org.apache.commons.math.util

Class TransformerMap

java.lang.Object

org.apache.commons.math.util.TransformerMap

All Implemented Interfaces:

java.io.Serializable, NumberTransformer

public class TransformerMap
extends java.lang.Object
implements NumberTransformer, java.io.Serializable

This TansformerMap automates the transformation of mixed object types. It provides a means to set NumberTransformers that will be selected based on the Class of the object handed to the Maps double transform(Object o) method.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TransformerMap() Build a map containing only the default transformer.

Method Summary

Modifier and Type	Method and Description
java.util.Set<java.lang.Class<?>>	classes() Returns the Set of Classes used as keys in the map.
void	clear() Clears all the Class to Transformer mappings.
boolean	containsClass(java.lang.Class<?> key) Tests if a Class is present in the TransformerMap.
boolean	containsTransformer(NumberTransformer value) Tests if a NumberTransformer is present in the TransformerMap.
boolean	equals(java.lang.Object other)
NumberTransformer	getTransformer(java.lang.Class<?> key) Returns the Transformer that is mapped to a class if mapping is not present, this returns null.
int	hashCode()
NumberTransformer	putTransformer(java.lang.Class<?> key, NumberTransformer transformer) Sets a Class to Transformer Mapping in the Map.
NumberTransformer	removeTransformer(java.lang.Class<?> key) Removes a Class to Transformer Mapping in the Map.
double	transform(java.lang.Object o) Attempts to transform the Object against the map of NumberTransformers.
java.util.Collection<NumberTransformer>	transformers() Returns the Set of NumberTransformers used as values in the map.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TransformerMap

public TransformerMap()

Build a map containing only the default transformer.

Method Detail

containsClass

public boolean containsClass(java.lang.Class<?> key)

Tests if a Class is present in the TransformerMap.

Parameters:

key - Class to check

Returns:

true|false

containsTransformer

public boolean containsTransformer(NumberTransformer value)

Tests if a NumberTransformer is present in the TransformerMap.

Parameters:

value - NumberTransformer to check

Returns:

true|false

getTransformer

public NumberTransformer getTransformer(java.lang.Class<?> key)

Returns the Transformer that is mapped to a class if mapping is not present, this returns null.

Parameters:

key - The Class of the object

Returns:

the mapped NumberTransformer or null.

putTransformer

public NumberTransformer putTransformer(java.lang.Class<?> key,
                                        NumberTransformer transformer)

Sets a Class to Transformer Mapping in the Map. If the Class is already present, this overwrites that mapping.

Parameters:

key - The Class

transformer - The NumberTransformer

Returns:

the replaced transformer if one is present

removeTransformer

public NumberTransformer removeTransformer(java.lang.Class<?> key)

Removes a Class to Transformer Mapping in the Map.

Parameters:

key - The Class

Returns:

the removed transformer if one is present or null if none was present.

clear

public void clear()

Clears all the Class to Transformer mappings.

classes

public java.util.Set<java.lang.Class<?>> classes()

Returns the Set of Classes used as keys in the map.

Returns:

Set of Classes

transformers

public java.util.Collection<NumberTransformer> transformers()

Returns the Set of NumberTransformers used as values in the map.

Returns:

Set of NumberTransformers

transform

public double transform(java.lang.Object o)
                 throws MathException

Attempts to transform the Object against the map of NumberTransformers. Otherwise it returns Double.NaN.

Specified by:

transform in interface NumberTransformer

Parameters:

o - the Object to be transformed.

Returns:

the double value of the Object.

Throws:

MathException - if the Object can not be transformed into a Double.

See Also:

NumberTransformer.transform(java.lang.Object)

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object