1 files changed, 17 insertions, 16 deletions
diff --git a/src/main/java/sevenUnitsGUI/PrefixSearchRule.java b/src/main/java/sevenUnitsGUI/PrefixSearchRule.java
index 87f14a8..a62ccda 100644
--- a/src/main/java/sevenUnitsGUI/PrefixSearchRule.java
+++ b/src/main/java/sevenUnitsGUI/PrefixSearchRule.java
@@ -99,18 +99,19 @@ public final class PrefixSearchRule implements
 	/**
 	 * Determines which units are given prefixes.
 	 */
-	private final Predicate<LinearUnit> allowUnit;
+	private final Predicate<LinearUnit> prefixableUnitRule;
 	
 	/**
-	 * @param prefixes
-	 * @param metricOnly
+	 * @param prefixes           prefixes to add to units
+	 * @param prefixableUnitRule function that determines which units get
+	 *                           prefixes
 	 * @since v0.4.0
 	 * @since 2022-07-06
 	 */
 	public PrefixSearchRule(Set<UnitPrefix> prefixes,
-			Predicate<LinearUnit> allowUnit) {
+			Predicate<LinearUnit> prefixableUnitRule) {
 		this.prefixes = Collections.unmodifiableSet(new HashSet<>(prefixes));
-		this.allowUnit = allowUnit;
+		this.prefixableUnitRule = prefixableUnitRule;
 	}
 	
 	@Override
@@ -119,13 +120,13 @@ public final class PrefixSearchRule implements
 		final String originalName = t.getKey();
 		final LinearUnit originalUnit = t.getValue();
 		outputUnits.put(originalName, originalUnit);
-		if (this.allowUnit.test(originalUnit)) {
+		if (this.prefixableUnitRule.test(originalUnit)) {
 			for (final UnitPrefix prefix : this.prefixes) {
 				outputUnits.put(prefix.getName() + originalName,
 						originalUnit.withPrefix(prefix));
 			}
 		}
-		return outputUnits;
+		return Collections.unmodifiableMap(outputUnits);
 	}
 	
 	@Override
@@ -135,10 +136,10 @@ public final class PrefixSearchRule implements
 		if (!(obj instanceof PrefixSearchRule))
 			return false;
 		final PrefixSearchRule other = (PrefixSearchRule) obj;
-		if (this.allowUnit == null) {
-			if (other.allowUnit != null)
+		if (this.prefixableUnitRule == null) {
+			if (other.prefixableUnitRule != null)
 				return false;
-		} else if (!this.allowUnit.equals(other.allowUnit))
+		} else if (!this.prefixableUnitRule.equals(other.prefixableUnitRule))
 			return false;
 		if (this.prefixes == null) {
 			if (other.prefixes != null)
@@ -149,12 +150,12 @@ public final class PrefixSearchRule implements
 	}
 	
 	/**
-	 * @return the allowUnit
+	 * @return rule that determines which units get prefixes
 	 * @since v0.4.0
-	 * @since 2022-07-06
+	 * @since 2022-07-09
 	 */
-	public Predicate<LinearUnit> getAllowUnit() {
-		return this.allowUnit;
+	public Predicate<LinearUnit> getPrefixableUnitRule() {
+		return this.prefixableUnitRule;
 	}
 	
 	/**
@@ -170,8 +171,8 @@ public final class PrefixSearchRule implements
 	public int hashCode() {
 		final int prime = 31;
 		int result = 1;
-		result = prime * result
-				+ (this.allowUnit == null ? 0 : this.allowUnit.hashCode());
+		result = prime * result + (this.prefixableUnitRule == null ? 0
+				: this.prefixableUnitRule.hashCode());
 		result = prime * result
 				+ (this.prefixes == null ? 0 : this.prefixes.hashCode());
 		return result;