/*
* Copyright 2001-2011 Stephen Colebourne
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.joda.time.base;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;
import org.joda.time.DateTimeFieldType;
import org.joda.time.DateTimeZone;
import org.joda.time.ReadableDateTime;
import org.joda.time.format.DateTimeFormat;
/**
* AbstractDateTime provides the common behaviour for datetime classes.
* <p>
* This class should generally not be used directly by API users.
* The {@link ReadableDateTime} interface should be used when different
* kinds of date/time objects are to be referenced.
* <p>
* Whenever you want to implement <code>ReadableDateTime</code> you should
* extend this class.
* <p>
* AbstractDateTime subclasses may be mutable and not thread-safe.
*
* @author Brian S O'Neill
* @author Stephen Colebourne
* @since 1.0
*/
public abstract class AbstractDateTime
extends AbstractInstant
implements ReadableDateTime {
/**
* Constructor.
*/
protected AbstractDateTime() {
super();
}
//-----------------------------------------------------------------------
/**
* Get the value of one of the fields of a datetime.
* <p>
* This method uses the chronology of the datetime to obtain the value.
* It is essentially a generic way of calling one of the get methods.
*
* @param type a field type, usually obtained from DateTimeFieldType
* @return the value of that field
* @throws IllegalArgumentException if the field type is null
*/
public int get(DateTimeFieldType type) {
if (type == null) {
throw new IllegalArgumentException("The DateTimeFieldType must not be null");
}
return type.getField(getChronology()).get(getMillis());
}
//-----------------------------------------------------------------------
/**
* Get the era field value.
*
* @return the era
*/
public int getEra() {
return getChronology().era().get(getMillis());
}
/**
* Get the year of era field value.
*
* @return the year of era
*/
public int getCenturyOfEra() {
return getChronology().centuryOfEra().get(getMillis());
}
/**
* Get the year of era field value.
*
* @return the year of era
*/
public int getYearOfEra() {
return getChronology().yearOfEra().get(getMillis());
}
/**
* Get the year of century field value.
*
* @return the year of century
*/
public int getYearOfCentury() {
return getChronology().yearOfCentury().get(getMillis());
}
/**
* Get the year field value.
*
* @return the year
*/
public int getYear() {
return getChronology().year().get(getMillis());
}
/**
* Get the weekyear field value.
* <p>
* The weekyear is the year that matches with the weekOfWeekyear field.
* In the standard ISO8601 week algorithm, the first week of the year
* is that in which at least 4 days are in the year. As a result of this
* definition, day 1 of the first week may be in the previous year.
* The weekyear allows you to query the effective year for that day.
*
* @return the year of a week based year
*/
public int getWeekyear() {
return getChronology().weekyear().get(getMillis());
}
/**
* Get the month of year field value.
*
* @return the month of year
*/
public int getMonthOfYear() {
return getChronology().monthOfYear().get(getMillis());
}
/**
* Get the week of weekyear field value.
* <p>
* This field is associated with the "weekyear" via {@link #getWeekyear()}.
* In the standard ISO8601 week algorithm, the first week of the year
* is that in which at least 4 days are in the year. As a result of this
* definition, day 1 of the first week may be in the previous year.
*
* @return the week of a week based year
*/
public int getWeekOfWeekyear() {
return getChronology().weekOfWeekyear().get(getMillis());
}
/**
* Get the day of year field value.
*
* @return the day of year
*/
public int getDayOfYear() {
return getChronology().dayOfYear().get(getMillis());
}
/**
* Get the day of month field value.
* <p>
* The values for the day of month are defined in {@link org.joda.time.DateTimeConstants}.
*
* @return the day of month
*/
public int getDayOfMonth() {
return getChronology().dayOfMonth().get(getMillis());
}
/**
* Get the day of week field value.
* <p>
* The values for the day of week are defined in {@link org.joda.time.DateTimeConstants}.
*
* @return the day of week
*/
public int getDayOfWeek() {
return getChronology().dayOfWeek().get(getMillis());
}
//-----------------------------------------------------------------------
/**
* Get the hour of day field value.
*
* @return the hour of day
*/
public int getHourOfDay() {
return getChronology().hourOfDay().get(getMillis());
}
/**
* Get the minute of day field value.
*
* @return the minute of day
*/
public int getMinuteOfDay() {
return getChronology().minuteOfDay().get(getMillis());
}
/**
* Get the minute of hour field value.
*
* @return the minute of hour
*/
public int getMinuteOfHour() {
return getChronology().minuteOfHour().get(getMillis());
}
/**
* Get the second of day field value.
*
* @return the second of day
*/
public int getSecondOfDay() {
return getChronology().secondOfDay().get(getMillis());
}
/**
* Get the second of minute field value.
*
* @return the second of minute
*/
public int getSecondOfMinute() {
return getChronology().secondOfMinute().get(getMillis());
}
/**
* Get the millis of day field value.
*
* @return the millis of day
*/
public int getMillisOfDay() {
return getChronology().millisOfDay().get(getMillis());
}
/**
* Get the millis of second field value.
*
* @return the millis of second
*/
public int getMillisOfSecond() {
return getChronology().millisOfSecond().get(getMillis());
}
//-----------------------------------------------------------------------
/**
* Get the date time as a <code>java.util.Calendar</code>, assigning
* exactly the same millisecond instant.
* The locale is passed in, enabling Calendar to select the correct
* localized subclass.
* <p>
* The JDK and Joda-Time both have time zone implementations and these
* differ in accuracy. Joda-Time's implementation is generally more up to
* date and thus more accurate - for example JDK1.3 has no historical data.
* The effect of this is that the field values of the <code>Calendar</code>
* may differ from those of this object, even though the milliseond value
* is the same. Most of the time this just means that the JDK field values
* are wrong, as our time zone information is more up to date.
*
* @param locale the locale to get the Calendar for, or default if null
* @return a localized Calendar initialised with this datetime
*/
public Calendar toCalendar(Locale locale) {
if (locale == null) {
locale = Locale.getDefault();
}
DateTimeZone zone = getZone();
Calendar cal = Calendar.getInstance(zone.toTimeZone(), locale);
cal.setTime(toDate());
return cal;
}
/**
* Get the date time as a <code>java.util.GregorianCalendar</code>,
* assigning exactly the same millisecond instant.
* <p>
* The JDK and Joda-Time both have time zone implementations and these
* differ in accuracy. Joda-Time's implementation is generally more up to
* date and thus more accurate - for example JDK1.3 has no historical data.
* The effect of this is that the field values of the <code>Calendar</code>
* may differ from those of this object, even though the milliseond value
* is the same. Most of the time this just means that the JDK field values
* are wrong, as our time zone information is more up to date.
*
* @return a GregorianCalendar initialised with this datetime
*/
public GregorianCalendar toGregorianCalendar() {
DateTimeZone zone = getZone();
GregorianCalendar cal = new GregorianCalendar(zone.toTimeZone());
cal.setTime(toDate());
return cal;
}
//-----------------------------------------------------------------------
/**
* Output the instant using the specified format pattern.
*
* @param pattern the pattern specification, null means use <code>toString</code>
* @see org.joda.time.format.DateTimeFormat
*/
public String toString(String pattern) {
if (pattern == null) {
return toString();
}
return DateTimeFormat.forPattern(pattern).print(this);
}
/**
* Output the instant using the specified format pattern.
*
* @param pattern the pattern specification, null means use <code>toString</code>
* @param locale Locale to use, null means default
* @see org.joda.time.format.DateTimeFormat
*/
public String toString(String pattern, Locale locale) throws IllegalArgumentException {
if (pattern == null) {
return toString();
}
return DateTimeFormat.forPattern(pattern).withLocale(locale).print(this);
}
}