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package symjava.symbolic.utils;

import java.util.ArrayList;

import symjava.symbolic.Expr;

import symjava.symbolic.Negate;

public class MulList extends ArrayList<Expr>{

private static final long serialVersionUID = 1L;

int sign = 1;

public MulList() {

}

/**

* Flatten the expr to a multiply list

* @param expr

*/

public MulList(Expr expr) {

expr.flattenMultiply(this);

sign = getGlobalSign();

}

boolean isNegative() {

return sign == -1;

}

public int getGlobalSign() {

int count = 0;

for(Expr e : this) {

if(e instanceof Negate) {

count++;

}

}

if(count%2==1)

return -1;

return 1;

}

/**

* Convert the list back to an expr

* @return

*/

public Expr toExpr() {

return Utils.multiplyListToExpr(this);

}

}