adding HMap#toMap

jnape · jnape · commit 699104092c20 · 2016-11-27T13:19:52.000-06:00
diff --git a/src/main/java/com/jnape/palatable/lambda/adt/hmap/HMap.java b/src/main/java/com/jnape/palatable/lambda/adt/hmap/HMap.java
@@ -125,6 +125,16 @@ public Iterable<Object> values() {
         return map(Tuple2::_2, this);
     }
 
+    /**
+     * Return a standard {@link Map} view of the current snapshot of this {@link HMap}. Note that updates to either the
+     * {@link Map} view or to the original {@link HMap} do not propagate to the other.
+     *
+     * @return the map view
+     */
+    public Map<TypeSafeKey, Object> toMap() {
+        return new HashMap<>(table);
+    }
+
     @Override
     public Iterator<Tuple2<TypeSafeKey, Object>> iterator() {
         return map(Tuple2::fromEntry, table.entrySet()).iterator();
diff --git a/src/test/java/com/jnape/palatable/lambda/adt/hmap/HMapTest.java b/src/test/java/com/jnape/palatable/lambda/adt/hmap/HMapTest.java
@@ -2,6 +2,7 @@
 
 import org.junit.Test;
 
+import java.util.HashMap;
 import java.util.NoSuchElementException;
 import java.util.Optional;
 
@@ -128,6 +129,18 @@ public void demandForAbsentKey() {
         emptyHMap().demand(typeSafeKey());
     }
 
+    @Test
+    public void toMap() {
+        TypeSafeKey<String> stringKey = typeSafeKey();
+        TypeSafeKey<Integer> intKey = typeSafeKey();
+
+        assertEquals(new HashMap<TypeSafeKey, Object>() {{
+            put(stringKey, "string");
+            put(intKey, 1);
+        }}, hMap(stringKey, "string",
+                 intKey, 1).toMap());
+    }
+
     @Test
     public void iteratesKVPairsAsTuples() {
         TypeSafeKey<String> stringKey = typeSafeKey();
