d40e63ee47
This also incorporates a bunch of changes to the previous script; this one requires no setup, can be run from anywhere, and leaves no droppings. Change-Id: I38f299f03e33950d2a64e9336f4ba7cb3c5cf6f0
273 lines
8.3 KiB
Java
273 lines
8.3 KiB
Java
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.TimeZone;
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/**
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* Copied from ZoneInfo and ZoneInfoDB in dalvik.
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* {@hide}
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*/
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public class ZoneInfo extends TimeZone {
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private static final long MILLISECONDS_PER_DAY = 24 * 60 * 60 * 1000;
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private static final long MILLISECONDS_PER_400_YEARS =
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MILLISECONDS_PER_DAY * (400 * 365 + 100 - 3);
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private static final long UNIX_OFFSET = 62167219200000L;
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private static final int[] NORMAL = new int[] {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334,
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};
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private static final int[] LEAP = new int[] {
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0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335,
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};
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private static String nullName(byte[] data, int where, int off) {
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if (off < 0)
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return null;
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int end = where + off;
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while (end < data.length && data[end] != '\0')
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end++;
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return new String(data, where + off, end - (where + off));
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}
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public static ZoneInfo make(String name, byte[] data) {
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int ntransition = read4(data, 32);
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int ngmtoff = read4(data, 36);
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int base = 44;
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int[] transitions = new int[ntransition];
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for (int i = 0; i < ntransition; i++)
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transitions[i] = read4(data, base + 4 * i);
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base += 4 * ntransition;
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byte[] type = new byte[ntransition];
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for (int i = 0; i < ntransition; i++)
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type[i] = data[base + i];
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base += ntransition;
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int[] gmtoff = new int[ngmtoff];
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byte[] isdst = new byte[ngmtoff];
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byte[] abbrev = new byte[ngmtoff];
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for (int i = 0; i < ngmtoff; i++) {
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gmtoff[i] = read4(data, base + 6 * i);
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isdst[i] = data[base + 6 * i + 4];
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abbrev[i] = data[base + 6 * i + 5];
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}
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base += 6 * ngmtoff;
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return new ZoneInfo(name, transitions, type, gmtoff, isdst, abbrev, data, base);
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}
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private static int read4(byte[] data, int off) {
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return ((data[off ] & 0xFF) << 24) |
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((data[off + 1] & 0xFF) << 16) |
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((data[off + 2] & 0xFF) << 8) |
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((data[off + 3] & 0xFF) << 0);
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}
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/*package*/ ZoneInfo(String name, int[] transitions, byte[] type,
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int[] gmtoff, byte[] isdst, byte[] abbrev,
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byte[] data, int abbrevoff) {
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mTransitions = transitions;
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mTypes = type;
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mGmtOffs = gmtoff;
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mIsDsts = isdst;
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mUseDst = false;
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setID(name);
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// Find the latest GMT and non-GMT offsets for their abbreviations
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int lastdst;
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for (lastdst = mTransitions.length - 1; lastdst >= 0; lastdst--) {
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if (mIsDsts[mTypes[lastdst] & 0xFF] != 0)
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break;
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}
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int laststd;
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for (laststd = mTransitions.length - 1; laststd >= 0; laststd--) {
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if (mIsDsts[mTypes[laststd] & 0xFF] == 0)
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break;
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}
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if (lastdst >= 0) {
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mDaylightName = nullName(data, abbrevoff,
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abbrev[mTypes[lastdst] & 0xFF]);
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}
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if (laststd >= 0) {
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mStandardName = nullName(data, abbrevoff,
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abbrev[mTypes[laststd] & 0xFF]);
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}
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// Use the latest non-DST offset if any as the raw offset
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if (laststd < 0) {
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laststd = 0;
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}
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if (laststd >= mTypes.length) {
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mRawOffset = mGmtOffs[0];
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} else {
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mRawOffset = mGmtOffs[mTypes[laststd] & 0xFF];
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}
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// Subtract the raw offset from all offsets so it can be changed
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// and affect them too.
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// Find whether there exist any observances of DST.
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for (int i = 0; i < mGmtOffs.length; i++) {
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mGmtOffs[i] -= mRawOffset;
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if (mIsDsts[i] != 0) {
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mUseDst = true;
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}
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}
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mRawOffset *= 1000;
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}
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@Override
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public int getOffset(@SuppressWarnings("unused") int era,
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int year, int month, int day,
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@SuppressWarnings("unused") int dayOfWeek,
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int millis) {
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// XXX This assumes Gregorian always; Calendar switches from
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// Julian to Gregorian in 1582. What calendar system are the
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// arguments supposed to come from?
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long calc = (year / 400) * MILLISECONDS_PER_400_YEARS;
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year %= 400;
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calc += year * (365 * MILLISECONDS_PER_DAY);
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calc += ((year + 3) / 4) * MILLISECONDS_PER_DAY;
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if (year > 0)
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calc -= ((year - 1) / 100) * MILLISECONDS_PER_DAY;
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boolean isLeap = (year == 0 || (year % 4 == 0 && year % 100 != 0));
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int[] mlen = isLeap ? LEAP : NORMAL;
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calc += mlen[month] * MILLISECONDS_PER_DAY;
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calc += (day - 1) * MILLISECONDS_PER_DAY;
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calc += millis;
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calc -= mRawOffset;
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calc -= UNIX_OFFSET;
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return getOffset(calc);
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}
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@Override
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public int getOffset(long when) {
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int unix = (int) (when / 1000);
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int trans = Arrays.binarySearch(mTransitions, unix);
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if (trans == ~0) {
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return mGmtOffs[0] * 1000 + mRawOffset;
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}
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if (trans < 0) {
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trans = ~trans - 1;
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}
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return mGmtOffs[mTypes[trans] & 0xFF] * 1000 + mRawOffset;
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}
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@Override
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public int getRawOffset() {
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return mRawOffset;
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}
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@Override
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public void setRawOffset(int off) {
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mRawOffset = off;
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}
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@Override
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public boolean inDaylightTime(Date when) {
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int unix = (int) (when.getTime() / 1000);
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int trans = Arrays.binarySearch(mTransitions, unix);
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if (trans == ~0) {
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return mIsDsts[0] != 0;
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}
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if (trans < 0) {
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trans = ~trans - 1;
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}
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return mIsDsts[mTypes[trans] & 0xFF] != 0;
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}
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@Override
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public boolean useDaylightTime() {
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return mUseDst;
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}
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private int mRawOffset;
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private int[] mTransitions;
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private int[] mGmtOffs;
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private byte[] mTypes;
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private byte[] mIsDsts;
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private boolean mUseDst;
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private String mDaylightName;
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private String mStandardName;
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (!(obj instanceof ZoneInfo)) {
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return false;
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}
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ZoneInfo other = (ZoneInfo) obj;
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return mUseDst == other.mUseDst
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&& (mDaylightName == null ? other.mDaylightName == null :
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mDaylightName.equals(other.mDaylightName))
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&& (mStandardName == null ? other.mStandardName == null :
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mStandardName.equals(other.mStandardName))
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&& mRawOffset == other.mRawOffset
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// Arrays.equals returns true if both arrays are null
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&& Arrays.equals(mGmtOffs, other.mGmtOffs)
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&& Arrays.equals(mIsDsts, other.mIsDsts)
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&& Arrays.equals(mTypes, other.mTypes)
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&& Arrays.equals(mTransitions, other.mTransitions);
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime * result + ((mDaylightName == null) ? 0 :
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mDaylightName.hashCode());
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result = prime * result + Arrays.hashCode(mGmtOffs);
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result = prime * result + Arrays.hashCode(mIsDsts);
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result = prime * result + mRawOffset;
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result = prime * result + ((mStandardName == null) ? 0 :
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mStandardName.hashCode());
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result = prime * result + Arrays.hashCode(mTransitions);
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result = prime * result + Arrays.hashCode(mTypes);
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result = prime * result + (mUseDst ? 1231 : 1237);
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return result;
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}
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}
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