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package bjc.dicelang;
/**
* A dice expression that combines a scalar and a dice
*
* @author ben
*
*/
public class ScalarDiceExpression implements IDiceExpression {
/**
* The operation to combine with
*/
private DiceExpressionType det;
/**
* The expression to be combined
*/
private IDiceExpression exp;
/**
* The scalar to be combined
*/
private int scalar;
/**
* Create a dice expression with a scalar
*
* @param dex
* The dice to use
* @param scalr
* The scalar to use
* @param dt
* The operation to combine with
*/
public ScalarDiceExpression(IDiceExpression dex, int scalr,
DiceExpressionType dt) {
exp = dex;
scalar = scalr;
det = dt;
}
/*
* (non-Javadoc)
*
* @see bjc.utils.dice.IDiceExpression#roll()
*/
@Override
public int roll() {
switch (det) {
case ADD:
return exp.roll() + scalar;
case SUBTRACT:
return exp.roll() - scalar;
case MULTIPLY:
return exp.roll() * scalar;
case DIVIDE:
try {
return exp.roll() / scalar;
} catch (ArithmeticException aex) {
throw new UnsupportedOperationException(
"Attempted to divide by zero.");
}
default:
throw new IllegalStateException(
"Got passed a invalid ScalarExpressionType "
+ det);
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "scalar-exp[type=" + det + ", l=" + scalar + ", r="
+ exp.toString() + "]";
}
}
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