1 files changed, 57 insertions, 0 deletions
diff --git a/RGens/src/main/java/bjc/rgens/newparser/Rule.java b/RGens/src/main/java/bjc/rgens/newparser/Rule.java
index c479c87..a65f1ce 100644
--- a/RGens/src/main/java/bjc/rgens/newparser/Rule.java
+++ b/RGens/src/main/java/bjc/rgens/newparser/Rule.java
@@ -22,8 +22,17 @@ public class Rule {
 	 * 
 	 * @param ruleName
 	 *                The name of the grammar rule.
+	 * 
+	 * @throws IllegalArgumentException
+	 *                 If the rule name is invalid.
 	 */
 	public Rule(String ruleName) {
+		if(ruleName == null) {
+			throw new NullPointerException("Rule name must not be null");
+		} else if(ruleName.equals("")) {
+			throw new IllegalArgumentException("The empty string is not a valid rule name");
+		}
+
 		this.ruleName = ruleName;
 
 		ruleCases = new FunctionalList<>();
@@ -36,6 +45,10 @@ public class Rule {
 	 *                The case to add.
 	 */
 	public void addCase(RuleCase cse) {
+		if(cse == null) {
+			throw new NullPointerException("Case must not be null");
+		}
+
 		ruleCases.add(cse);
 	}
 
@@ -47,4 +60,48 @@ public class Rule {
 	public RuleCase getCase() {
 		return ruleCases.randItem();
 	}
+
+	/**
+	 * Get all the cases of this rule.
+	 * 
+	 * @return All the cases in this rule.
+	 */
+	public IList<RuleCase> getCases() {
+		return ruleCases;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+
+		int result = 1;
+		result = prime * result + ((ruleCases == null) ? 0 : ruleCases.hashCode());
+		result = prime * result + ((ruleName == null) ? 0 : ruleName.hashCode());
+
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if(this == obj) return true;
+		if(obj == null) return false;
+		if(!(obj instanceof Rule)) return false;
+
+		Rule other = (Rule) obj;
+
+		if(ruleCases == null) {
+			if(other.ruleCases != null) return false;
+		} else if(!ruleCases.equals(other.ruleCases)) return false;
+
+		if(ruleName == null) {
+			if(other.ruleName != null) return false;
+		} else if(!ruleName.equals(other.ruleName)) return false;
+
+		return true;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Rule [ruleName='%s', ruleCases=%s]", ruleName, ruleCases);
+	}
 }
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