--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hg4j/src/main/java/org/tmatesoft/hg/internal/Filter.java	Tue May 10 10:52:53 2011 +0200
@@ -0,0 +1,57 @@
+/*
+ * 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.nio.ByteBuffer;
+
+import org.tmatesoft.hg.repo.HgRepository;
+import org.tmatesoft.hg.util.Path;
+
+/**
+ *
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public interface Filter {
+
+	// returns a buffer ready to be read. may return original buffer.
+	// original buffer may not be fully consumed, #compact() might be operation to perform 
+	ByteBuffer filter(ByteBuffer src);
+
+	interface Factory {
+		void initialize(HgRepository hgRepo, ConfigFile cfg);
+		// may return null if for a given path and/or options this filter doesn't make any sense
+		Filter create(Path path, Options opts);
+	}
+
+	enum Direction {
+		FromRepo, ToRepo
+	}
+
+	public class Options {
+
+		private final Direction direction;
+		public Options(Direction dir) {
+			direction = dir;
+		}
+		
+		Direction getDirection() {
+			return direction;
+		}
+
+	}
+}