Begin new dice implementation

For various reasons, I'm not happy with the other implementations.
Here's hoping that this one is better

1 files changed, 63 insertions, 0 deletions

diff --git a/dice/src/main/java/bjc/dicelang/neodice/DieFactory.java b/dice/src/main/java/bjc/dicelang/neodice/DieFactory.java
new file mode 100644
index 0000000..d9bae7e
--- /dev/null
+++ b/dice/src/main/java/bjc/dicelang/neodice/DieFactory.java
@@ -0,0 +1,63 @@
+package bjc.dicelang.neodice;
+
+import java.util.*;
+
+/**
+ * Various static functions which create instances of Die.
+ * 
+ * @author Ben Culkin
+ *
+ */
+public class DieFactory {
+	/**
+	 * Create a simple polyhedral die with a fixed number of sides.
+	 * 
+	 * @param sides The number of sides for the die.
+	 * 
+	 * @return A die which returns a result from 1 to sides.
+	 */
+	public static Die polyhedral(int sides) {
+		return new PolyhedralDie(sides);
+	}
+}
+
+final class PolyhedralDie implements Die {
+	private final int sides;
+
+	public PolyhedralDie(int sides) {
+		this.sides = sides;
+	}
+
+	@Override
+	public int roll(Random rng) {
+		// Dice are one-based, not zero-based.
+		return rng.nextInt(sides) + 1;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("d%d", sides);
+	}
+	
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + sides;		
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)                  return true;
+		if (obj == null)                  return false;
+		if (getClass() != obj.getClass()) return false;
+		
+		PolyhedralDie other = (PolyhedralDie) obj;
+		
+		if (sides != other.sides) return false;
+		else                      return true;
+	}
+	
+	
+}
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