Moved examples

1 files changed, 96 insertions, 0 deletions

diff --git a/dice-lang/src/bjc/dicelang/OperatorDiceExpression.java b/dice-lang/src/bjc/dicelang/OperatorDiceExpression.java
new file mode 100644
index 0000000..f86773d
--- /dev/null
+++ b/dice-lang/src/bjc/dicelang/OperatorDiceExpression.java
@@ -0,0 +1,96 @@
+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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