Package com.singularsys.extensions.field.implementations

Class BigIntegerToRationalDecorator

java.lang.Object

com.singularsys.extensions.field.implementations.FieldDecorator

com.singularsys.extensions.field.implementations.BigIntegerToRationalDecorator

All Implemented Interfaces:

FieldI, java.io.Serializable

public class BigIntegerToRationalDecorator
extends FieldDecorator

Converts BigIntegers, Long, Integer and Short to Rationals on input. Optionally on output if the rational number represents an integer then convert it back to a BigInteger.

This should be use to wrap an RationalField. Problems will occur if combined with an IntegerField as the IntegerField will convert a fraction like "5/2" into integer division giving a result of the integer 2. Instead to mix Rationals and BigIntegers use

     RationalField rf = new RationalField();
     BigIntegerToRationalDecorator ird = new BigIntegerToRationalDecorator(rf,true);
     FieldOperatorTable fot = new FieldOperatorTable(ird);
     BigIntegerNumberFactory inf = new BigIntegerNumberFactory();
     Jep jep = new Jep(fot,inf);
 

which performing all calculations in rationals and converts results to BigInteger if possible.

To mix Integers and Rationals use

     RationalField rf = new RationalField();
     BigIntegerToRationalDecorator ird = new BigIntegerToRationalDecorator(rf,true);
     IntegerToBigIntegerDecorator ibid = new IntegerToBigIntegerDecorator(ird,true);
     FieldOperatorTable fot = new FieldOperatorTable(ibid);
     IntegerNumberFactory inf = new IntegerNumberFactory();
     Jep jep = new Jep(fot,inf);
 

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
BigIntegerToRationalDecorator(FieldI field)
BigIntegerToRationalDecorator(FieldI field, boolean simplifyResults)

Method Summary

Modifier and Type	Method	Description
java.lang.Object	convertInput(java.lang.Object in)	Converts BigInteger, Integer, Long and Short to Rational.
java.lang.Object	convertOutput(java.lang.Object out)	If possible convert Rationals to BigIntegers.

Methods inherited from class com.singularsys.extensions.field.implementations.FieldDecorator

add, and, div, eq, ge, getOne, getZero, gt, le, lt, mod, mul, ne, neg, not, or, pow, sub

Methods inherited from class java.lang.Object

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

Constructor Detail

BigIntegerToRationalDecorator

public BigIntegerToRationalDecorator(FieldI field)

BigIntegerToRationalDecorator

public BigIntegerToRationalDecorator(FieldI field,
                                     boolean simplifyResults)

Method Detail

convertInput

public java.lang.Object convertInput(java.lang.Object in)
                              throws EvaluationException

Converts BigInteger, Integer, Long and Short to Rational.

Specified by:

convertInput in class FieldDecorator

Returns:

If appropriate convert in to a different type, otherwise return in.

Throws:

EvaluationException

convertOutput

public java.lang.Object convertOutput(java.lang.Object out)
                               throws EvaluationException

If possible convert Rationals to BigIntegers.

Specified by:

convertOutput in class FieldDecorator

Returns:

If appropriate convert out to a different type, otherwise return out.

Throws:

EvaluationException