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, 82 insertions, 0 deletions

diff --git a/dice/src/main/java/bjc/dicelang/neodice/DiePoolFactory.java b/dice/src/main/java/bjc/dicelang/neodice/DiePoolFactory.java
new file mode 100644
index 0000000..6d9314d
--- /dev/null
+++ b/dice/src/main/java/bjc/dicelang/neodice/DiePoolFactory.java
@@ -0,0 +1,82 @@
+package bjc.dicelang.neodice;
+
+import java.util.*;
+
+/**
+ * Various static functions which create instances of DiePool.
+ * 
+ * @author Ben Culkin
+ *
+ */
+public class DiePoolFactory {
+	/**
+	 * Create a die pool containing the provided dice.
+	 * 
+	 * @param dice The dice to put into the pool.
+	 * 
+	 * @return A pool which contains the provided dice.
+	 */
+	public static DiePool containing(Die... dice) {
+		return new FixedDiePool(dice);
+	}
+}
+
+final class FixedDiePool implements DiePool {
+	private final Die[] dice;
+
+	public FixedDiePool(Die[] dice) {
+		this.dice = dice;
+	}
+
+	@Override
+	public int[] roll(Random rng) {
+		int[] results = new int[dice.length];
+		
+		for (int index = 0; index < dice.length; index++) {
+			results[index] = dice[index].roll(rng);
+		}
+		
+		return results;
+	}
+
+	@Override
+	public Die[] contained() {
+		return dice;
+	}
+
+	
+	@Override
+	public String toString() {
+		StringBuilder builder = new StringBuilder();
+		
+		for (int i = 0; i < dice.length; i++) {
+			Die die = dice[i];
+			
+			builder.append(die);
+			
+			// Don't add an extra trailing comma
+			if (i < dice.length - 1) builder.append(", ");
+		}
+		
+		return builder.toString();
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + Arrays.hashCode(dice);
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)                  return true;
+		if (obj == null)                  return false;
+		if (getClass() != obj.getClass()) return false;
+		
+		FixedDiePool other = (FixedDiePool) obj;
+		
+		return Arrays.equals(dice, other.dice);
+	}
+}
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