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ZoneInfo.javaAPI DocAndroid 1.5 API7567Wed May 06 22:41:04 BST 2009org.apache.harmony.luni.internal.util

ZoneInfo

public class ZoneInfo extends TimeZone
{@hide}

Fields Summary
private static final long
MILLISECONDS_PER_DAY
private static final long
MILLISECONDS_PER_400_YEARS
private static final long
UNIX_OFFSET
private static final int[]
NORMAL
private static final int[]
LEAP
private int
mRawOffset
private int[]
mTransitions
private int[]
mGmtOffs
private byte[]
mTypes
private byte[]
mIsDsts
private boolean
mUseDst
private String
mDaylightName
private String
mStandardName
Constructors Summary
ZoneInfo(String name, int[] transitions, byte[] type, int[] gmtoff, byte[] isdst, byte[] abbrev, byte[] data, int abbrevoff)

        mTransitions = transitions;
        mTypes = type;
        mGmtOffs = gmtoff;
        mIsDsts = isdst;
        mUseDst = false;
        setID(name);

        // Find the latest GMT and non-GMT offsets for their abbreviations

        int lastdst;
        for (lastdst = mTransitions.length - 1; lastdst >= 0; lastdst--) {
            if (mIsDsts[mTypes[lastdst] & 0xFF] != 0)
                break;
        }

        int laststd;
        for (laststd = mTransitions.length - 1; laststd >= 0; laststd--) {
            if (mIsDsts[mTypes[laststd] & 0xFF] == 0)
                break;
        }

        if (lastdst >= 0) {
            mDaylightName = nullName(data, abbrevoff,
                                     abbrev[mTypes[lastdst] & 0xFF]);
        }
        if (laststd >= 0) {
            mStandardName = nullName(data, abbrevoff,
                                     abbrev[mTypes[laststd] & 0xFF]);
        }

        // Use the latest non-DST offset if any as the raw offset

        if (laststd < 0) {
            laststd = 0;
        }

        if (laststd >= mTypes.length) {
            mRawOffset = mGmtOffs[0];
        } else {
            mRawOffset = mGmtOffs[mTypes[laststd] & 0xFF];
        }

        // Subtract the raw offset from all offsets so it can be changed
        // and affect them too.
        // Find whether there exist any observances of DST.

        for (int i = 0; i < mGmtOffs.length; i++) {
            mGmtOffs[i] -= mRawOffset;

            if (mIsDsts[i] != 0) {
                mUseDst = true;
            }
        }

        mRawOffset *= 1000;
Methods Summary
public booleanequals(java.lang.Object obj)

        if (this == obj) {
            return true;
        }
        if (!(obj instanceof ZoneInfo)) {
           return false; 
        }
        ZoneInfo other = (ZoneInfo) obj;
        return mUseDst == other.mUseDst
                && (mDaylightName == null ? other.mDaylightName == null :
                        mDaylightName.equals(other.mDaylightName))
                && (mStandardName == null ? other.mStandardName == null :
                        mStandardName.equals(other.mStandardName))
                && mRawOffset == other.mRawOffset
                // Arrays.equals returns true if both arrays are null
                && Arrays.equals(mGmtOffs, other.mGmtOffs)
                && Arrays.equals(mIsDsts, other.mIsDsts)
                && Arrays.equals(mTypes, other.mTypes)
                && Arrays.equals(mTransitions, other.mTransitions);
public intgetOffset(int era, int year, int month, int day, int dayOfWeek, int millis)

        // XXX This assumes Gregorian always; Calendar switches from
        // Julian to Gregorian in 1582.  What calendar system are the
        // arguments supposed to come from?

        long calc = (year / 400) * MILLISECONDS_PER_400_YEARS;
        year %= 400;

        calc += year * (365 * MILLISECONDS_PER_DAY);
        calc += ((year + 3) / 4) * MILLISECONDS_PER_DAY;

        if (year > 0)
            calc -= ((year - 1) / 100) * MILLISECONDS_PER_DAY;

        boolean isLeap = (year == 0 || (year % 4 == 0 && year % 100 != 0));
        int[] mlen = isLeap ? LEAP : NORMAL;

        calc += mlen[month] * MILLISECONDS_PER_DAY;
        calc += (day - 1) * MILLISECONDS_PER_DAY;
        calc += millis;

        calc -= mRawOffset;
        calc -= UNIX_OFFSET;

        return getOffset(calc);
public intgetOffset(long when)

        int unix = (int) (when / 1000);
        int trans = Arrays.binarySearch(mTransitions, unix);

        if (trans == ~0) {
            return mGmtOffs[0] * 1000 + mRawOffset;
        }
        if (trans < 0) {
            trans = ~trans - 1;
        }

        return mGmtOffs[mTypes[trans] & 0xFF] * 1000 + mRawOffset;
public intgetRawOffset()

        return mRawOffset;
public static java.util.TimeZonegetTimeZone(java.lang.String name)


         
        if (name == null)
        {
            return null;
        }
        
        try {
            return ZoneInfoDB._getTimeZone(name);
        } catch (IOException e) {
            return null;
        }
public inthashCode()

        final int prime = 31;
        int result = 1;
        result = prime * result + ((mDaylightName == null) ? 0 :
                mDaylightName.hashCode());
        result = prime * result + Arrays.hashCode(mGmtOffs);
        result = prime * result + Arrays.hashCode(mIsDsts);
        result = prime * result + mRawOffset;
        result = prime * result + ((mStandardName == null) ? 0 :
                mStandardName.hashCode());
        result = prime * result + Arrays.hashCode(mTransitions);
        result = prime * result + Arrays.hashCode(mTypes);
        result = prime * result + (mUseDst ? 1231 : 1237);
        return result;
public booleaninDaylightTime(java.util.Date when)

        int unix = (int) (when.getTime() / 1000);
        int trans = Arrays.binarySearch(mTransitions, unix);

        if (trans == ~0) {
            return mIsDsts[0] != 0;
        }
        if (trans < 0) {
            trans = ~trans - 1;
        }

        return mIsDsts[mTypes[trans] & 0xFF] != 0;
private static java.lang.StringnullName(byte[] data, int where, int off)

        if (off < 0)
            return null;

        int end = where + off;
        while (end < data.length && data[end] != '\0")
            end++;

        return new String(data, where + off, end - (where + off));
public voidsetRawOffset(int off)

        mRawOffset = off;
public booleanuseDaylightTime()

        return mUseDst;