Package org.apache.commons.beanutils.converters

Class DateTimeConverter

java.lang.Object

org.apache.commons.beanutils.converters.AbstractConverter

org.apache.commons.beanutils.converters.DateTimeConverter

All Implemented Interfaces:

Converter

Direct Known Subclasses:

CalendarConverter, DateConverter, SqlDateConverter, SqlTimeConverter, SqlTimestampConverter

public abstract class DateTimeConverter
extends AbstractConverter

Converter implementation that handles conversion to and from date/time objects.

This implementation handles conversion for the following date/time types.

• java.util.Date
• java.util.Calendar
• java.sql.Date
• java.sql.Time
• java.sql.Timestamp

String Conversions (to and from)

This class provides a number of ways in which date/time conversions to/from Strings can be achieved:

• Using the SHORT date format for the default Locale, configure using:
  • setUseLocaleFormat(true)
• Using the SHORT date format for a specified Locale, configure using:
  • setLocale(Locale)
• Using the specified date pattern(s) for the default Locale, configure using:
  • Either setPattern(String) or setPatterns(String[])
• Using the specified date pattern(s) for a specified Locale, configure using:
  • setPattern(String) or setPatterns(String[]) and...
  • setLocale(Locale)
• If none of the above are configured the toDate(String) method is used to convert from String to Date and the Dates's toString() method used to convert from Date to String.

The Time Zone to use with the date format can be specified using the setTimeZone() method.

Since:

1.8.0

Field Summary

Fields

Modifier and Type	Field	Description
private String	displayPatterns
private Locale	locale
private String[]	patterns
private TimeZone	timeZone
private boolean	useLocaleFormat

Constructor Summary

Constructors

Constructor	Description
DateTimeConverter()	Construct a Date/Time Converter that throws a ConversionException if an error occurs.
DateTimeConverter(Object defaultValue)	Construct a Date/Time Converter that returns a default value if an error occurs.

Method Summary

Modifier and Type	Method	Description
protected String	convertToString(Object value)	Convert an input Date/Calendar object into a String.
protected <T> T	convertToType(Class<T> targetType, Object value)	Convert the input object into a Date object of the specified type.
private DateFormat	getFormat(String pattern)	Create a date format for the specified pattern.
protected DateFormat	getFormat(Locale locale, TimeZone timeZone)	Return a DateFormat for the Locale.
Locale	getLocale()	Return the Locale for the Converter (or null if none specified).
String[]	getPatterns()	Return the date format patterns used to convert dates to/from a java.lang.String (or null if none specified).
TimeZone	getTimeZone()	Return the Time Zone to use when converting dates (or null if none specified.
private void	logFormat(String action, DateFormat format)	Log the DateFormat creation.
private Calendar	parse(Class<?> sourceType, Class<?> targetType, String value)	Parse a String date value using the set of patterns.
private Calendar	parse(Class<?> sourceType, Class<?> targetType, String value, DateFormat format)	Parse a String into a Calendar object using the specified DateFormat.
void	setLocale(Locale locale)	Set the Locale for the Converter.
void	setPattern(String pattern)	Set a date format pattern to use to convert dates to/from a java.lang.String.
void	setPatterns(String[] patterns)	Set the date format patterns to use to convert dates to/from a java.lang.String.
void	setTimeZone(TimeZone timeZone)	Set the Time Zone to use when converting dates.
void	setUseLocaleFormat(boolean useLocaleFormat)	Indicate whether conversion should use a format/pattern or not.
private <T> T	toDate(Class<T> type, long value)	Convert a long value to the specified Date type for this Converter.
private <T> T	toDate(Class<T> type, String value)	Default String to Date conversion.
String	toString()	Provide a String representation of this date/time converter.

Methods inherited from class org.apache.commons.beanutils.converters.AbstractConverter

conversionException, convert, convertArray, getDefault, getDefaultType, handleError, handleMissing, isUseDefault, log, setDefaultValue, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

patterns

private String[] patterns

displayPatterns

private String displayPatterns

locale

private Locale locale

timeZone

private TimeZone timeZone

useLocaleFormat

private boolean useLocaleFormat

Constructor Details

DateTimeConverter

public DateTimeConverter()

Construct a Date/Time Converter that throws a ConversionException if an error occurs.

DateTimeConverter

public DateTimeConverter(Object defaultValue)

Construct a Date/Time Converter that returns a default value if an error occurs.

Parameters:

defaultValue - The default value to be returned if the value to be converted is missing or an error occurs converting the value.

Method Details

convertToString

protected String convertToString(Object value)
                          throws Throwable

Convert an input Date/Calendar object into a String.

N.B.If the converter has been configured to with one or more patterns (using setPatterns()), then the first pattern will be used to format the date into a String. Otherwise the default DateFormat for the default locale (and style if configured) will be used.

Overrides:

convertToString in class AbstractConverter

Parameters:

value - The input value to be converted

Returns:

the converted String value.

Throws:

Throwable - if an error occurs converting to a String

convertToType

protected <T> T convertToType(Class<T> targetType,
 Object value)
                       throws Exception

Convert the input object into a Date object of the specified type.

This method handles conversions between the following types:

• java.util.Date
• java.util.Calendar
• java.sql.Date
• java.sql.Time
• java.sql.Timestamp

It also handles conversion from a String to any of the above types.

For String conversion, if the converter has been configured with one or more patterns (using setPatterns()), then the conversion is attempted with each of the specified patterns. Otherwise the default DateFormat for the default locale (and style if configured) will be used.

Specified by:

convertToType in class AbstractConverter

Type Parameters:

T - The desired target type of the conversion.

Parameters:

targetType - Data type to which this value should be converted.

value - The input value to be converted.

Returns:

The converted value.

Throws:

Exception - if conversion cannot be performed successfully

getFormat

protected DateFormat getFormat(Locale locale,
 TimeZone timeZone)

Return a DateFormat for the Locale.

Parameters:

locale - The Locale to create the Format with (may be null)

timeZone - The Time Zone create the Format with (may be null)

Returns:

A Date Format.

getFormat

private DateFormat getFormat(String pattern)

Create a date format for the specified pattern.

Parameters:

pattern - The date pattern

Returns:

The DateFormat

getLocale

public Locale getLocale()

Return the Locale for the Converter (or null if none specified).

Returns:

The locale to use for conversion

getPatterns

public String[] getPatterns()

Return the date format patterns used to convert dates to/from a java.lang.String (or null if none specified).

Returns:

Array of format patterns.

See Also:

• SimpleDateFormat

getTimeZone

public TimeZone getTimeZone()

Return the Time Zone to use when converting dates (or null if none specified.

Returns:

The Time Zone.

logFormat

private void logFormat(String action,
 DateFormat format)

Log the DateFormat creation.

Parameters:

action - The action the format is being used for

format - The Date format

parse

private Calendar parse(Class<?> sourceType,
 Class<?> targetType,
 String value)
                throws Exception

Parse a String date value using the set of patterns.

Parameters:

sourceType - The type of the value being converted

targetType - The type to convert the value to.

value - The String date value.

Returns:

The converted Date object.

Throws:

Exception - if an error occurs parsing the date.

parse

private Calendar parse(Class<?> sourceType,
 Class<?> targetType,
 String value,
 DateFormat format)

Parse a String into a Calendar object using the specified DateFormat.

Parameters:

sourceType - The type of the value being converted

targetType - The type to convert the value to

value - The String date value.

format - The DateFormat to parse the String value.

Returns:

The converted Calendar object.

Throws:

ConversionException - if the String cannot be converted.

setLocale

public void setLocale(Locale locale)

Set the Locale for the Converter.

Parameters:

locale - The Locale.

setPattern

public void setPattern(String pattern)

Set a date format pattern to use to convert dates to/from a java.lang.String.

Parameters:

pattern - The format pattern.

See Also:

• SimpleDateFormat

setPatterns

public void setPatterns(String[] patterns)

Set the date format patterns to use to convert dates to/from a java.lang.String.

Parameters:

patterns - Array of format patterns.

See Also:

• SimpleDateFormat

setTimeZone

public void setTimeZone(TimeZone timeZone)

Set the Time Zone to use when converting dates.

Parameters:

timeZone - The Time Zone.

setUseLocaleFormat

public void setUseLocaleFormat(boolean useLocaleFormat)

Indicate whether conversion should use a format/pattern or not.

Parameters:

useLocaleFormat - true if the format for the locale should be used, otherwise false

toDate

private <T> T toDate(Class<T> type,
 long value)

Convert a long value to the specified Date type for this Converter.

This method handles conversion to the following types:

• java.util.Date
• java.util.Calendar
• java.sql.Date
• java.sql.Time
• java.sql.Timestamp

Type Parameters:

T - The target type

Parameters:

type - The Date type to convert to

value - The long value to convert.

Returns:

The converted date value.

toDate

private <T> T toDate(Class<T> type,
 String value)

Default String to Date conversion.

This method handles conversion from a String to the following types:

• java.sql.Date
• java.sql.Time
• java.sql.Timestamp

N.B. No default String conversion mechanism is provided for java.util.Date and java.util.Calendar type.

Type Parameters:

T - The target type

Parameters:

type - The date type to convert to

value - The String value to convert.

Returns:

The converted Number value.

toString

public String toString()

Provide a String representation of this date/time converter.

Overrides:

toString in class AbstractConverter

Returns:

A String representation of this date/time converter