--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/FNCacheFile.java	Wed Feb 13 18:44:58 2013 +0100
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013 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.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+
+import org.tmatesoft.hg.util.Path;
+
+/**
+ * <blockquote>
+ * The fncache file contains the paths of all filelog files in the store as encoded by mercurial.filelog.encodedir. The paths are separated by '\n' (LF).
+ * </blockquote>
+ * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class FNCacheFile {
+	
+	private final Internals repo;
+	private final ArrayList<Path> files;
+
+	public FNCacheFile(Internals internalRepo) {
+		repo = internalRepo;
+		files = new ArrayList<Path>();
+	}
+
+	public void read(Path.Source pathFactory) throws IOException {
+		File f = fncacheFile();
+		files.clear();
+		if (!f.exists()) {
+			return;
+		}
+		ArrayList<String> entries = new ArrayList<String>();
+		// names in fncache are in local encoding, shall translate to unicode
+		new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
+		for (String e : entries) {
+			files.add(pathFactory.path(e));
+		}
+	}
+	
+	public void write() throws IOException {
+		if (files.isEmpty()) {
+			return;
+		}
+		File f = fncacheFile();
+		f.getParentFile().mkdirs();
+		final Charset filenameEncoding = repo.getFilenameEncoding();
+		FileOutputStream fncacheFile = new FileOutputStream(f);
+		for (Path p : files) {
+			String s = "data/" + p.toString() + ".i"; // TODO post-1.0 this is plain wrong. (a) likely need .d files, too; (b) what about dh/ location? 
+			fncacheFile.write(s.getBytes(filenameEncoding));
+			fncacheFile.write(0x0A); // http://mercurial.selenic.com/wiki/fncacheRepoFormat
+		}
+		fncacheFile.close();
+	}
+
+	public void add(Path p) {
+		files.add(p);
+	}
+
+	private File fncacheFile() {
+		return repo.getFileFromStoreDir("fncache");
+	}
+}