net.sf.jagg.msd
Class PropertiesDiscriminator<T>

java.lang.Object
  net.sf.jagg.msd.AbstractDiscriminator<T>
      net.sf.jagg.msd.ChainedDiscriminator<T>
          net.sf.jagg.msd.PropertiesDiscriminator<T>

All Implemented Interfaces:

Discriminator<T>

public class PropertiesDiscriminator<T>
extends ChainedDiscriminator<T>

A PropertiesDiscriminator discriminates Lists of Objects by their properties.

Since:

0.5.0

Author:

Randy Gettman

Nested Class Summary

protected class

PropertiesDiscriminator.MethodCallChainedExtractor<E,L,B> An MethodCallChainedExtractor extracts results of a method call as labels.

Constructor Summary

PropertiesDiscriminator(java.util.List<java.lang.String> properties)
Creates a PropertiesDiscriminator that discriminates on the given properties of a list of elements.

PropertiesDiscriminator(java.lang.String... properties)
Creates a PropertiesDiscriminator that discriminates on the given properties of a list of elements.

Method Summary

protected <E> ChainedExtractor<E,?,T>	getChainedExtractor(java.util.List<E> elements, Extractor<E,T> extractor) Returns an appropriate ChainedExtractor.
protected <E> Discriminator<?>	getDiscriminator(java.util.List<E> elements, ChainedExtractor<E,?,T> extractor, int index) Returns the Discriminator that discriminates on a specific property, indexed by the given index.

Methods inherited from class net.sf.jagg.msd.ChainedDiscriminator

discriminate

Methods inherited from class net.sf.jagg.msd.AbstractDiscriminator

discriminate

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertiesDiscriminator

public PropertiesDiscriminator(java.lang.String... properties)

Creates a PropertiesDiscriminator that discriminates on the given properties of a list of elements.

Parameters:

properties - An array of properties on which to discriminate.

PropertiesDiscriminator

public PropertiesDiscriminator(java.util.List<java.lang.String> properties)

Creates a PropertiesDiscriminator that discriminates on the given properties of a list of elements.

Parameters:

properties - A List of properties on which to discriminate.

Method Detail

getChainedExtractor

protected <E> ChainedExtractor<E,?,T> getChainedExtractor(java.util.List<E> elements,
                                                          Extractor<E,T> extractor)

Returns an appropriate ChainedExtractor.

Specified by:

getChainedExtractor in class ChainedDiscriminator<T>

Type Parameters:

E - The type of element.

Parameters:

extractor - A ChainedExtractor that returns appropriate labels.

elements - The List of elements.

Returns:

An appropriate ChainedExtractor.

See Also:

ChainedDiscriminator.getDiscriminator(java.util.List, net.sf.jagg.msd.ChainedExtractor, int)

getDiscriminator

protected <E> Discriminator<?> getDiscriminator(java.util.List<E> elements,
                                                ChainedExtractor<E,?,T> extractor,
                                                int index)

Returns the Discriminator that discriminates on a specific property, indexed by the given index. If it is known that no more loops are necessary, then the returned Discriminator may be null.

Specified by:

getDiscriminator in class ChainedDiscriminator<T>

Parameters:

elements - The list of elements.

extractor - The ChainedExtractor that was obtained from getChainedExtractor.

index - The index of the loop.

Returns:

A Discriminator that discriminates on a specific property's type.

See Also:

ChainedDiscriminator.getChainedExtractor(java.util.List, net.sf.jagg.msd.Extractor)