Package edu.jas.poly

Class WordFactory

java.lang.Object

edu.jas.poly.WordFactory

All Implemented Interfaces:

ElemFactory<Word>, MonoidFactory<Word>, java.io.Serializable

public final class WordFactory
extends java.lang.Object
implements MonoidFactory<Word>

WordFactory implements alphabet related methods.

Author:

Heinz Kredel

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WordFactory.WordComparator	Comparator for Words.

Field Summary

Fields

Modifier and Type	Field	Description
Word	ONE	The empty word for this monoid.
java.lang.String[]	translation	The translation array of Strings.
static java.lang.String	transRef	The translation reference string.

Constructor Summary

Constructors

Constructor	Description
WordFactory()	Constructor for WordFactory.
WordFactory(java.lang.String s)	Constructor for WordFactory.
WordFactory(java.lang.String[] S)	Constructor for WordFactory.

Method Summary

Modifier and Type	Method	Description
static java.lang.String	clean(java.lang.String s)	Prepare parse from String.
static java.lang.String[]	cleanAll(java.lang.String[] v)	Prepare parse from String array.
static java.lang.String	cleanSpace(java.lang.String s)	Prepare parse from String.
static java.lang.String	concat(java.lang.String[] v)	Concat variable names.
Word	contract(Word w)	Contract word to this word factory.
Word	copy(Word w)	Copy word.
boolean	equals(java.lang.Object B)	Comparison with any other object.
WordFactory	extend(java.lang.String[] vn)	Extend variables.
Word	fromInteger(long a)	Get the Element for a.
Word	fromInteger(java.math.BigInteger a)	Get the Element for a.
java.util.List<Word>	generators()	Get a list of the generating elements.
WordFactory.WordComparator	getAscendComparator()	Get the ascending order comparator.
WordFactory.WordComparator	getDescendComparator()	Get the descending order comparator.
Word	getONE()	Get the one element, the empty word.
char	getVal(int i)	Get the alphabet letter at position i.
java.lang.String[]	getVars()	Get the variable names.
int	hashCode()	hashCode.
int	indexOf(char s)	IndexOf for letter in alphabet.
static int	indexOf(java.lang.String[] v, java.lang.String s)	IndexOf for String array.
boolean	isAssociative()	Query if this monoid is associative.
boolean	isCommutative()	Query if this monoid is commutative.
boolean	isFinite()	Is this structure finite or infinite.
static boolean	isSingleLetters(java.lang.String[] v)	Test if all variables are single letters.
boolean	isSubFactory(WordFactory w)	Test if the alphabet of w is a subalphabet of this.
int	length()	Get the alphabet length.
Word	parse(java.io.Reader r)	Parse from Reader.
Word	parse(java.lang.String s)	Parse from String.
Word	random(int n)	Generate a random Element with size less equal to n.
Word	random(int n, java.util.Random random)	Generate a random Element with size less equal to n.
java.lang.String	toScript()	Get a scripting compatible string representation.
java.lang.String	toString()	Get the string representation.
java.lang.String	translate(java.lang.String[] v)	Translate variable names.
java.lang.String	transVar(char c)	Translate variable name.
static java.lang.String[]	trimAll(java.lang.String[] v)	Trim all variable names.
Word	valueOf(ExpVector e)	Get the Element for an ExpVector.
Word	valueOf(Word w)	Get the element from an other word.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface edu.jas.structure.ElemFactory

valueOf

Field Detail

ONE

public final Word ONE

The empty word for this monoid.

transRef

public static final java.lang.String transRef

The translation reference string.

See Also:

Constant Field Values

translation

public final java.lang.String[] translation

The translation array of Strings.

Constructor Detail

WordFactory

public WordFactory()

Constructor for WordFactory.

WordFactory

public WordFactory(java.lang.String s)

Constructor for WordFactory.

Parameters:

s - String of single letters for alphabet

WordFactory

public WordFactory(java.lang.String[] S)

Constructor for WordFactory.

Parameters:

S - String array for alphabet

Method Detail

isFinite

public boolean isFinite()

Is this structure finite or infinite.

Specified by:

isFinite in interface ElemFactory<Word>

Returns:

true if this structure is finite, else false.

See Also:

ElemFactory.isFinite()

isCommutative

public boolean isCommutative()

Query if this monoid is commutative.

Specified by:

isCommutative in interface MonoidFactory<Word>

Returns:

true if this monoid is commutative, else false.

isAssociative

public boolean isAssociative()

Query if this monoid is associative.

Specified by:

isAssociative in interface MonoidFactory<Word>

Returns:

true if this monoid is associative, else false.

getONE

public Word getONE()

Get the one element, the empty word.

Specified by:

getONE in interface MonoidFactory<Word>

Returns:

1 as Word.

copy

public Word copy(Word w)

Copy word.

Specified by:

copy in interface ElemFactory<Word>

Parameters:

w - word to copy.

Returns:

copy of w.

length

public int length()

Get the alphabet length.

Returns:

alphabet.length.

getVal

public char getVal(int i)

Get the alphabet letter at position i.

Parameters:

i - position.

Returns:

val[i].

getVars

public java.lang.String[] getVars()

Get the variable names.

Returns:

array of variable names

extend

public WordFactory extend(java.lang.String[] vn)

Extend variables. Extend number of variables by length(vn).

Parameters:

vn - names for extended variables.

Returns:

extended word ring factory.

toString

public java.lang.String toString()

Get the string representation.

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()

toScript

public java.lang.String toScript()

Get a scripting compatible string representation.

Specified by:

toScript in interface ElemFactory<Word>

Returns:

script compatible representation for this Element.

See Also:

Element.toScript()

equals

public boolean equals(java.lang.Object B)

Comparison with any other object.

Overrides:

equals in class java.lang.Object

See Also:

Object.equals(java.lang.Object)

hashCode

public int hashCode()

hashCode.

Overrides:

hashCode in class java.lang.Object

See Also:

Object.hashCode()

generators

public java.util.List<Word> generators()

Get a list of the generating elements.

Specified by:

generators in interface ElemFactory<Word>

Returns:

list of generators for the algebraic structure.

fromInteger

public Word fromInteger(long a)

Get the Element for a.

Specified by:

fromInteger in interface ElemFactory<Word>

Parameters:

a - long

Returns:

element corresponding to a.

fromInteger

public Word fromInteger(java.math.BigInteger a)

Get the Element for a.

Specified by:

fromInteger in interface ElemFactory<Word>

Parameters:

a - java.math.BigInteger.

Returns:

element corresponding to a.

valueOf

public Word valueOf(ExpVector e)

Get the Element for an ExpVector.

Parameters:

e - ExpVector.

Returns:

element corresponding to e.

valueOf

public Word valueOf(Word w)

Get the element from an other word.

Parameters:

w - other word.

Returns:

w in this word factory.

indexOf

public int indexOf(char s)

IndexOf for letter in alphabet.

Parameters:

s - letter character.

Returns:

index of s in the alphabet, or -1 if s is not contained in the alphabet.

random

public Word random(int n)

Generate a random Element with size less equal to n.

Specified by:

random in interface ElemFactory<Word>

Parameters:

n -

Returns:

a random element.

random

public Word random(int n,
                   java.util.Random random)

Generate a random Element with size less equal to n.

Specified by:

random in interface ElemFactory<Word>

Parameters:

n -

random - is a source for random bits.

Returns:

a random element.

parse

public Word parse(java.lang.String s)

Parse from String.

Specified by:

parse in interface ElemFactory<Word>

Parameters:

s - String.

Returns:

a Element corresponding to s.

parse

public Word parse(java.io.Reader r)

Parse from Reader. White space is delimiter for word.

Specified by:

parse in interface ElemFactory<Word>

Parameters:

r - Reader.

Returns:

the next Element found on r.

isSubFactory

public boolean isSubFactory(WordFactory w)

Test if the alphabet of w is a subalphabet of this.

Parameters:

w - other word factory to test.

Returns:

true, if w is a subalphabet of this, else false.

contract

public Word contract(Word w)

Contract word to this word factory. this.isSubFactory(w.mono) must be true, otherwise null is returned.

Parameters:

w - other word to contract.

Returns:

w with this factory, or null if not contractable.

getDescendComparator

public WordFactory.WordComparator getDescendComparator()

Get the descending order comparator. Sorts the highest terms first.

Returns:

horder.

getAscendComparator

public WordFactory.WordComparator getAscendComparator()

Get the ascending order comparator. Sorts the lowest terms first.

Returns:

lorder.

cleanSpace

public static java.lang.String cleanSpace(java.lang.String s)

Prepare parse from String.

Parameters:

s - String.

Returns:

a Element corresponding to s.

clean

public static java.lang.String clean(java.lang.String s)

Prepare parse from String.

Parameters:

s - String.

Returns:

a Element corresponding to s.

cleanAll

public static java.lang.String[] cleanAll(java.lang.String[] v)

Prepare parse from String array.

Parameters:

v - String array.

Returns:

an array of cleaned strings.

concat

public static java.lang.String concat(java.lang.String[] v)

Concat variable names.

Parameters:

v - an array of strings.

Returns:

the concatination of the strings in v.

trimAll

public static java.lang.String[] trimAll(java.lang.String[] v)

Trim all variable names.

Parameters:

v - an array of strings.

Returns:

an array of strings with all elements trimmed.

indexOf

public static int indexOf(java.lang.String[] v,
                          java.lang.String s)

IndexOf for String array.

Parameters:

v - an array of strings.

s - string.

Returns:

index of s in v, or -1 if s is not contained in v.

isSingleLetters

public static boolean isSingleLetters(java.lang.String[] v)

Test if all variables are single letters.

Parameters:

v - an array of strings.

Returns:

true, if all variables have length 1, else false.

translate

public java.lang.String translate(java.lang.String[] v)

Translate variable names.

Parameters:

v - an array of strings.

Returns:

the translated string of v with respect to t.

transVar

public java.lang.String transVar(char c)

Translate variable name.

Parameters:

c - internal char.

Returns:

the extenal translated string.