package com.github.ltsopensource.core.commons.time;
import com.github.ltsopensource.core.commons.utils.Assert;
import java.text.DateFormatSymbols;
import java.text.FieldPosition;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* from commons-lang 为了性能
*/
public class FastDatePrinter {
private final String mPattern;
private final TimeZone mTimeZone;
private final Locale mLocale;
private transient Rule[] mRules;
private transient int mMaxLengthEstimate;
protected FastDatePrinter(final String pattern, final TimeZone timeZone, final Locale locale) {
mPattern = pattern;
mTimeZone = timeZone;
mLocale = locale;
init();
}
private void init() {
final List<Rule> rulesList = parsePattern();
mRules = rulesList.toArray(new Rule[rulesList.size()]);
int len = 0;
for (int i=mRules.length; --i >= 0; ) {
len += mRules[i].estimateLength();
}
mMaxLengthEstimate = len;
}
protected List<Rule> parsePattern() {
final DateFormatSymbols symbols = new DateFormatSymbols(mLocale);
final List<Rule> rules = new ArrayList<Rule>();
final String[] ERAs = symbols.getEras();
final String[] months = symbols.getMonths();
final String[] shortMonths = symbols.getShortMonths();
final String[] weekdays = symbols.getWeekdays();
final String[] shortWeekdays = symbols.getShortWeekdays();
final String[] AmPmStrings = symbols.getAmPmStrings();
final int length = mPattern.length();
final int[] indexRef = new int[1];
for (int i = 0; i < length; i++) {
indexRef[0] = i;
final String token = parseToken(mPattern, indexRef);
i = indexRef[0];
final int tokenLen = token.length();
if (tokenLen == 0) {
break;
}
Rule rule;
final char c = token.charAt(0);
switch (c) {
case 'G': // era designator (text)
rule = new TextField(Calendar.ERA, ERAs);
break;
case 'y': // year (number)
if (tokenLen == 2) {
rule = TwoDigitYearField.INSTANCE;
} else {
rule = selectNumberRule(Calendar.YEAR, tokenLen < 4 ? 4 : tokenLen);
}
break;
case 'M': // month in year (text and number)
if (tokenLen >= 4) {
rule = new TextField(Calendar.MONTH, months);
} else if (tokenLen == 3) {
rule = new TextField(Calendar.MONTH, shortMonths);
} else if (tokenLen == 2) {
rule = TwoDigitMonthField.INSTANCE;
} else {
rule = UnpaddedMonthField.INSTANCE;
}
break;
case 'd': // day in month (number)
rule = selectNumberRule(Calendar.DAY_OF_MONTH, tokenLen);
break;
case 'h': // hour in am/pm (number, 1..12)
rule = new TwelveHourField(selectNumberRule(Calendar.HOUR, tokenLen));
break;
case 'H': // hour in day (number, 0..23)
rule = selectNumberRule(Calendar.HOUR_OF_DAY, tokenLen);
break;
case 'm': // minute in hour (number)
rule = selectNumberRule(Calendar.MINUTE, tokenLen);
break;
case 's': // second in minute (number)
rule = selectNumberRule(Calendar.SECOND, tokenLen);
break;
case 'S': // millisecond (number)
rule = selectNumberRule(Calendar.MILLISECOND, tokenLen);
break;
case 'E': // day in week (text)
rule = new TextField(Calendar.DAY_OF_WEEK, tokenLen < 4 ? shortWeekdays : weekdays);
break;
case 'D': // day in year (number)
rule = selectNumberRule(Calendar.DAY_OF_YEAR, tokenLen);
break;
case 'F': // day of week in month (number)
rule = selectNumberRule(Calendar.DAY_OF_WEEK_IN_MONTH, tokenLen);
break;
case 'w': // week in year (number)
rule = selectNumberRule(Calendar.WEEK_OF_YEAR, tokenLen);
break;
case 'W': // week in month (number)
rule = selectNumberRule(Calendar.WEEK_OF_MONTH, tokenLen);
break;
case 'a': // am/pm marker (text)
rule = new TextField(Calendar.AM_PM, AmPmStrings);
break;
case 'k': // hour in day (1..24)
rule = new TwentyFourHourField(selectNumberRule(Calendar.HOUR_OF_DAY, tokenLen));
break;
case 'K': // hour in am/pm (0..11)
rule = selectNumberRule(Calendar.HOUR, tokenLen);
break;
case 'z': // time zone (text)
if (tokenLen >= 4) {
rule = new TimeZoneNameRule(mTimeZone, mLocale, TimeZone.LONG);
} else {
rule = new TimeZoneNameRule(mTimeZone, mLocale, TimeZone.SHORT);
}
break;
case 'Z': // time zone (value)
if (tokenLen == 1) {
rule = TimeZoneNumberRule.INSTANCE_NO_COLON;
} else {
rule = TimeZoneNumberRule.INSTANCE_COLON;
}
break;
case '\'': // literal text
final String sub = token.substring(1);
if (sub.length() == 1) {
rule = new CharacterLiteral(sub.charAt(0));
} else {
rule = new StringLiteral(sub);
}
break;
default:
throw new IllegalArgumentException("Illegal pattern component: " + token);
}
rules.add(rule);
}
return rules;
}
protected String parseToken(final String pattern, final int[] indexRef) {
final StringBuilder buf = new StringBuilder();
int i = indexRef[0];
final int length = pattern.length();
char c = pattern.charAt(i);
if (c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z') {
// Scan a run of the same character, which indicates a time
// pattern.
buf.append(c);
while (i + 1 < length) {
final char peek = pattern.charAt(i + 1);
if (peek == c) {
buf.append(c);
i++;
} else {
break;
}
}
} else {
// This will identify token as text.
buf.append('\'');
boolean inLiteral = false;
for (; i < length; i++) {
c = pattern.charAt(i);
if (c == '\'') {
if (i + 1 < length && pattern.charAt(i + 1) == '\'') {
// '' is treated as escaped '
i++;
buf.append(c);
} else {
inLiteral = !inLiteral;
}
} else if (!inLiteral &&
(c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z')) {
i--;
break;
} else {
buf.append(c);
}
}
}
indexRef[0] = i;
return buf.toString();
}
protected NumberRule selectNumberRule(final int field, final int padding) {
switch (padding) {
case 1:
return new UnpaddedNumberField(field);
case 2:
return new TwoDigitNumberField(field);
default:
return new PaddedNumberField(field, padding);
}
}
// Format methods
//-----------------------------------------------------------------------
public StringBuffer format(final Object obj, final StringBuffer toAppendTo, final FieldPosition pos) {
if (obj instanceof Date) {
return format((Date) obj, toAppendTo);
} else if (obj instanceof Calendar) {
return format((Calendar) obj, toAppendTo);
} else if (obj instanceof Long) {
return format(((Long) obj).longValue(), toAppendTo);
} else {
throw new IllegalArgumentException("Unknown class: " +
(obj == null ? "<null>" : obj.getClass().getName()));
}
}
public String format(final long millis) {
final Calendar c = newCalendar(); // hard code GregorianCalendar
c.setTimeInMillis(millis);
return applyRulesToString(c);
}
private String applyRulesToString(final Calendar c) {
return applyRules(c, new StringBuffer(mMaxLengthEstimate)).toString();
}
private GregorianCalendar newCalendar() {
// hard code GregorianCalendar
return new GregorianCalendar(mTimeZone, mLocale);
}
public String format(final Date date) {
final Calendar c = newCalendar(); // hard code GregorianCalendar
c.setTime(date);
return applyRulesToString(c);
}
public String format(final Calendar calendar) {
return format(calendar, new StringBuffer(mMaxLengthEstimate)).toString();
}
public StringBuffer format(final long millis, final StringBuffer buf) {
return format(new Date(millis), buf);
}
public StringBuffer format(final Date date, final StringBuffer buf) {
final Calendar c = newCalendar(); // hard code GregorianCalendar
c.setTime(date);
return applyRules(c, buf);
}
public StringBuffer format(final Calendar calendar, final StringBuffer buf) {
return applyRules(calendar, buf);
}
protected StringBuffer applyRules(final Calendar calendar, final StringBuffer buf) {
for (final Rule rule : mRules) {
rule.appendTo(buf, calendar);
}
return buf;
}
@Override
public boolean equals(final Object obj) {
if (obj instanceof FastDatePrinter == false) {
return false;
}
final FastDatePrinter other = (FastDatePrinter) obj;
return mPattern.equals(other.mPattern)
&& mTimeZone.equals(other.mTimeZone)
&& mLocale.equals(other.mLocale);
}
@Override
public int hashCode() {
return mPattern.hashCode() + 13 * (mTimeZone.hashCode() + 13 * mLocale.hashCode());
}
@Override
public String toString() {
return "FastDatePrinter[" + mPattern + "," + mLocale + "," + mTimeZone.getID() + "]";
}
private interface Rule {
int estimateLength();
void appendTo(StringBuffer buffer, Calendar calendar);
}
private interface NumberRule extends Rule {
void appendTo(StringBuffer buffer, int value);
}
private static class CharacterLiteral implements Rule {
private final char mValue;
CharacterLiteral(final char value) {
mValue = value;
}
@Override
public int estimateLength() {
return 1;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
buffer.append(mValue);
}
}
private static class StringLiteral implements Rule {
private final String mValue;
StringLiteral(final String value) {
mValue = value;
}
@Override
public int estimateLength() {
return mValue.length();
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
buffer.append(mValue);
}
}
private static class TextField implements Rule {
private final int mField;
private final String[] mValues;
TextField(final int field, final String[] values) {
mField = field;
mValues = values;
}
@Override
public int estimateLength() {
int max = 0;
for (int i=mValues.length; --i >= 0; ) {
final int len = mValues[i].length();
if (len > max) {
max = len;
}
}
return max;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
buffer.append(mValues[calendar.get(mField)]);
}
}
private static class UnpaddedNumberField implements NumberRule {
private final int mField;
UnpaddedNumberField(final int field) {
mField = field;
}
@Override
public int estimateLength() {
return 4;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
if (value < 10) {
buffer.append((char)(value + '0'));
} else if (value < 100) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
buffer.append(Integer.toString(value));
}
}
}
private static class UnpaddedMonthField implements NumberRule {
static final UnpaddedMonthField INSTANCE = new UnpaddedMonthField();
UnpaddedMonthField() {
super();
}
@Override
public int estimateLength() {
return 2;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.MONTH) + 1);
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
if (value < 10) {
buffer.append((char)(value + '0'));
} else {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
}
private static class PaddedNumberField implements NumberRule {
private final int mField;
private final int mSize;
PaddedNumberField(final int field, final int size) {
if (size < 3) {
// Should use UnpaddedNumberField or TwoDigitNumberField.
throw new IllegalArgumentException();
}
mField = field;
mSize = size;
}
@Override
public int estimateLength() {
return 4;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
if (value < 100) {
for (int i = mSize; --i >= 2; ) {
buffer.append('0');
}
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
int digits;
if (value < 1000) {
digits = 3;
} else {
Assert.isTrue(value > -1, "Negative values should not be possible");
digits = Integer.toString(value).length();
}
for (int i = mSize; --i >= digits; ) {
buffer.append('0');
}
buffer.append(Integer.toString(value));
}
}
}
private static class TwoDigitNumberField implements NumberRule {
private final int mField;
TwoDigitNumberField(final int field) {
mField = field;
}
@Override
public int estimateLength() {
return 2;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(mField));
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
if (value < 100) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
} else {
buffer.append(Integer.toString(value));
}
}
}
private static class TwoDigitYearField implements NumberRule {
static final TwoDigitYearField INSTANCE = new TwoDigitYearField();
TwoDigitYearField() {
super();
}
@Override
public int estimateLength() {
return 2;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.YEAR) % 100);
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
private static class TwoDigitMonthField implements NumberRule {
static final TwoDigitMonthField INSTANCE = new TwoDigitMonthField();
TwoDigitMonthField() {
super();
}
@Override
public int estimateLength() {
return 2;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
appendTo(buffer, calendar.get(Calendar.MONTH) + 1);
}
@Override
public final void appendTo(final StringBuffer buffer, final int value) {
buffer.append((char)(value / 10 + '0'));
buffer.append((char)(value % 10 + '0'));
}
}
private static class TwelveHourField implements NumberRule {
private final NumberRule mRule;
TwelveHourField(final NumberRule rule) {
mRule = rule;
}
@Override
public int estimateLength() {
return mRule.estimateLength();
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
int value = calendar.get(Calendar.HOUR);
if (value == 0) {
value = calendar.getLeastMaximum(Calendar.HOUR) + 1;
}
mRule.appendTo(buffer, value);
}
@Override
public void appendTo(final StringBuffer buffer, final int value) {
mRule.appendTo(buffer, value);
}
}
private static class TwentyFourHourField implements NumberRule {
private final NumberRule mRule;
TwentyFourHourField(final NumberRule rule) {
mRule = rule;
}
@Override
public int estimateLength() {
return mRule.estimateLength();
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
int value = calendar.get(Calendar.HOUR_OF_DAY);
if (value == 0) {
value = calendar.getMaximum(Calendar.HOUR_OF_DAY) + 1;
}
mRule.appendTo(buffer, value);
}
@Override
public void appendTo(final StringBuffer buffer, final int value) {
mRule.appendTo(buffer, value);
}
}
private static final ConcurrentMap<TimeZoneDisplayKey, String> cTimeZoneDisplayCache =
new ConcurrentHashMap<TimeZoneDisplayKey, String>(7);
static String getTimeZoneDisplay(final TimeZone tz, final boolean daylight, final int style, final Locale locale) {
final TimeZoneDisplayKey key = new TimeZoneDisplayKey(tz, daylight, style, locale);
String value = cTimeZoneDisplayCache.get(key);
if (value == null) {
// This is a very slow call, so cache the results.
value = tz.getDisplayName(daylight, style, locale);
final String prior = cTimeZoneDisplayCache.putIfAbsent(key, value);
if (prior != null) {
value= prior;
}
}
return value;
}
private static class TimeZoneNameRule implements Rule {
private final Locale mLocale;
private final int mStyle;
private final String mStandard;
private final String mDaylight;
TimeZoneNameRule(final TimeZone timeZone, final Locale locale, final int style) {
mLocale = locale;
mStyle = style;
mStandard = getTimeZoneDisplay(timeZone, false, style, locale);
mDaylight = getTimeZoneDisplay(timeZone, true, style, locale);
}
@Override
public int estimateLength() {
// We have no access to the Calendar object that will be passed to
// appendTo so base estimate on the TimeZone passed to the
// constructor
return Math.max(mStandard.length(), mDaylight.length());
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
final TimeZone zone = calendar.getTimeZone();
if (zone.useDaylightTime()
&& calendar.get(Calendar.DST_OFFSET) != 0) {
buffer.append(getTimeZoneDisplay(zone, true, mStyle, mLocale));
} else {
buffer.append(getTimeZoneDisplay(zone, false, mStyle, mLocale));
}
}
}
private static class TimeZoneNumberRule implements Rule {
static final TimeZoneNumberRule INSTANCE_COLON = new TimeZoneNumberRule(true);
static final TimeZoneNumberRule INSTANCE_NO_COLON = new TimeZoneNumberRule(false);
final boolean mColon;
TimeZoneNumberRule(final boolean colon) {
mColon = colon;
}
@Override
public int estimateLength() {
return 5;
}
@Override
public void appendTo(final StringBuffer buffer, final Calendar calendar) {
int offset = calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET);
if (offset < 0) {
buffer.append('-');
offset = -offset;
} else {
buffer.append('+');
}
final int hours = offset / (60 * 60 * 1000);
buffer.append((char)(hours / 10 + '0'));
buffer.append((char)(hours % 10 + '0'));
if (mColon) {
buffer.append(':');
}
final int minutes = offset / (60 * 1000) - 60 * hours;
buffer.append((char)(minutes / 10 + '0'));
buffer.append((char)(minutes % 10 + '0'));
}
}
private static class TimeZoneDisplayKey {
private final TimeZone mTimeZone;
private final int mStyle;
private final Locale mLocale;
TimeZoneDisplayKey(final TimeZone timeZone,
final boolean daylight, final int style, final Locale locale) {
mTimeZone = timeZone;
if (daylight) {
mStyle = style | 0x80000000;
} else {
mStyle = style;
}
mLocale = locale;
}
@Override
public int hashCode() {
return (mStyle * 31 + mLocale.hashCode() ) * 31 + mTimeZone.hashCode();
}
@Override
public boolean equals(final Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof TimeZoneDisplayKey) {
final TimeZoneDisplayKey other = (TimeZoneDisplayKey)obj;
return
mTimeZone.equals(other.mTimeZone) &&
mStyle == other.mStyle &&
mLocale.equals(other.mLocale);
}
return false;
}
}
}