--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/SubrepoManager.java	Thu Jun 16 04:23:51 2011 +0200
@@ -0,0 +1,129 @@
+/*
+ * 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.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
+import org.tmatesoft.hg.repo.HgRepository;
+import org.tmatesoft.hg.repo.HgSubrepoLocation;
+
+/**
+ * 
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class SubrepoManager /* XXX RepoChangeNotifier, RepoChangeListener */{
+
+	private final HgRepository repo;
+	private List<HgSubrepoLocation> subRepos;
+
+	public SubrepoManager(HgRepository hgRepo) {
+		assert hgRepo != null;
+		repo = hgRepo;
+	}
+
+	private List<HgSubrepoLocation> readActualState() {
+		File hgsubFile = new File(repo.getWorkingDir(), ".hgsub");
+		if (!hgsubFile.canRead()) {
+			return Collections.emptyList();
+		}
+		try {
+			Map<String, String> state; // path -> revision
+			File hgstateFile = new File(repo.getWorkingDir(), ".hgsubstate");
+			if (hgstateFile.canRead()) {
+				state = readState(new BufferedReader(new FileReader(hgstateFile)));
+			} else {
+				state = Collections.emptyMap();
+			}
+			BufferedReader br = new BufferedReader(new FileReader(hgsubFile));
+			return readConfig(br, state);
+		} catch (IOException ex) {
+			ex.printStackTrace(); // XXX log. Generally, shall not happen
+		}
+		return Collections.emptyList();
+	}
+
+	private List<HgSubrepoLocation> readConfig(BufferedReader br, Map<String, String> substate) throws IOException {
+		try {
+			String line;
+			LinkedList<HgSubrepoLocation> res = new LinkedList<HgSubrepoLocation>();
+			while ((line = br.readLine()) != null) {
+				int sep = line.indexOf('=');
+				if (sep == -1) {
+					continue;
+				}
+				// since both key and value are referenced from HgSubrepoLocation, doesn't make sense
+				// to have separate String instances (new String(line.substring()))
+				String key = line.substring(0, sep).trim();
+				String value = line.substring(sep + 1).trim();
+				if (value.length() == 0) {
+					// XXX log bad line?
+					continue;
+				}
+				HgSubrepoLocation.Kind kind = HgSubrepoLocation.Kind.Hg;
+				int kindEnd = value.indexOf(']', 1);
+				if (value.charAt(0) == '[' && kindEnd != -1) {
+					String kindStr = value.substring(1, kindEnd);
+					value = value.substring(kindEnd + 1);
+					if ("svn".equals(kindStr)) {
+						kind = HgSubrepoLocation.Kind.SVN;
+					} else if ("git".equals(kindStr)) {
+						kind = HgSubrepoLocation.Kind.Git;
+					}
+				}
+				// TODO respect paths mappings in config file
+				HgSubrepoLocation loc = new HgSubrepoLocation(repo, key, value, kind, substate.get(key));
+				res.add(loc);
+			}
+			return Arrays.asList(res.toArray(new HgSubrepoLocation[res.size()]));
+		} finally {
+			br.close();
+		}
+	}
+
+	private Map<String, String> readState(BufferedReader br) throws IOException {
+		HashMap<String, String> rv = new HashMap<String, String>();
+		try {
+			String line;
+			while ((line = br.readLine()) != null) {
+				int sep = line.trim().indexOf(' ');
+				if (sep != -1) {
+					rv.put(line.substring(sep+1).trim(), line.substring(0, sep).trim());
+				}
+			}
+		} finally {
+			br.close();
+		}
+		return rv;
+	}
+
+	public List<HgSubrepoLocation> all(/*int revision, or TIP|WC*/) {
+		if (subRepos == null) {
+			subRepos = readActualState();
+		}
+		return subRepos;
+	}
+}