org.lsmp.djep.groupJep.GroupJep Maven / Gradle / Ivy
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/* @author rich
* Created on 19-Dec-2003
*/
package org.lsmp.djep.groupJep;
import org.nfunk.jep.*;
import org.nfunk.jep.type.Complex;
import org.lsmp.djep.groupJep.values.*;
/**
* An extension of JEP which allows calculations over arbitary groups,
* such as the integers(exact answers) and rationals.
*
* @author Rich Morris
* Created on 19-Dec-2003
*/
public class GroupJep extends JEP {
protected GroupI group;
/**
* Create a new GroupJep instance with calculations over the given group.
*
* @param group The group to calculate over.
*/
public GroupJep(GroupI group) {
super();
this.group = group;
super.numberFactory = group.getNumberFactory();
opSet = new GOperatorSet(group);
}
private GroupJep() {}
public void addStandardFunctions()
{
// Certinally don't want the jep standard functions
// super.addStandardFunctions();
group.addStandardFunctions(this);
}
public void addStandardConstants()
{
group.addStandardConstants(this);
}
public GroupJep(JEP j) {
super(j);
}
public GroupI getGroup()
{
return group;
}
/**
* Calcuates the value of the expression and returns the
* result as a complex number.
*/
public Complex getComplexValue() {
Object num = this.getValueAsObject();
if(num instanceof Complex) return (Complex) num;
else if(num instanceof HasComplexValueI)
return ((HasComplexValueI) num).getComplexValue();
else if(num instanceof Number)
return new Complex((Number) num);
return super.getComplexValue();
}
/**
* A utility function which returns the complex aproximation of a number.
* @see HasComplexValueI
* @param num the object to be converted
* @return the complex aproximation or null if conversion to complex is not posible.
**/
public static Complex complexValueOf(Object num)
{
if(num instanceof Complex) return (Complex) num;
else if(num instanceof HasComplexValueI)
return ((HasComplexValueI) num).getComplexValue();
else if(num instanceof Number)
return new Complex((Number) num);
else return null;
}
}