Mercurial > hg4j
view src/org/tmatesoft/hg/internal/FilterByteChannel.java @ 115:c0cc2535462c
Introduced channels to pipeline (and easily filter) data streams
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 03 Feb 2011 23:32:08 +0100 |
parents | |
children | 7567f4a42fe5 |
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/* * 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 } }