1 files changed, 36 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/mammoth/internal/util/Sets.java b/src/main/java/org/zwobble/mammoth/internal/util/Sets.java
new file mode 100644
index 0000000..c979740
--- /dev/null
+++ b/src/main/java/org/zwobble/mammoth/internal/util/Sets.java
@@ -0,0 +1,36 @@
+package org.zwobble.mammoth.internal.util;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static java.util.Arrays.asList;
+import static org.zwobble.mammoth.internal.util.Iterables.stream;
+
+public class Sets {
+    public static <T> Set<T> set() {
+        return Collections.emptySet();
+    }
+
+    public static <T> Set<T> set(T value1) {
+        return Collections.singleton(value1);
+    }
+
+    @SafeVarargs
+    public static <T> Set<T> set(T... values) {
+        HashSet<T> set = new HashSet<>();
+        set.addAll(asList(values));
+        return set;
+    }
+
+    public static <T> Set<T> difference(Set<? extends T> set1, Set<? extends T> set2) {
+        HashSet<T> result = new HashSet<>(set1);
+        result.removeAll(set2);
+        return result;
+    }
+
+    public static <T> Set<T> toSet(Iterable<T> iterable) {
+        return stream(iterable).collect(Collectors.toSet());
+    }
+}