com.ibm.icu.impl.RelativeDateFormat Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of icu4j Show documentation
Show all versions of icu4j Show documentation
International Component for Unicode for Java (ICU4J) is a mature, widely used Java library
providing Unicode and Globalization support
/*
*******************************************************************************
* Copyright (C) 2007-2012, 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.Comparator;
import java.util.Date;
import java.util.MissingResourceException;
import java.util.Set;
import java.util.TreeSet;
import com.ibm.icu.text.DateFormat;
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;
import com.ibm.icu.util.UResourceBundleIterator;
/**
* @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.
*/
public RelativeDateFormat(int timeStyle, int dateStyle, ULocale locale) {
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)
*/
public StringBuffer format(Calendar cal, StringBuffer toAppendTo,
FieldPosition fieldPosition) {
String relativeDayString = null;
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 && (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)
*/
public void parse(String text, Calendar cal, ParsePosition pos) {
throw new UnsupportedOperationException("Relative Date parse is not implemented yet");
}
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 URelativeString fDates[] = null; // array of strings
/**
* Get the string at a specific offset.
* @param day day offset ( -1, 0, 1, etc.. )
* @return the string, or NULL if none at that location.
*/
private String getStringForDay(int day) {
if(fDates == null) {
loadDates();
}
for(int i=0;i datesSet = new TreeSet(new Comparator() {
public int compare(URelativeString r1, URelativeString r2) {
if(r1.offset == r2.offset) {
return 0;
} else if(r1.offset < r2.offset) {
return -1;
} else {
return 1;
}
}
}) ;
for(UResourceBundleIterator i = rb.getIterator();i.hasNext();) {
UResourceBundle line = i.next();
String k = line.getKey();
String v = line.getString();
URelativeString rs = new URelativeString(k,v);
datesSet.add(rs);
}
fDates = datesSet.toArray(new URelativeString[0]);
}
/**
* @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 = "{1} {0}";
try {
CalendarData calData = new CalendarData(locale, cal.getType());
String[] patterns = calData.getDateTimePatterns();
if (patterns != null && patterns.length >= 9) {
int glueIndex = 8;
if (patterns.length >= 13)
{
switch (fDateStyle)
{
case DateFormat.RELATIVE_FULL:
case DateFormat.FULL:
glueIndex += (DateFormat.FULL + 1);
break;
case DateFormat.RELATIVE_LONG:
case DateFormat.LONG:
glueIndex += (DateFormat.LONG +1);
break;
case DateFormat.RELATIVE_MEDIUM:
case DateFormat.MEDIUM:
glueIndex += (DateFormat.MEDIUM +1);
break;
case DateFormat.RELATIVE_SHORT:
case DateFormat.SHORT:
glueIndex += (DateFormat.SHORT + 1);
break;
default:
break;
}
}
pattern = patterns[glueIndex];
}
} catch (MissingResourceException e) {
// use default
}
fCombinedFormat = new MessageFormat(pattern, locale);
return fCombinedFormat;
}
}