org.planx.msd.util
Class CacheDiscriminator<T>

java.lang.Object
  org.planx.msd.util.AbstractDiscriminator<T>
      org.planx.msd.util.CacheDiscriminator<T>

All Implemented Interfaces:

Discriminator<T>

public class CacheDiscriminator<T>
extends AbstractDiscriminator<T>

A CacheDiscriminator is used to break long chains of Extractors in complex discriminators. This is done by simply extracting the values and caching them.

Author:

Thomas Ambus

Constructor Summary

CacheDiscriminator(Discriminator<T> d)

Method Summary

<U,S> Collection<List<S>>

discriminate(List<? extends U> values, Extractor<U,? extends T,S> e) Discriminates a List of values using an Extractor, and returns a Collection of Lists, each representing an equivalence class containing elements from values that are equivalent.

Methods inherited from class org.planx.msd.util.AbstractDiscriminator

discriminate

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheDiscriminator

public CacheDiscriminator(Discriminator<T> d)

Method Detail

discriminate

public <U,S> Collection<List<S>> discriminate(List<? extends U> values,
                                              Extractor<U,? extends T,S> e)

Description copied from interface: Discriminator

Discriminates a List of values using an Extractor, and returns a Collection of Lists, each representing an equivalence class containing elements from values that are equivalent. The Extractor performs the task of extracting two kinds of objects from the input values: The label which is the object equivalence is defined upon, and the value which is the object that will be returned. That is, the label determines which equivalence class the value goes into.

The Collection of Lists returned should be considered unmodifiable (though, in some cases they might actually be modifiable, but this behaviour should not be relied upon).

Specified by:

discriminate in interface Discriminator<T>

Specified by:

discriminate in class AbstractDiscriminator<T>