--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg4j/src/main/java/org/tmatesoft/hg/util/PathRewrite.java	Tue May 10 10:52:53 2011 +0200
@@ -0,0 +1,61 @@
+/*
+ * 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.util;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * File names often need transformations, like Windows-style path to Unix or human-readable data file name to storage location.  
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public interface PathRewrite {
+
+	// XXX think over CharSequence use instead of String
+	public String rewrite(String path);
+	
+	public static class Empty implements PathRewrite {
+		public String rewrite(String path) {
+			return path;
+		}
+	}
+
+	public class Composite implements PathRewrite {
+		private List<PathRewrite> chain;
+
+		public Composite(PathRewrite... e) {
+			LinkedList<PathRewrite> r = new LinkedList<PathRewrite>();
+			for (int i = 0; e != null && i < e.length; i++) {
+				r.addLast(e[i]);
+			}
+			chain = r;
+		}
+		public Composite chain(PathRewrite e) {
+			chain.add(e);
+			return this;
+		}
+
+		public String rewrite(String path) {
+			for (PathRewrite pr : chain) {
+				path = pr.rewrite(path);
+			}
+			return path;
+		}
+	}
+}