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