com.sigio.util

Class ValueTransformer<T>

java.lang.Object

com.sigio.util.ValueTransformer<T>

Direct Known Subclasses:

FahrenheitToCentigradeValueTransformer, InchToMillimeterValueTransformer, YardToMeterValueTransformer

public abstract class ValueTransformer<T>
extends java.lang.Object

Abstract class to provide a base for other value transformer implementations.

A value transformer is an object that takes an instance of some object and returns a new object of the same class with the input object's value transformed in some way from the original. An example of this might be a class to convert temperatures from Fahrenheit to Centigrade.

Constructor Summary

Constructors

Constructor and Description
ValueTransformer()

Method Summary

Modifier and Type	Method and Description
boolean	allowsReverseTransformation() Returns true if the instance can do a reverse transformation.
T	reverseTransformValue(T o) Performs a reverse transformation.
abstract T	transformValue(T o) Transforms an object's value.

Methods inherited from class java.lang.Object

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

Constructor Detail

ValueTransformer

public ValueTransformer()

Method Detail

allowsReverseTransformation

public boolean allowsReverseTransformation()

Returns true if the instance can do a reverse transformation. The inherited implementation always returns false.

Returns:

true if a reverse transformation is supported; false if it is not

reverseTransformValue

public T reverseTransformValue(T o)

Performs a reverse transformation. The inherited implementation always throws an UnsupportedOperationException unless the child class overrides allowsReverseTransformation to return true. If such a child does not also override reverseTransformValue, the default performs transformValue.

Parameters:

o - the instance object to reverse transform

Returns:

new object with the transformed value

Throws:

java.lang.UnsupportedOperationException - when a reverse transformation is not supported

transformValue

public abstract T transformValue(T o)

Transforms an object's value.

Parameters:

o - object whose value is to be transformed

Returns:

new object with the transformed value