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annotate src/org/tmatesoft/hg/internal/FilterByteChannel.java @ 148:1a7a9a20e1f9

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Exceptions, javadoc. Initial cancel and progress support
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 23 Feb 2011 22:36:28 +0100
parents 7567f4a42fe5
children d5268ca7715b
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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19 import java.io.IOException;
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20 import java.nio.ByteBuffer;
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21 import java.util.Collection;
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22
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23 import org.tmatesoft.hg.util.ByteChannel;
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24 import org.tmatesoft.hg.util.CancelledException;
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25
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26 /**
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27 *
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28 * @author Artem Tikhomirov
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29 * @author TMate Software Ltd.
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30 */
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31 public class FilterByteChannel implements ByteChannel {
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32 private final Filter[] filters;
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33 private final ByteChannel delegate;
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34
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35 public FilterByteChannel(ByteChannel delegateChannel, Collection<Filter> filtersToApply) {
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36 if (delegateChannel == null || filtersToApply == null) {
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37 throw new IllegalArgumentException();
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38 }
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39 delegate = delegateChannel;
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40 filters = filtersToApply.toArray(new Filter[filtersToApply.size()]);
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41 }
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43 public int write(ByteBuffer buffer) throws IOException, CancelledException {
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44 final int srcPos = buffer.position();
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45 ByteBuffer processed = buffer;
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46 for (Filter f : filters) {
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47 // each next filter consumes not more than previous
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48 // hence total consumed equals position shift in the original buffer
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49 processed = f.filter(processed);
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50 }
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51 delegate.write(processed);
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52 return buffer.position() - srcPos; // consumed as much from original buffer
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53 }
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54
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55 }