edu.jas.ps
Class Coefficients<C extends RingElem<C>>

java.lang.Object
  edu.jas.ps.Coefficients<C>

Type Parameters:

C - ring element type

public abstract class Coefficients<C extends RingElem<C>>
extends java.lang.Object

Abstract class for generating functions for coefficients of power series. Was an interface, now this class handles the caching itself.

Author:

Heinz Kredel

Field Summary

java.util.HashMap<java.lang.Integer,C>

coeffCache Cache for already computed coefficients.

Constructor Summary

Coefficients()
Public no arguments constructor.

Coefficients(java.util.HashMap<java.lang.Integer,C> cache)
Public constructor with pre-filled cache.

Method Summary

protected abstract C	generate(int index) Generate coefficient.
C	get(int index) Get cached coefficient or generate coefficient.

Methods inherited from class java.lang.Object

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

Field Detail

coeffCache

public final java.util.HashMap<java.lang.Integer,C extends RingElem<C>> coeffCache

Cache for already computed coefficients.

Constructor Detail

Coefficients

public Coefficients()

Public no arguments constructor.

Coefficients

public Coefficients(java.util.HashMap<java.lang.Integer,C> cache)

Public constructor with pre-filled cache.

Parameters:

cache - pre-filled coefficient cache.

Method Detail

get

public C get(int index)

Get cached coefficient or generate coefficient.

Parameters:

index - of requested coefficient.

Returns:

coefficient at index.

generate

protected abstract C generate(int index)

Generate coefficient.

Parameters:

index - of requested coefficient.

Returns:

coefficient at index.