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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 expressionType;
/**
* The dice on the left side of the expression
*/
private IDiceExpression leftExpression;
/**
* The dice on the right side of the expression
*/
private IDiceExpression rightExpression;
/**
* 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 type
* The operator to use for combining the dices
*/
public OperatorDiceExpression(IDiceExpression right,
IDiceExpression left, DiceExpressionType type) {
this.rightExpression = right;
this.leftExpression = left;
this.expressionType = type;
}
/*
* (non-Javadoc)
*
* @see bjc.utils.dice.IDiceExpression#roll()
*/
@Override
public int roll() {
/*
* Handle each operator
*/
switch (expressionType) {
case ADD:
return rightExpression.roll() + leftExpression.roll();
case SUBTRACT:
return rightExpression.roll() - leftExpression.roll();
case MULTIPLY:
return rightExpression.roll() * leftExpression.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 rightExpression.roll() / leftExpression.roll();
} catch (ArithmeticException aex) {
UnsupportedOperationException usex = new UnsupportedOperationException(
"Attempted to divide by zero."
+ " Problematic expression is "
+ leftExpression);
usex.initCause(aex);
throw usex;
}
default:
throw new IllegalArgumentException(
"Got passed a invalid ScalarExpressionType ("
+ expressionType + "). WAT");
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "dice-exp[type=" + expressionType + ", l="
+ leftExpression.toString() + ", r="
+ rightExpression.toString() + "]";
}
}
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