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package bjc.dicelang;
/**
* Implements a class for combining two dice with an operator
*
* @author ben
*
*/
public class OperatorDiceExpression implements IDiceExpression {
/*
* The operator to use for combining the dice
*/
private DiceExpressionType type;
/*
* 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 rght
* The die on the right side of the expression
* @param lft
* The die on the left side of the expression
* @param type
* The operator to use for combining the dices
*/
public OperatorDiceExpression(IDiceExpression rght,
IDiceExpression lft, DiceExpressionType type) {
this.right = rght;
this.left = lft;
this.type = type;
}
@Override
public int roll() {
/*
* Handle each operator
*/
switch (type) {
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, and continuous
* probability is a pain
*/
try {
return right.roll() / left.roll();
} catch (ArithmeticException aex) {
UnsupportedOperationException usex = new UnsupportedOperationException(
"Attempted to divide by zero."
+ " Problematic expression is "
+ left);
usex.initCause(aex);
throw usex;
}
default:
throw new IllegalArgumentException(
"Got passed a invalid ScalarExpressionType ("
+ type + "). WAT");
}
}
@Override
public String toString() {
return "dice-exp[type=" + type + ", l="
+ left.toString() + ", r="
+ right.toString() + "]";
}
}
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