--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/ManifestRevision.java	Fri Aug 12 18:48:57 2011 +0200
@@ -0,0 +1,104 @@
+/*
+ * 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.Collection;
+import java.util.TreeMap;
+
+import org.tmatesoft.hg.core.Nodeid;
+import org.tmatesoft.hg.repo.HgManifest;
+
+/**
+ * Specific revision of the manifest. 
+ * Note, suited to keep single revision only ({@link #changeset()}).
+ *
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public final class ManifestRevision implements HgManifest.Inspector {
+	private final TreeMap<String, Nodeid> idsMap;
+	private final TreeMap<String, String> flagsMap;
+	private final Pool<Nodeid> idsPool;
+	private final Pool<String> namesPool;
+	private Nodeid changeset;
+	private int changelogRev; 
+
+	// optional pools for effective management of nodeids and filenames (they are likely
+	// to be duplicated among different manifest revisions
+	public ManifestRevision(Pool<Nodeid> nodeidPool, Pool<String> filenamePool) {
+		idsPool = nodeidPool;
+		namesPool = filenamePool;
+		idsMap = new TreeMap<String, Nodeid>();
+		flagsMap = new TreeMap<String, String>();
+	}
+	
+	public Collection<String> files() {
+		return idsMap.keySet();
+	}
+
+	public Nodeid nodeid(String fname) {
+		return idsMap.get(fname);
+	}
+
+	public String flags(String fname) {
+		return flagsMap.get(fname);
+	}
+
+	/**
+	 * @return identifier of the changeset this manifest revision corresponds to.
+	 */
+	public Nodeid changeset() {
+		return changeset;
+	}
+	
+	public int changesetLocalRev() {
+		return changelogRev;
+	}
+	
+	//
+
+	public boolean next(Nodeid nid, String fname, String flags) {
+		if (namesPool != null) {
+			fname = namesPool.unify(fname);
+		}
+		if (idsPool != null) {
+			nid = idsPool.unify(nid);
+		}
+		idsMap.put(fname, nid);
+		if (flags != null) {
+			// TreeMap$Entry takes 32 bytes. No reason to keep null for such price
+			// Perhaps, Map<String, Pair<Nodeid, String>> might be better solution
+			flagsMap.put(fname, flags);
+		}
+		return true;
+	}
+
+	public boolean end(int revision) {
+		// in fact, this class cares about single revision
+		return false; 
+	}
+
+	public boolean begin(int revision, Nodeid nid, int changelogRevision) {
+		if (changeset != null) {
+			idsMap.clear();
+			flagsMap.clear();
+		}
+		changeset = nid;
+		changelogRev = changelogRevision;
+		return true;
+	}
+}
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