org.apache.commons.beanutils.converters
Class NumberConverter

java.lang.Object
  extended by org.apache.commons.beanutils.converters.AbstractConverter
      extended by org.apache.commons.beanutils.converters.NumberConverter
All Implemented Interfaces:
Converter
Direct Known Subclasses:
BigDecimalConverter, BigIntegerConverter, ByteConverter, DoubleConverter, FloatConverter, IntegerConverter, LongConverter, ShortConverter

public abstract class NumberConverter
extends AbstractConverter

Converter implementaion that handles conversion to and from java.lang.Number objects.

This implementation handles conversion for the following java.lang.Number types.

String Conversions (to and from)

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

N.B.Patterns can only be specified used the standard pattern characters and NOT in localized form (see java.text.SimpleDateFormat). For example to cater for number styles used in Germany such as 0.000,00 the pattern is specified in the normal form 0,000.00 and the locale set to Locale.GERMANY.

Since:
1.8.0
Version:
$Revision: 745081 $ $Date: 2009-02-17 14:05:20 +0000 (Tue, 17 Feb 2009) $

Constructor Summary
NumberConverter(boolean allowDecimals)
          Construct a java.lang.Number Converter that throws a ConversionException if a error occurs.
NumberConverter(boolean allowDecimals, Object defaultValue)
          Construct a java.lang.Number Converter that returns a default value if an error occurs.
 
Method Summary
protected  String convertToString(Object value)
          Convert an input Number object into a String.
protected  Object convertToType(Class targetType, Object value)
          Convert the input object into a Number object of the specified type.
 Locale getLocale()
          Return the Locale for the Converter (or null if none specified).
 String getPattern()
          Return the number format pattern used to convert Numbers to/from a java.lang.String (or null if none specified).
 boolean isAllowDecimals()
          Return whether decimals are allowed in the number.
 void setLocale(Locale locale)
          Set the Locale for the Converter.
 void setPattern(String pattern)
          Set a number format pattern to use to convert Numbers to/from a java.lang.String.
 void setUseLocaleFormat(boolean useLocaleFormat)
          Set whether a format should be used to convert the Number.
 String toString()
          Provide a String representation of this number converter.
 
Methods inherited from class org.apache.commons.beanutils.converters.AbstractConverter
convert, convertArray, getDefault, getDefaultType, handleError, handleMissing, isUseDefault, setDefaultValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

NumberConverter

public NumberConverter(boolean allowDecimals)
Construct a java.lang.Number Converter that throws a ConversionException if a error occurs.

Parameters:
allowDecimals - Indicates whether decimals are allowed

NumberConverter

public NumberConverter(boolean allowDecimals,
                       Object defaultValue)
Construct a java.lang.Number Converter that returns a default value if an error occurs.

Parameters:
allowDecimals - Indicates whether decimals are allowed
defaultValue - The default value to be returned
Method Detail

isAllowDecimals

public boolean isAllowDecimals()
Return whether decimals are allowed in the number.

Returns:
Whether decimals are allowed in the number

setUseLocaleFormat

public void setUseLocaleFormat(boolean useLocaleFormat)
Set whether a format should be used to convert the Number.

Parameters:
useLocaleFormat - true if a number format should be used.

getPattern

public String getPattern()
Return the number format pattern used to convert Numbers to/from a java.lang.String (or null if none specified).

See java.text.SimpleDateFormat for details of how to specify the pattern.

Returns:
The format pattern.

setPattern

public void setPattern(String pattern)
Set a number format pattern to use to convert Numbers to/from a java.lang.String.

See java.text.SimpleDateFormat for details of how to specify the pattern.

Parameters:
pattern - The format pattern.

getLocale

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

Returns:
The locale to use for conversion

setLocale

public void setLocale(Locale locale)
Set the Locale for the Converter.

Parameters:
locale - The locale to use for conversion

convertToString

protected String convertToString(Object value)
                          throws Throwable
Convert an input Number object into a String.

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 Object convertToType(Class targetType,
                               Object value)
                        throws Throwable
Convert the input object into a Number object of the specified type.

Specified by:
convertToType in class AbstractConverter
Parameters:
targetType - Data type to which this value should be converted.
value - The input value to be converted.
Returns:
The converted value.
Throws:
Throwable - if an error occurs converting to the specified type

toString

public String toString()
Provide a String representation of this number converter.

Overrides:
toString in class AbstractConverter
Returns:
A String representation of this number converter


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