Package org.apache.velocity.util.introspection

Class TypeConversionHandlerImpl

java.lang.Object

org.apache.velocity.util.introspection.TypeConversionHandlerImpl

All Implemented Interfaces:

TypeConversionHandler

public class TypeConversionHandlerImpl
extends Object
implements TypeConversionHandler

A conversion handler adds admissible conversions between Java types whenever Velocity introspection has to map VTL methods and property accessors to Java methods. This implementation is the default Conversion Handler for Velocity.

Since:

2.0

Version:

$Id: TypeConversionHandlerImpl.java $

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final String	BIG_DECIMAL_CLASS
(package private) static final String	BIG_INTEGER_CLASS
(package private) static final String	BOOLEAN_CLASS
(package private) static final String	BOOLEAN_TYPE
(package private) static final String	BYTE_CLASS
(package private) static final String	BYTE_TYPE
(package private) static Converter<?>	cacheMiss	cache miss converter
(package private) static final String	CHARACTER_CLASS
(package private) static final String	CHARACTER_TYPE
(package private) Map<org.apache.commons.lang3.tuple.Pair<String,String>,Converter<?>>	converterCacheMap	a converters cache map, initialized with the standard narrowing and string parsing conversions.
(package private) static final String	DOUBLE_CLASS
(package private) static final String	DOUBLE_TYPE
(package private) static final String	FLOAT_CLASS
(package private) static final String	FLOAT_TYPE
(package private) static final String	INTEGER_CLASS
(package private) static final String	INTEGER_TYPE
(package private) static final String	LOCALE_CLASS
(package private) static final String	LONG_CLASS
(package private) static final String	LONG_TYPE
(package private) static final String	NUMBER_CLASS
(package private) static final String	SHORT_CLASS
(package private) static final String	SHORT_TYPE
(package private) static Map<org.apache.commons.lang3.tuple.Pair<String,String>,Converter<?>>	standardConverterMap	standard narrowing and string parsing conversions.
(package private) static final String	STRING_CLASS
(package private) static Converter<?>	toString	basic toString converter

Constructor Summary

Constructors

Constructor	Description
TypeConversionHandlerImpl()	Constructor

Method Summary

Modifier and Type	Method	Description
void	addConverter(Type formal, Class<?> actual, Converter<?> converter)	Add the given converter to the handler.
(package private) static boolean	checkBounds(Number n, double min, double max)
Converter<?>	getNeededConverter(Type formal, Class<?> actual)	Returns the appropriate Converter object needed for an explicit conversion Returns null if no conversion is needed.
boolean	isExplicitlyConvertible(Type formal, Class<?> actual, boolean possibleVarArg)	Check to see if the conversion can be done using an explicit conversion

Methods inherited from class java.lang.Object

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

Field Details

standardConverterMap

static Map<org.apache.commons.lang3.tuple.Pair<String,String>,Converter<?>> standardConverterMap

standard narrowing and string parsing conversions.

toString

static Converter<?> toString

basic toString converter

cacheMiss

static Converter<?> cacheMiss

cache miss converter

converterCacheMap

Map<org.apache.commons.lang3.tuple.Pair<String,String>,Converter<?>> converterCacheMap

a converters cache map, initialized with the standard narrowing and string parsing conversions.

BOOLEAN_TYPE

static final String BOOLEAN_TYPE

See Also:

• Constant Field Values

BYTE_TYPE

static final String BYTE_TYPE

See Also:

• Constant Field Values

SHORT_TYPE

static final String SHORT_TYPE

See Also:

• Constant Field Values

INTEGER_TYPE

static final String INTEGER_TYPE

See Also:

• Constant Field Values

LONG_TYPE

static final String LONG_TYPE

See Also:

• Constant Field Values

FLOAT_TYPE

static final String FLOAT_TYPE

See Also:

• Constant Field Values

DOUBLE_TYPE

static final String DOUBLE_TYPE

See Also:

• Constant Field Values

CHARACTER_TYPE

static final String CHARACTER_TYPE

See Also:

• Constant Field Values

BOOLEAN_CLASS

static final String BOOLEAN_CLASS

See Also:

• Constant Field Values

BYTE_CLASS

static final String BYTE_CLASS

See Also:

• Constant Field Values

SHORT_CLASS

static final String SHORT_CLASS

See Also:

• Constant Field Values

INTEGER_CLASS

static final String INTEGER_CLASS

See Also:

• Constant Field Values

LONG_CLASS

static final String LONG_CLASS

See Also:

• Constant Field Values

BIG_INTEGER_CLASS

static final String BIG_INTEGER_CLASS

See Also:

• Constant Field Values

FLOAT_CLASS

static final String FLOAT_CLASS

See Also:

• Constant Field Values

DOUBLE_CLASS

static final String DOUBLE_CLASS

See Also:

• Constant Field Values

BIG_DECIMAL_CLASS

static final String BIG_DECIMAL_CLASS

See Also:

• Constant Field Values

NUMBER_CLASS

static final String NUMBER_CLASS

See Also:

• Constant Field Values

CHARACTER_CLASS

static final String CHARACTER_CLASS

See Also:

• Constant Field Values

STRING_CLASS

static final String STRING_CLASS

See Also:

• Constant Field Values

LOCALE_CLASS

static final String LOCALE_CLASS

See Also:

• Constant Field Values

Constructor Details

TypeConversionHandlerImpl

public TypeConversionHandlerImpl()

Constructor

Method Details

checkBounds

static boolean checkBounds(Number n,
 double min,
 double max)

isExplicitlyConvertible

public boolean isExplicitlyConvertible(Type formal,
 Class<?> actual,
 boolean possibleVarArg)

Check to see if the conversion can be done using an explicit conversion

Specified by:

isExplicitlyConvertible in interface TypeConversionHandler

Parameters:

formal - expected formal type

actual - found argument type

possibleVarArg - whether var arg is possible

Returns:

true if actual class can be explicitely converted to expected formal type

Since:

2.1

getNeededConverter

public Converter<?> getNeededConverter(Type formal,
 Class<?> actual)

Returns the appropriate Converter object needed for an explicit conversion Returns null if no conversion is needed.

Specified by:

getNeededConverter in interface TypeConversionHandler

Parameters:

formal - expected formal type

actual - found argument type

Returns:

null if no conversion is needed, or the appropriate Converter object

Since:

2.1

addConverter

public void addConverter(Type formal,
 Class<?> actual,
 Converter<?> converter)

Add the given converter to the handler.

Specified by:

addConverter in interface TypeConversionHandler

Parameters:

formal - expected formal type

actual - provided argument type

converter - converter

Since:

2.1