org.jfree.formula.typing

Interface TypeRegistry

Known Implementing Classes:
DefaultTypeRegistry

public interface TypeRegistry

The type registry manages the known value types.
Author:
Thomas Morgner

Method Summary

TypeValuePair
convertTo(Type targetType, TypeValuePair valuePair)
Checks, whether the target type would accept the specified value object and value type.
Date
convertToDate(Type type1, Object value)
Converts the object of the given type into a date.
Boolean
convertToLogical(Type type1, Object value)
Converts the object of the given type into a boolean.
Number
convertToNumber(Type type1, Object value)
Converts the object of the given type into a number.
String
convertToText(Type type1, Object value)
(This conversion is used by the operator implementations.)
ExtendedComparator
getComparator(Type type1, Type type2)
Returns an comparator for the given types.
Type
guessTypeOfObject(Object o)

Method Details

convertTo

public TypeValuePair convertTo(Type targetType,
                               TypeValuePair valuePair)
            throws TypeConversionException
Checks, whether the target type would accept the specified value object and value type. (This conversion is used by the functions.)
Parameters:
targetType -
valuePair -

convertToDate

public Date convertToDate(Type type1,
                          Object value)
            throws TypeConversionException
Converts the object of the given type into a date.
Parameters:
type1 -
value -
Returns:
The value as Date or null.

convertToLogical

public Boolean convertToLogical(Type type1,
                                Object value)
            throws TypeConversionException
Converts the object of the given type into a boolean.
Parameters:
type1 -
value -
Returns:
The value as Boolean or null.

convertToNumber

public Number convertToNumber(Type type1,
                              Object value)
            throws TypeConversionException
Converts the object of the given type into a number. If the object is not convertible, a NumberFormatException is thrown. (This conversion is used by the operator implementations.)
Parameters:
type1 -
value -
Returns:
the value as number or ZERO if the value is unconvertible.
Throws:
TypeConversionException - if the type cannot be represented as number.

convertToText

public String convertToText(Type type1,
                            Object value)
            throws TypeConversionException
(This conversion is used by the operator implementations.)
Parameters:
type1 -
value -
Returns:
the value as string or an empty string, if the value given is null.

getComparator

public ExtendedComparator getComparator(Type type1,
                                        Type type2)
Returns an comparator for the given types.
Parameters:
type1 -
type2 -
Returns:

guessTypeOfObject

public Type guessTypeOfObject(Object o)