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## org.apache.commons.math.util
Class TransformerMap

    java.lang.Object
      org.apache.commons.math.util.TransformerMap

All Implemented Interfaces:
  Serializable, NumberTransformer

    public class TransformerMap

extends Object
implements NumberTransformer, 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.

Version:
  $Revision: 922713 $ $Date: 2010-03-14 02:26:13 +0100 (dim. 14 mars 2010) $
See Also:
  Serialized Form

Field Summary
`private NumberTransformer` | `defaultTransformer` A default Number Transformer for Numbers and numeric Strings.
`private Map<Class<?>,NumberTransformer>` | `map` The internal Map.
`private static long` | `serialVersionUID` Serializable version identifier

Constructor Summary
`TransformerMap()` Build a map containing only the default transformer.

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

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### serialVersionUID

    private static final long serialVersionUID

  Serializable version identifier

  See Also:
    Constant Field Values

### defaultTransformer

    private NumberTransformer defaultTransformer

  A default Number Transformer for Numbers and numeric Strings.

### map

    private Map<Class<?>,NumberTransformer> map

  The internal Map.

Constructor Detail

### TransformerMap

    public TransformerMap()

  Build a map containing only the default transformer.

Method Detail

### containsClass

    public boolean containsClass(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(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(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(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 Set<Class<?>> classes()

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

  Returns:
    Set of Classes

### transformers

    public Collection<NumberTransformer> transformers()

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

  Returns:
    Set of NumberTransformers

### transform

    public double transform(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(Object other)

  Overrides:
    `equals` in class `Object`

### hashCode

    public int hashCode()

  Overrides:
    `hashCode` in class `Object`

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