Dates.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime.util;
 
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.annotations.SimpleObject;
 
import java.util.Date;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
 
@SimpleObject
public final class Dates {
 
  public static final int DATE_YEAR = Calendar.YEAR;
  public static final int DATE_MONTH = Calendar.MONTH;
  public static final int DATE_DAY = Calendar.DATE;
  public static final int DATE_WEEK = Calendar.WEEK_OF_YEAR;
  public static final int DATE_HOUR = Calendar.HOUR_OF_DAY;
  public static final int DATE_MINUTE = Calendar.MINUTE;
  public static final int DATE_SECOND = Calendar.SECOND;
  public static final int DATE_MILLISECOND = Calendar.MILLISECOND;
 
  public static final int DATE_MONDAY = Calendar.MONDAY;
  public static final int DATE_TUESDAY = Calendar.TUESDAY;
  public static final int DATE_WEDNESDAY = Calendar.WEDNESDAY;
  public static final int DATE_THURSDAY = Calendar.THURSDAY;
  public static final int DATE_FRIDAY = Calendar.FRIDAY;
  public static final int DATE_SATURDAY = Calendar.SATURDAY;
  public static final int DATE_SUNDAY = Calendar.SUNDAY;
 
  public static final int DATE_JANUARY = Calendar.JANUARY;
  public static final int DATE_FEBRUARY = Calendar.FEBRUARY;
  public static final int DATE_MARCH = Calendar.MARCH;
  public static final int DATE_APRIL = Calendar.APRIL;
  public static final int DATE_MAY = Calendar.MAY;
  public static final int DATE_JUNE = Calendar.JUNE;
  public static final int DATE_JULY = Calendar.JULY;
  public static final int DATE_AUGUST = Calendar.AUGUST;
  public static final int DATE_SEPTEMBER = Calendar.SEPTEMBER;
  public static final int DATE_OCTOBER = Calendar.OCTOBER;
  public static final int DATE_NOVEMBER = Calendar.NOVEMBER;
  public static final int DATE_DECEMBER = Calendar.DECEMBER;
 
  private Dates() {  // COV_NF_LINE
  }                  // COV_NF_LINE
 
  @SimpleFunction
  public static void DateAdd(Calendar date, int intervalKind, int interval) {
    switch (intervalKind) {
      default:
        throw new IllegalArgumentException("illegal date/time interval kind in function DateAdd()");
 
      case DATE_YEAR:
      case DATE_MONTH:
      case DATE_DAY:
      case DATE_WEEK:
      case DATE_HOUR:
      case DATE_MINUTE:
      case DATE_SECOND:
        date.add(intervalKind, interval);
        break;
    }
  }
 
  @SimpleFunction
  public static void DateAddInMillis(Calendar date, long millis) {
    long dateInMillis = date.getTimeInMillis();
    date.setTimeInMillis(dateInMillis+millis);
  }
 
  @SimpleFunction
  public static Calendar DateValue(String value) {
    Calendar date = new GregorianCalendar();
    date.setTime(tryParseDate(value));
    return date;
  }
 
  private static Date tryParseDate(String value) {
    String[] formats = {
      "MM/dd/yyyy hh:mm:ss a",
      "MM/dd/yyyy HH:mm:ss",
      "MM/dd/yyyy hh:mm a",
      "MM/dd/yyyy HH:mm",
      "MM/dd/yyyy",
      "hh:mm:ss a",
      "HH:mm:ss",
      "hh:mm a",
      "HH:mm"
    };
    for (String format : formats) {
      try {
        return new SimpleDateFormat(format).parse(value);
      } catch (ParseException e) {}
    }
    throw new IllegalArgumentException("illegal date/time format in function DateValue()");
  }
 
  @SimpleFunction
  public static int Day(Calendar date) {
    return date.get(Calendar.DAY_OF_MONTH);
  }
 
  @SimpleFunction
  public static long ConvertDuration(long duration, int intervalKind) {
            switch (intervalKind) {
              default:
                throw new IllegalArgumentException("illegal date/time interval kind in function Duration()");
              case DATE_WEEK:
                  return duration/1000/60/60/24/7;
              case DATE_DAY:
                  return duration/1000/60/60/24;
              case DATE_HOUR:
                  return duration/1000/60/60;
              case DATE_MINUTE:
                  return duration/1000/60;
              case DATE_SECOND:
                  return duration/1000;
            }
  }
 
  @SimpleFunction
  public static String FormatDateTime(Calendar date, String pattern) {
    SimpleDateFormat formatdate = new SimpleDateFormat();
    if (pattern.length() == 0) {
      formatdate.applyPattern("MMM d, yyyy hh:mm:ss a");
    } else {
      formatdate.applyPattern(pattern);
    }
    return formatdate.format(date.getTime());
  }
 
  @SimpleFunction
  public static String FormatDate(Calendar date, String pattern) {
    SimpleDateFormat formatdate = new SimpleDateFormat();
    if (pattern.length() == 0) {
      formatdate.applyPattern("MMM d, yyyy");
    } else {
      formatdate.applyPattern(pattern);
    }
      return formatdate.format(date.getTime());
  }
 
  @SimpleFunction
  public static String FormatTime(Calendar date) {
    return DateFormat.getTimeInstance(DateFormat.MEDIUM).format(date.getTime());
  }
 
  @SimpleFunction
  public static Calendar DateInstant(int year, int month, int day) {
    String year_str = String.valueOf(year);
    String month_str = String.valueOf(month);
    String day_str = String.valueOf(day);
    String date;
    if (month < 10)
      month_str = "0" + month_str;
    if (day < 10)
      day_str = "0" + day_str;
    date = month_str + "/" + day_str + "/" + year_str;
    return Dates.DateValue(date);
  }
 
  @SimpleFunction
  public static Calendar TimeInstant(int hour, int minute) {
    String hour_str = String.valueOf(hour);
    String minute_str = String.valueOf(minute);
    String time;
    if (hour < 10)
      hour_str = "0" + hour_str;
    if (minute < 10)
      minute_str = "0" + minute_str;
    time = hour_str + ":" + minute_str;
    return Dates.DateValue(time);
  }
 
  @SimpleFunction
  public static int Hour(Calendar date) {
    return date.get(Calendar.HOUR_OF_DAY);
  }
 
  @SimpleFunction
  public static int Minute(Calendar date) {
    return date.get(Calendar.MINUTE);
  }
 
  @SimpleFunction
  public static int Month(Calendar date) {
    return date.get(Calendar.MONTH);
  }
 
  @SimpleFunction
  public static String MonthName(Calendar date) {
    return String.format("%1$tB", date);
  }
 
  @SimpleFunction
  public static Calendar Now() {
    return new GregorianCalendar();
  }
 
  @SimpleFunction
  public static int Second(Calendar date) {
    return date.get(Calendar.SECOND);
  }
 
  @SimpleFunction
  public static long Timer() {
    return System.currentTimeMillis();
  }
 
  @SimpleFunction
  public static int Weekday(Calendar date) {
    return date.get(Calendar.DAY_OF_WEEK);
  }
 
  @SimpleFunction
  public static String WeekdayName(Calendar date) {
    return String.format("%1$tA", date);
  }
 
  @SimpleFunction
  public static int Year(Calendar date) {
    return date.get(Calendar.YEAR);
  }
}