time.java

tinyos最新版

// Copyright (c) Corporation for National Research Initiatives

// An implementation of the Python standard time module.  Currently
// unimplemented:
//
// accept2dyear
// strptime()
//
// There may also be some incompatibilities in strftime(), because the Java
// tools for creating those formats don't always map to C's strftime()
// function.
//
// NOTE: This file is prepared for the JDK 1.2 APIs, however it is
// currently set up to compile cleanly under 1.1.
//
// If you would like to enable the JDK 1.2 behavior (perhaps because you
// are running under JDK 1.2 and would like to actually have stuff like
// time.tzname or time.altzone work correctly, just search for the string
// "XXXAPI" and stick a couple of double slashes at the beginning of each
// matching line.

package org.python.modules;

import org.python.core.*;
import java.text.DateFormatSymbols;
import java.text.DateFormat;
import java.lang.reflect.*;
import java.util.*;



class TimeFunctions extends PyBuiltinFunctionSet
{
    public TimeFunctions(String name, int index, int argcount) {
        super(name, index, argcount, argcount, false, null);
    }

    public PyObject __call__() {
        switch (index) {
        case 0:
            return Py.newFloat(time.time$());
        case 1:
            return Py.newFloat(time.clock$());
        default:
            throw argCountError(0);
        }
    }
}



public class time implements ClassDictInit
{
    public static PyString __doc__ = new PyString(
        "This module provides various functions to manipulate time values.\n"+
        "\n"+
        "There are two standard representations of time.  One is the "+
                "number\n"+
        "of seconds since the Epoch, in UTC (a.k.a. GMT).  It may be an "+
                "integer\n"+
        "or a floating point number (to represent fractions of seconds).\n"+
        "The Epoch is system-defined; on Unix, it is generally "+
                "January 1st, 1970.\n"+
        "The actual value can be retrieved by calling gmtime(0).\n"+
        "\n"+
        "The other representation is a tuple of 9 integers giving "+
                "local time.\n"+
        "The tuple items are:\n"+
        "  year (four digits, e.g. 1998)\n"+
        "  month (1-12)\n"+
        "  day (1-31)\n"+
        "  hours (0-23)\n"+
        "  minutes (0-59)\n"+
        "  seconds (0-59)\n"+
        "  weekday (0-6, Monday is 0)\n"+
        "  Julian day (day in the year, 1-366)\n"+
        "  DST (Daylight Savings Time) flag (-1, 0 or 1)\n"+
        "If the DST flag is 0, the time is given in the regular time zone;\n"+
        "if it is 1, the time is given in the DST time zone;\n"+
        "if it is -1, mktime() should guess based on the date and time.\n"+
        "\n"+
        "Variables:\n"+
        "\n"+
        "timezone -- difference in seconds between UTC and local "+
                "standard time\n"+
        "altzone -- difference in  seconds between UTC and local DST time\n"+
        "daylight -- whether local time should reflect DST\n"+
        "tzname -- tuple of (standard time zone name, DST time zone name)\n"+
        "\n"+
        "Functions:\n"+
        "\n"+
        "time() -- return current time in seconds since the Epoch "+
                "as a float\n"+
        "clock() -- return CPU time since process start as a float\n"+
        "sleep() -- delay for a number of seconds given as a float\n"+
        "gmtime() -- convert seconds since Epoch to UTC tuple\n"+
        "localtime() -- convert seconds since Epoch to local time tuple\n"+
        "asctime() -- convert time tuple to string\n"+
        "ctime() -- convert time in seconds to string\n"+
        "mktime() -- convert local time tuple to seconds since Epoch\n"+
        "strftime() -- convert time tuple to string according to "+
                "format specification\n"+
        "strptime() -- parse string to time tuple according to "+
                "format specification\n"
    );

    public static void classDictInit(PyObject dict) {
        dict.__setitem__("time", new TimeFunctions("time", 0, 0));
        dict.__setitem__("clock", new TimeFunctions("clock", 1, 0));

        // calculate the static variables tzname, timezone, altzone, daylight
        TimeZone tz = TimeZone.getDefault();

        tzname = new PyTuple(
            new PyObject[] {
                new PyString(getDisplayName(tz, false, 0)),
                new PyString(getDisplayName(tz, true, 0))
            });

        daylight = tz.useDaylightTime() ? 1 : 0;
        timezone = -tz.getRawOffset() / 1000;
        altzone = timezone - getDSTSavings(tz) / 1000;
    }

    public static double time$() {
        return System.currentTimeMillis()/1000.0;
    }

    private static double __initialclock__ = 0.0;
    public static double clock$() {
        if(__initialclock__ == 0.0) {
            // set on the first call
            __initialclock__ = time$();
        }
        return time$() - __initialclock__;
    }

    private static void throwValueError(String msg) {
        throw new PyException(Py.ValueError, new PyString(msg));
    }

    private static int item(PyTuple tup, int i) {
        // knows about and asserts format on tuple items.  See
        // documentation for Python's time module for details.
        int val = tup.__getitem__(i).__int__().getValue();
        boolean valid = true;
        switch (i) {
        case 0: break;                                  // year
        case 1: valid = (1 <= val && val <= 12); break; // month 1-12
        case 2: valid = (1 <= val && val <= 31); break; // day 1 - 31
        case 3: valid = (0 <= val && val <= 23); break; // hour 0 - 23
        case 4: valid = (0 <= val && val <= 59); break; // minute 0 - 59
        case 5: valid = (0 <= val && val <= 59); break; // second 0 - 59
        case 6: valid = (0 <= val && val <= 6);  break; // weekday 0 - 6
        case 7: valid = (1 <= val && val < 367); break; // julian day 1 - 366
        case 8: valid = (-1 <= val && val <= 1); break; // d.s. flag, -1,0,1
        }
        // raise a ValueError if not within range
        if (!valid) {
            String msg;
            switch (i) {
            case 1:
                msg = "month out of range (1-12)";
                break;
            case 2:
                msg = "day out of range (1-31)";
                break;
            case 3:
                msg = "hour out of range (0-23)";
                break;
            case 4:
                msg = "minute out of range (0-59)";
                break;
            case 5:
                msg = "second out of range (0-59)";
                break;
            case 6:
                msg = "day of week out of range (0-6)";
                break;
            case 7:
                msg = "day of year out of range (1-366)";
                break;
            case 8:
                msg = "daylight savings flag out of range (-1,0,1)";
                break;
            default:
                // make compiler happy
                msg = "ignore";
                break;
            }
            throwValueError(msg);
        }
        // Java's months are usually 0-11
        if (i == 1)
            val--;
        return val;
    }

    private static GregorianCalendar _tupletocal(PyTuple tup) {
        return new GregorianCalendar(item(tup, 0),
                                     item(tup, 1),
                                     item(tup, 2),
                                     item(tup, 3),
                                     item(tup, 4),
                                     item(tup, 5));
    }

    public static double mktime(PyTuple tup) {
        GregorianCalendar cal;
        try {
            cal = _tupletocal(tup);
        }
        catch (PyException e) {
            // CPython's mktime raises OverflowErrors... yuck!
            e.type = Py.OverflowError;
            throw e;
        }
        int dst = item(tup, 8);
        if (dst == 0 || dst == 1) {
            cal.set(Calendar.DST_OFFSET,
                    dst * getDSTSavings(cal.getTimeZone()));
        }
        return (double)cal.getTime().getTime()/1000.0;
    }

    protected static PyTuple _timefields(double secs, TimeZone tz) {
        GregorianCalendar cal = new GregorianCalendar(tz);
        cal.clear();
        cal.setTime(new Date((long)(secs*1000)));
        // This call used to be needed to work around JVM bugs.
        // It appears to break jdk1.2, so it's not removed.
        // cal.clear();
        int dow = cal.get(Calendar.DAY_OF_WEEK)-2;
        if (dow<0)
            dow = dow+7;
        // TBD: is this date dst?
        boolean isdst = tz.inDaylightTime(cal.getTime());
        return new PyTuple(new PyObject[] {
            new PyInteger(cal.get(Calendar.YEAR)),
            new PyInteger(cal.get(Calendar.MONTH)+1),
            new PyInteger(cal.get(Calendar.DAY_OF_MONTH)),
            new PyInteger(cal.get(Calendar.HOUR) +
                          12*cal.get(Calendar.AM_PM)),
            new PyInteger(cal.get(Calendar.MINUTE)),
            new PyInteger(cal.get(Calendar.SECOND)),
            new PyInteger(dow),
            new PyInteger(cal.get(Calendar.DAY_OF_YEAR)),
            new PyInteger(isdst ? 1 : 0)
        });
    }

    public static PyTuple localtime() {
        return localtime(time$());
    }

    public static PyTuple localtime(double secs) {
        return _timefields(secs, TimeZone.getDefault());
    }

    public static PyTuple gmtime() {
        return gmtime(time$());
    }

    public static PyTuple gmtime(double secs) {
        return _timefields(secs, TimeZone.getTimeZone("GMT"));
    }

    public static String ctime() {
        return ctime(time$());
    }

    public static String ctime(double secs) {
        return asctime(localtime(secs));
    }

    // Python's time module specifies use of current locale
    protected static Locale currentLocale = null;
    protected static DateFormatSymbols datesyms = new DateFormatSymbols();
    protected static String[] shortdays = null;
    protected static String[] shortmonths = null;

    private static String _shortday(int dow) {
        // we need to hand craft shortdays[] because Java and Python have
        // different specifications.  Java (undocumented) appears to be
        // first element "", followed by 0=Sun.  Python says 0=Mon
        try {
            if (shortdays == null) {
                shortdays = new String[7];
                String[] names = datesyms.getShortWeekdays();
                for (int i=0; i<6; i++)
                    shortdays[i] = names[i+2];
                shortdays[6] = names[1];
            }
        }
        catch (ArrayIndexOutOfBoundsException e) {
            throwValueError("day of week out of range (0-6)");
        }
        return shortdays[dow];
    }

    private static String _shortmonth(int month0to11) {
        // getShortWeekdays() returns a 13 element array with the last item
        // being the empty string.  This is also undocumented ;-/
        try {
            if (shortmonths == null) {
                shortmonths = new String[12];
                String[] names = datesyms.getShortMonths();