dayName = day.substring(0, index);
		d.dow = getDOW(d.dayName);
		d.soonerOrLater = 1; // greater or equal
		d.thanDay = Integer.parseInt(day.substring(index+2));
	    } else if ((index = day.indexOf("<=")) != -1) {
		d.dayName = day.substring(0, index);
		d.dow = getDOW(d.dayName);
		d.soonerOrLater = -1; // less or equal
		d.thanDay = Integer.parseInt(day.substring(index+2));
	    } else {
		// it should be an integer value.
		d.thanDay = Integer.parseInt(day);
	    }
	}
	return d;
    }

    /**
     * Converts this RuleDay to the SimpleTimeZone day rule.
     * @return the converted SimpleTimeZone day rule
     */
    int getDayForSimpleTimeZone() {
	if (isLast()) {
	    return -1;
	}
	return getDay();
    }

    /**
     * Converts this RuleDay to the SimpleTimeZone day-of-week rule.
     * @return the SimpleTimeZone day-of-week rule value
     */
    int getDayOfWeekForSimpleTimeZoneInt() {
	if (!isLater() && !isEarlier() && !isLast()) {
	    return 0;
	}
	if (isLater()) {
	    return -getDayOfWeek();
	}
	return getDayOfWeek();
    }

    /**
     * @return the string representation of the {@link
     * #getDayOfWeekForSimpleTimeZoneInt} value
     */
    String getDayOfWeekForSimpleTimeZone() {
	int d = getDayOfWeekForSimpleTimeZoneInt();
	if (d == 0) {
	    return "0";
	}
	String sign = "";
	if (d < 0) {
	    sign = "-";
	    d = -d;
	}
	return sign + toString(d);
    }

    private static int getDOW(String name) {
	return ((Integer)dayOfWeek.get(name)).intValue();
    }

    private static final String upper_DayOfWeek[] = {
	"SUNDAY", "MONDAY", "TUESDAY", "WEDNESDAY", "THURSDAY", "FRIDAY",
	"SATURDAY"
    };

    /**
     * Converts the specified day of week value to the day-of-week
     * name defined in {@link java.util.Calenda}.
     * @param dow 1-based day of week value
     * @return the Calendar day of week name with "Calendar." prefix.
     * @throws IllegalArgumentException if the specified dow value is out of range.
     */
    static String toString(int dow) {
	--dow;
	if (dow >= 0 && dow <= 6) {
	    return "Calendar."+ upper_DayOfWeek[dow];
	}
	throw new IllegalArgumentException("wrong Day_of_Week number: " + (dow+1));
    }
}