feat: add custom Exceptions

src/main/java/fr/mieuxvoter/mj/IncoherentTallyException.java

@@ -0,0 +1,26 @@
+package fr.mieuxvoter.mj;
+
+/**
+ * Raised when the provided tally holds negative values, or infinity.
+ */
+class IncoherentTallyException extends InvalidTallyException {
+
+	private static final long serialVersionUID = 5858986651601202903L;
+
+	@Override
+	public String getMessage() {
+		return (
+				"The provided tally holds negative values, or infinity. "
+				+
+				(null == super.getMessage() ? "" : super.getMessage())
+		);
+	}
+
+	@Override
+	public String getLocalizedMessage() {
+		return super.getLocalizedMessage();
+	}
+	
+	
+
+}

src/main/java/fr/mieuxvoter/mj/InvalidTallyException.java

@@ -0,0 +1,12 @@
+package fr.mieuxvoter.mj;
+
+import java.security.InvalidParameterException;
+
+/**
+ * Raised when the provided tally is invalid.
+ */
+class InvalidTallyException extends InvalidParameterException {
+
+	private static final long serialVersionUID = 3033391835216704620L;
+
+}

src/main/java/fr/mieuxvoter/mj/UnbalancedTallyException.java

@@ -0,0 +1,21 @@
+package fr.mieuxvoter.mj;
+
+/**
+ * Raised when the provided tally does not hold the same amount of judgments
+ * for each proposal, and normalization is required.
+ */
+class UnbalancedTallyException extends InvalidTallyException {
+
+	private static final long serialVersionUID = 5041093000505081735L;
+	
+	@Override
+	public String getMessage() {
+		return (
+				"The provided tally is unbalanced, " +
+				"as some proposals received more judgments than others. \n" +
+				"You need to set a strategy for balancing tallies. To that effect, \n" +
+				"you may use StaticDefaultTally, MedianDefaultTally, or NormalizedTally instead of Tally. \n" +
+				(null == super.getMessage() ? "" : super.getMessage())
+		);
+	}
+}