--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/internal/FilterByteChannel.java	Thu Feb 03 23:32:08 2011 +0100
@@ -0,0 +1,53 @@
+/*
+ * 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@svnkit.com
+ */
+package org.tmatesoft.hg.internal;
+
+import java.nio.ByteBuffer;
+import java.util.Collection;
+
+import org.tmatesoft.hg.util.ByteChannel;
+
+/**
+ *
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class FilterByteChannel implements ByteChannel {
+	private final Filter[] filters;
+	private final ByteChannel delegate;
+	
+	public FilterByteChannel(ByteChannel delegateChannel, Collection<Filter> filtersToApply) {
+		if (delegateChannel == null || filtersToApply == null) {
+			throw new IllegalArgumentException();
+		}
+		delegate = delegateChannel;
+		filters = filtersToApply.toArray(new Filter[filtersToApply.size()]);
+	}
+
+	public int write(ByteBuffer buffer) throws Exception {
+		final int srcPos = buffer.position();
+		ByteBuffer processed = buffer;
+		for (Filter f : filters) {
+			// each next filter consumes not more than previous
+			// hence total consumed equals position shift in the original buffer
+			processed = f.filter(processed);
+		}
+		delegate.write(processed);
+		return buffer.position() - srcPos; // consumed as much from original buffer
+	}
+
+}