--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg4j/src/main/java/org/tmatesoft/hg/internal/Pool.java	Tue May 10 10:52:53 2011 +0200
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2011 TMate Software Ltd
+ *  
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * For information on how to redistribute this software under
+ * the terms of a license other than GNU General Public License
+ * contact TMate Software at support@hg4j.com
+ */
+package org.tmatesoft.hg.internal;
+
+import java.util.HashMap;
+
+/**
+ * Instance pooling.
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class Pool<T> {
+	private final HashMap<T,T> unify = new HashMap<T, T>();
+	
+	public T unify(T t) {
+		T rv = unify.get(t);
+		if (rv == null) {
+			// first time we see a new value
+			unify.put(t, t);
+			rv = t;
+		}
+		return rv;
+	}
+	
+	@Override
+	public String toString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append(Pool.class.getSimpleName());
+		sb.append('<');
+		if (!unify.isEmpty()) {
+			sb.append(unify.keySet().iterator().next().getClass().getName());
+		}
+		sb.append('>');
+		sb.append(':');
+		sb.append(unify.size());
+		return sb.toString();
+	}
+}
\ No newline at end of file