GenericGFPoly - Javadocs [I2P+ 0.9.50]

java.lang.Object

com.google.zxing.common.reedsolomon.GenericGFPoly

final class GenericGFPoly
extends Object

Represents a polynomial whose coefficients are elements of a GF. Instances of this class are immutable.

Much credit is due to William Rucklidge since portions of this code are an indirect port of his C++ Reed-Solomon implementation.

Author:: Sean Owen

Constructor Summary

Constructors

Constructor Description

GenericGFPoly(GenericGF field, int[] coefficients)

Method Summary

Modifier and Type	Method	Description
`(package private) GenericGFPoly`	`addOrSubtract(GenericGFPoly other)`
`(package private) GenericGFPoly[]`	`divide(GenericGFPoly other)`
`(package private) int`	`evaluateAt(int a)`
`(package private) int`	`getCoefficient(int degree)`
`(package private) int[]`	`getCoefficients()`
`(package private) int`	`getDegree()`
`(package private) boolean`	`isZero()`
`(package private) GenericGFPoly`	`multiply(int scalar)`
`(package private) GenericGFPoly`	`multiply(GenericGFPoly other)`
`(package private) GenericGFPoly`	`multiplyByMonomial(int degree, int coefficient)`
`String`	`toString()`

Methods inherited from class java.lang.Object

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

Constructor Details
- GenericGFPoly
  
  GenericGFPoly(GenericGF field, int[] coefficients)
  
  Parameters:
  
  field - the GenericGF instance representing the field to use to perform computations
  
  coefficients - coefficients as ints representing elements of GF(size), arranged from most significant (highest-power term) coefficient to least significant
  
  Throws:
  
  IllegalArgumentException - if argument is null or empty, or if leading coefficient is 0 and this is not a constant polynomial (that is, it is not the monomial "0")
Method Details
- getCoefficients
  
  int[] getCoefficients()
- getDegree
  
  int getDegree()
  
  Returns:
  
  degree of this polynomial
- isZero
  
  boolean isZero()
  
  Returns:
  
  true iff this polynomial is the monomial "0"
- getCoefficient
  
  int getCoefficient(int degree)
  
  Returns:
  
  coefficient of x^degree term in this polynomial
- evaluateAt
  
  int evaluateAt(int a)
  
  Returns:
  
  evaluation of this polynomial at a given point
- addOrSubtract
  
  GenericGFPoly addOrSubtract(GenericGFPoly other)
- multiply
  
  GenericGFPoly multiply(GenericGFPoly other)
- multiply
  
  GenericGFPoly multiply(int scalar)
- multiplyByMonomial
  
  GenericGFPoly multiplyByMonomial(int degree, int coefficient)
- divide
  
  GenericGFPoly[] divide(GenericGFPoly other)
- toString
  
  public String toString()
  
  Overrides:
  
  toString in class Object