org.apache.commons.beanutils.converters
Class AbstractArrayConverter

java.lang.Object
  |
  +--org.apache.commons.beanutils.converters.AbstractArrayConverter

All Implemented Interfaces:

Converter

Direct Known Subclasses:

BooleanArrayConverter, ByteArrayConverter, CharacterArrayConverter, DoubleArrayConverter, FloatArrayConverter, IntegerArrayConverter, LongArrayConverter, ShortArrayConverter, StringArrayConverter

public abstract class AbstractArrayConverter

extends java.lang.Object

implements Converter

Convenience base class for converters that translate the String representation of an array into a corresponding array of primitives object. This class encapsulates the functionality required to parse the String into a list of String elements that can later be individually converted to the appropriate primitive type.

The input syntax accepted by the parseElements() method is designed to be compatible with the syntax used to initialize arrays in a Java source program, except that only String literal values are supported. For maximum flexibility, the surrounding '{' and '}' characters are optional, and individual elements may be separated by any combination of whitespace and comma characters.

Since:

1.4

Version:

$Revision: 1.6 $ $Date: 2004/02/28 13:18:34 $

Author:

Craig R. McClanahan

Field Summary

protected java.lang.Object	defaultValue The default value specified to our Constructor, if any.
protected static java.lang.String[]	strings Model object for string arrays.
protected boolean	useDefault Should we return the default value on conversion errors?

Constructor Summary

AbstractArrayConverter()

Method Summary

abstract java.lang.Object	convert(java.lang.Class type, java.lang.Object value) Convert the specified input object into an output object of the specified type.
protected java.util.List	parseElements(java.lang.String svalue) Parse an incoming String of the form similar to an array initializer in the Java language into a List individual Strings for each element, according to the following rules.

Methods inherited from class java.lang.Object

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

Field Detail

defaultValue

protected java.lang.Object defaultValue

The default value specified to our Constructor, if any.

strings

protected static java.lang.String[] strings

Model object for string arrays.

useDefault

protected boolean useDefault

Should we return the default value on conversion errors?

Constructor Detail

AbstractArrayConverter

public AbstractArrayConverter()

Method Detail

convert

public abstract java.lang.Object convert(java.lang.Class type,
                                         java.lang.Object value)

Convert the specified input object into an output object of the specified type. This method must be implemented by a concrete subclass.

Specified by:

convert in interface Converter

Parameters:

type - Data type to which this value should be converted

value - The input value to be converted

Throws:

ConversionException - if conversion cannot be performed successfully

parseElements

protected java.util.List parseElements(java.lang.String svalue)

Parse an incoming String of the form similar to an array initializer in the Java language into a List individual Strings for each element, according to the following rules.

• The string must have matching '{' and '}' delimiters around a comma-delimited list of values.
• Whitespace before and after each element is stripped.
• If an element is itself delimited by matching single or double quotes, the usual rules for interpreting a quoted String apply.

Parameters:

svalue - String value to be parsed

Throws:

ConversionException - if the syntax of svalue is not syntactically valid

java.lang.NullPointerException - if svalue is null