/*
*******************************************************************************
* Copyright (C) 2007-2008, 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.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 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
* @param dateStyle
* @param locale
*/
public RelativeDateFormat(int timeStyle, int dateStyle, ULocale locale) {
fLocale = locale;
fTimeStyle = timeStyle;
fDateStyle = dateStyle;
if(fDateStyle != DateFormat.NONE) {
int newStyle = fDateStyle & ~DateFormat.RELATIVE;
fDateFormat = DateFormat.getDateInstance(newStyle, locale);
} else {
fDateFormat = null;
}
if(fTimeStyle != DateFormat.NONE) {
int newStyle = fTimeStyle & ~DateFormat.RELATIVE;
fTimeFormat = DateFormat.getTimeInstance(newStyle, locale);
} else {
fTimeFormat = null;
}
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) {
//TODO: handle FieldPosition properly
String dayString = null;
String timeString = null;
if (fDateStyle != DateFormat.NONE) {
// calculate the difference, in days, between 'cal' and now.
int dayDiff = dayDifference(cal);
// look up string
dayString = getStringForDay(dayDiff);
if (dayString == null) {
// didn't find it. Fall through to the fDateFormat
dayString = fDateFormat.format(cal);
}
}
if (fTimeStyle != DateFormat.NONE) {
timeString = fTimeFormat.format(cal);
}
if (dayString != null && timeString != null) {
return fCombinedFormat.format(new Object[] {dayString, timeString}, toAppendTo,
new FieldPosition(0));
} else if (dayString != null) {
toAppendTo.append(dayString);
} else if (timeString != null) {
toAppendTo.append(timeString);
}
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; // the held date format
private DateFormat fTimeFormat; // the held time format
private MessageFormat fCombinedFormat; // the {0} {1} format.
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<fDates.length;i++) {
if(fDates[i].offset == day) {
return fDates[i].string;
}
}
return null;
}
/**
* Load the Date string array
*/
private synchronized void loadDates() {
CalendarData calData = new CalendarData(fLocale, calendar.getType());
UResourceBundle rb = calData.get("fields", "day", "relative");
Set datesSet =new TreeSet(new Comparator() {
public int compare(Object o1, Object o2) {
URelativeString r1 = (URelativeString)o1;
URelativeString r2 = (URelativeString)o2;
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 = new URelativeString[0];
fDates = (URelativeString[])datesSet.toArray(fDates);
}
/**
* @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.get("DateTimePatterns").getStringArray();
if (patterns != null && patterns.length >= 9) {
pattern = patterns[8];
}
} catch (MissingResourceException e) {
// use default
}
fCombinedFormat = new MessageFormat(pattern, locale);
return fCombinedFormat;
}
}