#1211 - ENH: Support L2 cache complex natural keys include findList() queries

src/main/java/io/ebeaninternal/api/NaturalKeySet.java

@@ -0,0 +1,31 @@
+package io.ebeaninternal.api;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class NaturalKeySet {
+
+
+  private final Map<Object, NaturalKeyEntry> map = new LinkedHashMap<>();
+
+  public NaturalKeySet() {
+  }
+
+  public int size() {
+    return map.size();
+  }
+
+  public void add(NaturalKeyEntry entry) {
+    map.put(entry.key(), entry);
+  }
+
+  public Set<Object> keys() {
+    return map.keySet();
+  }
+
+  public Object getInValue(Object naturalKey) {
+    NaturalKeyEntry entry = map.get(naturalKey);
+    return entry.getInValue();
+  }
+}