1 files changed, 37 insertions, 0 deletions
diff --git a/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/DoubleKeyCache.java b/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/DoubleKeyCache.java
new file mode 100644
index 00000000..e1910f3f
--- /dev/null
+++ b/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/DoubleKeyCache.java
@@ -0,0 +1,37 @@
+/*******************************************************************************
+ * Copyright (c) 2005, 2006 committers of openArchitectureWare and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     committers of openArchitectureWare - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.internal.xtend.util;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+public abstract class DoubleKeyCache<K1, K2, V> {
+
+    protected abstract V createNew(K1 key1, K2 key2);
+
+    private final Map <Pair <K1, K2>, V> internal = new HashMap <Pair <K1, K2>, V>();
+
+    public V get (K1 key1, K2 key2) {
+        final Pair<K1, K2> key = new Pair <K1, K2> (key1, key2);
+        
+        if (internal.containsKey (key))
+            return internal.get (key);
+        final V r = createNew (key1, key2);
+        internal.put(key, r);
+        return r;
+    }
+
+    public Collection<V> getValues() {
+        return internal.values();
+    }
+
+}