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With inspiration from other libraries
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
* Copyright (C) 2007-2016, International Business Machines Corporation and
* others. All Rights Reserved.
*******************************************************************************
*/
package com.ibm.icu.impl;
import java.text.FieldPosition;
import java.text.ParsePosition;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.MissingResourceException;
import com.ibm.icu.lang.UCharacter;
import com.ibm.icu.text.BreakIterator;
import com.ibm.icu.text.DateFormat;
import com.ibm.icu.text.DisplayContext;
import com.ibm.icu.text.MessageFormat;
import com.ibm.icu.text.SimpleDateFormat;
import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.TimeZone;
import com.ibm.icu.util.ULocale;
import com.ibm.icu.util.UResourceBundle;
/**
* @author srl
*/
public class RelativeDateFormat extends DateFormat {
/**
* @author srl
*
*/
public static class URelativeString {
URelativeString(int offset, String string) {
this.offset = offset;
this.string = string;
}
URelativeString(String offset, String string) {
this.offset = Integer.parseInt(offset);
this.string = string;
}
public int offset;
public String string;
}
// copy c'tor?
/**
* @param timeStyle The time style for the date and time.
* @param dateStyle The date style for the date and time.
* @param locale The locale for the date.
* @param cal The calendar to be used
*/
public RelativeDateFormat(int timeStyle, int dateStyle, ULocale locale, Calendar cal) {
calendar = cal;
fLocale = locale;
fTimeStyle = timeStyle;
fDateStyle = dateStyle;
if (fDateStyle != DateFormat.NONE) {
int newStyle = fDateStyle & ~DateFormat.RELATIVE;
DateFormat df = DateFormat.getDateInstance(newStyle, locale);
if (df instanceof SimpleDateFormat) {
fDateTimeFormat = (SimpleDateFormat)df;
} else {
throw new IllegalArgumentException("Can't create SimpleDateFormat for date style");
}
fDatePattern = fDateTimeFormat.toPattern();
if (fTimeStyle != DateFormat.NONE) {
newStyle = fTimeStyle & ~DateFormat.RELATIVE;
df = DateFormat.getTimeInstance(newStyle, locale);
if (df instanceof SimpleDateFormat) {
fTimePattern = ((SimpleDateFormat)df).toPattern();
}
}
} else {
// does not matter whether timeStyle is UDAT_NONE, we need something for fDateTimeFormat
int newStyle = fTimeStyle & ~DateFormat.RELATIVE;
DateFormat df = DateFormat.getTimeInstance(newStyle, locale);
if (df instanceof SimpleDateFormat) {
fDateTimeFormat = (SimpleDateFormat)df;
} else {
throw new IllegalArgumentException("Can't create SimpleDateFormat for time style");
}
fTimePattern = fDateTimeFormat.toPattern();
}
initializeCalendar(null, fLocale);
loadDates();
initializeCombinedFormat(calendar, fLocale);
}
/**
* serial version (generated)
*/
private static final long serialVersionUID = 1131984966440549435L;
/* (non-Javadoc)
* @see com.ibm.icu.text.DateFormat#format(com.ibm.icu.util.Calendar, java.lang.StringBuffer, java.text.FieldPosition)
*/
@Override
public StringBuffer format(Calendar cal, StringBuffer toAppendTo,
FieldPosition fieldPosition) {
String relativeDayString = null;
DisplayContext capitalizationContext = getContext(DisplayContext.Type.CAPITALIZATION);
if (fDateStyle != DateFormat.NONE) {
// calculate the difference, in days, between 'cal' and now.
int dayDiff = dayDifference(cal);
// look up string
relativeDayString = getStringForDay(dayDiff);
}
if (fDateTimeFormat != null) {
if (relativeDayString != null && fDatePattern != null &&
(fTimePattern == null || fCombinedFormat == null || combinedFormatHasDateAtStart) ) {
// capitalize relativeDayString according to context for relative, set formatter no context
if ( relativeDayString.length() > 0 && UCharacter.isLowerCase(relativeDayString.codePointAt(0)) &&
(capitalizationContext == DisplayContext.CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE ||
(capitalizationContext == DisplayContext.CAPITALIZATION_FOR_UI_LIST_OR_MENU && capitalizationOfRelativeUnitsForListOrMenu) ||
(capitalizationContext == DisplayContext.CAPITALIZATION_FOR_STANDALONE && capitalizationOfRelativeUnitsForStandAlone) )) {
if (capitalizationBrkIter == null) {
// should only happen when deserializing, etc.
capitalizationBrkIter = BreakIterator.getSentenceInstance(fLocale);
}
relativeDayString = UCharacter.toTitleCase(fLocale, relativeDayString, capitalizationBrkIter,
UCharacter.TITLECASE_NO_LOWERCASE | UCharacter.TITLECASE_NO_BREAK_ADJUSTMENT);
}
fDateTimeFormat.setContext(DisplayContext.CAPITALIZATION_NONE);
} else {
// set our context for the formatter
fDateTimeFormat.setContext(capitalizationContext);
}
}
if (fDateTimeFormat != null && (fDatePattern != null || fTimePattern != null)) {
// The new way
if (fDatePattern == null) {
// must have fTimePattern
fDateTimeFormat.applyPattern(fTimePattern);
fDateTimeFormat.format(cal, toAppendTo, fieldPosition);
} else if (fTimePattern == null) {
// must have fDatePattern
if (relativeDayString != null) {
toAppendTo.append(relativeDayString);
} else {
fDateTimeFormat.applyPattern(fDatePattern);
fDateTimeFormat.format(cal, toAppendTo, fieldPosition);
}
} else {
String datePattern = fDatePattern; // default;
if (relativeDayString != null) {
// Need to quote the relativeDayString to make it a legal date pattern
datePattern = "'" + relativeDayString.replace("'", "''") + "'";
}
StringBuffer combinedPattern = new StringBuffer("");
fCombinedFormat.format(new Object[] {fTimePattern, datePattern}, combinedPattern, new FieldPosition(0));
fDateTimeFormat.applyPattern(combinedPattern.toString());
fDateTimeFormat.format(cal, toAppendTo, fieldPosition);
}
} else if (fDateFormat != null) {
// A subset of the old way, for serialization compatibility
// (just do the date part)
if (relativeDayString != null) {
toAppendTo.append(relativeDayString);
} else {
fDateFormat.format(cal, toAppendTo, fieldPosition);
}
}
return toAppendTo;
}
/* (non-Javadoc)
* @see com.ibm.icu.text.DateFormat#parse(java.lang.String, com.ibm.icu.util.Calendar, java.text.ParsePosition)
*/
@Override
public void parse(String text, Calendar cal, ParsePosition pos) {
throw new UnsupportedOperationException("Relative Date parse is not implemented yet");
}
/* (non-Javadoc)
* @see com.ibm.icu.text.DateFormat#setContext(com.ibm.icu.text.DisplayContext)
* Here we override the DateFormat implementation in order to
* lazily initialize relevant items
*/
@Override
public void setContext(DisplayContext context) {
super.setContext(context);
if (!capitalizationInfoIsSet &&
(context==DisplayContext.CAPITALIZATION_FOR_UI_LIST_OR_MENU || context==DisplayContext.CAPITALIZATION_FOR_STANDALONE)) {
initCapitalizationContextInfo(fLocale);
capitalizationInfoIsSet = true;
}
if (capitalizationBrkIter == null && (context==DisplayContext.CAPITALIZATION_FOR_BEGINNING_OF_SENTENCE ||
(context==DisplayContext.CAPITALIZATION_FOR_UI_LIST_OR_MENU && capitalizationOfRelativeUnitsForListOrMenu) ||
(context==DisplayContext.CAPITALIZATION_FOR_STANDALONE && capitalizationOfRelativeUnitsForStandAlone) )) {
capitalizationBrkIter = BreakIterator.getSentenceInstance(fLocale);
}
}
private DateFormat fDateFormat; // keep for serialization compatibility
@SuppressWarnings("unused")
private DateFormat fTimeFormat; // now unused, keep for serialization compatibility
private MessageFormat fCombinedFormat; // the {0} {1} format.
private SimpleDateFormat fDateTimeFormat = null; // the held date/time formatter
private String fDatePattern = null;
private String fTimePattern = null;
int fDateStyle;
int fTimeStyle;
ULocale fLocale;
private transient List fDates = null;
private boolean combinedFormatHasDateAtStart = false;
private boolean capitalizationInfoIsSet = false;
private boolean capitalizationOfRelativeUnitsForListOrMenu = false;
private boolean capitalizationOfRelativeUnitsForStandAlone = false;
private transient BreakIterator capitalizationBrkIter = null;
/**
* Get the string at a specific offset.
* @param day day offset ( -1, 0, 1, etc.. ). Does not require sorting by offset.
* @return the string, or NULL if none at that location.
*/
private String getStringForDay(int day) {
if(fDates == null) {
loadDates();
}
for(URelativeString dayItem : fDates) {
if(dayItem.offset == day) {
return dayItem.string;
}
}
return null;
}
// Sink to get "fields/day/relative".
private final class RelDateFmtDataSink extends UResource.Sink {
@Override
public void put(UResource.Key key, UResource.Value value, boolean noFallback) {
if (value.getType() == ICUResourceBundle.ALIAS) {
return;
}
UResource.Table table = value.getTable();
for (int i = 0; table.getKeyAndValue(i, key, value); ++i) {
int keyOffset;
try {
keyOffset = Integer.parseInt(key.toString());
}
catch (NumberFormatException nfe) {
// Flag the error?
return;
}
// Check if already set.
if (getStringForDay(keyOffset) == null) {
URelativeString newDayInfo = new URelativeString(keyOffset, value.getString());
fDates.add(newDayInfo);
}
}
}
}
/**
* Load the Date string array
*/
private synchronized void loadDates() {
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle.getBundleInstance(ICUData.ICU_BASE_NAME, fLocale);
// Use sink mechanism to traverse data structure.
fDates = new ArrayList();
RelDateFmtDataSink sink = new RelDateFmtDataSink();
rb.getAllItemsWithFallback("fields/day/relative", sink);
}
/**
* Set capitalizationOfRelativeUnitsForListOrMenu, capitalizationOfRelativeUnitsForStandAlone
*/
private void initCapitalizationContextInfo(ULocale locale) {
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle.getBundleInstance(ICUData.ICU_BASE_NAME, locale);
try {
ICUResourceBundle rdb = rb.getWithFallback("contextTransforms/relative");
int[] intVector = rdb.getIntVector();
if (intVector.length >= 2) {
capitalizationOfRelativeUnitsForListOrMenu = (intVector[0] != 0);
capitalizationOfRelativeUnitsForStandAlone = (intVector[1] != 0);
}
} catch (MissingResourceException e) {
// use default
}
}
/**
* @return the number of days in "until-now"
*/
private static int dayDifference(Calendar until) {
Calendar nowCal = (Calendar)until.clone();
Date nowDate = new Date(System.currentTimeMillis());
nowCal.clear();
nowCal.setTime(nowDate);
int dayDiff = until.get(Calendar.JULIAN_DAY) - nowCal.get(Calendar.JULIAN_DAY);
return dayDiff;
}
/**
* initializes fCalendar from parameters. Returns fCalendar as a convenience.
* @param zone Zone to be adopted, or NULL for TimeZone::createDefault().
* @param locale Locale of the calendar
* @param status Error code
* @return the newly constructed fCalendar
*/
private Calendar initializeCalendar(TimeZone zone, ULocale locale) {
if (calendar == null) {
if(zone == null) {
calendar = Calendar.getInstance(locale);
} else {
calendar = Calendar.getInstance(zone, locale);
}
}
return calendar;
}
private MessageFormat initializeCombinedFormat(Calendar cal, ULocale locale) {
String pattern;
ICUResourceBundle rb = (ICUResourceBundle) UResourceBundle.getBundleInstance(
ICUData.ICU_BASE_NAME, locale);
String resourcePath = "calendar/" + cal.getType() + "/DateTimePatterns";
ICUResourceBundle patternsRb= rb.findWithFallback(resourcePath);
if (patternsRb == null && !cal.getType().equals("gregorian")) {
// Try again with gregorian, if not already attempted.
patternsRb = rb.findWithFallback("calendar/gregorian/DateTimePatterns");
}
if (patternsRb == null || patternsRb.getSize() < 9) {
// Undefined or too few elements.
pattern = "{1} {0}";
} else {
int glueIndex = 8;
if (patternsRb.getSize() >= 13) {
if (fDateStyle >= DateFormat.FULL && fDateStyle <= DateFormat.SHORT) {
glueIndex += fDateStyle + 1;
} else
if (fDateStyle >= DateFormat.RELATIVE_FULL &&
fDateStyle <= DateFormat.RELATIVE_SHORT) {
glueIndex += fDateStyle + 1 - DateFormat.RELATIVE;
}
}
int elementType = patternsRb.get(glueIndex).getType();
if (elementType == UResourceBundle.ARRAY) {
pattern = patternsRb.get(glueIndex).getString(0);
} else {
pattern = patternsRb.getString(glueIndex);
}
}
combinedFormatHasDateAtStart = pattern.startsWith("{1}");
fCombinedFormat = new MessageFormat(pattern, locale);
return fCombinedFormat;
}
}