--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg4j/src/main/java/org/tmatesoft/hg/util/Path.java	Tue May 10 10:52:53 2011 +0200
@@ -0,0 +1,121 @@
+/*
+ * 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;
+
+/**
+ * Identify repository files (not String nor io.File). Convenient for pattern matching. Memory-friendly.
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public final class Path implements CharSequence, Comparable<Path>/*Cloneable? - although clone for paths make no sense*/{
+//	private String[] segments;
+//	private int flags; // dir, unparsed
+	private String path;
+	
+	/*package-local*/Path(String p) {
+		path = p;
+	}
+
+	/**
+	 * Check if this is directory's path. 
+	 * Note, this method doesn't perform any file system operation.
+	 * 
+	 * @return true when this path points to a directory 
+	 */
+	public boolean isDirectory() {
+		// XXX simple logic for now. Later we may decide to have an explicit factory method to create directory paths
+		return path.charAt(path.length() - 1) == '/';
+	}
+
+	public int length() {
+		return path.length();
+	}
+
+	public char charAt(int index) {
+		return path.charAt(index);
+	}
+
+	public CharSequence subSequence(int start, int end) {
+		// new Path if start-end matches boundaries of any subpath
+		return path.substring(start, end);
+	}
+	
+	@Override
+	public String toString() {
+		return path; // CharSequence demands toString() impl
+	}
+
+	public int compareTo(Path o) {
+		return path.compareTo(o.path);
+	}
+	
+	@Override
+	public boolean equals(Object obj) {
+		if (obj != null && getClass() == obj.getClass()) {
+			return this == obj || path.equals(((Path) obj).path);
+		}
+		return false;
+	}
+	@Override
+	public int hashCode() {
+		return path.hashCode();
+	}
+
+	public static Path create(String path) {
+		if (path == null) {
+			throw new IllegalArgumentException();
+		}
+		if (path.indexOf('\\') != -1) {
+			throw new IllegalArgumentException();
+		}
+		Path rv = new Path(path);
+		return rv;
+	}
+
+	/**
+	 * Path filter.
+	 */
+	public interface Matcher {
+		boolean accept(Path path);
+	}
+
+	/**
+	 * Factory for paths
+	 */
+	public interface Source {
+		Path path(String p);
+	}
+
+	/**
+	 * Straightforward {@link Source} implementation that creates new Path instance for each supplied string
+	 */
+	public static class SimpleSource implements Source {
+		private final PathRewrite normalizer;
+
+		public SimpleSource(PathRewrite pathRewrite) {
+			if (pathRewrite == null) {
+				throw new IllegalArgumentException();
+			}
+			normalizer = pathRewrite;
+		}
+
+		public Path path(String p) {
+			return Path.create(normalizer.rewrite(p));
+		}
+	}
+}