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package bjc.utils.dice;
/**
* Implements a class for combining two dice with an operator
*
* @author ben
*
*/
public class CompoundDiceExpression implements IDiceExpression {
/**
* The operator to use for combining the dice
*/
private DiceExpressionType det;
/**
* The dice on the left side of the expression
*/
private IDiceExpression left;
/**
* The dice on the right side of the expression
*/
private IDiceExpression right;
/**
* Create a new compound expression using the specified parameters
*
* @param right
* The die on the right side of the expression
* @param left
* The die on the left side of the expression
* @param det
* The operator to use for combining the dices
*/
public CompoundDiceExpression(IDiceExpression right,
IDiceExpression left, DiceExpressionType det) {
this.right = right;
this.left = left;
this.det = det;
}
@Override
public int roll() {
/*
* Handle each operator
*/
switch (det) {
case ADD:
return right.roll() + left.roll();
case SUBTRACT:
return right.roll() - left.roll();
case MULTIPLY:
return right.roll() * left.roll();
case DIVIDE:
/*
* Round to keep results as integers.
* We don't really have any need for floating-point dice
*/
return Math.round(right.roll() / left.roll());
default:
throw new IllegalStateException(
"Got passed a invalid ScalarExpressionType "
+ det + ". WAT");
}
}
}
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