org.planx.msd.character
Class SizeCharSequenceDiscriminator<T extends CharSequence>

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

All Implemented Interfaces:

Discriminator<T>

public class SizeCharSequenceDiscriminator<T extends CharSequence>
extends AbstractDiscriminator<T>

A Discriminator capable of discriminating a multiset of CharSequence objects (e.g Strings). This implementation performs an initial partitioning on the lengths of the CharSequences. Unless the size of the CharSequences differ very much, this implementation will be slower than the standard CharSequenceDiscriminator.

Note that this implementation is not synchronized. If multiple threads access an instance of this class concurrently, it must be synchronized externally.

Author:

Thomas Ambus

Constructor Summary

SizeCharSequenceDiscriminator(Memory memory)
Constructs a new CharSequenceDiscriminator reusing the memory allocated in the specified Memory.

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

SizeCharSequenceDiscriminator

public SizeCharSequenceDiscriminator(Memory memory)

Constructs a new CharSequenceDiscriminator reusing the memory allocated in the specified Memory.

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 extends CharSequence>

Specified by:

discriminate in class AbstractDiscriminator<T extends CharSequence>