From d299b608799b3b722e97ba0b3f41edb122dc4786 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Wed, 30 Mar 2016 14:27:25 +0100
Subject: Remove duplicates when finding captured variables

---
 .../zwobble/couscous/util/InsertionOrderSet.java   | 27 ++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 src/main/java/org/zwobble/couscous/util/InsertionOrderSet.java

(limited to 'src/main/java/org/zwobble/couscous/util/InsertionOrderSet.java')

diff --git a/src/main/java/org/zwobble/couscous/util/InsertionOrderSet.java b/src/main/java/org/zwobble/couscous/util/InsertionOrderSet.java
new file mode 100644
index 0000000..4272add
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/util/InsertionOrderSet.java
@@ -0,0 +1,27 @@
+package org.zwobble.couscous.util;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
+
+public interface InsertionOrderSet<T> extends Iterable<T> {
+    static <T> InsertionOrderSet<T> copyOf(Iterable<T> iterable) {
+        List<T> list = StreamSupport.stream(iterable.spliterator(), false)
+            .distinct()
+            .collect(Collectors.toList());
+        return new InsertionOrderSet<T>() {
+            @Override
+            public List<T> asList() {
+                return list;
+            }
+
+            @Override
+            public Iterator<T> iterator() {
+                return list.iterator();
+            }
+        };
+    }
+
+    List<T> asList();
+}
-- 
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